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Thermocouple cold-end thermostat device for portable field calibration and control method thereof

A technology of constant temperature device and on-site calibration, applied in auxiliary controller with auxiliary heating device, temperature control using electric method, measuring device, etc. and other problems, to achieve the effect of good temperature control effect, easy to carry, high temperature uniformity and stability

Inactive Publication Date: 2017-05-10
YANGZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This device has the following disadvantages: the hot end of the semiconductor refrigerator adopts a water cooling method, which is inconvenient to use; the conventional PID control mode of the analog circuit is used to control the silicon controlled rectifier to adjust the working current of the semiconductor refrigerator, and the conventional PID control method implemented by hardware PID control, its proportional coefficient, differential time and integral time constant are fixed, it is difficult to obtain the best control quality; measuring the natural aging of the bridge resistance element, its parameters will drift with time, and the controlled temperature will have a certain fluctuation after long-term use Deviation Affects Check Accuracy

Method used

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  • Thermocouple cold-end thermostat device for portable field calibration and control method thereof
  • Thermocouple cold-end thermostat device for portable field calibration and control method thereof

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Embodiment Construction

[0028] The present invention will be further described below in conjunction with accompanying drawing:

[0029] Such as Figure 1-2 As shown, a portable thermocouple cold-end constant temperature device for on-site calibration is composed of a 0°C constant temperature device and a control system; a 0°C constant temperature device consists of a thermostat 1, a semiconductor refrigerator 2, a thermostat Resistor 3, semiconductor cooler radiating cooler 4 and heat insulating material 5 are connected; semiconductor cooler 2 is composed of four coolers, TEC1, TEC2, TEC3, and TEC4, and the four coolers are respectively installed before and after the thermostat 1 On the left and right sides, the thermistor 3 is composed of four thermistors T1, T2, T3, and T4, and the four thermistors 3 are all embedded on the upper surface of the thermostat 1, and the heat dissipation radiator of the semiconductor refrigerator 4 is installed on the outside of each semiconductor refrigerator 2, and t...

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Abstract

The invention relates to a thermocouple cold-end thermostat device for portable field calibration and a control method thereof, and belongs to the technical field of thermocouple cold-end constant temperature control. The thermocouple cold-end thermostat device includes a 0-degree-centigrade thermostat and a control system. The 0-degree-centigrade thermostat includes a temperature equalizer, a semiconductor cooler, a thermistor and a semiconductor cooler radiator-cooler. The control system comprises four thermistor temperature sensors, a conditioning circuit, a microcontroller, four TEC driving circuits, a keyboard circuit, an LCD display circuit and a ZigBee module. The thermocouple cold-end thermostat method sets eight modes for the operation of the semiconductor cooler. The control system has high temperature uniformity and stability, completely meets the temperature field requirements of a thermocouple calibration reference-end thermostat, and is small in size, easy to carry, and suitable for field calibration because of the temperature equalizer and modular design,.

Description

technical field [0001] The invention belongs to the technical field of thermocouple cold-end constant temperature control, and relates to a portable field calibration thermocouple cold-end constant temperature device and a control method thereof. Background technique [0002] The current popular semiconductor zero-degree automatic constant temperature adopts a structure in which the cold end of the thermocouple is directly inserted into the 0°C temperature field. This device has the following disadvantages: the hot end of the semiconductor refrigerator adopts a water cooling method, which is inconvenient to use; the conventional PID control mode of the analog circuit is used to control the silicon controlled rectifier to adjust the working current of the semiconductor refrigerator, and the conventional PID control method implemented by hardware PID control, its proportional coefficient, differential time and integral time constant are fixed, it is difficult to obtain the bes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01K15/00G05D23/32
CPCG01K15/002G01K15/005G05D23/32
Inventor 杨鹏李敏艳
Owner YANGZHOU UNIV
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