CN201345156Y - Toxic gas detecting alarm - Google Patents
Toxic gas detecting alarm Download PDFInfo
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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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Abstract
The utility model discloses a two-wire-system intrinsically-safe/explosion-proof toxic gas detecting 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 with the input of the microprocessor after analog-digital conversion; the output of the temperature sensor is connected with the input of the microprocessor after analog-digital conversion; the output of the microprocessor is connected with the display; the output of the microprocessor is connected with the 4-20mA current signal circuit after analog-digital conversion. The utility model has the advantages that the measurement accuracy of the detecting alarm is high, the anti-interference performance is high, the defects of temperature drift, time drift, false alarm and the like existing in the prior art are overcome and the detecting alarm can fully satisfy the requirements on the industrial field measurement.
Description
Technical field
The utility model relates to a kind of toxic gas detection alarm device, belongs to industrial instrument/security protection field of instrumentation technology.
Background technology
At present domestic poisonous gas detection alarm device exist that measuring accuracy is poor, interference free performance is poor, temperature is floated, the time float, shortcoming such as false alarm, can not satisfy the industry spot Testing requirement fully.
The utility model content
In view of above-mentioned, the purpose of this utility model provides a kind of toxic gas detection alarm device, and it is applied to the two-wire system technology of industrial instrument in the middle of the toxic gas detection range with intrinsic safety/explosion-proof form, to overcome the shortcoming and defect that prior art exists.
For achieving the above object, the utility model is by the following technical solutions:
A kind of toxic gas detection alarm device is characterized in that comprising: electrochemical sensor circuit, microprocessor, temperature sensor, display, 4-20mA current signal circuit and power circuit, wherein:
The output of described electrochemical sensor circuit connects the input of described microprocessor after analog to digital conversion;
The output of described temperature sensor connects the input of described microprocessor after analog to digital conversion;
The output of described microprocessor connects described display;
The output of described microprocessor connects the input of described 4-20mA current signal circuit after digital-to-analog conversion.
Described electrochemical sensor circuit comprises electrochemical sensor, driving source, amplifier, and wherein: described driving source provides driving voltage for described electrochemical sensor; The output of described electrochemical sensor connects described amplifier; Connect the input of described microprocessor after the output analog to digital conversion of described amplifier.
The serial line interface of described microprocessor connects described display.
Described power circuit is made of regulator rectifier circuit and power supply control chip series connection.
The utlity model has following advantage:
The hardware using micro-power device, alarm low in energy consumption;
Utilize the operational amplifier of high precision, low drift to improve the precision that alarm is measured, solved the false alarm problem in the measuring process;
Adopt the microprocessor microcontroller of strong anti-interference performance, can improve the interference free performance of alarm.
Utilize temperature sensor that the temperature around the measure field is measured in real time, so can solve the nonlinear temperature and the temperature drift of electrochemical sensor;
Owing to adopt microprocessor, thus can utilize zero point from the motion tracking software engineering solve alarm the time float problem and utilize digital filtering technique to solve the stability of alarm.
Description of drawings
Fig. 1 is a composition frame chart of the present utility model;
Fig. 2 is the circuit theory diagrams of electrochemical sensor;
Fig. 3 is the circuit system schematic diagram.
Embodiment
Be described further below in conjunction with accompanying drawing.
Shown in Figure 1, be composition frame chart of the present utility model.Comprise: electrochemical sensor circuit, microprocessor, temperature sensor, display, 4-20mA current signal circuit and power circuit.Wherein:
The electrochemical sensor circuit comprises electrochemical sensor, driving source, amplifier, and driving source provides driving voltage for electrochemical sensor, and the output of electrochemical sensor connects amplifier, and the output of this amplifier connects the input of microprocessor after analog to digital conversion;
The output of temperature sensor connects the input of microprocessor after analog to digital conversion;
The output of microprocessor connects display;
The output of microprocessor connects the input of 4-20mA current signal circuit after digital-to-analog conversion.
As shown in Figure 2, the electrochemical sensor circuit comprises electrochemical sensor, field effect transistor V1, driving source IC1A, amplifier IC1B, and electrochemical sensor is connected with J1.Driving source IC1A provides driving voltage for electrochemical sensor, and the output of electrochemical sensor connects the negative input end of amplifier IC1B, and the positive input terminal of amplifier IC1B is connected to the reference source circuit that is made of stabilivolt D1.The output of amplifier IC1B is sent to microprocessor through J2.Be connected on field effect transistor V1 between electrochemical sensor 2,3 pin in order to accelerate the electrochemical sensor response speed.
As shown in Figure 3, comprise A/D, D/A, E among the microprocessor IC4
2Large scale integrated circuits such as ROM, temperature monitoring, house dog.The probe socket J3 of the output of amplifier IC1B in figure inserts the AINO pin of microprocessor IC4 among Fig. 2.The socket J4 of LCD is received in the digital quantity output of microprocessor IC4 through its serial line interface PLO-PL4, the analog quantity output of microprocessor IC4 is connected to the input of amplifier IC3 through its DACO pin, the driver connected BG1 of the output of amplifier IC3, amplifier IC3 and driver BG1 have constituted 4-20mA current signal circuit.Power circuit is made of regulator rectifier circuit and the power supply control chip IC2 series connection that D1-D4 and BG1 form.In Fig. 3: J4 is a programmer socket, and J2 is an AC Power supply socket.
Adopted following hardware and software technology in the utility model alarm:
1. little power consumption technology: comprise that power supply control (IC2 among Fig. 3), amplifier (IC1B among Fig. 2), reference source (D1 among Fig. 2), microprocessor (IC1 among Fig. 3), 4-20mA constant current source (IC3 among Fig. 3 and BG1), LCD hardware units such as (J4 among Fig. 3) all adopt micro-power device.To realize that two-wire system (the both output of the electric current of measured signal and two lines of power sharing) signal transmits essential condition precedent.
2. collection of simulant signal technology: hardware is included as required exciting circuit (IC1A among Fig. 2) and the sensor feeble signal amplifying circuit of electrochemical sensor (J1 among Fig. 2) work.
3. analog/digital conversion technology: hardware comprises that A/D transducer (IC4 among Fig. 3 is as follows), software comprise digital filter program.
4. non-linear correction technique: hardware comprises that collection, the software of temperature sensor signal comprise the non-linear correction of temperature curve.
Zero point automatic tracking technique: comprise from steady zero program.
6. Anti-Jamming Technique: hardware comprises that house dog (IC4 among Fig. 3), software comprise anti-program closed-loop control program.
The following describes principle of work of the present utility model:
The circuit of this alarm adopts " two-wire system " working method, for the supply current in two power leads of its power supply is the corresponding current signal of tested gas concentration.Hardware using comprises A/D, D/A (IC1 among Fig. 3 is as follows), E
2Microprocessor, amplifying circuit, 4-20mA constant current source driving circuit and power control circuit etc. that large scale integrated circuit such as ROM, temperature monitoring is formed.Software adopt digital filtering, zero point from technology such as motion tracking, nonlinear temperature correction to the temperature of alarm float, time floats in real time and revises.
At any time the electrochemical sensor output signal is monitored at work, when concentration value surpasses default alarming value, send alerting signal by the LCD LCD.In the tested gas concentration of monitoring, also environment temperature is monitored, and, utilize software that the output signal of electrochemical sensor is carried out the nonlinear temperature correction according to the varying environment temperature that monitors.When tested gas concentration value surpass the alarm nominal value 105% the time, alarm will provide the display reminding of outrange by the LCD LCD, and by output of 4～20mA circuit and the corresponding signal of displayed value.When since ambient temperature or other factors cause the zero point of alarm negative drift value less than full scale-5% the time, alarm will provide the display reminding of owing range by the LCD LCD, and by output of 4～20mA circuit and the corresponding signal of displayed value.When finding fault, alarm will provide the fault alarm prompting by the LCD LCD, and export corresponding signal (less than 2mA) by 4～20mA circuit, with the notice terminal.
The detecting element of this alarm adopts the original-pack electrochemical transducer[sensor of import.Under the effect of its driving voltage, when the toxic gas leakage takes place in the surrounding environment when, the output of sensor also increases thereupon, the A/D analog to digital converter that enters in the microprocessor after the amplification through amplifier is for conversion into digital signal, microprocessor is gathered, handles, is controlled this digital signal, measurement result is shown in LCD liquid crystal window, and the driving by constant current source, output with show corresponding 4～20mA signal.When tested gas concentration reached alarm set point, LCD provided alarm.It can with any instrument that can receive 4～20mA standard signal or computer system on-line execute.
This alarm is developed and is produced according to standard GB 12358-2006 " requirement of operation site surrounding gas detecting and alarming instrument current techique " and the national metrological verification regulations JJG915-1996 of the People's Republic of China (PRC) " Carbon Monoxide Detection alarm ", JJG695-2003 " hydrogen sulfide gas detector ".It is the visual plant in the safety in production.
Claims (4)
1. toxic gas detection alarm device is characterized in that comprising: electrochemical sensor circuit, microprocessor, temperature sensor, display, 4-20mA current signal circuit and power circuit, wherein:
The output of described electrochemical sensor circuit connects the input of described microprocessor after analog to digital conversion;
The output of described temperature sensor connects the input of described microprocessor after analog to digital conversion;
The output of described microprocessor connects described display;
The output of described microprocessor connects the input of described 4-20mA current signal circuit after digital-to-analog conversion.
2. toxic gas detection alarm device as claimed in claim 1 is characterized in that:
Described electrochemical sensor circuit comprises electrochemical sensor, driving source, amplifier, wherein:
Described driving source provides driving voltage for described electrochemical sensor;
The output of described electrochemical sensor connects described amplifier;
Connect the input of described microprocessor after the output analog to digital conversion of described amplifier.
3. toxic gas detection alarm device as claimed in claim 1 is characterized in that:
The serial line interface of described microprocessor connects described display.
4. toxic gas detection alarm device as claimed in claim 1 is characterized in that:
Described power circuit is made of regulator rectifier circuit and power supply control chip series connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008202341759U CN201345156Y (en) | 2008-12-30 | 2008-12-30 | Toxic gas detecting alarm |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008202341759U CN201345156Y (en) | 2008-12-30 | 2008-12-30 | Toxic gas detecting alarm |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201345156Y true CN201345156Y (en) | 2009-11-11 |
Family
ID=41276740
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008202341759U Expired - Fee Related CN201345156Y (en) | 2008-12-30 | 2008-12-30 | Toxic gas detecting alarm |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201345156Y (en) |
Cited By (3)
| 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 |
| RU2558006C2 (en) * | 2013-11-06 | 2015-07-27 | Открытое акционерное общество "Ангарская нефтехимическая компания" | Alerter of critical pre-explosive concentrations |
-
2008
- 2008-12-30 CN CNU2008202341759U patent/CN201345156Y/en not_active Expired - Fee Related
Cited By (3)
| 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 |
| RU2558006C2 (en) * | 2013-11-06 | 2015-07-27 | Открытое акционерное общество "Ангарская нефтехимическая компания" | Alerter of critical pre-explosive concentrations |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20091111 Termination date: 20161230 |