MI Michell Instruments Ltd.

QMA601 Low-Range Process Moisture Analyzer

Name: QMA601 Low-Range Process Moisture Analyzer
Brand: Michell Instruments Ltd.
SKU: MI-QMA601

Fast, high-precision quartz crystal microbalance trace moisture analyzer for hazardous areas.

ModelQMA601

SKUMI-QMA601

CategoryDew Point & Moisture

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Key Features

Low-range measurement 0.02–100 ppmV (trending to 2000 ppmV)
Accuracy ±0.03 ppmV or ±10 % of reading, whichever is greater
Built-in verification via internal moisture generator
Maintenance free for 3 years
Suitable for natural gas with up to 20 % hydrogen
IECEx, ATEX, UKCA, TR CU Ex (Ex d); cQPSus explosion proof
7" color touch-screen HMI — no hot-work permit required
2 × 4–20 mA or 1–5 V outputs, Modbus RTU (RS485) and Modbus TCP
21 predefined and 3 user-defined carrier gases; 14 internal alarms

Overview

The QMA601 is a next-generation advanced quartz crystal microbalance analyzer designed for reliable, fast and accurate measurement of trace moisture in process applications where moisture must be kept as low as possible. It measures from 0.02 to 100 ppmV with built-in verification against an internal moisture generator, and is suitable for natural gas containing up to 20 % hydrogen with no further modification.

Working Principle

A quartz crystal sensitised with a hygroscopic film changes oscillation frequency as water molecules are adsorbed. The analyzer switches between sample and reference gas and measures the frequency change; automatic calibration uses an internal moisture generator (nominally 0.5 ppmV) traceable to NPL and NIST.

Applications

Benefits

Fast response to sample moisture changes
Low maintenance (3 years maintenance free)
Easy integration into SCADA via Modbus RTU/TCP

Technical Specifications

Measurement
Technology	Fast-response quartz crystal microbalance
Range	0.02–100 ppmV, trending to 2000 ppmV
Accuracy	±0.03 ppmV or ±10 % of reading, whichever is greater
Repeatability	±5 % of reading (0.3–100 ppmV)
Limit of Detection	0.02 ppmV
Sensitivity	0.01 ppmV or 1 % of reading

Operating Conditions
Inlet Pressure	2 barg
Outlet Pressure	1 barg
Sample Flow	300 ml/min total
Sample Gas Temperature	0…+100 °C

Electrical
Supply	85–264 V AC 47/63 Hz or 24 V DC (24 V DC only for cQPSus)
Analog	2 × 4–20 mA or 1–5 V (selectable)
Digital	Modbus RTU (RS485), Modbus TCP
Alarms	1 system + 3 process alarms, volt-free changeover

Mechanical
Enclosure	GUB flameproof Ex d, cast copper-free aluminum, IP66 / NEMA 4
Weight	35 kg without sampling system
Hazardous Area	ATEX/UKCA/IECEx Ex db IIB+H2 T6 Gb; cQPSus Class I Div 1 Groups B, C, D T6

Downloads

Datasheet (PDF)PDF

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Frequently Asked Questions

What warranty is offered on this product?

All Tetracon-supplied instruments carry the original manufacturer warranty (typically 12–24 months) plus first-line local support from our Islamabad service centre.

Do you provide installation and commissioning?

Yes. Our manufacturer-trained engineers offer on-site installation, commissioning and startup training anywhere in Pakistan.

Are spares and calibration available locally?

Common spares are held in local stock. Calibration is available at our lab or on-site with NIST-traceable reference standards.

How long is the typical lead time?

Stocked items ship within 3–5 working days; engineered configurations typically 6–10 weeks depending on manufacturer schedule.

Request a Quote — QMA601 Low-Range Process Moisture Analyzer

Complete the form below and one of our engineers will respond within 1 working day with pricing and lead time. Prefer email? Contact our sales team.