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Process Moisture Analyzer - Michell QMA601

Updated:2025-03-13

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  • 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...700ppmv
Applies only to standard 30-30 second cycle variant. Contact us for further details.
Measurement range 0.1...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...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

Suitable Applications

Molecular sieve dehydration of natural gas

Natural Gas transmission and storage

Refinery catalytic reforming — recycle gas monitoring

Ethylene and propylene production

LNG production / revaporization

Glycol dehydration of natural gas

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Customer Service QQ

Customer Hotline:

010-52867770
0l0-52867771
l3811111452
l7896OO5796

Technical Supports

0l0-52867774
l7896OO5796
info@dorgean.com
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