Updated:2023-10-13
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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
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