Thermocouple cold-end ice-point compensation device

Abstract

The invention provides a thermocouple cold-end ice-point compensation device, which comprises a first container. The first container is filled with ice-water mixture. The first container has an opening. The opening is provided with a support portion. Two second capacitors and a thermometer are inserted in the support portion. The measuring end of the thermometer and the portions, extending into the first container, of the second capacitors are immersed into the ice-water mixture. Each second capacitor is filled with insulating liquid for insulation and heat radiation. Each second capacitor is provided with an opening; and the opening is provided with a second capacitor plug. The two second capacitors are respectively provided with wires. A part of wire body of each wire is immersed into the insulating liquid; and the two ends of the wires pass through the corresponding second capacitor plug and extend out of the second capacitor plug. Compared with the prior art, the device can enable the wires to be isolated from the ice-water mixture, thereby preventing the problem of short circuit due to non-pureness of the ice-water mixture under the environment of 0 DEG C, and improving calibration accuracy when the wires are in the environment of 0 DEG C.

Description

technical field [0001] The invention relates to a measurement technology, in particular to a freezing point compensation device for a thermocouple cold junction. Background technique [0002] Thermocouple thermometer is a widely used temperature measuring device in industrial production. It is simple in structure, easy to use, high in accuracy, wide in range, anti-vibration, and suitable for medium and high temperature temperature range measurement. The principle of temperature measurement is: two conductors with different components (called thermocouple wire or thermode) are connected to form a circuit at both ends. When the temperature of the junction is different, an electromotive force will be generated in the circuit. This phenomenon is called Thermoelectric effect, and this electromotive force is called thermoelectric potential. Thermocouples use this principle to measure temperature. Among them, one end directly used to measure the temperature of the medium is called...

AI Technical Summary

Problems solved by technology

[0007] During the calibration process, the connecting ends of the compensation wire and the copper wire need to be placed in a freezing point device at 0°C. In "JJG 617-1996 Verification of Digital Temperature Indicating Regulators", the method of making the ice tank is not specified in detail, but in this regulation A calibration method is suggested in the wiring diagram ( figure 1 shown), if the figure 1 The wiring method will have the following defects: if the ice water in the ice tank is not pure, the conduction of the ice water will cause the two copper wires to short circuit, thus making the calibration inaccurate, and may damage the standard DC voltage source in serious cases

Images