Michell Instruments MDM300 I.S. portable hygrometer

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Michell Instruments designed the MDM300 I.S. portable hygrometer for fast, easy and ergonomic operation in hazardous areas - making it suitable for checking the dewpoint in hydrogen-cooled electricity generators.

Depending on plant requirements, water dewpoint in hydrogen coolant can be continually monitored with online instrumentation or spot checks taken using a portable measurement device. An online solution has the advantage of continuous monitoring and alarm capability should the dewpoint rise above an ambient level but a portable ‘spot check’ instrument offers a cost-effective and flexible solution which can be used across the site for periodic checking or as backup to an online system.

The MDM300 I.S. maximises operational efficiency by taking as many measurements as required from different applications across a whole site with no waiting time in between. It gives fast, accurate responses and measurements are carried out at system pressure to give true representation of the risk of condensation occurring in working conditions. To ensure easy quality control and compliance with the requirements of local authorities, the units are supplied with traceable calibration certificates.

The MDM300 I.S. is an adaptable unit with a robust casing which can withstand the rigours of day-to-day operation at a power utility plant. Customised sampling and other accessories are available to ensure spot checks are as quick and easy as possible and the unit is also suitable for other applications on site, such as the measurement of moisture in SF₆, natural gas and instrument air.