A pressure-controlled twisted-pair platinum resistance thermometer

Abstract

The invention relates to a pressure-controlled twisted-pair platinum resistance thermometer comprising the following parts including a temperature measuring rod of which the lower end is in a closed state and the upper end is in an open state; a handle portion matched with the upper opening of the temperature measuring rod, a support frame and a platinum resistance wire, wherein the first end of the platinum resistance wire is connected to a first connection point, and is connected to a first lead and a second lead at the first connection point; the second end of the platinum resistance wire is connected to a second connection point, and is connected to a third lead and a fourth lead at the second connection point; the first and third leads are wound around each other and spirally extend to the upper opening of the temperature measuring rod, and the second and fourth leads are wound around each other and spirally extend to the upper opening of the temperature measuring rod; and a venthole is formed in the handle portion. The pressure-controlled twisted-pair platinum resistance thermometer provided by the invention eliminates the self-heating problem of the resistance wire throughthe electromagnetic cancellation between the leads and the pressure-controlled gas, thereby achieving high-precision measurement of the platinum resistance thermometer.

Description

technical field [0001] The invention relates to a platinum resistance thermometer, in particular to a twisted-pair platinum resistance thermometer. Background technique [0002] The standard platinum resistance thermometer is an interpolation instrument that transmits the international temperature scale in the range of 13.8033K-960.78°C. It is used as a standard when verifying various standard thermometers and precision temperature measuring instruments. It can also be directly used for high-precision measurement in this temperature range. Platinum resistance thermometers are widely used due to their measurement accuracy. [0003] Because the two ends of the platinum resistance wire of the platinum resistance thermometer usually need to be led out through the lead wires, and the signal of the lead wires often causes interference, which has a certain impact on the stability and accuracy of the platinum resistance thermometer. The resistance value of the platinum resistance w...

AI Technical Summary

Problems solved by technology

[0003] Because the two ends of the platinum resistance wire of the platinum resistance thermometer usually need to be led out through the lead wires, and the signal of the lead wires often causes interference, which has a certain impact on the stability and accuracy of the platinum resistance thermometer. The resistance value of the platinum resistance wire is measured. As the resistance wire itself inevitably has self-heating phenomenon, the resistance wire generates heat due to the electrical signal, and then a part of the temperature caused by the self-heating of the resistance wire will be introduced into the thermometer measurement. In addition, the above factors lead to a certain impact on the uncertainty of the platinum resistance thermometer. During the packaging process of the thermometer, there may be problems such as insufficient air pressure inside the thermometer, low heat exchange efficiency, and affecting the response speed of the thermometer.

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