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Industry News We often see an indicator in the parameter table of the sensor - response time T90. This is a very important parameter, but what does it mean?
Response time, in more technical terms, refers to the time it takes for the sensor's output to reach a specified percentage (usually 70% or 90%) of its stable value following a step change in gas concentration. Whether T90 or T70, they conceptually represent the same thing, reflecting the sensor's response speed to toxic and hazardous gases.
T90 refers to the time it takes for the sensor's reading to rise from 0 to 90% of the measured gas concentration in the environment. For example, a T90 of <15s in the figure above means that the sensor can detect 90% of the actual carbon dioxide concentration in the environment within 15 seconds.
As can be seen from the above figure, when a sensor detects gas, its reading changes in a curved curve, not a linear one. Therefore, the performance of a sensor isn't judged by whether its reading changes immediately upon exposure to the gas being measured, but rather by its response time.
Sensors with slow response times will still show reading changes when first exposed to the gas, but this change will be prolonged, and the reading won't truly reflect the gas concentration, affecting the true concentration.
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