Dewpoint sensors aid fuel cell development
A
Michell Instruments product story
Edited by the Engineeringtalk editorial team
May 9, 2005
A successful evaluation trial has led a major fuel cell development company to purchase four high-performance Optidew Vision optical dewpoint meters.
A successful evaluation trial has led a major fuel cell development company to purchase four high-performance Optidew Vision optical dewpoint meters from Cambridge-based Michell Instruments.
The instruments are used in a research programme aimed at extending the life of fuel cells used in motor vehicles and for stationary power.
The development company is researching into ways to increase the performance and operational life of fuel cells used for vehicular and stationary power applications - therefore increasing the commercial viability of the cells.
Michell's Optidew vision hygrometers are used in a process to profile the performance of the humidification system of different fuel cell test stands, which are used to test membrane electrode assemblies (MEAs) under different operating conditions.
The instruments measure precisely the humidity and temperature that the MEAs are exposed to while being profiled.
The long-term life of a fuel cell is mostly limited by the MEA.
The research tests new construction methods and materials for MEAs, evaluating prototypes across a broad range of humidity and temperature conditions.
Once perfected, the best combinations are then developed into larger MEAs for production.
Previously a relative humidity probe has been used to measure dew point but this device was prone to saturation during trials, when humidity reached 30 to 80%.
This resulted in prolonged delays in the trials while the probe was left to dry out.
The device was also only accurate to +/-3% relative humidity (RH).
The Optidew Vision uses Michell's cooled mirror dew-point technology, which improves measurement accuracy during trials of +/-0.2% RH.
The instrument is also unaffected by saturation and therefore does not delay the trial schedule.
Each instrument is a high temperature measurement sensor capable of measuring between 50 and 90C.
Two Optidew Visions are used to calibrate a stand's humidification system, one for the anode side and one for the cathode side.
The four portable instruments enable the company to check two stands simultaneously.
"After carrying out a trial of the Optidew Vision we quickly realised the significant improvements that could be achieved over our previous methods of measuring temperature and humidity", said a spokesperson from the fuel cell development company.
"These instruments give us complete confidence in the accuracy of measurement that is taken, which reflects in the validity of the experiments we are doing".
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Dew point meter provides stability
Precision dew point meter in bench-top format, combined with sensor probe design and cable length up to 30m, is suitable for laboratory humidity or moisture measurement. -
Dewpoint meters help in fuel cell research
A successful evaluation trial has led a major fuel cell development company to purchase four high-performance Optidew Vision optical dewpoint meters from Cambridge-based Michell Instruments. -
Dewpoint meter is precise about humidity
Optidew Vision is a precision dewpoint meter with an LCD panel. -
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Michell has introduced the XTP600 self-contained oxygen transmitter, which is claimed to make oxygen measurement in the process industry as simple as a field-pressure or temperature measurement.
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