Intelligent pressure transmitter and temperature compensation method thereof

Abstract

The invention discloses an intelligent pressure transmitter and a temperature compensation method thereof. The output ends of pressure and temperature sensors of the transmitter are connected with theinput end of a signal conditioning circuit of a microprocessor, a programmable current source of the microprocessor provides current-constant driving for the temperature sensor, a current type DAC module is connected with the microprocessor bidirectionally and outputs a current signal, and a communication module is connected with the microprocessor bidirectionally and outputs a pressure signal output by the microprocessor. The pressure transmitter is arranged in a high and low temperature box, and set high-temperature, normal-temperature and low-temperature points to collect sample data, temperature compensation is carried out on output nonlinearity of hot zero drift and hot sensitivity drift of the pressure sensor by means of data processing, and a temperature compensation combined pressure calculation formula is obtained. The transmitter is simple in structure and high in integrated degree, small signals can be amplified effectively, the method can be used to carry out temperature compensation on zero and sensitivity hot drift of the sensor, and the output precision of the transmitter in the total temperature range can be ensured.

Description

technical field [0001] The invention relates to an intelligent pressure transmitter and a temperature compensation method thereof. Background technique [0002] At present, the sensors used for pressure transmitters have serious deficiencies in many aspects, such as large structural size, non-linear input and output characteristics, and measurement values ​​are susceptible to drift due to changes in environmental conditions. The measurement principle of the diffused silicon pressure sensor is: the pressure of the measured medium directly acts on the stainless steel or ceramic diaphragm of the sensor, causing the diaphragm to produce a micro-displacement proportional to the medium pressure, thereby changing the resistance value of the sensor, and the bridge A voltage signal proportional to the pressure is generated, and the pressure transmitter collects the differential voltage signal output by the diffused silicon pressure sensor. Since the output differential voltage signa...

AI Technical Summary

Problems solved by technology

Traditional pressure transmitters generally adopt the discrete design of operational amplifiers, with many components and complex designs, low integration and low reliability

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