Multi-point temperature calibration device for accurately controlling temperature fluctuation of thermostatic water bath box and operation method thereof

Abstract

The invention discloses a multi-point temperature calibration device for accurately controlling temperature fluctuation of a thermostatic water bath box. The multi-point temperature calibration device comprises a thermostatic water bath box. An insulation can body and an insulation cover that is matched with the insulation can body are arranged inside the thermostatic water bath box; a temperature balance outer tube is arranged inside the insulation can body; a temperature balance inner tube is arranged inside the temperature balance outer tube; a platinum resistor and a T type thermocouple are arranged inside the temperature balance inner tube; and a support, which is arranged at a tube entrance of the temperature balance inner tube, is used for fixing the platinum resistor and the T type thermocouple in the temperature balance inner tube without the bottom and the sidewalls of the temperature balance inner tube contacted. Besides, the platinum resistor and the T type thermocouple are connected with a data acquisition instrument that is connected with a computer. According to the invention, beneficial effects are as follows: calibration can be carried out rapidly and conveniently; precision is high; and the apparatus and the method are suitable for a plurality of kinds of thermocouples including a K type thermocouple.

Description

technical field [0001] The invention relates to a calibration device, in particular to a multi-point temperature calibration device and method for precisely controlling the temperature fluctuation of a constant temperature water bath box. Background technique [0002] The T-type thermocouple is simple in structure, easy to use, and has the advantages of small time constant and no current self-heating problem, and is widely used in temperature measurement. [0003] The main function of the constant temperature water bath is to provide a constant temperature environment for scientific experiments such as calibration. In the experiment, sometimes it is necessary to use multiple T-type thermocouples, and the temperature measured by each T-type thermocouple is biased. In order to reduce this deviation, the T-type thermocouple needs to be calibrated. Within the temperature range required by the experiment (-20°C to 50°C), use a constant temperature water bath to calibrate the T-t...

AI Technical Summary

Problems solved by technology

The existing products have the following defects: first, the water bath fluctuates greatly due to the influence of the machine operation during the test, and the convective heat transfer produces a temperature difference, causing temperature fluctuations and unstable temperature calibration; second, several points of temperature are required during the experiment. The stable value of the constant temperature water bath box cannot continue to stabilize each temperature, the test environment cannot reach the expected goal, and there is a problem of low calibration accuracy

Images