Year: 2024

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 Density Meter Comprehensive Guide: Operating Principles, Brands,Usage, Faults, and Maintenance

Density Meter Overview

The Density Meter is a precision instrument used to measure the density of objects. It finds wide application in laboratories, industrial production, and scientific research. By measuring the mass and volume of an object, it calculates density based on the definition of mass-to-volume ratio. Capable of measuring both solid and liquid densities, the density meter offers speed, accuracy, and ease of operation.

Principles

The fundamental principle of the density meter is based on Archimedes’ Principle, which states that the buoyant force on an object in a fluid is equal to the weight of the fluid it displaces. According to this principle, density meters are designed to float in liquids and indirectly measure liquid density by assessing the relationship between buoyancy and gravity. Various types of density meters, such as oscillating tube, hydrostatic, and radioactive isotope meters, may employ different working principles, but the core idea involves inferring density by measuring the force state of an object in a liquid.

Usage

Preparation:

  • Ensure the density meter is fully powered and its indication range and accuracy meet measurement requirements.
  • Clean the measurement container to ensure no impurities.

Measurement Steps:

  1. Determine Object Mass: Use a balance to measure and record the mass of the object to be tested.
  2. Place Measurement Container: Select a suitable measurement container, place it on the density meter platform, and eliminate bubbles.
  3. Fill Liquid: Slowly pour in the liquid to be measured until the surface is stable.
  4. Place Object: Gently place the object in the container, keeping it suspended and avoiding contact with the container walls.
  5. Read Measurement: Wait for the density meter to stabilize and read the density value on the display.

Common Faults and Repairs

Power Fault:

  • Phenomenon: Unable to start normally or sudden power-off, display shows nothing or abnormally.
  • Repair: Check power cord connection, replace power socket or cord. Ensure stable power supply and avoid excessive voltage fluctuations. For internal power module faults, contact the manufacturer or professional repair personnel.

Display Fault:

  • Phenomenon: Display shows garbled characters, no display, or unclear display.
  • Repair: Gently wipe the display to remove stains. If the problem persists, try restarting the density meter or contact the manufacturer for repair.

Sensor Fault:

  • Phenomenon: Measurement results are inaccurate or abnormal.
  • Repair: Clean the sensor to remove stains. If the sensor is damaged, replace it. For sensor calibration errors, recalibrate according to the manual or contact the manufacturer.

Connection Line Fault:

  • Phenomenon: Unstable or unable to connect the density meter to a computer or other devices.
  • Repair: Check if the connection plug is tightly inserted and replace damaged connection lines.

Temperature Drift:

  • Phenomenon: Measurement results are unstable or have large deviations at different temperatures.
  • Repair: Check the working environment temperature and avoid excessively high or low temperatures. For temperature drift issues, contact the manufacturer for repair or replace with a suitable density meter.

Leakage:

  • Phenomenon: The density meter leaks, resulting in poor measurement repeatability.
  • Repair: Inspect and replace damaged seals. Ensure proper sample handling, eliminate bubbles and suspended particles before measurement.

Maintenance and Care

  • Regular Inspection: After a period of use, check the accuracy of measurement results.
  • Regular Calibration: Perform regular calibration according to manual requirements to maintain the accuracy and stability of the density meter.
  • Cleaning: Clean containers and measurement components before and after use to avoid contamination.
  • Avoid Collision and Dropping: As a precision instrument, the density meter should be protected from collisions and drops.

Summary of Repaired Density Meter Brands and Models by Longi Electromechanical

  1. Anton Paar
    • DMA Series: DMA 35, DMA 1001, DMA 4101, DMA 4501, DMA 5000 M
  2. Mettler Toledo
    • D Series: DM40, DM45, DE45
  3. Rudolph Research Analytical
    • D Series: DDM 2910, DDM 2911, DDM 2911 Plus, DDM 2911 LAB
  4. Kyoto Electronics Manufacturing (KEM)
    • DA Series: DA-130N, DA-155N, DA-650, DA-640, DA-645, DA-860
  5. Emerson
    • Micro Motion Series: Micro Motion ELITE CMFS010M, CMFS015M, CMFS025M
  6. Thermo Fisher Scientific
    • D Series: Densito 30PX, Densito 30PXU
  7. KEM
    • DA Series: DA-130N, DA-155N, DA-500
  8. DMA Lab
    • L Series: L100, L100i, L200
  9. LAUDA Scientific
    • iVisc: High-precision Density Meter
  10. Endress+Hauser
    • Liquiphant Series: FTL31, FTL33, FTL51
  11. Yokogawa
    • DM8: Fixed Density Meter
  12. KROHNE
    • Optisys Series: Optisys MCM2000, Optisys MCM1000
  13. Hach
    • Density Meter Series: 2100Q, 2100AN
  14. A&D
    • AD Series: AD-4212B, AD-4212C, AD-4212D
  15. Bopp & Reuther
    • Density Meter Series: DVO-68, DVO-69

With nearly 30 years of experience in repairing density meters, Longi Electromechanical can quickly repair various instruments. Additionally, we offer recycling and sales of various density meters. Welcome to consult.

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Comprehensive Analysis and Repair Guide for Potentiometric Titration Systems

I. Overview of Potentiometric Titration System

The potentiometric titration system is a widely used analytical instrument in fields such as chemistry, environmental protection, food, and pharmaceuticals. It observes and measures changes in the potential of a solution under test to determine the endpoint of titration analysis and perform quantitative analysis. The system consists of an indicator electrode and a reference electrode, forming a working cell that monitors potential changes during the titration process to accurately calculate the content of the component being tested.

II. Principle of Potentiometric Titration System

The basic principle of the potentiometric titration system is based on electrochemistry. In the titration solution, an indicator electrode and a reference electrode are inserted to form a working cell. As the titrant is gradually added, a chemical reaction occurs between the tested ions and the titrant, leading to changes in ion concentration and, consequently, corresponding changes in the potential of the indicator electrode. When approaching the stoichiometric point, significant changes in the concentration of the tested ions in the solution occur, resulting in a sudden jump in the potential of the indicator electrode. By observing and measuring changes in the electromotive force of the working cell, the endpoint of titration can be determined, and the content of the tested component can be calculated accordingly.

III. Usage Method of Potentiometric Titration System

Preparation:

  • Select appropriate indicator and reference electrodes based on the type of titration reaction.
  • Install the electrodes, ensuring correct connection of positive and negative terminals.
  • Install the burette and solenoid valve, connect relevant tubing, and fill with titration solution.

Parameter Setting:

  • Select the preset endpoint potential value and adjust the potentiometer to the required value.
  • Select the mv or pH range as needed and fix the preset potentiometer.

Titration Operation:

  • Start the titration, controlling the titration speed to avoid being too fast or too slow.
  • Observe potential changes. When approaching the endpoint, the potentiometer will automatically adjust the titration speed (e.g., approximately 0.02 ml each time) until reaching the endpoint potential.
  • The endpoint indicator light will illuminate, and a buzzer will sound, indicating the end of the titration.

Data Processing:

  • Record the volume of titrant consumed at the endpoint and calculate the content of the tested component using the formula.

IV. Common Faults and Repair Methods of Potentiometric Titration System

Inaccurate Reading:

  • Cause: Electrode contamination or expired indicator solution.
  • Repair Method: Clean the electrode surface to remove contamination; replace expired indicator solution.

Unstable Measurement:

  • Cause: Bubbles in the sample or incomplete immersion of the electrode.
  • Repair Method: Stir the sample to eliminate bubbles; adjust the electrode position and angle to ensure complete immersion in the sample.

Non-Responsive Electrode:

  • Cause: Electrode distortion or contamination.
  • Repair Method: Inspect the electrode appearance and replace if distorted; clean the electrode surface to remove contaminants.

Low Titration Liquid Level:

  • Cause: Insufficient injection or volume of titration liquid.
  • Repair Method: Fully inject the titration liquid; adjust the volume of titration liquid to ensure sufficiency.

Large Reading Fluctuation:

  • Cause: Electrode residue, expired or contaminated reagents, or loosely closed reagent bottle caps.
  • Repair Method: Clean and calibrate the electrode; check and replace expired or contaminated reagents; ensure tight closure of reagent bottle caps.

Leakage Issues:

  • Cause: Damaged liquid level sensor, open or clogged drip control valve.
  • Repair Method: Replace the liquid level sensor; check and close the drip control valve; clean the drip tubing.

Abnormal Display or Non-Function:

  • Cause: Power connection issues, damaged display screen.
  • Repair Method: Check power connections and supply; replace the damaged display screen.

Other Faults:

For complex issues such as internal circuit faults, sensor faults, and control board faults, it is recommended to contact professionals for repair.

V. Summary of Repaired Potentiometric Titration System Brands and Models by Longi Electromechanical

  1. Metrohm
    • Titrando Series: 888 Titrando, 890 Titrando, 905 Titrando, 906 Titrando
    • Eco Titrator: Basic Titration System
    • Ti-Touch Series: 916 Ti-Touch, 915 KF Ti-Touch
  2. Mettler Toledo
    • T70 Series: T70 Excellence, T90 Excellence
    • Compact Series: G20 Compact, G10 Compact, G30 Compact
    • InMotion Series: InMotion Flex, InMotion Max
    • EasyPlus Series: EasyPlus Titrator
  3. Kyoto Electronics Manufacturing (KEM)
    • AT Series: AT-710, AT-510
    • MKC Series: MKC-710, MKC-610
  4. Hanna Instruments
    • HI902C: Automatic Potentiometric Titrator
    • HI931: Automatic Potentiometric Titrator
  5. Hach
    • Titralab AT1000 Series: AT1102, AT1112, AT1122
  6. Titrando
    • T70: Universal Potentiometric Titration System
    • T90: Advanced Potentiometric Titration System
  7. Analytik Jena
    • Titration Excellence Series: TL 7000, TL 7750, TL 7800
  8. SI Analytics (Xylem)
    • TitroLine Series: TitroLine 5000, TitroLine 7000, TitroLine 7750
  9. Hiranuma
    • COM Series: COM-300A, COM-1700
  10. KNAUER
    • Smartline: Fully Automatic Potentiometric Titration System
  11. Thermo Fisher Scientific
    • Orion Star T900: Potentiometric Titration System
  12. Bante Instruments
    • Bante900: Automatic Potentiometric Titrator

Longi Electromechanical has nearly 30 years of experience in repairing potentiometric titration systems and can quickly repair various instruments. Additionally, we recycle and sell various potentiometric titration systems. Welcome to consult.

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LiDAR Technology: Comprehensive Analysis of Principles, Usage, Common Faults, and Repair Methods

Overview of LiDAR

LiDAR (Light Detection and Ranging) is a remote sensing technology that utilizes laser pulses for ranging and speed measurement. By emitting laser pulses and measuring the time difference for their reflection back, it calculates the distance between objects and sensors. LiDAR is widely applied in autonomous driving, robotic navigation, surveying and mapping, terrain modeling, and is gradually penetrating consumer electronics such as smartphones, providing users with more precise and diverse functional experiences.

Principles

The working principles of LiDAR mainly involve the following steps:

  • Laser Pulse Emission: The LiDAR emitter sends out short, intense laser pulses, typically with wavelengths of 905nm or 1550nm in the near-infrared spectrum.
  • Target Reflection: When the laser pulses hit the surface of the target object, part of the laser energy is reflected back to the LiDAR system.
  • Time Measurement: The LiDAR receiver detects the reflected pulses and precisely measures the time difference from pulse emission to reception.
  • Distance Calculation: Knowing the speed of light, the distance between the LiDAR and the target object is calculated using the measured time difference.
  • Data Processing: The received signals are amplified, filtered, and digitized to extract information such as distance, speed, and shape of the target, which is used for imaging or further analysis.

Usage Method

Taking the LiDAR scanner on an iPhone as an example, the usage method is generally as follows:

  1. Enable Function: Go to the phone’s settings menu, find the “Camera” option under “Privacy”, and enable the “Measure” function.
  2. Open Camera App: In the camera app interface, the measuring tool icon will be displayed at the top; tap to enter LiDAR scanner mode.
  3. Align Target: Align the phone with the target object to be measured and move the phone to focus on different parts of the object.
  4. Perform Scan: Tap the white button on the screen to scan. The system will use LiDAR technology to quickly measure the object’s dimensions and distance, displaying the information on the screen.

Faults and Repair Methods

LiDAR may encounter various faults during usage. Common fault types and repair methods include:

  • Sensor Error:
    • Phenomenon: May cause communication interruption, abnormal scanning, etc.
    • Solution: Check if the device communication lines are unobstructed and confirm if there is any loosening or damage. Restart the device or replace the sensor if necessary.
  • Laser Beam Issue:
    • Phenomenon: May lead to inaccurate measurements or abnormal phenomena such as scattered points.
    • Solution: Calibrate the laser emitter and receiver to ensure stable beam quality. If the problem is severe, consider replacing the laser or repairing the device.
  • Data Transmission Problem:
    • Phenomenon: Data interruption, data loss, etc., may occur.
    • Solution: Check the contact and functionality of the device’s transmission pathways and communication lines. Replace the lines or device if faulty. For software issues, try upgrading or reinstalling the software.
  • Environmental Interference:
    • Phenomenon: Factors such as light and reflection may affect measurement results.
    • Solution: Ensure sufficient and stable ambient light during scanning and avoid interference from intense light sources or reflective objects.
  • Mechanical Component Fault (For Mechanical Rotating LiDAR):
    • Phenomenon: Issues like mirrors or prisms not rotating smoothly may limit the scanning range.
    • Solution: Check if the mechanical components are well-lubricated and clean and maintain them if necessary.

Summary

As a high-precision remote sensing technology, LiDAR plays a crucial role in multiple fields. By understanding its working principles and usage methods, users can better leverage this technology to enhance work efficiency and experience. Simultaneously, for potential faults, promptly adopting effective repair measures can ensure the stable operation and accurate measurement of the LiDAR system. With continuous technological advancements, the application prospects of LiDAR will become even broader.

Brands and Models of LiDAR Repaired by Longi Electromechanical

  1. Velodyne Lidar
    • Alpha Prime™: Advanced LiDAR sensor
    • VLS-128™: High-resolution 128-channel LiDAR
    • VLP-32C Ultra Puck™: High-performance, compact LiDAR
    • Puck™ (VLP-16): Compact, 16-channel LiDAR
    • Puck LITE™: Lightweight version of VLP-16
  2. Ouster
    • OS1 Series: OS1-16, OS1-32, OS1-64
    • OS2 Series: OS2-128
    • OS0 Series: OS0-32, OS0-64
  3. Quanergy
    • M8 Series: M8-1, M8-2
    • S3 Series: S3-2, S3-Qi
  4. Innoviz
    • InnovizOne: Solid-state LiDAR sensor
    • InnovizPro: Automotive-grade LiDAR
  5. Luminar
    • Iris: Automotive-grade LiDAR
    • Hydra: High-performance LiDAR for autonomous vehicles
  6. Hesai
    • Pandora: Combined camera and LiDAR sensor
    • Pandar40P: 40-channel LiDAR
    • Pandar64: 64-channel LiDAR
    • PandarQT: Automotive-grade, long-range LiDAR
  7. RoboSense
    • RS-LiDAR-M1: MEMS solid-state LiDAR
    • RS-LiDAR-16: 16-channel mechanical LiDAR
    • RS-Ruby: High-performance, mechanical LiDAR
  8. Livox
    • Horizon: High-density, long-range LiDAR
    • Mid-40: High-precision, medium-range LiDAR
    • Mid-70: Wide field of view, medium-range LiDAR
  9. Velarray (by Velodyne)
    • H800: Solid-state, high-performance LiDAR
    • M1600: Automotive-grade, solid-state LiDAR
  10. Valeo
    • Scala 2: Automotive-grade, high-resolution LiDAR
  11. Cepton
    • Vista Series: Vista-P60, Vista-X90
    • Sora Series: Sora-P60, Sora-X90
  12. AEye
    • iDAR (Intelligent Detection and Ranging): 4Sight M, 4Sight A
  13. LeddarTech
    • Leddar Pixell: 3D flash LiDAR
    • Leddar Vu8: Solid-state LiDAR
  14. Leica Geosystems
    • Leica BLK360: Imaging laser scanner
    • Leica BLK2GO: Handheld imaging laser scanner
    • Leica PegasusUltimate: Mobile mapping solution
  15. SICK
    • MRS1000: Multi-layer scanner
    • LMS1000: Long-range scanner
  16. RIEGL
    • VZ Series: VZ-400i, VZ-2000i
    • LMS Series: LMS-Q780, LMS-Q1560
  17. Topcon
    • GLS-2000: Laser scanner
    • RL-SV2S: Rotating laser
  18. Faro
    • Focus3D Series: Focus3D X 330, Focus3D X 130
    • S Series: S350, S150
  19. Trimble
    • X7: 3D laser scanner
    • TX8: High-speed laser scanner

Longi Electromechanical Company has nearly 30 years of experience in repairing LiDAR, enabling quick repairs for various instruments. Additionally, we recycle and sell various types of LiDAR. Welcome to consult.

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Comprehensive Analysis of Particle Size Analyzers: Principles, Brands,Usage, Common Faults, and Repair Methods

Comprehensive Analysis of Particle Size Analyzers: Principles, Usage, Common Faults, and Repair Methods

Overview of Particle Size Analyzers

Particle size analyzers are physical instruments used to measure the size and distribution of solid particles. They find extensive applications in materials science, geology, chemical engineering, the food industry, and more. Leveraging various physical principles such as laser scattering, sedimentation, electrical resistance, and microscopic observation, these analyzers precisely measure and analyze particle size characteristics.

Principles

The core principles of particle size analyzers vary based on the measurement method employed. Laser particle size analyzers are a common type. They utilize a laser light source to illuminate the sample, causing particles to scatter light. The intensity and angle of scattered light are closely related to particle size. By measuring the intensity and distribution of scattered light and applying Mie scattering theory or Fraunhofer diffraction theory, the particle size distribution can be calculated.

Laser Scattering Principle: When a laser beam illuminates particles, they scatter light. The intensity and angle of scattered light are inversely proportional to particle diameter. Laser particle size analyzers use a series of photosensitive detectors to measure scattered light intensity at different angles, thereby inferring particle size distribution.

Data Processing: The instrument converts the collected scattered light signals into electrical signals and processes them using built-in software algorithms. Ultimately, statistical parameters such as average particle size and particle size distribution are output.

Usage

  1. Sample Preparation: Choose and preprocess appropriate samples according to testing purposes and requirements, such as screening and drying, to ensure sample uniformity and representativeness.
  2. Instrument Start-up and Calibration: Turn on the instrument power, set instrument parameters (e.g., fluid medium, stirring speed) according to the operation manual, and calibrate using standard samples to ensure measurement accuracy.
  3. Sample Measurement: Place the preprocessed sample into the instrument, initiate the measurement program, and observe the measurement process in real-time until completion.
  4. Data Analysis: After measurement, conduct statistical analysis on the results, calculate parameters such as average particle diameter and particle size distribution, plot particle size distribution curves, and interpret and evaluate the results.

Common Faults and Repair Methods

  1. Laser Source Issues:
    • Fault Phenomenon: Decreased or unstable laser intensity.
    • Repair Method: Check if the laser source needs replacement or cleaning, following the manufacturer’s instructions.
  2. Detector Faults:
    • Fault Phenomenon: Inaccurate measurement results.
    • Repair Method: Inspect the detector for cleanliness, damage, or aging, and perform maintenance or replacement if necessary.
  3. Sample Cell Contamination:
    • Fault Phenomenon: Large measurement errors.
    • Repair Method: Regularly clean the sample cell to ensure proper sample dispersion.
  4. Power Supply Issues:
    • Fault Phenomenon: Instrument failure to start or abnormal display.
    • Repair Method: Check the power cord, socket, and fuse to ensure stable power supply.
  5. Software Issues:
    • Fault Phenomenon: Unstable software operation or failure to upgrade.
    • Repair Method: Regularly check and install software updates to ensure compatibility with the operating system.
  6. Mechanical Component Wear:
    • Fault Phenomenon: Abnormal instrument operation or excessive noise.
    • Repair Method: Inspect and replace worn components, and perform regular lubrication.
  7. Environmental Factor Influence:
    • Fault Phenomenon: Large measurement errors.
    • Repair Method: Monitor the laboratory environment, adjust temperature and humidity, and avoid vibration and electromagnetic interference.
  8. Operational Errors:
    • Fault Phenomenon: Incorrect settings or inaccurate data interpretation.
    • Repair Method: Provide operational training to ensure users understand all software functions.

Brands and Models of Particle Size Analyzers Repaired by Longi Electromechanical

  1. Malvern Panalytical
    • Mastersizer Series: Mastersizer 3000, Mastersizer 2000
    • Zetasizer Series: Zetasizer Ultra, Zetasizer Nano ZS, Zetasizer Pro
    • Spraytec: Spray Particle Size Analyzer
    • Sysmex FPIA-3000: Flow Particle Image Analyzer
  2. Beckman Coulter
    • LS Series: LS 13 320 XR, LS 13 320 MW
    • Multisizer Series: Multisizer 4e
    • DelsaMax Series: DelsaMax PRO, DelsaMax CORE
  3. HORIBA Scientific
    • LA Series: LA-960V2, LA-350
    • SZ Series: SZ-100
    • CAMSIZER Series: CAMSIZER X2, CAMSIZER P4
  4. Anton Paar
    • Litesizer Series: Litesizer 500, Litesizer 100
    • PSA Series: PSA 990, PSA 1090
  5. Microtrac (Nikkiso)
    • Bluewave: Particle Size Analyzer
    • SYNC: Laser Diffraction Analyzer
    • Nanotrac Wave II: Dynamic Light Scattering Analyzer
  6. Sympatec
    • HELOS Series: HELOS/BR, HELOS/KR
    • QICPIC Series: QICPIC/R, QICPIC/L
    • NANOPHOX: Photon Cross-correlation Spectroscopy Analyzer
  7. Particle Sizing Systems (PSS)
    • Nicomp Series: Nicomp 380, Nicomp DLS/ZLS
    • AccuSizer Series: AccuSizer 780, AccuSizer Mini
  8. Micromeritics
    • SediGraph III Plus: Particle Size Analyzer
    • Saturn DigiSizer II: High-Definition Digital Particle Size Analyzer
  9. Brookhaven Instruments
    • 90Plus: Particle Size Analyzer
    • ZetaPALS: Zeta Potential Analyzer
    • NanoBrook Series: NanoBrook 90Plus PALS, NanoBrook ZetaPlus
  10. Bettersize Instruments
    • Bettersizer 2600: Laser Particle Size Analyzer
    • Bettersizer S3 Plus: Image Particle Size Analyzer
    • BeNano Series: BeNano 90 Zeta
  11. Fritsch
    • ANALYSETTE 22 NeXT Series: ANALYSETTE 22 NeXT Micro, ANALYSETTE 22 NeXT Nano
  12. AimSizer
    • AS-2011: Laser Particle Size Analyzer
    • AS-2012: Dynamic Light Scattering Particle Size Analyzer
  13. CILAS
    • CILAS 990: Laser Particle Size Analyzer
    • CILAS 1090: Laser Particle Size Analyzer
  14. Entegris
    • AccuSizer A2000: Single Particle Optical Sizing System
    • Nicomp N3000: Dynamic Light Scattering System
  15. Retsch Technology
    • CAMSizer Series: CAMSizer X2, CAMSizer P4

Longi Electromechanical Company has nearly 30 years of experience in repairing particle size analyzers and can quickly repair various instruments. Additionally, we recycle and sell various particle size analyzers. Welcome to consult us.

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Spectrophotometer Guide: Principles, Usage, Troubleshooting, and Maintenance — PE UV Spectrophotometer, UV Spectrophotometer, Atomic Absorption Spectrophotometer, UV-Vis Spectrophotometer

Spectrophotometer Guide: Principles, Usage, Troubleshooting, and Maintenance — PE UV Spectrophotometer, UV Spectrophotometer, Atomic Absorption Spectrophotometer, UV-Vis Spectrophotometer

I. Overview

The spectrophotometer, also known as the PE UV spectrophotometer, UV spectrophotometer, atomic absorption spectrophotometer, and UV-Vis spectrophotometer, is a precise spectral analysis instrument. It analyzes the composition and content of substances by measuring their absorption or transmission of light at specific wavelengths. Widely applied in chemistry, biology, medicine, environmental science, and other fields, it is an indispensable analytical tool in laboratories.

II. Principles

The fundamental principle of the spectrophotometer is based on the Lambert-Beer Law. When a monochromatic light passes through a uniform, non-scattering medium, the absorbance A is proportional to the concentration c of the absorbing substance in the medium and the thickness l of the medium. The relationship is expressed as A = kcl, where k is a proportional constant related to the properties of the absorbing substance and the wavelength of the incident light.

The core components of a spectrophotometer include the light source, monochromator, sample chamber, detector, and data processing system. The light source provides broad-spectrum light radiation, while the monochromator decomposes this light into monochromatic light and allows specific wavelengths to pass through. The sample chamber holds the sample to be tested; when monochromatic light passes through the sample, part of the light is absorbed, and the remaining light passes through the sample into the detector. The detector converts the light signal into an electrical signal, which is then analyzed and processed by the data processing system to obtain parameters such as the sample’s absorbance or transmittance.

III. Usage Method

  1. Preheat the Instrument: Turn on the power switch and preheat the instrument for 20-30 minutes to stabilize its performance.
  2. Select Wavelength: According to experimental requirements, rotate the wavelength adjuster to indicate the desired monochromatic light wavelength.
  3. Set Sensitivity: Choose an appropriate sensitivity setting based on the absorption of light by the colored solution and keep it fixed.
  4. Adjust “0” Point: Rotate the “0” potentiometer so that the pointer on the readout indicates “0” transmittance.
  5. Adjust T=100%: Place a cuvette containing distilled water (or blank solution) in the cuvette holder, cover the dark box, and rotate the light adjuster to achieve T=100% transmittance.
  6. Measurement: Place the cuvette with the sample to be tested in the cuvette holder, gently pull the lever to allow the solution into the light path, and read the absorbance value.
  7. Shutdown: After the experiment, cut off the power and clean the cuvettes and instrument components.

IV. Common Faults and Repair Methods

  1. Unstable Digital Display
    • Causes: Environmental vibration, high air flow near the light source, external strong light interference, insufficient preheating time, desiccant failure in the photoelectric tube.
    • Solutions: Improve the working environment, extend preheating time, replace or bake the desiccant, and send for repair if necessary.
  2. Instrument Cannot Be Zeroed
    • Causes: Incomplete closure of the light gate, “100%” knob turned to the maximum, instrument dampness, circuit failure.
    • Solutions: Repair the light gate components, readjust the “100%” knob, use a hairdryer to dry the instrument and replace the desiccant, repair the circuit.
  3. Instrument Cannot Adjust to “100%”
    • Causes: Insufficient light energy, cuvette holder not in position, aging of the photoelectric conversion part, circuit failure.
    • Solutions: Increase the sensitivity multiplier, adjust the cuvette holder, replace the photoelectric conversion components, repair the circuit.
  4. Light Source Lamp Failure
    • Causes: Broken filament, weak output light spot energy.
    • Solutions: Replace with a bulb of the same specifications, adjust the position of the light source lamp to align the filament with the light output hole.
  5. Monochromator Failure
    • Causes: Tight wavelength adjuster, unreadable wavelength dial, no change in emitted light.
    • Solutions: Repair the fit between the axis and sleeve, grind the rubber friction wheel, calibrate the wavelength adjustment screw, replace the protective glass.

V. Maintenance

  1. Environmental Control: Maintain constant laboratory temperature and humidity, reduce vibration and strong light interference.
  2. Cleaning and Maintenance: Regularly clean the instrument casing and internal components, keep optical elements clean and dry.
  3. Regular Inspection: Calibrate and verify the instrument regularly to ensure the accuracy and reliability of measurements.
  4. Usage Precautions: Avoid contaminating the cuvette surface, handle with care, clean and dry correctly.

VI. Brands and Models of Spectrophotometers Repaired by Longi Electromechanical

  1. Agilent Technologies
    • Cary Series: Cary 60 UV-Vis, Cary 100 UV-Vis, Cary 300 UV-Vis, Cary 4000 UV-Vis, Cary 5000 UV-Vis, Cary 7000 UMS
  2. Thermo Fisher Scientific
    • Evolution Series: Evolution 60S, Evolution 220, Evolution 260 Bio, Evolution 350
    • NanoDrop Series: NanoDrop One/OneC, NanoDrop 2000/2000C
  3. Shimadzu
    • UV Series: UV-1800, UV-2600, UV-2700, UV-3600 Plus
    • BioSpec Series: BioSpec-nano
  4. PerkinElmer
    • LAMBDA Series: LAMBDA 25/35/45 UV/Vis, LAMBDA 365 UV/Vis, LAMBDA 650 UV/Vis/NIR, LAMBDA 850 UV/Vis/NIR, LAMBDA 1050+ UV/Vis/NIR
  5. JASCO
    • V-700 Series: V-730 UV-Vis, V-750 UV-Vis/NIR, V-760 UV-Vis/NIR, V-770 UV-Vis/NIR, V-780 UV-Vis/NIR
  6. Hitachi
    • UV-Vis/NIR Spectrophotometers: U-5100, UH4150, UH5300, U-2900/2910, U-3900/3900H, UH5700, UH4150
    • Fluorescence Spectrophotometers: F-7000, F-7100
    • Atomic Absorption Spectrophotometers (AAS): ZA3000 Series
  7. Bruker
    • TENSOR Series: TENSOR II FT-IR
  8. BioTek (Agilent)
    • Epoch Series: Epoch 2 Microplate Spectrophotometer
    • Synergy Series: Synergy H1 Hybrid Reader
  9. Horiba
    • Duetta: Fluorescence and Absorbance Spectrometer
    • FluoroMax Series: FluoroMax-4, FluoroMax Plus
  10. Beckman Coulter
    • DU Series: DU 730, DU 800
  11. Hach
    • DR Series: DR3900, DR6000
  12. Analytik Jena
    • Specord Series: Specord 50 PLUS, Specord 200 PLUS, Specord 250 PLUS
  13. Ocean Insight
    • Flame Series: Flame-S UV-Vis
    • Maya Series: Maya2000 Pro
  14. Lambda Scientific
    • LS Series: LS-1055 UV-Vis, LS-1155 UV-Vis/NIR
  15. Edinburgh Instruments
    • FS5: Fluorescence Spectrometer
    • FLS1000: Photoluminescence Spectrometer
  16. datacolor: Spectro700UV, 200R, 200M
  17. Beijing Purkinje: TAS-990AFG, Flame-Graphite Furnace Integrated Atomic Absorption Spectrophotometer

Longi Electromechanical Company specializes in the repair of spectrophotometers (PE UV spectrophotometers, UV spectrophotometers, atomic absorption spectrophotometers, UV-Vis spectrophotometers) with nearly 30 years of experience. We can quickly repair various instruments and also offer recycling and sales of various vacuum gauges. Welcome to consult.

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Vacuum Gauge Comprehensive Guide: Principles, Usage, Troubleshooting, and Brands

I. Overview of Vacuum Gauge

A vacuum gauge, also known as a vacuum meter or vacuum gauge tube, is an instrument specifically designed to measure gas pressure or vacuum degree. It indirectly reflects the level of vacuum by measuring the pressure generated by gas molecule movement in a confined space. In scientific research and industrial production, vacuum gauges are widely used to precisely control vacuum environments, ensuring the stability and accuracy of experiments or production processes.

II. Principles of Vacuum Gauge

The working principle of a vacuum gauge is based on the physical effects of gas molecules under different pressures. According to different measurement principles, vacuum gauges can be mainly divided into three categories: those utilizing mechanical properties, gas dynamic effects, and charged particle effects.

1. Utilizing Mechanical Properties

  • Bourdon Gauge: Utilizes the expansion of a thin copper tube under gas pressure, driving a lever and gear rotation to indicate different scales, thereby reading the pressure value.
  • Diaphragm Capacitance Gauge: The metal diaphragm deforms under different pressures, leading to changes in capacitance between it and the electrodes. The pressure value is inferred by measuring the change in capacitance.

2. Utilizing Gas Dynamic Effects

  • Pirani Gauge: Utilizes the relationship between resistance and temperature, inferring pressure by measuring the temperature change of a heated wire under different pressures.
  • Thermocouple Gauge: Similar to the Pirani Gauge but directly measures the temperature change of the heated wire instead of resistance change.

3. Utilizing Charged Particle Effects

  • Hot Cathode Ionization Gauge: Emits electrons from a hot cathode to ionize gas molecules in the vacuum, collecting the generated ion current to infer pressure.
  • Cold Cathode Ionization Gauge: Utilizes magnetically controlled discharge to ionize gas molecules, collecting ion current for pressure measurement.

III. Usage Methods of Vacuum Gauge

  1. Select the Appropriate Vacuum Gauge: Choose the suitable model and range of the vacuum gauge based on measurement needs.
  2. Calibrate the Vacuum Gauge: Calibrate before use to ensure the accuracy of measurement results.
  3. Connect the Vacuum Gauge: Connect the vacuum gauge to the device or container being measured, ensuring good sealant at the connection point.
  4. Start Measurement: Turn on the device or container being measured, wait for it to reach a stable state, and then turn on the vacuum gauge for measurement.
  5. Read Data: After stabilization, read the data displayed on the vacuum gauge, paying attention to data stability and accuracy.
  6. End Measurement: After measurement, turn off the vacuum gauge and the device or container being measured, and properly store the vacuum gauge.

IV. Faults and Repair Methods of Vacuum Gauge

1. Unable to Start

  • Check the power supply: Confirm whether the vacuum gauge is properly plugged in and the plug is secure.
  • Check the fuse: Inspect whether the fuse is burned out and replace it if necessary.
  • Check the switch: Confirm the correct position and settings of the switch.

2. Inaccurate Readings

  • Check the connection port: Confirm whether the connection port is loose or tightly connected.
  • Check the range setting: Confirm whether the range setting is correct to avoid exceeding the measurement range.
  • Check the sensor: A damaged sensor may lead to inaccurate readings and needs replacement.

3. Readings Too High or Too Low

  • Check gas flow: Abnormal gas flow may affect readings, so check whether the gas flow is normal.
  • Check vacuum tube quality: Poor quality of the vacuum tube may also lead to inaccurate readings and needs replacement.

4. Air Leakage

  • Check sealant: Confirm the sealant of the vacuum gauge and vacuum tube, and perform sealing treatment if necessary.
  • Detect hidden leaks: Use methods such as gas infusion to detect and repair hidden leak points.

Preventive Measures

  • Regular inspection: Periodically maintain and inspect the vacuum gauge to ensure its normal operation.
  • Keep clean: Maintain the cleanliness of the vacuum gauge to avoid interfering with measurement results.
  • Safe operation: Pay attention to operational safety to avoid equipment damage or accidents caused by improper operation.

V. Summary

As an important tool for measuring vacuum degree or pressure, vacuum gauges play a crucial role in scientific research and industrial production. Understanding their working principles, mastering correct usage methods, and handling common faults are essential for ensuring the accuracy of measurement results and the stable operation of equipment. Meanwhile, regular maintenance and inspection of vacuum gauges are also key to ensuring their long-term stable performance.

VI. Brands and Models of Vacuum Gauges Repaired by Longi Electromechanical

  1. Inficon
    • Sky CDG025D: Capacitance Diaphragm Gauge
    • Sky CDG100D: Capacitance Diaphragm Gauge
    • Sky CDG200D: Capacitance Diaphragm Gauge
    • Skyview: Combination Pirani and Cold Cathode Gauge
  2. Edwards
    • nEXT Series: nEXT730D, nEXT930D
    • Active Pirani Series: APG100, APG200
    • Active Inverted Magnetron Series: AIM-X, AIM-S
  3. Pfeiffer Vacuum
    • ActiveLine Series: TPR 280, TPR 270
    • DigiLine Series: DPG 102, DPG 109
    • Compact Series: PCR 260, PCR 270
  4. MKS Instruments
    • Granville-Phillips Series: 370 Stabil-Ion, 375 Convectron, 390 Micro-Ion
    • Baratron Series: 627D, 629A
    • PDR Series: PDR2000
  5. Leybold
    • Thermovac Series: TTR 91, TTR 101
    • Ceravac Series: CTR 100, CTR 101
    • Ionivac Series: ITR 90, ITR 91
  6. Agilent Technologies
    • ConvecTorr: Convectron Gauge
    • UHV Ionization Gauge: Ultrahigh Vacuum Gauge
    • FRG-700: Full Range Gauge
  7. Teledyne Hastings
    • DV-6: Thermocouple Vacuum Gauge
    • HPM-2002: Digital Vacuum Gauge
    • HVG-2020B: Digital Vacuum Gauge
  8. Brooks Instrument
    • 5866: Capacitance Manometer
    • 5850: Mass Flow Controller
    • 5863: Digital Pressure Gauge
  9. Kurt J. Lesker
    • 945 Series: Inverted Magnetron Gauge
    • 350 Series: Pirani Gauge
    • 354 Series: Ionization Gauge
  10. ULVAC
    • G-Tran Series: G-Tran ST1, G-Tran PT1
    • SW-1 Series: SW-1
    • M-100 Series: M-100
  11. InstruTech
    • B-RAX 3000: Vacuum Gauge Controller
    • CDG-500: Capacitance Diaphragm Gauge
    • IGC100: Cold Cathode Gauge
  12. Thyracont
    • Smartline Series: VSR, VSP
    • Digitalline Series: VD8, VD12
    • Analogline Series: VMA, VPA
  13. Agilent
    • XGS-600: Gauge Controller
    • FRG-720: Full Range Gauge
    • UHV-24: Ultra High Vacuum Gauge
  14. Sens4
    • VQM-83: Vacuum Quality Monitor
    • VSM-32: Vacuum Sensor Module
  15. Dycor (AMETEK)
    • Dycor Quadlink: Residual Gas Analyzer
    • Dycor 1000: Vacuum Gauge

Longi Electromechanical Company has nearly 30 years of experience in repairing vacuum gauges and can quickly repair various instruments. Additionally, they recycle and sell various vacuum gauges. Welcome to consult.

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Analysis Balance Overview, Principle, Brand,Usage, Faults, and Maintenance Methods

Analysis Balance Overview, Principle, Usage, Faults, and Maintenance Methods

Analysis Balance Overview

The analysis balance, a high-precision weighing instrument, finds extensive application in laboratories, factories, and scientific research. It is employed to accurately measure the mass of objects and boasts high precision, stability, and adaptability to various substances, including powders, liquids, and gases. The advent of analysis balances has significantly enhanced the accuracy of experimental results and the control precision of production processes.

Principle

Designed based on the principle of lever balance, the analysis balance relies on adjusting the weight of counterweights to balance the mass of the measured object. Specifically, the beam of the balance has small pans at both ends, with one end for counterweights and the other for the object to be measured. When the masses at both ends are equal, the pointer fixed on the beam aligns with the central scale, indicating that the balance is in equilibrium. Modern analysis balances incorporate advanced sensor technology and microelectronics, further enhancing measurement precision and stability through electromagnetic force balance principles.

Usage Method

  • Placement and Adjustment: Position the balance on a horizontal and stable surface, ensuring it is level by adjusting the foot pads.
  • Zero Calibration: Press the “ON/OFF” button. Once the balance displays “0.0” or “0.00”, place the object to be weighed in the center of the balance pan. Wait for the digital display to stabilize, then press the “TARE” key to perform tare operation.
  • Weighing: Place the object to be weighed in the center of the balance pan. After the digital display stabilizes, the displayed value represents the mass of the object.

Precautions

  • Ensure the mass of the measured object does not exceed the balance’s capacity.
  • Avoid direct contact between the balance pan and wet objects or chemical reagents.
  • During weighing, place the object on the left and counterweights on the right, maintaining a stable environment inside and outside the balance.

Faults and Maintenance Methods

  • Display Value Continually Changes:
    • Fault Causes: Unbalanced balance, poor installation environment, volatile or hygroscopic substances being weighed.
    • Maintenance Methods: Level the balance, choose a suitable installation environment, and use containers to weigh volatile or hygroscopic substances.
  • Obviously Incorrect Display Result:
    • Fault Causes: Tare operation not performed, unbalanced balance, long-term lack of calibration.
    • Maintenance Methods: Perform tare operation, check and level the balance, and regularly calibrate it.
  • No Display or Display of Dashes:
    • Fault Causes: Power issues, damaged display.
    • Maintenance Methods: Check power plug and wire connections, replace damaged fuses or displays.
  • Hanging Ear Falls Off or Tilts:
    • Fault Causes: Too rapid opening or closing of the balance, or improper operation.
    • Maintenance Methods: Gently reposition the hanging ear and adjust it to a stable state. If unstable, use tools like needle-nose pliers for adjustment.
  • Internal and External Dampers Collide or Slightly Friction:
    • Fault Causes: Improper damper position or unbalanced balance.
    • Maintenance Methods: Check the balance’s level state, adjust the positions of internal and external dampers until there is no friction.
  • Projection Screen Displays Incorrect Scale Position:
    • Fault Causes: Reflecting mirror offset.
    • Maintenance Methods: Rotate the screw beside the projection screen to adjust the reflecting mirror position, ensuring the scale falls exactly on the projection screen.

Conclusion

As a high-precision measuring tool, the analysis balance plays a crucial role in scientific research, production control, and quality inspection. Understanding its principle, mastering correct usage methods, and handling common faults are vital for ensuring measurement accuracy and extending the balance’s lifespan. Regular maintenance and calibration can further enhance the performance and stability of the analysis balance.

Brands and Models of Analysis Balances Repaired by Longi Electromechanical

  1. Mettler Toledo
    • XPR Series: XPR2, XPR6U, XPR10, XPR26
    • XS Series: XS204, XS104, XS105
    • MS Series: MS104TS, MS204TS
  2. Sartorius
    • Cubis II Series: Cubis II MSA, Cubis II MSU, Cubis II MSE
    • Secura Series: Secura 124-1S, Secura 224-1S
    • Quintix Series: Quintix 124-1S, Quintix 224-1S
  3. Ohaus
    • Explorer Series: Explorer EX224, Explorer EX324, Explorer EX124
    • Adventurer Series: Adventurer AX224, Adventurer AX324, Adventurer AX124
    • Pioneer Series: Pioneer PX124, Pioneer PX224
  4. A&D Weighing
    • BM Series: BM-20, BM-22, BM-252
    • GX-A/GF-A Series: GX-224A, GF-224A
    • HR-AZ/HR-A Series: HR-250AZ, HR-300AZ
  5. Shimadzu
    • AP Series: AP225W, AP125W
    • AU Series: AUW-D, AUW220D
  6. Adam Equipment
    • Nimbus Series: Nimbus NBL 124e, Nimbus NBL 224e
    • Highland Series: Highland HCB 123, Highland HCB 223
  7. Radwag
    • XA 4Y Series: XA 220.4Y.A, XA 82/220.4Y
    • AS R2 Series: AS 82/220.R2, AS 310.R2
  8. Kern & Sohn
    • ABT Series: ABT 120-5DNM, ABT 220-5DNM
    • ALS-A/ALJ-A Series: ALS 120-4A, ALJ 220-4A
  9. Scientech
    • ZSA Series: ZSA 80, ZSA 120
    • SA Series: SA 80, SA 120
  10. Precisa
    • 321 Series: 321LS125M, 321LS220M
    • 360 Series: 360EP225SM-DR, 360ES125SM
  11. Denver Instrument
  12. Pinnacle Series: Pinnacle PI-225D, Pinnacle PI-114
  13. Sartorius (Old Models)
    • Analytical Series: Analytical A200S, Analytical A120S
  14. Setra Systems
    • Super II Series: Super II 225, Super II 125

Longi Electromechanical has nearly 30 years of experience in repairing analysis balances, enabling swift repairs for various instruments. Additionally, we recycle and sell various analysis balances. Welcome to consult.

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Comprehensive Analysis of Microtomes: Principles, Brand,Usage Methods, and Troubleshooting Guide

Comprehensive Analysis of Microtomes: Principles, Usage Methods, and Troubleshooting Guide

Overview of Microtomes

Microtomes are mechanical devices specifically designed to cut objects (such as food, medicinal herbs, plastics, paper, etc.) into thin slices or sections. They are widely used in various fields including food processing, medicinal herb slicing, scientific research (such as cell and tissue sectioning), and papermaking. With their stability, high precision, ease of operation, and continuous and uniform slicing, microtomes have become indispensable equipment in many industries.

Principles

The working principles of microtomes are mainly realized through the transmission system, cutting blade, cutting process, and discharge system.

  • Transmission System: Microtomes typically use electric motors as the power source. The motor’s rotational speed is transmitted to the blade through a transmission system consisting of a motor, flywheel, belts, and gears, ensuring the blade rotates quickly and stably.
  • Cutting Blade: The cutting blade is usually made of high-hardness materials (such as stainless steel). Its design and manufacturing quality directly affect the cutting effect and performance. The blade cuts the material through rapid rotation.
  • Cutting Process: The material to be cut is fed into the cutting area of the microtome through a material feeding device, where the blade performs the cutting. By adjusting the blade’s angle, rotational speed, and cutting thickness, slices of different thicknesses can be obtained.
  • Discharge System: The sliced material is removed from the microtome through a discharge system such as a conveyor belt, chute, or transfer device for further processing or packaging.

Usage Methods

  1. Preparation Stage: Cut the ingredients or material to be cut into appropriate sizes, remove unwanted parts, and prepare the microtome’s blade.
  2. Equipment Adjustment: Place the microtome on a stable table and adjust the blade’s cutting thickness according to the material’s thickness.
  3. Start Cutting: Place the material on the blade, ensuring it is of appropriate size to avoid blade damage. Start the microtome and gently hold the material to allow the blade to cut.
  4. Cleaning and Storage: After cutting, clean the microtome and blade with water, and store them after drying. Place the microtome in a safe location, out of reach of children.

Common Faults and Repair Methods

  1. Power Failure:
    • Phenomenon: The microtome cannot start normally or suddenly stops working.
    • Solution: Check if the power plug is inserted, if the power cord is damaged, if the power switch is on, and if the fuse is blown. If the power is normal, it may be a motor fault, and professional maintenance personnel should be contacted for repair.
  2. Poor Cutting Effect:
    • Phenomenon: The cutting surface is uneven, the dimensions are inaccurate, or excessive powder is produced.
    • Solution: Check if the blade is sharp and replace it if not; adjust the slicing thickness, speed, and pressure to ensure correct parameter settings; check if the material is too hard or sticky, and adjust the material state accordingly.
  3. Excessive Noise:
    • Phenomenon: Abnormal noise occurs during operation.
    • Solution: Check if the transmission components are loose or damaged, and repair or replace them in a timely manner; regularly clean and maintain the microtome to reduce noise generation.
  4. Safety Protection Device Fault:
    • Phenomenon: The safety device fails or malfunctions, causing the microtome to operate abnormally or stop.
    • Solution: Check if the safety device is damaged or loose, and repair or replace it in a timely manner; check if the safety device’s circuit is intact, and contact professional maintenance personnel for repair if there are issues.
  5. Material Jamming or Blockage:
    • Phenomenon: The material gets stuck or blocked during the slicing process.
    • Solution: Clean the residual material inside the microtome to ensure the slicing channel is clear; adjust the material feeding speed and quantity to avoid excessive material causing blockage; check if the microtome’s feeding device and transmission components are working normally, and repair them in a timely manner.

Conclusion

As an efficient and precise cutting device, microtomes play a significant role in modern production and scientific research. Understanding their working principles, correct usage methods, as well as common faults and repair methods is crucial for improving production efficiency and ensuring equipment safety.

Brands and Models of Microtomes Repaired by Longi Electromechanical Company

  1. Leica Biosystems
    • RM2235: Rotary Microtome
    • RM2245: Rotary Microtome
    • RM2255: Fully Automated Rotary Microtome
    • CM1950: Cryostat Microtome
    • CM1860: Cryostat Microtome
    • UC7: Ultramicrotome
  2. Thermo Fisher Scientific
    • HM355S: Automatic Microtome
    • HM340E: Electronic Rotary Microtome
    • HM325: Manual Rotary Microtome
    • CryoStar NX70: Cryostat Microtome
    • CryoStar NX50: Cryostat Microtome
  3. Sakura Finetek
    • Accu-Cut SRM 200: Manual Rotary Microtome
    • Accu-Cut SRM 300: Manual Rotary Microtome
    • Tissue-Tek Cryo3 Flex: Cryostat Microtome
    • Tissue-Tek AutoSection: Automated Microtome
  4. Microm (part of Thermo Fisher Scientific)
    • HM355S: Automatic Microtome
    • HM340E: Electronic Rotary Microtome
    • HM325: Manual Rotary Microtome
  5. RMC Boeckeler
    • PT-PC PowerTome: Ultramicrotome
    • PT-X PC PowerTome: Ultramicrotome
    • CR-X Cryo: Cryo Ultramicrotome
    • MT-990: Rotary Microtome
  6. Diatome
    • Histo Diamond Knife: Knife for ultramicrotome
    • Ultra Diamond Knife: Knife for ultramicrotome
  7. Medite
    • M530: Rotary Microtome
    • T690: Semi-automatic Rotary Microtome
    • T530: Manual Rotary Microtome
  8. Slee Medical
    • CUT 6062: Fully Automated Rotary Microtome
    • CUT 5062: Semi-automatic Rotary Microtome
    • CUT 4062: Manual Rotary Microtome
    • MNT Modular: Cryostat Microtome
  9. Bright Instrument Company
    • Bright 8250: Rotary Microtome
    • Bright 5040: Sliding Microtome
    • Bright OTF5000: Cryostat Microtome
  10. Sakura Seiki
    • SRM 200: Rotary Microtome
    • SRM 300: Rotary Microtome
  11. Anglia Scientific
    • AS-400: Automatic Rotary Microtome
    • AS-300: Manual Rotary Microtome
  12. Thermo Shandon
    • Finesse 325: Manual Rotary Microtome
    • Finesse ME+: Motorized Rotary Microtome
  13. Reichert Technologies
    • Jung Histocut 820: Rotary Microtome
    • Jung HistoStat 900: Sliding Microtome
  14. Yamato
    • MCT-3: Manual Rotary Microtome
  15. SLEE Medical
    • CUT 4062: Manual Rotary Microtome
    • CUT 5062: Semi-Automatic Rotary Microtome
    • CUT 6062: Fully Automated Rotary Microtome
  16. Disco
    • DAD Series: DAD321, DAD322, DAD3350
    • DFD Series: DFD6362, DFD641, DFD651
    • MQMA Series
    • DFG Series

Longi Electromechanical Company has nearly 30 years of experience in repairing microtomes and can quickly repair various instruments. Additionally, they recycle and sell various types of microtomes. Welcome to consult.

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Comprehensive Analysis of Headspace Sampler: Principles,Brand, Usage Methods, and Troubleshooting Guide

I. Overview of Headspace Sampler

The headspace sampler is an efficient and convenient sample pretreatment method in gas chromatography. Its principle involves placing the sample to be tested in a sealed container, heating it to volatilize the volatile components, achieving equilibrium in the gas-liquid (or gas-solid) phases, and then directly extracting the top gas for chromatographic analysis to detect the composition and content of volatile components in the sample. This technique simplifies the sample pretreatment process, avoids the interference of organic solvents, and reduces contamination of the chromatographic column and injection port.

II. Principles of Headspace Sampler

The working principles of the headspace sampler are mainly divided into two types: solution headspace and solid headspace.

  • Solution Headspace: The sample is dissolved in an appropriate solvent and placed in a headspace vial, which is then heated for a certain period to allow the residual solvent to reach equilibrium in the gas-liquid phases. Subsequently, a quantitative amount of gas is sampled for measurement.
  • Solid Headspace: The solid sample is directly placed in the headspace vial and heated for a certain period to allow the volatile components to reach equilibrium in the gas-solid phases. Afterwards, a quantitative amount of gas is sampled for measurement.

III. Usage Methods

Preparation Stage:

  1. Accurately transfer the sample to the headspace vial and seal it.
  2. Place the headspace vial in the heating oven and allow it to equilibrate for the preset time.

Parameter Setting:

  1. Set parameters such as heating temperature of the headspace vial, temperature of the quantitative tube, and temperature of the transfer line as needed.
  2. Ensure that the headspace sampler is correctly connected to the gas chromatograph, and set the appropriate carrier gas flow rate and split ratio.

Sampling Operation:

  1. Use the pressure method or equilibrium method to introduce the headspace gas into the gas chromatograph.
  2. After starting the sampling, wait for the sample peak to finish, press the cleaning button to clean, and then proceed with the next sample.

Data Analysis:

  1. Analyze the data obtained from the gas chromatograph to calculate the composition and content of volatile components in the sample.

IV. Common Faults and Repair Methods

Unable to Sample Normally:

  • Fault Causes: Insufficient pressure, valve failure, sealing issues, clogged sampling needle.
  • Repair Methods: Check the gas source pressure, clean or replace the valve, replace sealing components, clean the sampling needle, and ensure it is dry before reinstallation.

Gas Leakage:

  • Fault Causes: Loose connections or aged sealing components.
  • Repair Methods: Check the tightness of connections, replace aged or damaged sealing components, and apply sealing glue if necessary to enhance sealing.

Inaccurate Sampling Volume:

  • Fault Causes: Clogged sampling needle, stuck or leaky valve.
  • Repair Methods: Regularly clean the sampling needle, calibrate the sampling volume, and inspect and address valve faults.

Slow Sampling Speed:

  • Fault Causes: Insufficient gas source pressure, clogged sampling needle, stuck valve.
  • Repair Methods: Check and repair the gas source pressure issue, clean the sampling needle, and address the stuck valve problem.

Other Mechanical Faults:

  • For mechanical faults such as rusted lifting rods, follow the equipment manual or disassembly videos provided by technical support to disassemble, remove rust, lubricate, and reinstall.

V. Conclusion

As an important tool in gas chromatographic analysis, the headspace sampler is widely used in various fields due to its efficiency and convenience. Correctly understanding and operating the headspace sampler, as well as promptly addressing common faults, are crucial for ensuring the accuracy and efficiency of experimental results. This article summarizes the basic principles, usage methods, and common fault repair methods of the headspace sampler, aiming to provide comprehensive reference and guidance for users.

VI. Brands and Models of Headspace Samplers Repaired by Longi Electromechanical Company

  1. Agilent Technologies
    • 7697A: Headspace Sampler
    • 7650A: Automatic Headspace Sampler
    • 7694E: Headspace Sampler
  2. PerkinElmer
    • TurboMatrix Series: TurboMatrix 40, TurboMatrix 110, TurboMatrix 16, TurboMatrix 650 ATD, TurboMatrix 350 ATD
  3. Thermo Fisher Scientific
    • TriPlus Series: TriPlus 300 HS, TriPlus 500 HS, TriPlus 100 LS
  4. Shimadzu
    • HS-20 Series: HS-20, HS-10
  5. GERSTEL
    • MultiPurpose Sampler (MPS): Integrates headspace, solid-phase microextraction (SPME), and other multifunctional sampling
    • Dual Headspace Sampler: Efficient multi-sample sampling
  6. CTC Analytics (PAL System)
    • PAL RSI: Robotic Sample Injector with headspace option
    • PAL RTC: Robotic Tool Change system with headspace option
  7. Teledyne Tekmar
    • HT3: Headspace Autosampler
    • Versa: Automated Headspace Vial Sampler
  8. LECO Corporation
    • PEGASUS HT-C: Headspace Sampler
    • HTS: High Throughput Sampler
  9. Markes International
    • CIA Advantage: High-capacity headspace autosampler
  10. EST Analytical
    • Evolution: Automated Headspace Sampler
  11. OI Analytical (Xylem)
    • 4560: Purge-and-Trap Sample Concentrator with headspace option
  12. Alpha MOS
    • HS100: Headspace Autosampler
  13. Dani Instruments
    • Master DHS: Dynamic Headspace Sampler
    • Master SHS: Static Headspace Sampler
  14. Entech Instruments
    • 7100A: Preconcentrator with headspace option
  15. Horizon Technology
    • SmartPrep: Automated Extraction System with headspace option

Longi Electromechanical Company has nearly 30 years of experience in repairing headspace samplers and can quickly repair various instruments. Additionally, the company recycles and sells various headspace samplers. Welcome to consult.

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Air Sampler Overview, Principle, Usage Method, and Troubleshooting Summary

Air Sampler Overview

Air samplers are crucial environmental monitoring tools widely used in fire预警, air quality monitoring, and industrial waste gas emission detection. These devices utilize specific suction mechanisms to draw air samples from the environment into the equipment, where various pollutants in the air are separated and detected using physical or chemical methods. This provides vital data support for environmental protection, fire预警, and industrial production.

Principle

The basic principle of an air sampler involves utilizing an internal suction pump or power system to draw air samples from the detection area through air sampling tubing into a detection chamber. Inside the chamber, high-precision sensors and separation techniques are employed to convert pollutants in the air into measurable substances, which are then quantitatively analyzed by the analysis system. This process requires the equipment to possess high accuracy and stability, as well as adaptability to various complex environmental conditions.

Usage Method

Preparation:

  • Inspect the instrument for any damage, ensuring the sampling device, analysis system, power supply, etc., are functioning properly.
  • Confirm the cleanliness of the sampling device to avoid contamination.

Parameter Setting:

  • Set the parameters of the sampling device according to the types and concentration ranges of pollutants to be detected, such as sampling time and flow rate.

Installation of Sampling Device:

  • Connect the sampling head of the sampler to the sampling point, ensuring a tight connection and avoiding interference from other objects.
  • Avoid exposing the sampling head to high-humidity environments.

Sampling Initiation:

  • Press the start button on the sampler to begin sampling.
  • Maintain a stable environment at the sampling point to avoid interference with sampling results.

Sampling Completion:

  • The sampling device will automatically stop working according to the set sampling time.
  • Disconnect the sampling device from the sampling point and turn off the sampler.
  • Promptly clean and disinfect the sampling device to prevent the spread of contamination.

Data Analysis:

  • Send the collected samples to a laboratory for analysis to obtain pollutant concentration data.
  • Use appropriate analysis methods (e.g., chromatography, mass spectrometry) to interpret and apply the data.

Troubleshooting and Repair Methods

  • Display Screen Not Working:
    • Possible causes: Poor power contact or damaged display screen.
    • Solution: Check power connection and replace damaged components.
  • Pump Not Working:
    • Possible causes: Pump stuck or circuit failure.
    • Solution: Clean or replace the sampling pump, check and replace the circuit board.
  • Backflow Phenomenon:
    • Possible causes: Operational error leading to absorption liquid being sucked into the instrument.
    • Solution: Disconnect the connection, clean the air path with anhydrous ethanol, and let the pump run idle to evaporate residual liquid.
  • No or Reduced Bubble Flow Rate:
    • Possible causes: Leakage causing the gauge pressure to be lower than normal.
    • Solution: Check the pipeline and drying cylinder for leaks and repair promptly.
  • Flowmeter Float Not Moving:
    • Possible causes: Float stuck due to liquid intake.
    • Solution: Clean or replace the flowmeter.

Brands and Models of Air Samplers Repaired by Longi Electromechanical

  1. SKC Inc.:
    • AirChek Series: AirChek TOUCH, AirChek Essential, AirChek XR5000
    • PCXR Series: PCXR4, PCXR8
    • Universal Series: Universal XR
    • Leland Legacy: High-flow air sampling pump
  2. Gilian (Sensidyne):
    • GilAir Series: GilAir Plus, GilAir 5, GilAir 3, GilAir 2
    • Gilian BDX-II: Low-flow air sampling pump
    • Gilian LFS-113: Low-flow air sampling pump
  3. TSI Incorporated:
    • AeroTrak Series: AeroTrak 9306, AeroTrak 9310, AeroTrak 9350
    • DustTrak Series: DustTrak II 8530, DustTrak DRX 8533
  4. Casella:
    • VAPex Series: VAPex Pro, VAPex Elite
    • Apex2 Series: Apex2, Apex2 Plus, Apex2 Pro
  5. Thermo Fisher Scientific:
    • TEOM Series: TEOM 1405, TEOM 1400ab
    • Partisol Series: Partisol 2000i, Partisol 2025i
  6. APEX Instruments:
    • XC-6200 Series: XC-6200
    • XC-6000 Series: XC-6000
    • XC-5000 Series: XC-5000
  7. Buck Libra (A.P. Buck):
    • Buck Libra Series: Buck Libra Plus LP-5, Buck Libra Plus LP-7, Buck Libra Plus LP-12
  8. Zefon International:
    • Escort ELF: High-flow air sampling pump
    • Bio-Pump Plus: Biological air sampling pump
  9. Hi-Q Environmental Products Company:
    • CF-1001: Large-flow air sampler
    • CF-902: Environmental air sampler
  10. Sibata:
    • MP-Sigma: Personal air sampling pump
    • MP-Σ100N: Low-flow air sampling pump
  11. GASTEC Corporation:
    • GV-110 Series: GV-110S, GV-110R
  12. BioStage (EAA, Inc.):
    • BioStage Impactor: Air microorganism sampler
  13. AirSamplers.com:
    • APB Series: APB-350, APB-360
  14. Advanced Instruments:
    • Zefon Escort: High-flow air sampling pump
    • Zefon Bio-Pump: Biological air sampling pump
  15. Interscan Corporation:
    • LD Series: LD-3, LD-4

Longi Electromechanical Company has nearly 30 years of experience in repairing headspace samplers. We can quickly repair various instruments and also recycle and sell various headspace samplers. Welcome to consult.