Trace Oxygen Analyzer: Principles, Brands & Models, Usage, and Troubleshooting Guide

I. Classification of Trace Oxygen Analyzer Principles

Trace oxygen analyzers are crucial tools for detecting minute amounts of oxygen in the environment. Their principles are mainly categorized into fuel cell and zirconia methods.

1. Fuel Cell Trace Oxygen Analyzer

• Principle: Utilizes a fully sealed fuel cell oxygen sensor consisting of highly active oxygen and lead electrodes immersed in a KOH solution. Oxygen molecules in the sample gas diffuse through a polymer membrane to the oxygen electrode, where they undergo an electrochemical reaction. The generated current is proportional to the oxygen content in the sample gas.
• Advantages: Maintenance-free, stable and reliable sensor, no need for regular cleaning or replacement.

2. Zirconia Trace Oxygen Analyzer

• Principle: Employs a zirconia element as the key component of the oxygen detection cell. At high temperatures, oxygen diffuses from the side with higher partial pressure to the side with lower partial pressure, creating a potential difference, which is used to measure oxygen content.
• Advantages: Wide measurement range, easy to use, long service life.

II. Usage Instructions

1. Instrument Startup: Ensure the portable trace oxygen analyzer is in normal working condition.
2. Mobile Detection: Hold the antioxidant and corrosion-resistant detection rod to measure the concentration of trace oxygen gas in the environment.
3. Data Recording: Utilize the instrument’s storage and memory function to record data per second during detection, facilitating subsequent query and computer printing.

III. Common Faults and Troubleshooting Methods

1. No Response to Sample Gas
   • Cause: Sensor failure.
   • Repair Method: Check instrument connections for normality or replace the sensor.
2. No Display on Instrument
   • Cause: Fuse burnout or circuit failure.
   • Repair Method: Replace the fuse or send to a professional repair center.
3. Slow Response or Poor Linearity
   • Cause: Sensor aging, presence of liquids or dust, gas path leakage.
   • Repair Method: Replace the sensor, clean the pipelines, or repair the leakage.
4. No Indication on Flowmeter
   • Cause: Filter at the inlet is blocked or internal pipelines are clogged.
   • Repair Method: Check the filter screen or send the instrument back to the manufacturer for repair.
5. High or Low Indication
   • Cause: Signal drift, presence of other interfering gases, inaccurate sensor calibration, gas path leakage.
   • Repair Method: Recalibrate the instrument, filter out other interfering gases, check and repair gas path leakage, replace the sensor.
6. Garbled Display
   • Cause: Strong external power interference or instrument detection program issues.
   • Repair Method: Add a purified power supply stabilizer or send the instrument to a professional repair center.
7. Internal Instrument Fault
   • Cause: Associated with fault codes.
   • Repair Method: Refer to the fault code instructions in the instrument manual for targeted troubleshooting.
8. Power Issues
   • Cause: Poor power cord connection or faulty power socket.
   • Repair Method: Check power cord connection and power socket, and conduct professional repair if necessary.
9. Ambient Temperature Changes
   • Cause: Large ambient temperature changes, sensor aging or contamination.
   • Repair Method: Avoid using the instrument in environments with large temperature changes, regularly replace or clean the sensor.

IV. Longi Ectromechanical Company Repair Services

Longi Ectromechanical Company, with nearly 30 years of experience in trace oxygen analyzer repair, can quickly repair various types of instruments. The company also offers services for recycling and selling various used analyzers. Below are some of the brands and models that have been repaired:

• Process Insights: MTO2-2000, ZIRCOMAT, OXYMAT 6
• ADEV: G1501, OXY ONE, OXY CHECK, OXY MANAGER
• Pittcon Instruments: POA200, 209 Series, Model 211, Model 212
• In-Situ: EN-500, RDO PRO-X, Aqua TROLL 600, TROLL 9500
• Servomex: SERVOPRO MultiExact 4100, SERVOPRO MonoExact DF310E, SERVOPRO 4900 Multigas, SERVOPRO NanoChrome
• Teledyne Analytical Instruments: 3000TA, 3000T Series, 3000MB Series, 3000MA
• AMETEK: 2000H, 3000TA, 3000MA, ta7000
• Michell Instruments: XZR400, XZR500, XTP601, XZR200
• Systech Illinois: EC900, EC923, EC91, EC92DIS
• Mettler-Toledo: Thornton 499AO, 5900 Series, 5500 Series, 4900 Series
• Yokogawa: ZR22, ZR202, ZR402, AV550G
• Delta F Corporation: DF-150E, DF-500, DF-560E, DF-745
• Analytical Industries Inc. (AII): GPR-1500, GPR-2500, GPR-3100, GPR-4100
• GE Analytical Instruments: Oxy.IQ, Oxy.IQ II

For trace oxygen analyzer repair services, please contact Longi Ectromechanical Company.