Michell Instruments QMA401 moisture analyser

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The Michell Instruments QMA401 moisture analyser features the latest generation of quartz crystal microbalance (QCM) sensor, designed to provide consistently accurate measurements of trace moisture. This consistency is achieved via a self-calibration system that adjusts the analyser against an internal moisture generator. Long-term stability of these measurement corrections is guaranteed, as the moisture generator is supplied with a calibration traceable to NPL and NIST.

Maintaining the system is simple, infrequent and inexpensive: no service at all is required for two years, at which point the desiccant dryer must be replaced — a process that can be carried out by the user in less than 10 min. The internal moisture generator can be replaced simply in the field with a freshly calibrated unit from the factory after three years of operation.

The QMA401 is claimed to be easy to use with an intuitive touchscreen interface for monitoring, logging and configuring parameters. Both real-time trend graphs and alarm indicators are immediately visible in colour on the main display. The instrument is supplied with both analog outputs, and USB and Ethernet digital connectivity, so that the device can be monitored and controlled remotely via a network.

Typical applications for the QMA401 are those which require trace moisture measurements in gases with high accuracy and fast response — such as verifying the purity of semiconductor plasma etching gases, monitoring polymer drying for plastic bottle manufacture and monitoring hydrogen cooling systems for power generators.