Tag: Repair Methods

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Potentiometric Analyzers: Common Faults, Maintenance, and Specifications

Potentiometric Analyzers (e.g., Zeta Potential Analyzers) in Laboratory and Industrial Applications: Common Faults and Maintenance

I. Common Faults and Repair Methods

  1. No Power, Power Indicator Not Lit
    • Fault Causes:
      • Main power circuit breaker tripped.
      • Power fuse blown.
      • Indicator light damaged.
    • Repair Methods:
      • Check for short circuits in the device and reset the circuit breaker.
      • Replace the fuse or indicator light.
  2. Abnormal Output Voltage and Current, C1 Potential Indicator Drops
    • Fault Causes:
      • Insulating flange short-circuited.
      • Short-circuited with other underground metal structures.
      • Reference electrode damaged.
    • Repair Methods:
      • Repair the short-circuited insulating flange and disconnect from underground metal structures.
      • Check the reference electrode measurement wire or replace the reference electrode.
  3. Increased Noise
    • Fault Causes:
      • Uneven placement of the case.
      • Poor contact of the main relay.
      • Loose bolts on the main transformer or filter reactor.
    • Repair Methods:
      • Level the case.
      • Replace the main relay.
      • Tighten loose bolts.
  4. Fault Light On
    • Fault Causes:
      • Test conversion jump.
      • Open circuit in anode or cathode bus cable.
      • Open circuit or failure in reference electrode cable.
    • Repair Methods:
      • Press the reset button.
      • Check the anode or cathode bus cable.
      • Check the reference electrode cable or replace the reference electrode.
  5. Open Circuit in Cathode Line
    • Diagnosis:
      • Use a ZC-8 ground resistance tester to measure the grounding resistance of the anode cable. After confirming the normality of the anode cable, use a multimeter to test the continuity between the output cathode and the zero-position grounding cable to determine if there is an open circuit.
    • Repair Method:
      • Replace the open-circuited output cathode cable.
  6. Open Circuit in Reference Line or Zero-Position Grounding Line
    • Diagnosis:
      • Disconnect and measure the potential using a long-lasting reference electrode placed directly above it, or test the resistance value between these two lines to determine their integrity.
    • Repair Method:
      • Replace the open-circuited cable or reference electrode.
  7. Damaged Reference Electrode or Empty Cupric Sulfate Solution
    • Diagnosis:
      • Use a calibrated standard reference electrode placed as close as possible to the long-lasting reference electrode and use a multimeter to test the potential difference to determine if it falls within the acceptable range.
    • Repair Method:
      • Replace the long-lasting reference electrode or replenish the cupric sulfate solution.

II. Daily Maintenance Considerations

  • Regular Calibration: If performing acid-base titration to determine the isoelectric point or pH value, calibrate the pH probe before each experiment. If testing solution conductivity, calibrate the conductivity probe. The main probe can be calibrated weekly.
  • Cleaning: Clean the main probe, pH probe, and container after each sample change, and dry them to avoid residue affecting experimental results. Thoroughly clean and properly store them after experiments.

III. Potentiometric Analyzers Repaired by Longi Ectromechanical Company and Their Specifications

  1. Metrohm (Switzerland)
    • 905 Titrando: High-precision potentiometric titrator suitable for various complex samples with automation and modular design for laboratory and industrial applications.
    • 888 Titrando: Multi-functional potentiometric titrator supporting multiple titration methods with high precision and reliability for a wide range of applications.
  2. Mettler-Toledo
    • T50: Multi-functional titration system with high precision and user-friendly interface for routine laboratory analysis and research applications.
    • T90: High-end potentiometric titrator offering flexible automation options and advanced data management features for complex and high-demand analysis tasks.
  3. Thermo Fisher Scientific
    • Orion Star T940: High-performance potentiometric titrator with intuitive user interface and multiple titration modes for various electrochemical analyses.
    • Orion Versa Star Pro: Potentiometric titrator providing high-precision potential measurements and multiple titration functions for research and quality control.
  4. Hanna Instruments
    • HI902C: Fully automatic potentiometric titrator with high precision and multi-functionality for a wide range of applications, including food, beverage, and chemical analysis.
  5. Hach
    • AT1000: Fully automatic potentiometric titrator designed for high-precision titration analysis, suitable for water quality analysis and other industrial applications.
  6. SCHOTT Instruments
    • TitroLine 7800: High-end potentiometric titrator with automation and high-precision titration functions for complex analysis tasks in the pharmaceutical, chemical, and food industries.
  7. Malvern Panalytical
    • Zetasizer Nano ZS: High-performance Zeta potential and particle size analyzer for the characterization of nanoparticles, colloids, and proteins with high sensitivity and multi-functionality.
    • Zetasizer Ultra: Provides higher resolution and accuracy for measuring particle size, Zeta potential, and molecular weight, suitable for complex sample analysis.
  8. Anton Paar
    • Litesizer 500: Multi-functional analyzer for measuring particle size, Zeta potential, and molecular weight with high precision and easy-to-use interface for various applications.
  9. Brookhaven Instruments
    • ZetaPALS: High-sensitivity Zeta potential analyzer suitable for sample measurements in low-concentration and high-salt environments, widely used in research and industrial fields.
    • NanoBrook Omni: Comprehensive particle size and Zeta potential analyzer with high precision and reliability for the characterization of various nanomaterials and colloids.
  10. Beckman Coulter
    • DelsaMax PRO: Fast and high-precision Zeta potential analyzer capable of simultaneously measuring particle size and Zeta potential, suitable for high-throughput research and industrial applications.
  11. Horiba
    • SZ-100: Multi-functional nanoparticle size and Zeta potential analyzer with high sensitivity and ease of operation, suitable for research in materials science and life sciences.
  12. Particle Metrix
    • Stabino: Automated Zeta potential analyzer for quick and precise measurement of Zeta potential, suitable for the characterization of colloids and nanomaterials.

Longi Ectromechanical Company has nearly 30 years of experience in repairing potentiometric analyzers and can quickly repair various instruments. Additionally, we recycle and sell used potentiometric analyzers. Please feel free to contact us for more information.

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Comprehensive Guide to Particle Size Analyzer Faults, Repairs, and Preventive Measures

Particle Size Analyzer (Also known as: Particle Size Tester, Automatic Laser Particle Size Tester, Laser Particle Size Analyzer, Laser Particle Size Tester, Nano Image Particle Size Analyzer, Mean Particle Size Determinator, Particle Size Determinator, Spray Particle Size Tester, Particle Diameter Analyzer)

I. Common Fault Conditions and Troubleshooting

1. Instrument Running Unstably or Stopping:

  • Possible Cause: Power supply issues or internal component damage.
  • Solution: Check for stable power supply connection and inspect internal components for damage.

2. Laser Not Working or Unstable Light Intensity:

  • Possible Cause: Laser source malfunction or improper adjustment.
  • Solution: Check power connection and adjust potentiometer of the laser source; clean the laser surface.

3. Unable to Start or Connect to Computer:

  • Possible Cause: Power cord not properly plugged in or driver/software issues.
  • Solution: Check power cord, reinstall drivers or software, and ensure connection lines are normal.

4. Inaccurate or Deviated Measurement Results:

  • Possible Cause: Improper sample handling or incorrect instrument parameter settings.
  • Solution: Ensure uniform sample distribution and check/adjust instrument parameters such as laser power and scattering angle.

5. Slow Measurement Speed:

  • Possible Cause: High sample concentration or unclean internal optical path.
  • Solution: Select appropriate sample concentration and regularly clean the optical path.

6. Display Screen Abnormality or Error:

  • Possible Cause: Display screen malfunction or system error.
  • Solution: Attempt to restart the instrument or perform a system reset; refer to the user manual or contact technical support.

7. Abnormal Measurement Due to Improper Sample Handling:

  • Possible Cause: Uneven sample distribution, insufficient settlement, or blockage of sample inlet/outlet.
  • Solution: Adequately stir or shake the sample; check and clean the sample inlet and outlet.

8. Data Processing Software Error:

  • Possible Cause: Software incompatibility with the instrument or incorrect settings.
  • Solution: Reinstall or update the software; check settings of the data processing software and calculation formulas.

II. Repair Methods

1. Power Supply Issues:

  • Check if the power cord is tightly plugged in; check for stable power supply voltage, and replace the power socket or use a voltage stabilizer if necessary.

2. Sample Issues:

  • Ensure the sample meets instrument requirements; adequately stir the sample to ensure uniformity; filter to remove impurities.

3. Optical Component Contamination:

  • Use dedicated cleaning agents and tools to clean optical components; handle with care to avoid scratches.

4. Mechanical Component Failures:

  • Check for loose or damaged mechanical components; promptly replace or repair relevant components; ensure safe operation.

5. Software Failures:

  • Attempt to restart the instrument; if the problem persists, contact the manufacturer or professional repair personnel for software updates or repairs.

III. Preventive Measures

  • Regular Cleaning and Maintenance: Keep the instrument surface and interior clean of impurities; regularly clean the optical path.
  • Sample Pretreatment: Ensure a dust-free sample handling process; avoid sample clumping or aggregation.
  • Software Updates: Regularly update the instrument software version to ensure stability and compatibility.
  • Environmental Control: Maintain a stable instrument working environment; avoid influences of temperature, humidity, and other factors on measurement results.

By adopting these measures, the occurrence of faults in particle size analyzers can be effectively reduced, and their measurement accuracy and stability can be improved. For unresolvable faults, it is recommended to promptly contact the professional repair personnel of Longi Ectromechanical Company for assistance.

IV. Brands and Models of Particle Size Analyzers Repaired by Longi Ectromechanical Company

Malvern Panalytical

  • (1) Mastersizer 3000: A laser diffraction particle size analyzer with high precision and rapid measurement capabilities, suitable for various sample types, including wet and dry samples.

Beckman Coulter

  • (1) LS13320: Covers a wide range of particle sizes and efficiently analyzes the particle size distribution of various materials, suitable for research and industrial applications.

Horiba

  • (1) LA-960: Features high resolution and sensitivity, suitable for measuring particles from nanometer to millimeter scale, widely used in chemical, pharmaceutical, and materials science fields.

Sympatec

  • (1) HELOS: Provides high-resolution and precise particle size measurements, suitable for various industrial applications, especially in the pharmaceutical and food industries.

Microtrac

  • (1) Bluewave: Adopts triple laser technology, providing extensive particle size distribution measurements from nanometer to millimeter scale, suitable for research and development as well as quality control.

Anton Paar

  • (1) PSA Series (PSA 1190, PSA 1090): Utilizes laser diffraction technology, offering high precision and reproducibility in particle size measurements, suitable for various industrial and academic research applications.

Cilas

  • (1) Cilas 1190: Adopts advanced optical design, capable of accurately measuring a wide range of particle size distributions, suitable for materials science, pharmaceuticals, and chemicals.

OMEC (OuMeiKe)

  • (1) LS-POP6
  • (2) LS-609
  • (3) LS-609M
  • (4) LS-609Q
  • (5) LS900
  • (6) Easysizer20
  • (7) PAMS 2000
  • (8) LPSA-1

Mettler-Toledo

  • (1) ParticleTrack G400
  • (2) ParticleTrack E25
  • (3) EasyViewer 100
  • (4) Lasentec FBRM D600L

BaiTe: BeNano90
HaiXinRui: HL2020-C
DLS: WLP-206

Longi Ectromechanical Company specializes in the long-term repair of particle size analyzers, with nearly 30 years of experience. We can quickly repair various types of instruments. Additionally, we recycle and sell various used particle size analyzers. Welcome to consult with us.

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Repair Methods and Maintenance of Thermal Conductivity Instruments: Addressing Common Faults and Ensuring Accuracy

Thermal Conductivity Instruments (Including Laser Thermal Conductivity Tester, Flash Thermal Conductivity Tester, Thermal Reflectance Thermal Conductivity Tester, Thermal Conductivity Coefficient Tester, etc.) Play a Vital Role in Material Research and Testing, But May Encounter Various Faults During Use. Below Are Some Common Fault Scenarios and Corresponding Repair Methods:

I. Common Fault Scenarios

1. Unstable Readings or Display Errors

  • Possible Causes: Connection issues, sensor contamination, incorrect sample installation, unstable environmental conditions (e.g., temperature and humidity fluctuations).
  • Repair Methods: Check and reconnect the device, clean the sensor, ensure correct sample installation, and stabilize environmental conditions.

2. Readings Too High or Too Low

  • Possible Causes: Poor thermal contact, incorrect input of sample thickness or dimensions, instrument not properly calibrated.
  • Repair Methods: Ensure good thermal contact between the sample and sensor, verify and correctly input sample parameters, and calibrate according to the manufacturer’s guidelines.

3. Slow Heating or Cooling Rates

  • Possible Causes: Faulty heating or cooling elements, improper power and control settings, maintenance required.
  • Repair Methods: Check the working status of heating or cooling elements, adjust power and control settings, and perform necessary cleaning or replacement of parts.

4. Readings Affected by External Interference

  • Possible Causes: Electromagnetic interference, vibration, light interference.
  • Repair Methods: Place the instrument in a light-shielded, vibration-free, and low-electromagnetic interference environment, and use shielding materials or isolation measures to reduce interference.

5. Software Operation Difficulties

  • Possible Causes: Unfamiliarity with software functions, improper operation.
  • Repair Methods: Thoroughly read the user manual or operation guide, contact Longi Ectromechanical Company for technical support, and attend training courses to improve operational skills.

6. Hardware Faults

  • Possible Scenarios: Switch knob not fully rotated, copper wire desoldered, battery box wire broken, circuit board failure, laser head not emitting light, etc.
  • Repair Methods: Inspect the hardware components such as switch knobs, copper wire soldering, battery box wires, and circuit boards, and repair or replace as necessary.

7. Light Source or Detector Faults

  • Possible Causes: Unstable light source intensity, damaged detector.
  • Repair Methods: Regularly check the working status of the light source and detector, and replace promptly if issues are found.

8. Data Acquisition System Faults

  • Possible Causes: Hardware or software faults in the data acquisition system.
  • Repair Methods: Check the working status of the data acquisition system and repair or replace if necessary.

II. Repair Method Summary

Basic Checks:

  • Inspect device connections, power supply, sensors, and sample installation.
  • Ensure stable environmental conditions (e.g., temperature and humidity).

Calibration & Adjustment:

  • Regularly calibrate the instrument following the manufacturer’s guidelines.
  • Adjust instrument settings to ensure correct measurement parameters.

Hardware Maintenance:

  • Clean sensors, heating or cooling elements, and other critical components.
  • Inspect and repair or replace damaged hardware, such as copper wires, wires, and circuit boards.

Software & Operation:

  • Thoroughly read user manuals and operation guides to ensure correct software operation.
  • Contact the manufacturer or technical support for assistance if needed.

Preventive Maintenance:

  • Regularly inspect the working status of all device components and perform necessary maintenance and replacements.
  • Establish maintenance records to track the usage status and repair history of the equipment.

Environmental Control:

  • Ensure the device operates under stable environmental conditions and avoid external interference.

By implementing these repair methods, the accuracy and reliability of thermal conductivity instruments in material research and testing can be ensured, improving the precision of measurement data.

III. Brands and Models of Thermal Conductivity Instruments Repaired by Longi Ectromechanical Company

  1. NETZSCH (Germany)
    • LFA467HT (LFA 467 HyperFlash)
    • LFA 447 NanoFlash
    • LFA 457 MicroFlash
  2. TA Instruments (USA)
    • DLF1200
    • DLF1600
    • DLF2800
  3. Linseis Thermal Analysis (Germany)
    • LFA1000
    • LFA500
  4. Thermophysical Instruments (Japan)
    • TC1200
    • TC7000
  5. C-Therm Technologies (Canada)
    • TCi Thermal Conductivity Analyzer
    • Trident Thermal Conductivity Analyzer
  7. KEM (Japan), Quick Thermal Conductivity Tester
    • QTM-500
    • QTM-710
    • QTM-700
    • TPS2500S
  8. Xiangtan Xiangyi Instrument (China)
    • LFA 4000
    • LFA 2000
    • DRH-300
    • DRH-ZD-300
    • DRH-400
    • DRH-ZD-400
    • DRH-600
    • DRH-ZD-600
    • DRE-2A
    • DRE-2B
    • DRE-2C
    • DRE-2D
    • DRE-2E
    • DRE-2D (duplicated, possibly an error)
    • DRE-2G
  9. Phoenix Laser Thermal Conductivity Instruments (China)
  10. CORE EU
  11. Hangtian Ruibo

Longi Ectromechanical Company has nearly 30 years of experience in repairing thermal conductivity instruments (including laser thermal conductivity testers, flash thermal conductivity testers, thermal reflectance thermal conductivity testers, and thermal conductivity coefficient testers). We can quickly repair various types of instruments. Additionally, we recycle and sell used thermal conductivity instruments. Please feel free to contact us for more information.