Method for setting temperature compensation factor of pressure sensor

Abstract

The invention relates to a method for setting a temperature compensation factor of a pressure sensor. An intelligent sensing module in the pressure sensor comprises a millivolt-level sensitive element module, an intelligent signal conditioning module and an internal parameter storage device in the intelligent signal conditioning module. The setting method comprises the following steps: providing a working environment for the intelligent sensing module by means of a pressure application unit and a temperature application unit; and connecting a measuring calculation and writing operation unit to the intelligent signal conditioning module for setting. In the method provided by the invention, two concise functions are used to express the relationship between the zero-point temperature drift compensation factor and the zero point as well as the relationship between the full-scale temperature drift compensation factor and the full scale, and the operating procedure is designed accordingly. By using the method, the required zero-point and full-scale temperature drift compensation factors can be calculated and written in the sensor to implement temperature compensation by simply measuring zero-point and full-scale output data at two temperature points. The method in the invention is very easy to implement in the actual production process, obviously simplifies the operation, optimizes the procedure and improves the production efficiency.

Description

technical field [0001] The invention relates to a process in the manufacturing process of a pressure sensor, in particular to a method for calculating and setting the temperature compensation coefficient of the pressure sensor. Background technique [0002] The pressure sensor is a very important device and instrument in the modern information industry. It linearly converts the pressure of the measured fluid in the industrial process into an electrical signal with a standard output such as 0.5-4.5V ratio output, 0-5V or 1-5V output. , 4-20mA output, etc. [0003] In fact, in addition to the parameter of sensing pressure, the output signal of the sensor also has many factors affected by the external environment and the resulting errors, the most common and significant of which is the change of external temperature The temperature error, referred to as temperature drift, is mainly reflected in two aspects, that is, the zero point temperature drift that affects the zero point ...

AI Technical Summary

Problems solved by technology

[0011] The application note of MAX1452 gives a scheme to determine two temperature compensation coefficients. However, this scheme is very complicated and difficult to understand in logic, and the implementation steps are very cumbersome and time-consuming, especially when it involves different compensation temperature points. Repeated calibration operations under the environment, and the measurement switching of multiple internal parameters is required, so that this scheme has no practical guiding significance in production, or the use of this scheme to guide production efficiency is low and the process is cumbersome

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