Intelligent pressure transmitter and temperature compensation method thereof

A transmitter and pressure technology, applied in the direction of measuring fluid pressure, measuring fluid pressure through electromagnetic components, fluid pressure measurement by changing ohmic resistance, etc., can solve problems such as low integration, low reliability, and complex design

Inactive Publication Date: 2019-03-05
SHANGHAI RONGDE ENG EQUIP
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  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Intelligent pressure transmitter and temperature compensation method thereof
  • Intelligent pressure transmitter and temperature compensation method thereof
  • Intelligent pressure transmitter and temperature compensation method thereof

Examples

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Embodiment Construction

[0060] Example figure 1 As shown, the intelligent pressure transmitter of the present invention includes a diffused silicon pressure sensor 1, a microprocessor 2, a diode temperature sensor 3, a communication module 4 and a current DAC module 5, and the diffused silicon pressure sensor 1 and the diode temperature sensor 3 The output ends are respectively connected to the input ends of the signal conditioning circuit of the microprocessor 2, the programmable current source of the microprocessor 2 provides constant current drive for the diode temperature sensor 3, and the current-type DAC module 5 and the The microprocessor 2 is bidirectionally connected and outputs a current signal reflecting the pressure, and the communication module 4 is bidirectionally connected with the microprocessor 2 and transmits the pressure signal output by the microprocessor 2 .

[0061] Preferably, the transmitter also includes an RC filter 6, the output end of the diffused silicon pressure sensor 1...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L9/02
CPCG01L9/025
Inventor 许重军张国瑱李磊
Owner SHANGHAI RONGDE ENG EQUIP
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