A high precision pt200 high temperature sensor

Abstract

The invention discloses a high-precision PT200 high-temperature sensor, which includes a thermistor and a detection rod. A resistance cavity with a heat dissipation function is opened inside the detection rod, and an exhaust gas passage is opened through the outer wall of the detection rod. A transition port is opened between the tail gas passage and the resistance chamber. In the present invention, a tail gas channel is provided on the detection rod, and a transition port is set between the tail gas channel and the resistance cavity, and the heat resistance plate with a vacuum inside is rotated in the tail gas channel. When the disk swings, the groove acts as a "valve" between the resistance cavity and the exhaust gas channel, that is to say, the resistance cavity and the exhaust gas channel are connected and blocked. The resistor can contact the latest exhaust gas in real time; and a heat dissipation pipe is installed outside the detection rod, and the heat dissipation pipe can discharge the heat in the resistance cavity in time, so the residual temperature in the resistance cavity will not affect the accuracy of the thermal resistance real-time monitoring.

Description

technical field [0001] The invention relates to the technical field of tail gas temperature detection, in particular to a high-precision PT200 high-temperature sensor. Background technique [0002] The principle of the temperature sensor is that the thermal sensor collects the external temperature, converts it into a digital signal through the signal conversion circuit, and then outputs the digital signal to complete the real-time monitoring of the temperature. At present, the structural components of the PT200 high temperature sensor mainly include the detection rod and the thermal sensor. , heat-conducting element and conversion circuit; a heat-sensitive element is installed in the detection rod, and the heat-sensitive element is mainly a thermal resistor, and the detection end of the detection rod is provided with a heat-conducting element, and the external temperature is conducted to the position of the thermal resistance through the heat-conducting element, and the therm...

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Problems solved by technology

[0002] The principle of the temperature sensor is that the thermal element collects the external temperature, converts it into a digital signal through the signal conversion circuit, and then outputs the digital signal to complete the real-time monitoring of the temperature. At present, the structural components of the PT200 high temperature sensor mainly include the detection rod and the thermal element. , heat-conducting element and conversion circuit; a heat-sensitive element is installed in the detection rod, and the heat-sensitive element is mainly a thermal resistor, and the detection end of the detection rod is provided with a heat-conducting element, and the external temperature is conducted to the position of the thermal resistance through the heat-conducting element, and the thermal resistance is changed by its characteristics. Convert circuit voltage or current; PT200 high temperature sensor is commonly used at the position of high temperature exhaust gas discharge port, high temperature exhaust gas temperature is high, extracting accurate temperature value is helpful for production and emission control, but the current PT200 high temperature sensor is used when extracting temperature Indirect measurement of heat transfer elements, resulting in hysteresis and low accuracy of temperature measurement, which will affect the control of production and emissions

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