ppm/ppb Moisture Analyzer(P2O5, ATEX)



Moisture in Gas

The trace moisture analyzer is suitable for stable and continuous trace moisture measurement in strongly corrosive acidic gases and most neutral gases.


Electrolysis principle for trace moisture measurement in gas was successfully tested and applied to trace moisture measurement by Keide in 1959. This method provides a continuous industrial measurement solution for trace moisture in non-alkaline gases, which can continuously, online and real-time monitor the trace moisture in various industrial processes.

Working principle

The sensor are plated with parallel platinum layers or wound parallel platinum wires, the platinum wires are coated with a hydrated phosphorus pentoxide film(P2O5). When the gas passes through the electrolytic cell, all of the water is absorbed and and generates phosphoric acid. At the same time, the DC voltage between the platinum wires causes the phosphoric acid to produce an electrolytic reaction to decompose oxygen, hydrogen and phosphorus pentoxide. When the absorption and electrolysis reach a balance, the water entering the electrolytic cell is all absorbed by the phosphorus pentoxide film and then electrolyzed completely. According to Faraday's law of electrolysis and gas law, the absolute value of moisture in a gas sample can be directly measured according to the electrolysis current.


▲Corrosive gas: PVDF electrolytic cell,   Non-corrosive gas: PVDF or SS stainless steel electrolytic cell

▲The sample gas pressure can reach 3Bar(PVDF)/10Bar(SS)

▲Stable sample gas flow rate 20Nl/h or 100Nl/h

▲Three-way valve and four-way valve operation, convenient for sensor maintenance and recoating

▲Slight positive pressure protection of compressed air in the sampling unit

▲Filter can be used for unclean gases

▲Electric heating regulator can be used for liquid chlorine evaporation

▲Vacuum pump can be used for the vacuum sample gas

▲The sample gas outlet is recommended to be discharged into the exhaust gas treatment equipment


★Chlor-alkali chemical, PVC chemical industry: Trace moisture measurement in chlorine gas, liquid chlorine, hydrogen chloride, sulfur dioxide;

★Fluorine chemical industry: Trace moisture measurement in hydrogen fluoride;

★Polysilicon, organic silicon industry: Trace moisture measurement in chlorine, hydrogen chloride, silicon tetrachloride;

★Natural gas and petrochemical industry: Trace moisture measurement in natural gas, hydrogen, acetylene and other hydrocarbon gases;

★Gas industry, ASU(Air Separation Unit): Trace moisture measurement in oxygen, nitrogen, carbon dioxide, argon or other rare gases

★Freezer, Compressor: Trace moisture measurement in process gas;

Electricity:Trace moisture measurement in SF6;



• Zirconia ceramic or glass material is optional. The movable construction of electrolytic cell is easy disassembly and maintenance.


• Quick and convenient

    The navigation menu contains 6 languages, which can be operated easily.

• Process safety

    4.3" or 7" large size color LCD touch screen, convenient and safe touch operation and debugging

    Large size screen with red flashing alarm, clearly visible from long distances and in dark areas

    Alarm immediately, safe the process    

Alarm event record

    Real-time data curve display

    Record function for up to 6000 alarms

• Expert calibration function

   Multi-point calibration function up to 9 point

• Powerful self-diagnosis function

    Built-in flow status monitoring or mass flow measurement and controller

    Built-in heartbeat monitoring function and watchdog

    Monitor the status of controllers and sensors, and promptly remind customers to take necessary maintenance

    High-standard hardware and software security and password protection

• Powerful control function

    High(low) limit control function

    Optional: Timer control(automatic cleaning) function

    Optional: analog PID controller

    Optional: PWM controller

• Flexible fieldbus communication functions for IOT4.0

    Optional fieldbus MODBUS, HART, Foundation Fieldbus FF, PROFIBUS PA, PROFIBUS DP, etc.


• ATEX EExd II CT4 Optional

Some application case:

▲Trace moisture measurement in chlorine at the inlet of the chlorine compressor to protect the chlorine compressor.

Trace moisture measurement in chlorine at the outlet and the final outlet of the chlorine compressor to protect the chlorine compressor.

▲Monitor the leakage of the precooler to protect the chlorine compressor.

▲Monitor the accuracy of the dew point analyzer at the outlet of the freezer.


Measurement components and ranges

• H2O:         0~2,000ppm(Max.6000ppm) or 500ppm or 0~20,000ppb

                    Display range0~6,000ppm

Measurement unit can be ppm Volume, or ppm Weight which is based on the gas molar weight!

Product datasheet: ppm/ppb Mositure Analyzer(Trace Moisture in Gas),SMART-MT , if you need more information, please contact us at info@mzdd.de.

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