Michell Instruments Condumax II

Hydrocarbon Dew-point Analyzer

Envent is working in partnership with Michell Instruments to provide a more comprehensive product offering of online process instruments designed specifically for measuring hydrocarbon moisture in Natural Gas. The Condumax II Hydrocarbon Dew-Point Analyzer by Michell Instruments is designed to provide automatic, on-line measurement of hydrocarbon and water dew-point in Natural Gas.


  • Features
    • Fully automatic on-line analysis
    • Objective, highly repeatable measurement
    • 0.5°C (0.9°F) hydrocarbon dew-point accuracy
    • Fundamental chilled mirror measuring principle
    • Patented detection technique
    • Self-cleaning
    • No purge or cooling gas needed
    • Optional water dew-point analysis available
    • Modbus RTU
    • IEC/Ex, ATEX, cCSAus and GOST EX certifications
    • Built-in verification of customer process gas
    • Intuitive, 4.3″ LCD display with touch pad operation. No “hot work” permit required
    • Class I, Division 1 certified for hazardous areas
    • Integrated sampling conditioning system
    • 40 years of expertise in moisture measurement built into the design.
  • Downloads
  • Certification

    For any certification documentation please make a request through the contact us form. 

  • Applications
    • Natural gas processing
    • Protection of turbo-expander plant
    • Gas quality measurements at custody transfer
    • Transmission pipeline monitoring
    • Confirmation and control of fuel gas ‘super-heat’ to turbine powerplant
  • Specifications

    Hydrocarbon Dew-Point Measurement

    Measurement Technique Dark Spot™ fixed sample analysis. Direct photo-detection of hydrocarbon dew-point temperature
    Sensor Cooling Automatic via 3-stage Peltier effect electronic cooler uner adaptive control
    Measurement Range Up to Δ -55K measurement depression from Main Unit operating temperature
    Accuracy ±0.5°C hydrocarbon dew-point (single and multiple condensable component analysis)
    Sample Flow 0.03m3/hr (0.5 NI/min) – alarm standard
    Measurement Frequency 6 cycles/hour (recommended)
    12 cycles/hour (maximum)
    Operating Pressure Max 100 barg (1450 psig)

    Pressure Measurements

    Units MPa, barg, psig
    Resolution 0.1 MPa and barg, 1 psig
    Range HC dew-point: 0 to 100 barg (0 to 1450 psig)
    Water dew-point: 0 to 200 barg (0 to 2900 psig)
    Accuracy ±0.25% FS

    Water Dew-Point Measurement (optional)

    Measuring Technique Michell Ceramic Moisture Sensor
    Units-Moisture Content °C and °F water dew-point; lbs/MMscf; mg/m3; ppmv
    Resolution 0.1°C, 0.1°F
    Range (dew-point) Calibrated from -100 to +2°C (-148 to +68°F)
    Accuracy (dew-point) ±1°C (1.8°F) from -59 to +20°C (-74 to +68°F)
    ±2°C (3.6°F) from -100 to +68°C (-148 to +154°F)
    Sample Flow 0.06 to 0.3 m3/hr (1 to 5 NI/min) – alarm standard
    Temperature Coefficient Algorithm compensation (-20 to +50°C)
    Operating Pressure Max 138 barg (2000 psig)

    Hydrocarbon Dew-Point Analyzer

    Resolution Hydrocarbon and water dew point: 0.1°C (0.18°F)
    Sample Gas Supply Natural gas up to 100 barg (1450 psig), pressure regulated in sampling system
    Sample Gas Connections 1/8″ NPT (ATEX / IECEx) or 1/4″ NPT (CSA) female ports for both hydrocarbon and water dew-point channels; Sampling system: 6mm OD or 1/4″ OD
    Operating Environment Indoors/Outdoors -20 to +50°C (-4 to +122°F), Max 95% RH
    Power Supply 90 to 260 VAC 50/60 Hz, 125 W Main Unit
    300W c/w indoor sampling system
    400W c/w outdoor sampling system
    Weight ~60kg (132.3 lbs) c/w Sampling system
    Display Touch screen with vacuum fluorescent display
    Sample System Enclosure Carbon Steel or 316L Stainless Steel optional
    Outputs Modbus RTU, RS485 @ 9600 baud rate. Two 4-20 mA linear (non-isolated) outputs, user configurable for any combination of dew point or pressure parameters
    Alarms Process and analyzer status via software register and display annotation. Integrated low flow alarms for each sample flow. Analyzer status fault flag 23 mA on mA output 1
    Hazardous Area Certification ATEX: II 2 G Ex d IIB + H2 Gb
    IECEx: Ex d IIB + H2 Gb
    Tamb -40°C to +45°C T4
    Tamb -40°C to +60°C T3
    CSAus: Class I, Division 1, Goups B, C & D, T4
    *TC-TR: 1Ex d IIB+H2 T4, T3 Gb
    *Available to customer specific order (Please consult Envent)
    Pattern Approval GOST-R, GOST-K, GOST-T

Contact us to learn more about this product

Michell Instruments

Condumax II

The Condumax II Hydrocarbon Dew-Point Analyzer by Michell Instruments is designed to provide automatic, on-line measurement of hydrocarbon and water dew-point in Natural Gas.


The QMA601 is designed to provide reliable, fast and accurate measurement of trace moisture content in a wide variety of process applications where keeping moisture levels as low as possible is of critical importance.

Easidew Pro XP

The Easidew PRO XP moisture transmitter is an explosion-proof dew-point transmitter for trace moisture measurements in gases or liquids in hazardous areas.

MDM300 Series

A high-speed portable dew-point hygrometer for rapid spot-check measurements of dew point or moisture content in compressed air, natural gas, and other applications


Simple to use and rugged, the MDM50 high-speed portable hygrometer is the ideal tool for a wide range of on-site maintenance spot checks.


A robust, linear and stable oxygen analyzer for measurements in gases such as hydrogen, nitrogen, methane, biogas, or carbon dioxide.


Manual tester that uses chilled mirror technology and digital camera to provide highly accurate repeatable measurements of both hydrocarbon and water dew point in natural gas.