Platinum resistance temperature sensor with high intensity and fast response

Abstract

The invention relates to a platinum resistance temperature sensor with high intensity and fast response. A temperature-sensing element is installed at a small diameter part of a reducing temperature-sensing drivepipe, and insulating materials are filled up between the back end of the temperature-sensing element and the temperature-sensing drivepipe. An inner protective tube is provided with a sheathed signal cable leading wire, and the sheath signal cable leading wire is connected with the temperature-sensing element. The temperature-sensing drivepipe and the inner protective tube are welded together and form a thermometer core, and a sealed tube is welded with the thermometer. A bottom hole is formed in the bottom of a small diameter part of a conical outer protective tube, three groups of diversion holes dividing the circumference equally are formed in the small diameter part of the conical outer protective tube in a radical direction, each group of diversion holes are provided with a plurality of diversion holes along an axial direction, and the rear end of the outer protective tube is in threaded connection with a base of a media fluid channel. The inner cavity of the inner protective tube fits with the inner cavity of the outer protective tube, the inner protective tube and the outer protective tube are connected and sealed with a Swagelok, and the Swagelok body is welded with the outer protective tube. The platinum resistance temperature sensor fits in with the special requirements of high temperature, high pressure and high speed media fluid, and possesses fast thermal response.

Description

technical field [0001] The invention relates to a temperature measuring instrument, in particular to a high-strength, fast-response platinum resistance temperature sensor. Background technique [0002] The platinum resistance temperature sensor is a temperature sensor made by using its resistance and temperature as a certain function. The thermal response time of the platinum resistance thermometer refers to the resistance value of a thermometer changing to a certain value equivalent to the step change when the temperature changes step by step. time required for a specified percentage. Usually use τ 0.9 , τ 0.632 and τ 0.5 etc., which refer to the lag time when the temperature changes by 90%, 63.2% and 50%, respectively. Response time is an important indicator of thermometer sensitivity. The temperature sensor packaged with the ceramic platinum resistance sensitive element will have a great difference in the response time of the sensor due to its different structure. ...

AI Technical Summary

Problems solved by technology

[0004] The cross-sectional area of ​​the cylindrical resistance thermometer can be regarded as the proportional coefficient of the response time. The traditional thermometer cannot meet the technical requirements of fast thermal response time, maintaining the strength of the thermometer, and withstanding high temperature, high pressure and high-speed fluid erosion of the medium.

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