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The use of hydrogen sensors can be categorized into three types
of application:
- Safety monitoring
- Leak detection
- Process control
When applied in one of these areas hydrogen sensors fulfill the
following tasks:
- Indicate a hazardous condition
- Provide warnings or alarms for out-of-limits conditions
- Monitor and control System Operation
- Provide performance data
The efficiency of gas sensor application for facilitating the safe use of hydrogen depends considerably on the sensor response to a change in hydrogen concentration. Therefore, the response time has been measured for five different-type commercially available hydrogen sensors. Experiments showed that all these sensors surpass the ISO 26142 standard; for the response times t90 values of 2 s to 16 s were estimated. Results can be fitted with an exponential or sigmoidal function. It can be demonstrated that the results on transient behaviour depend on both the operating parameters of sensors and Investigation methods, as well as on the experimental conditions: gas change rate and concentration jump.