The characteristics of gas, thermocouple temperature sensor

Gas thermocouple 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 thermocouple sensor is the core of the gas detection system, usually installed in detecting head, through a gas detection head thermocouple sensor to regulate the 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 thermocouple sensor for a more rapid measurement.

gas thermocouple 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 thermocouple sensor has the following main features:

1) sensitivity. Sensitivity refers to the thermocouple sensor output variation and the ratio of the measured input change place, rely mainly on the technology used by thermocouple sensor structure. Most of the gas design principle of thermocouple sensor 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 thermocouple 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 thermocouple sensor output response of the whole work time change. Interval drift refers to the continuous thermocouple sensors placed in the target in the gas output response change, show the thermocouple sensor output signal decreased during the working time. Ideally, a thermocouple sensor under the condition of continuous work, zero drift is less than 10% a year.

(3) corrosion resistance. Corrosion resistance is refers to the thermocouple 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, thermocouple 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 thermocouple sensor response to determine. This response is equivalent to a certain concentration of the target gas generated by the thermocouple sensor response. This feature in a variety of tracking the application of the gas is very important, the ideal thermocouple sensor should have high sensitivity and high selectivity.

gas thermocouple sensor types are: thermal conductivity type gas thermocouple sensors ( Hot-wire thermocouple sensors and thermistors gas thermocouple sensor) , contact combustion type gas sensor thermocouple sensor, thermocouple sensors, infrared gas sensor thermocouple semiconductor gas sensor, optical fiber gas sensor thermocouple sensor, etc.

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