CN201345156Y - Toxic gas detecting alarm - Google Patents
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- CN201345156Y CN201345156Y CNU2008202341759U CN200820234175U CN201345156Y CN 201345156 Y CN201345156 Y CN 201345156Y CN U2008202341759 U CNU2008202341759 U CN U2008202341759U CN 200820234175 U CN200820234175 U CN 200820234175U CN 201345156 Y CN201345156 Y CN 201345156Y
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- 239000002341 toxic gas Substances 0.000 title abstract description 7
- 238000006243 chemical reaction Methods 0.000 claims abstract description 15
- 238000001514 detection method Methods 0.000 claims abstract description 13
- 230000005284 excitation Effects 0.000 claims description 14
- 231100000614 poison Toxicity 0.000 claims description 5
- 230000007096 poisonous effect Effects 0.000 claims description 5
- 230000006641 stabilisation Effects 0.000 claims description 3
- 238000011105 stabilization Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 8
- 238000005516 engineering process Methods 0.000 description 9
- 239000007789 gas Substances 0.000 description 7
- 239000004973 liquid crystal related substance Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000012937 correction Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 230000005669 field effect Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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Abstract
本实用新型公开了一种两线制本安型/防爆型有毒气体检测报警器，其包括：电化学传感器电路、微处理器、温度传感器、显示器、4－20mA电流信号电路以及电源电路，其中：电化学传感器电路的输出经模数转换后接微处理器的输入；温度传感器的输出经模数转换后接微处理器的输入；微处理器的输出接显示器；微处理器的输出经数模转换后接4－20mA电流信号电路的输入。该报警器测量精度高、抗干扰性能强，克服了现有技术中存在的温漂、时漂、误报警等缺点，可完全满足工业现场测量的要求。
The utility model discloses a two-wire intrinsically safe/explosion-proof toxic gas detection alarm, which comprises: an electrochemical sensor circuit, a microprocessor, a temperature sensor, a display, a 4-20mA current signal circuit and a power supply circuit, wherein : The output of the electrochemical sensor circuit is connected to the input of the microprocessor after analog-to-digital conversion; the output of the temperature sensor is connected to the input of the microprocessor after the analog-to-digital conversion; the output of the microprocessor is connected to the display; After the mode conversion, connect to the input of the 4-20mA current signal circuit. The alarm has high measurement accuracy and strong anti-interference performance, overcomes the shortcomings of temperature drift, time drift, and false alarms in the prior art, and can fully meet the requirements of industrial field measurement.
Description
技术领域 technical field
本实用新型涉及一种有毒气体检测报警器，属于工业测量仪表/安防仪表技术领域。The utility model relates to a toxic gas detection alarm, which belongs to the technical field of industrial measuring instruments/security instruments.
背景技术 Background technique
目前国内的毒气体检测报警器存在着测量精度差、抗干扰性能差、温漂、时漂、误报警等缺点，不能完全满足工业现场测量的要求。At present, domestic poisonous gas detection alarms have shortcomings such as poor measurement accuracy, poor anti-interference performance, temperature drift, time drift, and false alarms, which cannot fully meet the requirements of industrial on-site measurement.
实用新型内容 Utility model content
鉴于上述，本实用新型的目的是提供一种有毒气体检测报警器，它将工业测量仪表的两线制技术以本安/防爆形式应用到有毒气体检测领域当中，以克服现有技术存在的缺点和不足。In view of the above, the purpose of this utility model is to provide a toxic gas detection alarm, which applies the two-wire technology of industrial measuring instruments to the field of toxic gas detection in an intrinsically safe/explosion-proof form, so as to overcome the shortcomings of the prior art and insufficient.
为实现上述目的，本实用新型采用以下技术方案：In order to achieve the above object, the utility model adopts the following technical solutions:
一种有毒气体检测报警器，其特征在于包括：电化学传感器电路、微处理器、温度传感器、显示器、4-20mA电流信号电路以及电源电路，其中：A toxic gas detection alarm is characterized by comprising: an electrochemical sensor circuit, a microprocessor, a temperature sensor, a display, a 4-20mA current signal circuit and a power supply circuit, wherein:
所述电化学传感器电路的输出经模数转换后接所述微处理器的输入；The output of the electrochemical sensor circuit is connected to the input of the microprocessor after analog-to-digital conversion;
所述温度传感器的输出经模数转换后接所述微处理器的输入；The output of the temperature sensor is connected to the input of the microprocessor after analog-to-digital conversion;
所述微处理器的输出接所述显示器；The output of the microprocessor is connected to the display;
所述微处理器的输出经数模转换后接所述4-20mA电流信号电路的输入。The output of the microprocessor is connected to the input of the 4-20mA current signal circuit after digital-to-analog conversion.
所述电化学传感器电路包括电化学传感器、激励源、放大器，其中：所述激励源为所述电化学传感器提供激励电压；所述电化学传感器的输出接所述放大器；所述放大器的输出模数转换后接所述微处理器的输入。The electrochemical sensor circuit includes an electrochemical sensor, an excitation source, and an amplifier, wherein: the excitation source provides an excitation voltage for the electrochemical sensor; the output of the electrochemical sensor is connected to the amplifier; the output module of the amplifier The digital conversion is followed by the input of the microprocessor.
所述微处理器的串行接口接所述显示器。The serial interface of the microprocessor is connected to the display.
所述电源电路由整流稳压电路和电源控制芯片串联构成。The power supply circuit is composed of a rectification and voltage stabilization circuit and a power supply control chip connected in series.
本实用新型具有以下优点：The utility model has the following advantages:
硬件采用微功耗器件，报警器的功耗低；The hardware adopts micro-power consumption devices, and the power consumption of the alarm is low;
利用高精度、低漂移的运算放大器提高报警器测量的精度，解决了测量过程中的误报警问题；Using high-precision, low-drift operational amplifiers to improve the accuracy of alarm measurement and solve the problem of false alarms in the measurement process;
采用抗干扰性能强的微处理单片机，可提高报警器的抗干扰性能。The anti-interference performance of the alarm can be improved by adopting a micro-processing single-chip microcomputer with strong anti-interference performance.
利用温度传感器对测量现场周围的温度进行实时测量，故可解决电化学传感器的温度非线性和温度漂移；The temperature sensor is used to measure the temperature around the measurement site in real time, so the temperature nonlinearity and temperature drift of the electrochemical sensor can be solved;
由于采用微处理器，因而可利用零点自动跟踪软件技术解决报警器的时漂问题以及利用数字滤波技术解决报警器的稳定性。Due to the use of a microprocessor, the zero-point automatic tracking software technology can be used to solve the time drift problem of the alarm and the digital filtering technology can be used to solve the stability of the alarm.
附图说明 Description of drawings
图1为本实用新型的组成框图；Fig. 1 is a block diagram of the utility model;
图2为电化学传感器的电路原理图；Fig. 2 is the circuit principle diagram of electrochemical sensor;
图3为系统电路原理图。Figure 3 is a schematic diagram of the system circuit.
具体实施方式 Detailed ways
下面结合附图作进一步说明。Further description will be made below in conjunction with the accompanying drawings.
图1所示，是本实用新型的组成框图。包括：电化学传感器电路、微处理器、温度传感器、显示器、4-20mA电流信号电路以及电源电路。其中：Shown in Fig. 1, is the composition block diagram of the present utility model. Including: electrochemical sensor circuit, microprocessor, temperature sensor, display, 4-20mA current signal circuit and power supply circuit. in:
电化学传感器电路包括电化学传感器、激励源、放大器，激励源为电化学传感器提供激励电压，电化学传感器的输出接放大器，该放大器的输出经模数转换后接微处理器的输入；The electrochemical sensor circuit includes an electrochemical sensor, an excitation source, and an amplifier. The excitation source provides an excitation voltage for the electrochemical sensor. The output of the electrochemical sensor is connected to the amplifier, and the output of the amplifier is connected to the input of the microprocessor after analog-to-digital conversion;
温度传感器的输出经模数转换后接微处理器的输入；The output of the temperature sensor is connected to the input of the microprocessor after analog-to-digital conversion;
微处理器的输出接显示器；The output of the microprocessor is connected to the display;
微处理器的输出经数模转换后接4-20mA电流信号电路的输入。The output of the microprocessor is connected to the input of the 4-20mA current signal circuit after digital-to-analog conversion.
如图2所示，电化学传感器电路包括电化学传感器、场效应管V1、激励源IC1A、放大器IC1B，电化学传感器与J1连接。激励源IC1A为电化学传感器提供激励电压，电化学传感器的输出接放大器IC1B的负输入端，放大器IC1B的正输入端接有由稳压管D1构成的基准源电路。放大器IC1B的输出经J2送出至微处理器。接在电化学传感器2、3脚之间的场效应管V1用以加快电化学传感器响应速度。As shown in Figure 2, the electrochemical sensor circuit includes an electrochemical sensor, a field effect transistor V1, an excitation source IC1A, and an amplifier IC1B, and the electrochemical sensor is connected to J1. The excitation source IC1A provides the excitation voltage for the electrochemical sensor, the output of the electrochemical sensor is connected to the negative input terminal of the amplifier IC1B, and the positive input terminal of the amplifier IC1B is connected to a reference source circuit composed of a regulator tube D1. The output of the amplifier IC1B is sent to the microprocessor via J2. The field effect tube V1 connected between
如图3所示，微处理器IC4中包含A/D、D/A、E2ROM、温度监测、看门狗等大规模集成电路。图2中放大器IC1B的输出经图中的探头插座J3接入微处理器IC4的AINO脚。微处理器IC4的数字量输出经其串行接口PLO-PL4接到液晶显示器的插座J4，微处理器IC4的模拟量输出经其DACO脚接至放大器IC3的输入，放大器IC3的输出接驱动器BG1，放大器IC3和驱动器BG1构成了4-20mA电流信号电路。电源电路由D1-D4及BG1组成的整流稳压电路和电源控制芯片IC2串联构成。在图3中：J4为编程器插座，J2为交流电源插座。As shown in Figure 3, the microprocessor IC4 includes large-scale integrated circuits such as A/D, D/A, E 2 ROM, temperature monitoring, and watchdog. The output of the amplifier IC1B in Figure 2 is connected to the AINO pin of the microprocessor IC4 through the probe socket J3 in the figure. The digital output of the microprocessor IC4 is connected to the socket J4 of the liquid crystal display through its serial interface PLO-PL4, the analog output of the microprocessor IC4 is connected to the input of the amplifier IC3 through its DACO pin, and the output of the amplifier IC3 is connected to the driver BG1 , Amplifier IC3 and driver BG1 constitute a 4-20mA current signal circuit. The power supply circuit is composed of a rectification and voltage stabilization circuit composed of D1-D4 and BG1 and a power supply control chip IC2 connected in series. In Figure 3: J4 is the programmer socket, and J2 is the AC power socket.
本实用新型报警器中采用了以下硬件和软件技术：Adopted following hardware and software technology in the utility model alarm:
1.微功耗技术：包括电源控制(图3中的IC2)、放大器(图2中的IC1B)、基准源(图2中的D1)、微处理器(图3中的IC1)、4-20mA恒流源(图3中的IC3和BG1)、液晶显示器(图3中的J4)等硬件装置都采用微功耗器件。以实现两线制(既被测信号的电流输出和电源共用两条线)信号传输所必备的先决条件。1. Micro power consumption technology: including power control (IC2 in Figure 3), amplifier (IC1B in Figure 2), reference source (D1 in Figure 2), microprocessor (IC1 in Figure 3), 4- 20mA constant current source (IC3 and BG1 in Figure 3), liquid crystal display (J4 in Figure 3) and other hardware devices all use micro-power consumption devices. In order to realize the necessary prerequisites for signal transmission of the two-wire system (the current output of the measured signal and the power supply share two wires).
2.模拟信号采集技术：硬件包括为电化学传感器(图2中的J1)工作所需的激励电路(图2中的IC1A)和传感器微弱信号放大电路。2. Analog signal acquisition technology: The hardware includes the excitation circuit (IC1A in Figure 2) and the sensor weak signal amplification circuit required for the electrochemical sensor (J1 in Figure 2).
3.模拟/数字变换技术：硬件包括A/D变换器(图3中的IC4以下同)、软件包括数字滤波程序。3. Analog/digital conversion technology: the hardware includes an A/D converter (IC4 in Fig. 3 is the same below), and the software includes a digital filter program.
4.非线性修正技术：硬件包括温度传感器信号的采集、软件包括温度曲线的非线性修正。4. Non-linear correction technology: the hardware includes the acquisition of temperature sensor signals, and the software includes the nonlinear correction of the temperature curve.
5.零点自动跟踪技术：包括自稳零程序。5. Zero automatic tracking technology: including self-stable zero program.
6.抗干扰技术：硬件包括看门狗(图3中的IC4)、软件包括防程序死循环控制程序。6. Anti-interference technology: the hardware includes a watchdog (IC4 in Figure 3), and the software includes an anti-program infinite loop control program.
下面说明本实用新型的工作原理：The working principle of the present utility model is illustrated below:
本报警器的电路采用“两线制”工作方式，为其供电的两条电源线中的供电电流即为被测气体浓度相对应的电流信号。硬件采用包含A/D、D/A(图3中的IC1以下同)、E2ROM、温度监测等大规模集成电路组成的微处理器、放大电路、4-20mA恒流源驱动电路以及电源控制电路等。软件采用数字滤波、零点自动跟踪、温度非线性修正等技术对报警器的温漂、时漂进行实时修正。The circuit of this alarm adopts the "two-wire system" working mode, and the power supply current in the two power lines for power supply is the current signal corresponding to the concentration of the gas to be measured. The hardware adopts a microprocessor composed of large-scale integrated circuits including A/D, D/A (IC1 in Figure 3 is the same below), E 2 ROM, temperature monitoring, etc., an amplifier circuit, a 4-20mA constant current source drive circuit and a power supply control circuit, etc. The software uses digital filtering, zero point automatic tracking, temperature nonlinear correction and other technologies to correct the temperature drift and time drift of the alarm in real time.
在工作中随时对电化学传感器输出信号进行监测，当浓度值超过预设的报警值时，通过LCD液晶显示器发出报警信号。在监测被测气体浓度的同时也对环境温度进行监测，并根据监测到的不同环境温度，利用软件对电化学传感器的输出信号进行温度非线性修正。当被测气体浓度值超过报警器标称值的105％时，报警器将通过LCD液晶显示器给出超量程的显示提示，并通过4～20mA电路输出与显示值相对应的信号。当由于外界环境温度或其他因素引起报警器的零点负漂移值小于满量程的-5％时，报警器将通过LCD液晶显示器给出欠量程的显示提示，并通过4～20mA电路输出与显示值相对应的信号。当发现故障时，报警器将通过LCD液晶显示器给出故障报警提示，并通过4～20mA电路输出相应的信号(小于2mA)，以通知终端。Monitor the output signal of the electrochemical sensor at any time during work, and when the concentration value exceeds the preset alarm value, an alarm signal will be sent through the LCD liquid crystal display. While monitoring the measured gas concentration, the ambient temperature is also monitored, and according to the monitored different ambient temperatures, the output signal of the electrochemical sensor is used to correct the temperature nonlinearity. When the measured gas concentration exceeds 105% of the nominal value of the alarm, the alarm will give a display prompt of over-range through the LCD liquid crystal display, and output a signal corresponding to the displayed value through a 4-20mA circuit. When the zero negative drift value of the alarm is less than -5% of the full scale due to the external environment temperature or other factors, the alarm will give a display prompt of under-range through the LCD liquid crystal display, and output through a 4-20mA circuit to match the displayed value. corresponding signal. When a fault is found, the alarm will give a fault alarm prompt through the LCD liquid crystal display, and output a corresponding signal (less than 2mA) through the 4-20mA circuit to notify the terminal.
本报警器的检测元件采用进口原装电化学式传感器。在其激励电压的作用下，当周围环境中发生有毒气体泄漏时，传感器的输出也随之增加，经过放大器的放大之后进入微处理器中的A/D模数转换器变换成为数字信号，微处理器对此数字信号进行采集、处理、控制，将测量结果显示于LCD液晶窗口，并通过恒流源的驱动，输出与显示相对应的4～20mA信号。当被测气体浓度达到报警点时，液晶显示器给出报警提示。它可以与能接收4～20mA标准信号的任何仪表或计算机系统联机运行。The detection element of this alarm adopts the imported original electrochemical sensor. Under the action of its excitation voltage, when toxic gas leaks in the surrounding environment, the output of the sensor will also increase. After being amplified by the amplifier, it will be converted into a digital signal by the A/D analog-to-digital converter in the microprocessor. The processor collects, processes and controls the digital signal, displays the measurement result on the LCD window, and outputs a 4-20mA signal corresponding to the display through the drive of the constant current source. When the measured gas concentration reaches the alarm point, the LCD will give an alarm prompt. It can work with any instrument or computer system that can receive a standard 4-20mA signal.
本报警器根据国家标准GB12358-2006《作业场所环境气体检测报警仪通用技术要求》和中华人民共和国国家计量检定规程JJG915-1996《一氧化碳检测报警器》、JJG695-2003《硫化氢气体检测仪》进行研制及生产。是安全生产中的重要设备。The alarm is carried out in accordance with the national standard GB12358-2006 "General Technical Requirements for Environmental Gas Detection and Alarm Instruments in Workplaces" and the National Metrology Verification Regulations of the People's Republic of China JJG915-1996 "Carbon Monoxide Detection Alarm" and JJG695-2003 "Hydrogen Sulfide Gas Detector" Development and production. It is an important equipment in safe production.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102879435A (en) * | 2012-09-28 | 2013-01-16 | 华瑞科学仪器(上海)有限公司 | Small-size explosion-proof sensor for inflammable gas |
| CN103091378A (en) * | 2013-02-06 | 2013-05-08 | 贝谷科技股份有限公司 | Weak signal amplification circuit used for formaldehyde electrochemical sensor |
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- 2008-12-30 CN CNU2008202341759U patent/CN201345156Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102879435A (en) * | 2012-09-28 | 2013-01-16 | 华瑞科学仪器(上海)有限公司 | Small-size explosion-proof sensor for inflammable gas |
| CN103091378A (en) * | 2013-02-06 | 2013-05-08 | 贝谷科技股份有限公司 | Weak signal amplification circuit used for formaldehyde electrochemical sensor |
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