Characteristics Of Gas Sensors

- Jun 13, 2018 -

Gas sensors are a major category of chemical sensors. From working principle, characteristic analysis to measurement technology, from the materials used to the manufacturing process, from the detection object to the application field, can constitute an independent classification criteria, derived a complex and complex classification system, especially in the classification standards of the problem is not unified, it is difficult to carry out strict system classification.

Now let's take a look at the main features of gas sensors:

1, stability Stability refers to the stability of the basic response of the sensor over the whole working time, depending on the 0 drift and interval drift. 0 Point Drift is the change of the sensor output response during the whole working time without the target gas. Interval drift refers to the change of the output response of the sensor in the target gas continuously, which is the decrease of the output signal of the sensor during working time.

Ideally, a sensor in continuous operating conditions, 0 points per year drift less than 10%.

2. Sensitivity Sensitivity refers to the ratio of the transducer's output change to the measured input, and relies mainly on the technology used in the sensor structure. Most gas sensors are designed using biochemical, electrochemical, physical, and optical principles.

The first consideration is to select a sensitive technique that is sensitive enough to detect the percentage of the valve limit (tlv-thresh-oldlimitvalue) or minimum explosion limit (lel-lowerexplosivelimit) of the target gas.

3. Selectivity Selectivity is also known as cross sensitivity. Can be determined by measuring the response of a sensor generated by a certain concentration of interference gas. This response is equivalent to a certain concentration of the target gas generated by the sensor response. This feature is important in tracking the use of multiple gases, because cross sensitivity reduces repeatability and reliability of measurement, and ideal sensors should be highly sensitive and highly selective.

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