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The Research of Metrological Testing Standard Device for Gas Detector

Author: WangHanBin
Tutor: YangJian
School: Chengdu University of Technology
Course: Measuring Technology and Instruments
Keywords: Gas detectors Test Signal acquisition The data processing
Type: Master's thesis
Year: 2011
Downloads: 30
Quote: 0
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Chemical gas is usually a high-pressure storage, multi-inflammable, explosive, toxic and hazardous characteristics. In order to prevent these dangers caused by gas production and production personnel safety hazards, installation of gas detectors and gas detectors performance testing is particularly important, and the gas detector indication error, response time, repeatability, drift The performance of the test is a basic research include chemical gas analysis, materials, electronics, communication technology, testing technology and data processing interdisciplinary. The subject developed gas detector measurement verification standard device can be applied to the industrial field, the production workshop of gas detectors, according to the national test procedures for performance testing to ensure its validity and reliability. Depth measurement verification standard developed method of gas detectors and related technologies, and achieved the following main results: (1) a multi-channel signal acquisition technology, data processing method, the high resolution of the small signal acquisition technology. Developed signal acquisition circuit, high resolution, through the SPI bus communication between the board, the five-gas detector output analog signal synchronous acquisition. Signal acquisition part and PC communication using a combination of Wi-Fi Internet communication technologies (Wi-Fi) and USB communication technology, to improve the effectiveness and flexibility of the means of communication. The gas detector output terminal of the fundamental output signal has the form of a voltage, current, frequency, etc., the majority of the current signal. Signal output range is generally common international standard: the current signal for the 4 to 20mA for 0 to 5V voltage signal, the frequency signal to 0 to 10kHz. The analog output of these detectors need to be converted into the corresponding digital signal converting circuit. Ultimately passed through the circuit board with the converted digital signal is transmitted to the data processing software for processing. Signal resolution of the design and development of signal acquisition circuit: current signal 0.01 mA; the 0.001V voltage signal; frequency signal is 1Hz. (2) Study on the electrical control of the device operation method primarily relates to the air pressure control, flow control, flow control, gas lead to off, the vacuum ventilation and status switch. Complete electrical control part of the design alignment. Electrical control system with touch screen and PLC control core with solenoid valves, pipelines, vacuum devices, relays, power supply, communication modules and other components, to achieve accreditation process control; manually by control and automatic control options for The operation of the staff to provide ease and convenience. (3) data acquisition and processing methods. Mainly related to: touch screen program, workstation, drivers, designing, writing, data processing and process control software to realize the automatic control of the certification process, automatic data collection, automatic calculation functions. MCGS configuration software development, PC control software, use Csharp language, written in VS2008 platform workstation software driver. Workstation software can parse the uploaded data acquisition board, the detector output signal. Measurement parameters, according to the requirements of the national measurement method and checking procedures to complete the evaluation of the performance of the detectors was seized. Combination of the above theoretical methods and design requirements, and finally completed the development of the gas detector measurement verification standard device \Proved by actual test, the instrument can meet the demand Metrological verification test. And has high accuracy, good stability and so on. Paper developed gas detector measurement verification standard device according to pre-programmed auto-complete the testing of the gas detectors; acquisition can signal Rd, convenient, improve test efficiency; reducing the manual errors that may exist to reduce the workload of the test, saving labor costs in the identification process; Wi-Fi Internet communication technology (Wi-Fi) and USB communication technology combined with the means of communication, the instrument operation, installation and more flexibility and can be easily networked, remote control, remote access to database resources and other functions; the automatic certificate system can reduce the complex quality control personnel records copying and finishing work, easy to save, which will help queries, thus greatly improving test efficiency. Gas detector test applies to the national legal metrology department work to improve the level of the test equipment industry in China.

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