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RTD temperature detection system

A detection system, 1. RTD technology, applied in thermometers, measuring devices, measuring heat and other directions, can solve the problems of insufficient detection accuracy of RTD temperature detection system, high cost, restricting the popularization and use of RTD temperature detection system, etc., and achieve strong practical value , The effect of high temperature detection accuracy and small volume

Inactive Publication Date: 2014-05-21
姜韫英
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Problems solved by technology

However, the detection element of the RTD has a self-heating effect, which will change the resistance value of the RTD and bring measurement errors to the system, and the resistance value of the RTD changes little with temperature, so it is very important to choose an A / D converter, and its performance is directly related to Affects the performance indicators of the entire control system
[0003]The detection accuracy of the existing RTD temperature detection system is not enough, and the cost is high, which limits the promotion and use of the RTD temperature detection system

Method used

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Embodiment Construction

[0011] As shown in the figure, the present invention includes a signal conditioning module, an A / D sampling conversion module, an RS485 serial communication module, an LED display module, and a DSP chip. The output port of the / D sampling conversion module is connected, and the input port of the A / D sampling conversion module is connected with the output port of the signal conditioning module.

[0012] The DSP chip adopts DSPIC30F microprocessor.

[0013] The A / D sampling conversion module adopts MCP3551 chip. The MCP3551 chip is a high-precision, low-noise, wide dynamic range, single-channel 22-bit resolution A / D converter powered by a single power supply (2.7-5.5V). Working under certain conditions, it is convenient to measure low-frequency and low-voltage signals.

[0014] The RS485 serial communication module communicates through the MAX485 chip. The main control machine is in the remote control room, and the interference is small, so the MAX485 chip is used to ...

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Abstract

The invention belongs to temperature detection system technical field and especially relates to a RTD temperature detection system with high detection precision, a powerful anti-interference capability, and low cost. The RTD temperature detection system comprises a signal conditioning module, an A / D sampling and converting module, an RS485 serial communication module, an LED display module, and a DSP chip. The structural features of the RTD temperature detection system are that the ports of the DSP chip are connected with the port of the RS485 serial communication module, the port of the LED display module, and the output port of the A / D sampling and converting module, and that the input port of the A / D sampling and converting module is connected with the output port of the signal conditioning module.

Description

technical field [0001] The invention belongs to the technical field of temperature detection systems, in particular to an RTD temperature detection system. Background technique [0002] In the temperature detection system, temperature sensors, analog-to-digital converters, and amplifiers are all very important devices. Because the resistance temperature detector (RTD) has the characteristics of high linearity, good stability, high precision, and reusability, so RTDs are widely used in areas such as cold junction compensation, bridge temperature, calibration, and process control. However, the detection element of the RTD has a self-heating effect, which will change the resistance value of the RTD and bring measurement errors to the system, and the resistance value of the RTD changes little with temperature, so it is very important to choose an A / D converter, and its performance is directly related to Affects the performance indicators of the entire control system. [0003] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01K7/16
Inventor 姜韫英童琳傅乃文
Owner 姜韫英
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