Main board for thermometer and thermocouple precision correcting method

A technology of thermocouples and thermometers, applied in thermometers, measuring heat, and using electrical devices, etc., can solve the problems that the interface circuit of the main board has no expansion function, measurement error affects the temperature measurement accuracy, and is unsafe, so as to achieve a simple structure , avoid nonlinear error, easy to operate

Inactive Publication Date: 2010-09-29
北京市科海龙华工业自动化仪器有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Due to the complex working conditions of the current smelting metal melt thermometer, the thermometer used must be easy to operate, stable and reliable; and the current thermometer often needs to set parameters, and the parameter setting adopts the method of row Type multi-position dial, needs to open the case to operate on the main board, which is neither convenient nor safe, and the interface circuit of the main board has no expansion function. With the advancement of technology, functions need to be continuously added, so the interface circuit on the main board should meet expansion needs
And the thermocouple measurement accuracy calibration of the current motherboard still uses the traditional analog circuit calibration. During the calibration, the potentiometer of the control circuit in the motherboard needs to be adjusted to calibrate. Due to vibration during use, the resistance value of the potentiometer will change slightly. Since this small change changes the correction potential, measurement errors occur and affect the measurement accuracy of temperature measurement

Method used

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  • Main board for thermometer and thermocouple precision correcting method
  • Main board for thermometer and thermocouple precision correcting method
  • Main board for thermometer and thermocouple precision correcting method

Examples

Experimental program
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Embodiment 1

[0034] An embodiment of a motherboard for a thermometer, see figure 1 with figure 2 , the mainboard includes a main control circuit 1 containing a microprocessor and a peripheral circuit, and the peripheral circuit includes a dial input circuit 2 and an interface circuit with at least two slots 3, a thermocouple sampling circuit 4; the thermocouple The sampling circuit includes a temperature measurement control circuit 4-1, an A / D conversion circuit 4-2 and a zero compensation circuit 4-3; the slot is a 26-line double-sided straight slot, and the present embodiment is three 26-line Double sided straight slot.

[0035] The temperature measurement control circuit includes a double-way multi-position switch 4-1-1 and a standard power supply 4-1-2, wherein the standard power supply provides the standard calibration full-scale potential and zero potential of the thermocouple; the double-way multi-position switch is Two-way four-choice non-contact switch circuit, in which the sel...

Embodiment 2

[0043] An embodiment of a method for correcting the accuracy of thermocouples on the motherboard of a thermometer, see Example 1: the method includes zero point calibration and thermocouple full scale calibration, and the specific steps include:

[0044] a. Receive a zero potential, that is, the main control circuit outputs zero potential to the microprocessor by controlling the temperature measurement control circuit;

[0045] b. Judging whether it is a negative potential, if it is a negative potential, the microprocessor outputs a control signal to the A / D conversion circuit to change the reference point of the amplifier to make it a positive potential;

[0046]c. Save the measured positive bias potential to the zero point calibration register;

[0047] d. Measure a calibration thermocouple potential value;

[0048] e. Subtract the measured calibration thermocouple potential value from the data in the zero-point correction register to obtain the full-scale value of the ther...

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Abstract

The invention relates to a main board for a thermometer and a thermocouple precision correcting method; the main board comprises a main control circuit consisting of a microprocessor, a dial-up input circuit, an interface circuit with at least two slots and a thermocouple sampling circuit; the invention controls the line structure of the sampling circuit with an A/D conversion circuit, reduces the line interference between digital and analog circuits, adds a zero calibration compensation circuit on the front end of the A/D conversion circuit and improves the accuracy of temperature measurement; the invention has the benefits that a bus-type interface circuit is adopted, and a plurality of interface circuit sockets are arranged to realize the extendibility of functions; the A/D conversion circuit is connected with the control end of the analog circuit, thereby reducing the connecting lines between the digital and the analog circuits, reducing the interference of the analog circuit to the digital circuit, and improving the work reliability; and the invention adds the zero calibration compensation circuit, so that when a zero point tends to be negative, the adjustment is very convenient, thereby preventing nonlinear zero-crossing error, and improving the accuracy of temperature measurement.

Description

technical field [0001] The invention belongs to a thermal engineering temperature measuring device for a metallurgical furnace, in particular to a main board for a temperature measuring instrument and a method for correcting the accuracy of a thermocouple. Background technique [0002] Due to the complex working conditions of the current smelting metal melt thermometer, the thermometer used must be easy to operate, stable and reliable; and the current thermometer often needs to set parameters, and the parameter setting adopts the method of row Type multi-position dial, needs to open the case to operate on the main board, which is neither convenient nor safe, and the interface circuit of the main board has no expansion function. With the advancement of technology, functions need to be continuously added, so the interface circuit on the main board should meet expansion needs. And the thermocouple measurement accuracy calibration of the current motherboard still uses the tradi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01K7/02G01K15/00
Inventor 张荣才叶俊林
Owner 北京市科海龙华工业自动化仪器有限公司
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