Michell Instruments QMA601

Moisture Analyzer

Envent is working in partnership with Michell Instruments to provide a more comprehensive product offering of online process instrument designed specifically for measuring moisture in Natural Gas. The advanced Quartz Crystal Microbalance analyzer from Michell Instruments 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.

QMA601 Datasheet

  • Features
    • Fast and reliable moisture measurement from 0.1 to 2000 ppm
    • Accuracy of +/-0.1 ppm at <1ppm and 10% of reading from 1 to 2000 ppm
    • Built-in verification of customer process gas
    • Intuitive, 7″ colour LCD display with touch pad operation No “hot work” permit required.
    • 14 internal alarms
    • 21 predefined carrier gas and 3 user defined gases
    • Incorporates an automatic or manual verification system that can use the internal traceable moisture generator
    • Low maintenance
    • 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
  • Applications
    • Natural gas glycol dehydration
    • Natural gas transmission monitoring
    • Natural gas Storage
    • Molecular sieve dehydration of natural gas
    • LNG receiving/re-gasification plants
    • Ethylene and propylene production
    • Refinery catalytic reforming recycle gas monitoring
  • Specifications
    Measurement Technology Fast Response Quartz Crystal Microbalance
    Calibrated Range 0.1 ppmv to 700 ppmv
    Measurement Range 0.1 ppmv to 2000 ppmv
    Accuracy ±10% of reading from 1 to 2000 ppmv
    ±0.1 ppmv between 0.1 & 1 ppmv
    Repeatability ±5% of the reading from 1 to 2000 ppmv
    ±0.1 ppmv between 0.1 & 1 ppmv
    Limit of Detection 0.1 ppmv
    Available Units ppmv, lb/MMSCF, mg/Nm3, dew point °C or °F
    Response Speed T63 <2 mins to step change in either direction
    T85 <5 mins to step change in either direction
    Self Verification Internal moisture generator source calibrated traceable to NPL & NIST
    Sensitivity 0.1ppmv or 1% of reading, whichever is greater
    Supply Voltage 24 VDC or 85 to 264 VAC 47/63Hz
    Alarms 1x System Alarm, volt free change-over (FORM C)
    3x Process Alarms, selectable for various parameters, volstfree change-over (FORM C)
    Communications RS485 ModBus RTU
    2 x 4-20 mA or 1-5V (selectable)
    Maximum load resistance 500 ohms for 4-20 mA and minimum load of 1M ohms for 1-5 V
    Data Logging Logs at 1 to 10 min intervals for a 24hr period
    Electrical Connections 3/4″ NPT
    Inlet Pressure 43.5 psig (3 barg)
    Outlet Pressure 29 psig (2 barg)
    Sample Flow 300 ml/min total flow
    Sample Gas Temperature 1 to 100°C (32 to 113°F)
    Analyzer Temperature 5 to 45°C (41 to 113°F) up to 90% RH
    Weight 77 lbs (35kg) without sample conditioning system
    Gas Connection 1/4″ Swagelok Tube
    Weight 77 lbs (35kg) without sample conditioning system
    Sample System Enclosure Carbon Steel or 316L Stainless Steel optional
    Hazardous Area Certification ATEX: II 2 GD Ex d IIB+H2 T4 Gb Ex tb IIIC 130oC Db (-40 to 45°C)
    II 2 GD Ex d IIB+H2 T3 Gb Ex tb IIIC 130oC Db (-40 to 45°C)
    IECEx: Ex d IIB+H2 T4 Gb Ex tb IIIC 130oC Db (-40 to 45°C)
    Ex d IIB+H2 T3 Gb Ex tb IIIC 190°C Db (-40 to 55°C)
    CSAus: Class I, Division 1, Groups B, C & D, T6 (-25°C to 55°C)
    TC-TR: 1Ex d IIB+H2 T4 Gb X, 1Ex tb IIIC 130°C Db X
    1Ex d IIB+H2 T3 Gb X, 1Ex tb IIIC 195°C Db X

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