Product category:
Humidity and moisture sensing systems
News Release from: Michell Instruments | Subject: Cermax IS
Edited by the Processingtalk Editorial
Team on 25 September 2006
Measurement of dew point in hydrogen
In the power industry hydrogen is frequently used as a direct coolant for the generator stator windings: the Cermax IS is introduced as an advanced portable hygrometer for monitoring hydrogen humidity
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
This article was originally published on Processingtalk on 3 Nov 2005 at 8.00am (UK)
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It is vital that this process can be measured and the Michell Instruments portable Cermax IS, with its hazardous area capabilities, is the ideal solution.
The re-circulating hydrogen removes heat from the generator, transferring it via a heat exchanger into a secondary cooling circuit which uses de-mineralised water.
Often this de-mineralised water is then cooled either by sea water or river water, dependent upon the location of the power station.
Further reading
Dew point transmitter is IS for CNG applications
The new Easidew TX transmitter is a small and reliable intrinsically safe dew point transmitter, recently developed by Michell for CNG applications
DryCheck dew point instrument is easy to install
The DryCheck self-contained dew point instrument is an accurate, stable and economic instrument with a simple sampling system, that is above all else easy to install
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 dew point of the hydrogen is monitored and maintained at a safe level, as a build up of moisture in hydrogen can lead to a risk of flashover.
The Michell intrinsically safe portable dew point 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 usually rate a fast speed of response as a pre-requisite 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 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 dew point (dp) and indication down to -120C and up to +30C dp.
The advanced portable hygrometer offers a measurement accuracy of +/- 1C dp in the range of +20C to -59.9C dp and +/-2C dp in the range -100 to -60C dp. Request a free brochure from Michell Instruments ...
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