The gas and the characteristics of temperature sensor

Gas sensor is to point to be measured can be converted to the category, concentration, and composition of a certain relation with the electrical device or devices, used to provide related to the existence of the measuring gas and concentration of the size of the information. Gas sensor is the core of the gas detection system, usually installed in detecting head, through the detection head gas sensor to regulate gas samples, usually including interference filter out impurities and gas suction, dry or refrigeration processing, samples, and even to chemical processing of samples, so that the chemical sensors for a more rapid measurement.

gas sensor is mainly used for industrial gas, gas, petrochemical and other departments of flammable, explosive, toxic and harmful gas automatic monitoring, forecast and control. Some gas sensor has the following main features:

1) sensitivity. Sensitivity refers to the sensor output variation and the ratio of the measured input change place, mainly depends on the sensor structure used by the technology. Most of the design principle of gas sensors using biological chemical, electrochemical, and optical physics. The first thing to consider is to choose a kind of sensitive technology, its rich value of the target gas limit or the lowest percentage of explosion limit of detection to have enough sensitivity.

(2) the stability. Stability refers to the stability of the sensor response in the whole work time, depending on the zero point of moving and interval drift. Zero drift, in which there is no target gas sensor output response of the whole work time change. Interval drift is at target in sensor output in response to changes in the gas, show the sensor output signal in the work time reduced. Ideally, a sensor under the condition of continuous work, zero drift is less than 10% a year.

(3) corrosion resistance. Corrosion resistance is refers to the sensor exposed to high volume fraction in the gas target. When a large number of leakage in gas, the probe should be able to expect under gas volume fraction 1 o ~ 20 times. Under the condition of returned to normal work, sensor drift and zero point correction should be as small as possible.

(4) selectivity. Selectivity is also known as cross sensitivity, can by measuring the interference by a certain concentration of gas generated by the sensor response to determine. This response is equivalent to a certain concentration of target gas generated by the sensor response. This feature in a variety of tracking the application of the gas is very important, the ideal sensor should have high sensitivity and high selectivity.

the types of gas sensors are: thermal conductivity type gas sensors, Hot wire sensor and thermal resistor gas sensor) , contact combustion type gas sensors, semiconductor gas sensors, infrared gas sensors, optical fiber gas sensor, etc.

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key words: thermal resistance, thermocouple, thermal resistance, platinum resistance, PT100, PT1000, pressure sensor and digital temperature sensor