Dewpoint hygrometer monitors hydrogen supplies
A
Michell Instruments product story
Edited by the Engineeringtalk editorial team
Sep 26, 2006
Intrinsically safe portable dewpoint hygrometer is ideal as a spot check tool on hydrogen-based cooling systems.
Within the power industry it is common practice to use hydrogen as a direct coolant for the generator stator windings.
Hydrogen is used because it has an extremely high heat transfer capacity and is much more efficient at transferring heat than any other medium.
It is vital that this process can measured, and Michell Instruments' portable Cermax IS, with its hazardous area capabilities, is the ideal solution.
The recirculating hydrogen removes heat from the generator, transferring it via a heat exchanger into a secondary cooling circuit which uses demineralised water.
Often this demineralised water is then cooled either by sea water or river water, dependent on location of the power station.
As it is not possible to hermetically seal the generator set castings, there is a potential for moisture to ingress from the surrounding air, similarly, as the heat exchanger gradually becomes more porous with age, it too will allow moisture to get into the hydrogen.
It is therefore essential that the dewpoint of the hydrogen is monitored and maintained at a safe margin, as a build up of moisture in hydrogen can lead to a risk of flashover.
Michell's intrinsically safe portable dewpoint hygrometer can be used for this type of application as a spot check tool.
With raw performance, rugged reliability, fast response and ease of use, Cermax IS (with data logging facility) enables the user to make a quick on-site measurement.
With ATEX, FM and CSA certification, the fully self-contained portable hygrometer will allow the user to check moisture content at any point in the process.
Users will usually rate a fast speed of response as a prerequisite for a portable hygrometer.
Cermax IS has been designed with this key feature in mind.
With an inherently fast ceramic moisture sensor and a minimum volume stainless steel sample housing, Cermax IS has a head start on the competition in this area.
If you couple this factor with Cermax IS's user selectable field operation mode, which allows even ppm level measurements to be made in a just a few minutes, the result is a world-class portable hygrometer with superior performance.
Cermax IS also offers extremely high accuracy and repeatability.
The combination of advanced sensor technology and measurement circuitry give Cermax IS a standard measurement from -100 to +20C dewpoint and indication down to 120C and up to +30C dewpoint.
The advanced portable hygrometer offers a measurement accuracy of +/- 1C dewpoint in the range +20 to -59.9C dewpoint and +/-2C dewpoint in the range -100 to -60C dewpoint.
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Contact Michell Instruments
Tel +44 1353 658000
Other Michell Instruments stories
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Easy moisture measurement in natural gas
Michell Instruments has a range of low-maintenance technologies to provide customers throughout the natural gas industry with the means to measure moisture content and hydrocarbon dew point. -
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Michell Instruments has supplied an energy company with hydrocarbon dew-point analysers in order to develop a control solution for the company's natural gas storage site in the UK. -
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Michell introduces intrinsically safe transmitter
Michell Instruments has added the Easidew Pro IS to its range of Easidew dew-point transmitters. -
Michell sensor speeds up maintenance of RH devices
Michell Instruments has introduced the I7000 Hygrosmart humidity sensor, which is claimed to make the maintenance of the company's relative-humidity (RH) instruments quick and simple with no downtime.
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