Process Moisture Analyzer

Fast, high-precision moisture measurements for hazardous areas.

The next generation 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.

Product Features

  • Fast and reliable measurement from 0.1 to 2000ppmV
  • Accuracy of ±0.1ppmv at <1ppmv and 10% of reading from 1 to 2000ppmv
  • Maintenance-free for 3 years
  • Built-in verification of customer process gas
  • IECEx, ATEX, TC-TR Ex certified for Exd flameproof, CSAus certified for explosion proof
  • Intuitive, color HMI with touch-screen keypad; no ‘hot work’ permit required
  • 14 internal alarms
  • 21 predefined carrier gases and 3 user-defined gases
  • Proven Michell Instruments quality: 40 years of expertise in moisture measurement built into the design

Technical Specification

Measuring technology Fast Response Quartz Crystal Microbalance
Calibrated range* 0.1 to 700ppmv
Measurement range 0.1 to 2000ppmv
Accuracy ±10% of reading from 1 to 2000ppmv
±0.1ppmv between 0.1 & 1ppmv
Repeatability ±5% of the reading from 1 to 2000ppmv
±0.1ppmv between 0.1 & 1ppmv
Limit of detection 0.1ppmv
Available units ppmv, ppmw, mg/Nm3, vapor pressure (Pa), dew point (°C/°F), lb/MMscf
Response speed T63 <2 mins to step change in either direction
T95 <5 mins to step change in either direction
Automatic calibration Internal moisture generator source calibrated traceable to NPL & NIST
Sensitivity 0.01ppmv or 1% of reading, whichever is greater
Electrical Specifications
Supply voltage 85 to 264 V AC, 47/63Hz or 24 V DC (ATEX / IECEx)
24 V DC only (CSAus)
Alarms 1 x system alarm, volt-free change-over (FORM C) 3 x process alarms, selectable for various parameters, volt-free changeover (FORM C)
Analog signals 2 x 4–20 mA or 1–5 V (selectable)
Maximum load resistance 500 Ω for 4–20 mA and minimum load of 1M Ω for 1–5 V
Digital Communications RS485 ModBus RTU
Modbus TCP
Data logging Available on analyzer (Limited number of values)or via Application Software
Local interface 7” color LCD with intuitive HMI
Electrical connections M20 entries for cable glands
Operating Conditions
Inlet pressure 3 barg
Outlet pressure 2 barg
Sample flow 300ml/min total flow
Sample gas temperature 0 to +100°C (+32 to +212°F)
Operating environment Analyzer only +5 to +45°C (+41 to +113°F) up to 90% RH
Analyzer in sampling system –20 to +55°C (–4 to +131°F) up to 95% RH (fitted with heater/thermostat and/or enclosure cooling as appropriate to maintain +5 to +45°C (+41 to +113°F) internal temperature)
Mechanical Specifications
Type GUB Flameproof Exd
Enclosure Lid & body: Cast copper-free aluminum LM25 (EN AC-42000), less than 0.6 magnesium
Glass window: Heat resistant, explosion proof, polyester coated, IP66, NEMA 4
Gas connections 1/8” NPT(F)
Weight 35kg without sampling system
Sample system enclosure 316L stainless steel
Hazardous area certification ATEX II 2 GD Ex d IIB+H2 T6 Gb, Ex tb IIIC T85°C Db, Tamb -40°C to +60°C
IECEx Ex d IIB+H2 T6 Gb, Ex tb IIIC T85°C Db, Tamb -40°C to +60°C
CSAc Class I, ZONES, Ex d IIB+H2 T6 Gb, Tamb -20°C to +55°C
CSAus Class I, Div 1, Group BCD T6, Tamb -25°C to +55°C
TC-TR 1Ex d IIB+H2 T4 Gb X, 1Ex tb IIIC 130°C Db X and 1Ex d IIB+H2 T3 Gb X, 1Ex tb IIIC 195°C Db X

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