High-temperature heating furnace temperature sensor distribution device and metering calibration method thereof

Abstract

The invention provides a high-temperature heating furnace temperature sensor distribution device and a metering calibration method thereof. The temperature sensor distribution device is arranged, thedistribution requirements of the number of sensors and temperature measurement positions are met through the distribution device, a post-positioned temperature measurement mode is used, and an electric lead of a temperature sensor penetrates out of a rear temperature measuring hole of a high-temperature heating furnace to be detected, so that damage to the electric lead of the temperature sensor when a furnace door is closed in a front temperature measuring mode is avoided, and before the high-temperature heating furnace is calibrated, a temperature control thermocouple and a temperature controller of the high-temperature heating furnace are calibrated to improve the accuracy of a calibration result.

Description

Technical field: [0001] The invention belongs to the technical field of verification and calibration of a high-temperature heating furnace with an operating temperature of (300-1300) °C, and in particular relates to a high-temperature heating furnace temperature sensor arrangement device and a measurement and calibration method thereof. Background technique: [0002] The high-temperature heating furnace is a special high-temperature equipment specially developed for the laboratories of universities, scientific research institutes, and industrial and mining enterprises. , Metals, non-metals and other chemical and material materials are sintered, melted and analyzed to provide technical support for accurate and reliable laboratory results and product process quality for enterprises and institutions. [0003] At present, high-temperature heating furnaces usually use electric heating, so they are also called resistance furnaces. In a certain period of time, electric current pass...

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Problems solved by technology

[0005] (1) There is no device for fixing the detection thermocouple in the box-type resistance furnace. It is difficult to fix the position of the detection thermocouple after it is placed in the box-type resistance furnace. When the furnace door is closed, the furnace door will squeeze the hot electrode of the detection thermocouple, which will cause The position of the measuring end of the thermocouple detected in the furnace changes, which affects the accuracy of the measurement results

[0006] (2) The detection thermocouple is put into the furnace from the furnace mouth, and the reference end of the detection thermocouple is led out of the furnace from the furnace mouth. This leads to the fact that during the detection process, the furnace door of the box-type resistance furnace is not closed tightly, which affects the measurement results. accuracy

However, in the existing JJF 1376-2012 box-type resistance furnace calibration specification, the default thermocouple and furnace temperature controller of the box-type resistance furnace are qualified products, and there is no corresponding control thermocouple and furnace. Calibration of the temperature controller

The built-in temperature control thermocouple is used as a vulnerable part for temperature measurement. In principle, it should be replaced once a year. However, in order to save costs, the user has not replaced it for many years, resulting in a large error in the thermocouple itself, or even unqualified, which will directly affect the calibration. The accuracy of the results; the furnace temperature controller is the main temperature control instrument used in conjunction with the box-type resistance furnace, and whether it is qualified or not directly affects the accuracy of the calibration results. Before the calibration of the high-temperature heating furnace, the error correction of the temperature control instrument is first performed, which leads to the introduction of new errors, resulting in poor accuracy of the calibration results of the temperature deviation (upper and lower deviations)

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