Tecomperature compensation method for strain-type weighing sensor

Abstract

The present invention relates to a temperature compensation method for strain-type weighing sensor. Inside or near the weighing sensor, a temperature sensor is installed, the temperature sensor is calibrated in zero point temperature-zero point output and temperature-elastic modulus, and zero point temperature-zero point output curve and temperature-elastic modulus curve are created in the weighing display. The operation includes first zero point temperature compensation based on the zero point temperature-zero point output curve in the weighing display, the elastic modulus compensation based on the temperature-elastic modulus curve, and final converting the measured weight into true weight based on the weight reference calibration value in the weighing sensor.

Description

technical field [0001] The invention relates to temperature compensation for weighing instruments, in particular to a method for temperature compensation of electronic weighing instruments. Background technique [0002] As we all know, the resistance strain gauge pasted on the strain area of ​​the elastic element will form a Wheatstone bridge circuit, that is, the initial circuit of the load cell, according to the principle that the strain direction of the opposite arm is the same and the strain direction of the adjacent arm is opposite. A working load cell. Although this kind of sensor can be used, due to various internal factors and external environmental conditions, its output characteristics will greatly deviate from the ideal output characteristics, the main performance indicators are poor, and it cannot achieve high-accuracy weighing. Sensor technical requirements. In order to improve the comprehensive performance index of the load cell, var...

AI Technical Summary

Problems solved by technology

For areas with large temperature differences between day and night, electronic weighing instruments using strain gauge load cells can hardly be used outdoors

The key problem with the poor compensation effect of the circuit is that it is impossible to find a material or several materials that can completely offset the weighing error caused by the temperature change to the weighing instrument within the entire temperature range.