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Intelligent pressure transmitter

A transmitter and pressure technology, which is applied in the direction of fluid pressure measurement by changing ohmic resistance, and the measurement of the property and force of piezoresistive materials, can solve the problems of programming complexity, temperature drift, zero point drift, etc., and achieve good application Foreground, good zero point compensation characteristics, high precision effect

Inactive Publication Date: 2012-08-22
WUXI INST OF COMMERCE
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AI Technical Summary

Problems solved by technology

The output value of the traditional diffused silicon piezoresistive pressure sensor is not only determined by the input pressure, but also affected by the change of ambient temperature, so there are problems of zero point drift and temperature drift
The traditional temperature compensation method uses interpolation method and look-up table method, and the programming is more complicated

Method used

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Embodiment Construction

[0025] Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:

[0026] Such as figure 1 As shown, the present invention designs an intelligent pressure transmitter, which includes a pressure sensor, a signal amplifier, an A / D conversion module, a microcontroller, a digital temperature sensor, a D / A conversion module, a V / I conversion module, Display module, RS485 communication interface and power management module;

[0027] Preferably, the pressure sensor adopts a diffused silicon piezoresistive pressure sensor, such as the MPM280 pressure sensor of Mike Company, which can be used in the temperature range of -40 ° C to 80 ° C;

[0028] Preferably, the signal amplifier adopts chip INA121, which is a low-power, high-precision differential pressure amplifier;

[0029] Preferably, the A / D conversion module adopts an analog-to-digital conversion chip ADC0804;

[0030] Preferably, the digital temperature sensor ad...

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Abstract

The invention discloses an intelligent pressure transmitter, which is provided with a digital temperature sensor and a pressure sensor. Temperature signals and pressure data can be acquired in real time, the pressure data are converted by an A / D (analog / digital) conversion module and then transmitted to a microcontroller for processing together with the temperature signals, so that temperature compensation, zero drift compensation and nonlinear rectification are realized for the pressure sensor. The intelligent pressure transmitter can overcome the shortcoming of zero drift of a traditional pressure transmitter, and has an excellent zero drift compensation characteristic and a fine time drift suppression characteristic.

Description

technical field [0001] The invention relates to an intelligent pressure transmitter, which belongs to the technical field of instrument measurement. Background technique [0002] The pressure transmitter is required to output the industry standard 0~5V voltage signal or 4~20mA current signal, which requires a linear relationship with the measured pressure. The voltage output type transmitter has poor anti-interference ability, the damage of line loss, and the accuracy is not so high. Sometimes the output DC voltage is superimposed with AC components, which makes the single-chip microcomputer misjudgment, control errors, and serious cases. It will damage the equipment, and the output voltage signal of 0~5V cannot be transmitted remotely. After the remote transmission, the voltage drop of the line is large, and the accuracy is greatly reduced. Therefore, an intelligent pressure transmitter of the present invention is designed as a 4-20mA current output type. Accuracy is the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L1/18G01L9/02
Inventor 徐华军
Owner WUXI INST OF COMMERCE
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