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Process Moisture Analyzer - Michell QMA601

Updated:2025-03-13

Brand: PST/Michell
Model: QMA601
Description: The QMA601 Process Moisture Analyzer provides highly reliable, fast and accurate measurement of moisture content in a wide variety of carrier gases. It has a lower detection limit of 0.1 ppmV with rel
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Product Details

Process Moisture Analyzer - Michell QMA601 Description：

Product Manual Datasheet

Self-Calibrating Fast Moisture Measurement

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, UKCA, TR CU Ex certified for Exd flameproof, cQPSus 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

The QMA601 Process Moisture Analyzer provides highly reliable, fast and accurate measurement of moisture content in a wide variety of carrier gases. It has a lower detection limit of 0.1 ppmV with reliable accuracy at sub-ppm trace moisture levels. Using Michell’s latest developments in Quartz Crystal Microbalance technology the analyzer measures moisture levels effectively even in gases with changing background compositions. It is fully certified for use in hazardous areas.

The QMA601 requires only minimal routine maintenance to ensure low cost of ownership. It features an intuitive ‘through the glass’ touch screen interface which is both easy to use and also means that the analyzer can be interrogated and configured without the need for a hot works permit.

QMA601 is suitable for use with natural gas containing up to 20 % hydrogen with no further modification required.

Specification

Measuring technology	Fast Response Quartz Crystal Microbalance
Calibrated range	0.1...700ppm_v Applies only to standard 30-30 second cycle variant. Contact us for further details.
Measurement range	0.1...2000ppm_v
Accuracy	±10% of reading from 1 to 2000ppm_v ±0.1ppm_v between 0.1 & 1ppm_v
Repeatability	±5% of the reading from 1 to 2000ppm_v ±0.1ppm_v between 0.1 & 1ppm_v
Limit of detection	0.1ppm_v
Available units	ppm_v, ppm_w, 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	0.01ppm_v or 1% of reading, whichever is greater
Electrical Specifications
Supply voltage	85...264 V AC, 47/63Hz or 24 V DC (ATEX/UKCA/IECEx) 24 V DC only (cQPSus)
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	2 barg
Outlet pressure	1 barg
Sample flow	300 ml/min total flow
Sample gas temperature	0...+100 °C (+32...+212 °F)
Operating environment	Analyzer only +5...+45 °C (+41...+113 °F) up to 90% RH Analyzer in sampling system –20...+55 °C (–4...+131 °F) up to 95 %rh (fitted with heater/thermostat and/or enclosure cooling as appropriate to maintain +5...+45 °C (+41...+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	35 kg without sampling system
Sample system enclosure	316L stainless steel
Certifications
Hazardous area certification	ATEX/UKCA II 2 GD Ex db IIB+H2 T6 Gb, Tamb -40 °C...+60 °C IECEx Ex db IIB+H2 T6 Gb, Tamb -40 °C...+60 °C cQPSus CLS I, Div 1, Group BCD T6, Tamb -25 °C...+55 °C, CLS I, ZONE 1, AEx db IIB + H2 T6 Gb, Ex db IIB + H2 T6 Gb, Tamb -20oC...+55oC TR CU 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