City Technology launches toxic gas sensors
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City Technology product story
Edited by the Engineeringtalk editorial team
Aug 10, 2009
City Technology has released the next generation of two of its gas sensors, the 4CF+ carbon monoxide sensor and the 4HS+ hydrogen sulphide sensor.
The existing 4CF and 4HS sensors are used by manufacturers of single and multi-gas detection instruments for life safety applications.
The latest designs build on customer feedback gained from deployed devices in the field to offer significantly reduced calibration times, improved reliability, reduced sensitivity variation between devices and complete backwards mechanical compatibility with previous generations.
A number of design improvements and highly automated volume manufacturing and test techniques have contributed to the sensors' enhanced performance.
All pins are gold plated, lowering contact resistance with the socket and improving reliability in use, particularly in situations where the instrument is likely to be subjected to shock or vibration.
The ultrasonic welding of the internal current collector wires has been improved to give a higher quality, more uniform weld, improving reliability and reducing early failures.
At various stages during the manufacturing process, 24 different parameters are tested, each stage of the assembly process is optically monitored and automated part placement reduces variations between devices, ensuring error-free assembly.
A 100 per cent leak test on the electrode sealing is an integral part of the manufacturing process, resulting in an increase in field reliability by eliminating one of the more common failure modes found in other sensors.
More than 10 million units have been shipped to date; the overall return rate from the field is 0.006 per cent, mainly because of the pre-emptive testing carried out at every stage of manufacturing.
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