CN2405221Y - Intelligent type device for detecting combustible gas - Google Patents
Intelligent type device for detecting combustible gas Download PDFInfo
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- CN2405221Y CN2405221Y CN 00227283 CN00227283U CN2405221Y CN 2405221 Y CN2405221 Y CN 2405221Y CN 00227283 CN00227283 CN 00227283 CN 00227283 U CN00227283 U CN 00227283U CN 2405221 Y CN2405221 Y CN 2405221Y
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Abstract
The utility model discloses an intelligent type device for detecting combustible gases, comprising a casing 1, a sensor 3, a circuit board 4, a display screen 44, glass 13 on the casing, a master control circuit 41, an amplifying circuit 45, a voltage/current conversion circuit 47, a sensor power supply 43 and a sensor protective circuit 431, wherein, the core of the master control circuit is a single chip computer. The device is also provided with a remote launch circuit 6 and a receiving circuit 49. Due to the adoptions of the control of the single chip computer, infrared remote eontrol, the protection of a built-in sensor, Chinese display, and high-precision signal amplifying and processing circuits, the utility model can generally realize the intellectualization of primary instruments on site, can optimize man-machine interfaces, can calibrate without unsealing, and can enhance the stability of instruments simultaneously.
Description
This detector relates to industrial gasses monitoring terminal equipment, particularly relates to fixed inflammable gas and detects primary instrument.
Ground such as oil, chemical industry factory, oil product warehouse are the multiple places that inflammable gas is revealed.Reveal the fire, the explosion accident that cause by inflammable gas and not only cause heavy economic losses, and often cause great personnel casualty accidents to enterprise.Therefore, the inflammable gas monitor and alarm system is one of essential safety monitoring system of petroleum chemical enterprise.Combustible gas detector generally is made up of two parts: the one, and sensor, another part are signal processing circuits.Sensor acquisition gas concentration signal, this signal be output 4-20mA current signal after circuit amplification, conversion process.
In the prior art, demarcation and the adjustment work regularly instrument carried out because there is drift in sensor signal must just can be finished under the situation that outage is uncapped.In addition, most instrument do not have on-the-spot the demonstration, or adopt pondered-over icon/English display interface.This gives bringing inconvenience of operating personnel.The weak point of conventional instrument also is: sensor and instrument are not taked safeguard measure, therefore be easy to burn sensor even internal circuit, thereby cause damage to the user.In addition, the stability of conventional instrument is relatively poor, and signal drift is serious, and this also is one of its deficiency.
The purpose of this utility model is to avoid above-mentioned the deficiencies in the prior art part and proposes the covered demarcation of a kind of energy, adopts the LCD display interface, the intelligent inflammable gas pick-up unit of built-in sensors protection; And adopt high-precision signal to amplify and treatment circuit, guarantee the stability of instrument.
The purpose of this utility model is achieved in that and manufactures and designs a kind of intelligent inflammable gas pick-up unit, comprises housing, and the combustible gas sensor that have pipeline communicate affixed with this housing is fixed on the circuit board in the housing; Described circuit board comprises LCD display; Clear glass is equipped with on described housing top.And described circuit board also comprises with the single-chip microcomputer being total control circuit of core, sensor signal amplifying circuit, voltage and probe power.Described probe power also comprises the sensor protection circuit.This device also comprises shaking to be controlled radiating circuit and shakes the control receiving circuit.
The drawing of accompanying drawing is described as follows:
Fig. 1 is the overall construction drawing of the intelligent inflammable gas pick-up unit of the utility model;
Fig. 2 is the master control circuit diagram of intelligent inflammable gas pick-up unit;
Fig. 3 is that intelligent inflammable gas pick-up unit probe power, signal amplify and translation circuit figure;
Fig. 4 is intelligent inflammable gas pick-up unit remote controlled transmitting circuit figure;
Fig. 5 is intelligent inflammable gas pick-up unit remote-control receiving circuit figure.
Embodiment below in conjunction with the intelligent inflammable gas pick-up unit of description of drawings the utility model.
A kind of intelligent inflammable gas pick-up unit comprises housing 1, and the combustible gas sensor 3 that have pipeline communicate affixed with this housing 1 is fixed on the circuit board 4 in the housing 1; Described circuit board 4 comprises the LCD display 44 of prior art; Clear glass 13 is equipped with on described housing 1 top; It is characterized in that:
Described circuit board 4 also comprises with the single-chip microcomputer being total control circuit 41 of core, sensor signal amplifying circuit 45, voltage 47 and probe power 43; Described probe power 43 also comprises sensor protection circuit 431.
Described intelligent inflammable gas pick-up unit also comprises shaking controls radiating circuit 6; Described circuit board 4 also comprises shaking controls receiving circuit 49.
Described total control circuit comprises chip microprocessor D1, crystal oscillator X1, capacitor C 1, C2, C3, C4, C7, and chip D2, D3, D4, D7, D5, D6, amplifier N2, resistance R 1, R2, R3, stabilivolt Z1.This instrument adopts Inte1 80196KC microcontroller.
The master control circuit diagram is referring to Figure 41.
In total control circuit 41, the 60th to 53 pin of single-chip microcomputer D1 is connected with D2, D3, D4, D5 and D6 respective foot according to the form below:
| | 60 | 59 | 58 | 57 | 56 | 55 | 54 | 53 |
| | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
| | 11 | 12 | 13 | 15 | 16 | 17 | 18 | 19 |
| D4 | 9 | 10 | 11 | 13 | 14 | 15 | 16 | 17 |
| D5 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 |
| | 7 | 6 | 5 | 4 | 16 | 15 | 14 | 13 |
46 to 52 pin of D1 connect 27,26,2,23,21,24,25 pin of EPROM D3 successively.
12 to 19 pin of latch D2 connect 3 to 10 pin of EPROM D3 successively.
19,22,23 and 1 to 8 pin of EPROM D4 connect 21,24,25 pin and 3 to 10 pin of D3 successively.
5 to 8 pin of LCD display driver D5 connect 12,19 pin of steering logic chip D7 and 8,7 pin of D4 successively.
1 to 5 pin of steering logic chip D7 connects 46,45,47,61 and 40 pin of described single-chip microcomputer D1 successively.
20,22 pin of D3 connect 16 pin of described steering logic chip D7 and 61 pin of D1 successively.
18,20,21 pin of D4 connect 14 pin of described steering logic chip D7 and the 61st, 40 pin of D1 successively.
1,2 pin of digital to analog converter D6 connect 13 pin of described steering logic chip D7 and 40 pin of D1 successively.
8 pin of D6 connect amplifier N2 in-phase input end 3 pin, and N2 output terminal the 6th pin connects inverting input 2 pin through resistance R 1, and through resistance R 3 ground connection, connect in-phase input end 5 pin of amplifier N4B simultaneously through the resistance R 35 of voltage 47.
Built-in ADC input end the 4th pin of single-chip microcomputer D1 meets the exit A of sensor 3, and the 5th pin connects the negative electrode of sensor signal amplifying circuit 45 Zener diode Z1; The I/O of single-chip microcomputer D1 holds 22 pin to connect the base stage of V2 through the resistance R 9 of probe power holding circuit 431.
15 pin of single-chip microcomputer D1 link to each other with output terminal 6 pin of remote-control receiving circuit 49 Schmidt trigger D9C;
The workflow of this total control circuit is: the single-chip microcomputer sensor-lodging is presented at it on LCD after A/D conversion and calculating concentration value.Concentration value after the 5S0 line outputs to the input end of circuit 47, is used for the usefulness of V/I conversion through the D/A conversion.Single-chip microcomputer simultaneously relatively this concentration whether surpass alarm limit, as surpassing then display alarm of alarm limit, if the gas concentration outrange then is changed to low level through the 3SP line with the base stage of probe power control signal end V2, thereby turn-offs probe power.Single-chip microcomputer by the 2S0 line gather, the state of sensor in the detection signal amplifying circuit 45, if find fault then turn-off probe power equally.Single-chip microcomputer simultaneously receives the control signal that telepilot is sent through the 4RS line, and enters corresponding control programs and finish the work, as: zeroising, calibrated span etc.
Described sensor signal amplifying circuit 45 is made up of two amplifier N3C, N3D and peripheral components thereof.
Wherein, one of input regulator potentiometer P3 fixing termination sensor R exit, connect the emitter of sensor electrical source circuit V3 simultaneously, another is termination sensors A exit fixedly, simultaneously connecting resistance R24 and diode Z2 negative electrode also meet the sampling potentiometer P2 of power circuit 43 and connect 4 pin of single-chip microcomputer D1; Ground connection after resistance R 24 other ends link to each other with diode Z2 anode; Through inverting input 11 pin and in-phase input end 12 pin of resistance R 5 and R4 access amplifier N3C, 12 pin of N3C also meet the reference voltage V of 0.80V through R2 respectively for the sliding end of input regulator potentiometer P3 and center sensor end C
REF, output terminal 10 pin connect inverting input 11 pin and ground connection through R3 and R1 respectively, also connect in-phase input end 14 pin of amplifier N3D through R7; Inverting input 15 pin of N3D meet adjustable resistance P1 and meet the reference voltage V of 0.80V through R8
REFAnother termination of P1 N3D exports 16 pin and connects 5 pin of single-chip microcomputer D1 and the negative electrode of diode Z1 through R27; The plus earth of Z1.
This circuit is delivered to the gas concentration signal of gathering the 5th pin of total control circuit 41 single-chip microcomputer D1 through the 1SI line.
Voltage 47 is made up of a voltage follower circuit and a V/I translation circuit.
Voltage follower circuit is made up of amplifier N4B and peripheral components R35 thereof.In-phase input end 5 pin of N4B connect N2 output terminal 6 pin through R35, and its inverting input 6 pin link to each other with output terminal 7 pin, and connect negative electrode and the capacitor C 4 of N4C in-phase input end 12, diode Z4, the anode of diode Z4 and capacitor C 4 other end ground connection through R18;
In the V/I translation circuit, the inverting input 11 pin connecting resistance R33 of amplifier N4C also meet the gate pole G of output terminal 10 pin and power MOS pipe V4 through C3; Another termination of R33 V4 source S, and through R32 ground connection; The V4 drain D connects the N4D in-phase input end, and connects R34 and diode Z3 anode through R31, and the Z3 negative electrode connects 24V Vcc power supply; The drain D of R34 other end power MOS pipe V5, the while connects inverting input 15 pin and the capacitor C 5 of N4D through R10; Another termination of C5 N4D output terminal 16 pin and V5 gate pole G; The V5 source S connects diode V6 anode; The V6 negative electrode is the output OUTPUT of this pick-up unit, and it is that codomain is the standard transducer signal of 4-20mA.
Above-mentioned amplifier N3, N4 adopt the integrated four-operational amplifier LT1079 of high stability, guarantee the high precision and the stability of this device.
Circuit 43 among Fig. 3 is the sensor electrical source circuit, and it is powered to sensor.And produce at the scene that high concentration is flooded or during sensor fault by sensor protection circuit 431 power cutoffs respectively, with the protection sensor.
In the sensor electrical source circuit 43,1 pin of power conversion chip N1 meets input voltage 24VVcc and filter capacitor C8, and its output terminal 2 pin connect diode V1 negative electrode and connect emitter and the sensor R exit of capacitor C 10 positive poles, triode V3 through inductance L 1; The V3 base stage connects+5V through R6, and its collector is through resistance R 25 ground connection with the C8 other end, V1 anode and after the C10 negative pole links to each other; 4 pin of amplifier N3A meet 24V Vcc, 13 pin ground connection; Its in-phase input end 3 pin access the sliding end of sample potentiometer P2, P2 other end ground connection through R20; Inverting input 2 pin of N3A also connect feedback input end 4 pin of N3A output terminal 1 pin and power conversion chip N1 through R21 ground connection through R22, the C1 of parallel connection.
The base stage of the triode V2 of described sensor protection circuit 431 connects 22 pin of single-chip microcomputer D1 through 3SP line and R9; The V2 grounded emitter, its collector connects+5V through R11, connects protection input end 5 pin of power conversion chip N1 simultaneously; During operate as normal, the 3SP line is a high level; When fault or guard mode, the 3SP line is a low level.
The described control receiving circuit 49 that shakes is finished the decoding work of infrared remote-controlled signal.Its infrared reception phototriode V66 collector meets the positive pole and the C81 of capacitor C 12, and connects+5V through L41, connects input 5 pin of Schmidt trigger D9C simultaneously; The emitter of V66 is with C12 negative pole, C81 other end ground connection; 6 pin meet described single-chip microcomputer D1 through the 4RS line 15 pin are exported in the paraphase of D9C.
The described control radiating circuit 6 that shakes is carried out keyboard-coding and launch mission.It contains infrared remote coding chip D8,8, the external crystal oscillator X61 of 9 pin, and 10 to 13 pin connect the end of pushbutton switch SW1 to SW3 and the SW4 that links to each other, SW5 successively; The other end of SW1 to SW5 connects 19 to 15 pin of described D8 successively; + 3V power supply connects 14 to 12 pin of D8 respectively through resistance R 61 to R63; 14 to 12 pin of D8 connect the anode of diode V63 to V61 again successively, and the negative electrode of three diodes connects the Css pin of D8 simultaneously; The 6th pin of described D8 also connects+3V, the anode of the optical diode of sending and receiving simultaneously V65 and the positive pole of capacitor C 63; The negative electrode of V65 connects the collector of triode V64, and the emitter of V64 is through the negative pole ground connection of R64 with C63; The base stage of V64 connects 5 pin of described D8.
Used vital part of the utility model such as following table:
| Circuit symbol | The element title | Model | The manufacturer |
| D1 | Single-chip microcomputer | Inte1 80C196KC | Inte1 |
| D2 | Latch | 74HC573 | |
| D3 | EPROM | AT29256 | ATMEL |
| D4 | EPROM | AT28C16 | ATMEL |
| D5 | The LCD display module | (general) | |
| D6 | Digital to analog converter | DAC0832 | |
| D7 | Programmable logic device (PLD) | ATF16V8 | ATMEL |
| D8 | The remote control coding circuit | PT2221 | SUMSUNG |
| D9 | Sheffer stroke gate | 7404 | |
| N2 | Operational amplifier | OP90 | |
| N1 | Supply convertor | LM2575 | NS |
| N3、N4 | Operational amplifier | LT1079 | LINEAR DEVICES |
Compared with prior art; the utility model has the advantage of and adopted Single-chip Controlling; infrared remote control; menu in Chinese shows; and sensor protection and the measures such as high performance signal amplification and translation circuit; round Realization the intellectuality of on-the-spot primary instrument, the man-machine interface of optimization has improved the stability of instrument simultaneously. This is that the utility model is to the significant contribution of fuel gas detection technique.
Claims (4)
1. an intelligent inflammable gas pick-up unit comprises housing (1), and the combustible gas sensor (3) that have pipeline communicate affixed with this housing (1) is fixed on the circuit board (4) in the housing (1); Described circuit board (4) comprises LCD display (44); Clear glass (13) is equipped with on described housing (1) top; It is characterized in that:
Described circuit board (4) also comprises with the single-chip microcomputer being total control circuit (41) of core, sensor signal amplifying circuit (45), voltage (47) and probe power (43); Described probe power (43) also comprises sensor protection circuit (431).
2. according to the described intelligent inflammable gas pick-up unit of claim 1, it is characterized in that:
Described intelligent inflammable gas pick-up unit also comprises shaking controls radiating circuit (6); Described circuit board (4) also comprises shaking controls receiving circuit (49).
3. according to the described intelligent inflammable gas pick-up unit of claim 2, it is characterized in that:
Described is that the 60th to 53 pin of single-chip microcomputer D1 is connected with D2, D3, D4, D5 and D6 respective foot according to the form below in total control circuit (41) of core with the single-chip microcomputer:
D1 60 59 58 57 56 55 54 53
D2 2 3 4 5 6 7 8 9
D3 11 12 13 15 16 17 18 19
D4 9 10 11 13 14 15 16 17
D5 9 10 11 12 13 14 15 16
D6 7 6 5 4 16 15 14 13
46 to 52 pin of D1 connect 27,26,2,23,21,24,25 pin of EPROM D3 successively;
12 to 19 pin of latch D2 connect 3 to 10 pin of EPROM D3 successively;
19,22,23 and 1 to 8 pin of EPROM D4 connect 21,24,25 pin and 3 to 10 pin of D3 successively;
5 to 8 pin of LCD display driver D5 connect 12,19 pin of steering logic chip D7 and 8,7 pin of D4 successively;
1 to 5 pin of steering logic chip D7 connects 46,45,47,61 and 40 pin of described single-chip microcomputer D1 successively;
20,22 pin of D3 connect 16 pin of described steering logic chip D7 and 61 pin of D1 successively;
18,20,21 pin of D4 connect 14 pin of described steering logic chip D7 and the 61st, 40 pin of D1 successively;
1,2 pin of digital to analog converter D6 connect 13 pin of described steering logic chip D7 and 40 pin of D1 successively;
8 pin of D6 connect amplifier N2 in-phase input end 3 pin, and N2 output terminal the 6th pin connects inverting input 2 pin through resistance R 1, and through resistance R 3 ground connection, connect in-phase input end 5 pin of amplifier N4B simultaneously through the resistance R 35 of voltage (47);
Built-in ADC input end the 4th pin of single-chip microcomputer D1 meets the exit A of sensor (3), and the 5th pin connects the negative electrode of sensor signal amplifying circuit (45) Zener diode Z1; The I/O of single-chip microcomputer D1 holds 22 pin to connect the base stage of V2 through the resistance R 9 of probe power holding circuit (431);
15 pin of single-chip microcomputer D1 link to each other with output terminal 6 pin of remote-control receiving circuit (49) Schmidt trigger D9C;
One of the input regulator potentiometer P3 of described sensor signal amplifying circuit (45) fixing termination sensor R exit, connect the emitter of sensor electrical source circuit V3 simultaneously, another is termination sensors A exit fixedly, simultaneously connecting resistance R24 and diode Z2 negative electrode also meet the sampling potentiometer P2 of power circuit (43) and connect 4 pin of single-chip microcomputer D1; Ground connection after resistance R 24 other ends link to each other with diode Z2 anode; Through inverting input 11 pin and in-phase input end 12 pin of resistance R 5 and R4 access amplifier N3C, 12 pin of N3C also meet the reference voltage V of 0.80V through R2 respectively for the sliding end of input regulator potentiometer P3 and center sensor end C
REF, output terminal 10 pin connect inverting input 11 pin and ground connection through R3 and R1 respectively, also connect in-phase input end 14 pin of amplifier N3D through R7; Inverting input 15 pin of N3D meet adjustable resistance P1 and meet the reference voltage V of 0.80V through R8
REFAnother termination of P1 N3D exports 16 pin and connects 5 pin of single-chip microcomputer D1 and the negative electrode of diode Z1 through R27; The plus earth of Z1;
In-phase input end 5 pin of described voltage (47) N4B connect N2 output terminal 6 pin through R35, its inverting input 6 pin link to each other with output terminal 7 pin, and connect negative electrode and the capacitor C 4 of N4C in-phase input end 12, diode Z4, the anode of diode Z4 and capacitor C 4 other end ground connection through R18;
The inverting input 11 pin connecting resistance R33 of amplifier N4C also meet the gate pole G of output terminal 10 pin and power MOS pipe V4 through C3; Another termination of R33 V4 source S, and through R32 ground connection; The V4 drain D connects the N4D in-phase input end, and connects R34 and diode Z3 anode through R31, and the Z3 negative electrode connects 24V VCC power supply; The drain D of R34 other end power MOS pipe V5, the while connects inverting input 15 pin and the capacitor C 5 of N4D through R10; Another termination of C5 N4D output terminal 16 pin and V5 gate pole G; The V5 source S connects diode V6 anode; The V6 negative electrode is the output OUTPUT of this pick-up unit;
1 pin of the power conversion chip N1 of described probe power (43) meets input voltage 24V Vcc and filter capacitor C8, and its output terminal 2 pin connect diode V1 negative electrode and connect emitter and the sensor R exit of capacitor C 10 positive poles, triode V3 through inductance L 1; The V3 base stage connects+5V through R6, and its collector is through resistance R 25 ground connection with the C8 other end, V1 anode and after the C10 negative pole links to each other; 4 pin of amplifier N3A meet 24V Vcc, 13 pin ground connection; Its in-phase input end 3 pin access the sliding end of sample potentiometer P2, P2 other end ground connection through R20; Inverting input 2 pin of N3A also connect feedback input end 4 pin of N3A output terminal 1 pin and power conversion chip N1 through R21 ground connection through R22, the C1 of parallel connection;
The base stage of the triode V2 of described sensor protection circuit (431) connects 22 pin of single-chip microcomputer D1 through R9; The V2 grounded emitter, its collector connects+5V through R11, connects protection input end 5 pin of power conversion chip N1 simultaneously;
Described shaking controlled positive pole and the C81 that the infrared reception phototriode of receiving circuit (49) V66 collector connects capacitor C 12, and connects+5V through L41, connects input 5 pin of Schmidt trigger D9C simultaneously; The emitter of V66 is with C12 negative pole, C81 other end ground connection; 15 pin that 6 pin meet described single-chip microcomputer D1 are exported in the paraphase of D9C;
The described control radiating circuit (6) that shakes contains infrared remote coding chip D8,8, the external crystal oscillator X61 of 9 pin, and 10 to 13 pin connect the end of pushbutton switch SW1 to SW3 and the SW4 that links to each other, SW5 successively; The other end of SW1 to SW5 connects 19 to 15 pin of described D8 successively; + 3V power supply connects 14 to 12 pin of D8 respectively through resistance R 61 to R63; 14 to 12 pin of D8 connect the anode of diode V63 to V61 again successively, and the negative electrode of three diodes connects the Css pin of D8 simultaneously; The 6th pin of described D8 also connects+3V, the anode of the optical diode of sending and receiving simultaneously V65 and the positive pole of capacitor C 63; The negative electrode of V65 connects the collector of triode V64, and the emitter of V64 is through the negative pole ground connection of R64 with C63; The base stage of V64 connects 5 pin of described D8.
4. according to the described intelligent inflammable gas pick-up unit of claim 3, it is characterized in that:
Described amplifying circuit N3, N4 are that model is the integrated four-operational amplifier of the high stability of LT1079.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00227283 CN2405221Y (en) | 2000-01-27 | 2000-01-27 | Intelligent type device for detecting combustible gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00227283 CN2405221Y (en) | 2000-01-27 | 2000-01-27 | Intelligent type device for detecting combustible gas |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2405221Y true CN2405221Y (en) | 2000-11-08 |
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ID=33590953
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00227283 Expired - Fee Related CN2405221Y (en) | 2000-01-27 | 2000-01-27 | Intelligent type device for detecting combustible gas |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2405221Y (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100387899C (en) * | 2006-04-07 | 2008-05-14 | 聚光科技（杭州）有限公司 | Gas transmitter operation control method and gas transmitter thereof |
| CN1916599B (en) * | 2005-08-18 | 2010-09-15 | 北京均方理化科技研究所 | Apparatus for calibrating gas detector in site, and method of gas distribution |
| CN101975798A (en) * | 2010-09-25 | 2011-02-16 | 淮南润成科技有限公司 | Carbon monoxide tester |
| CN101255948B (en) * | 2006-04-07 | 2012-06-13 | 聚光科技(杭州)股份有限公司 | Gas transmitter |
| CN102507847A (en) * | 2011-10-10 | 2012-06-20 | 李敏 | Full-intelligent voice digital independent combustible gas detector |
| CN102638026A (en) * | 2012-04-26 | 2012-08-15 | 成都安可信电子股份有限公司 | Ultralimit protection circuit and method of catalytic combustion gas sensor |
| CN104280425A (en) * | 2014-10-20 | 2015-01-14 | 中山市安领星电子科技有限公司 | Gas detector |
| CN104849405A (en) * | 2015-04-29 | 2015-08-19 | 无锡时和安全设备有限公司 | Intelligent gas detector adjusting system |
| CN104977318A (en) * | 2015-03-02 | 2015-10-14 | 深圳市卡卓无线信息技术有限公司 | Gas concentration detection method of carbon monoxide, formaldehyde and alcohol, and mobile terminal |
| CN105160826A (en) * | 2015-08-31 | 2015-12-16 | 胡国旺 | Combustible gas alarm controller |
| CN110220850A (en) * | 2019-06-10 | 2019-09-10 | 乔荟宁 | A kind of portable remote wireless methane detection acoustic-optic alarm |
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2000
- 2000-01-27 CN CN 00227283 patent/CN2405221Y/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1916599B (en) * | 2005-08-18 | 2010-09-15 | 北京均方理化科技研究所 | Apparatus for calibrating gas detector in site, and method of gas distribution |
| CN100387899C (en) * | 2006-04-07 | 2008-05-14 | 聚光科技（杭州）有限公司 | Gas transmitter operation control method and gas transmitter thereof |
| CN101255948B (en) * | 2006-04-07 | 2012-06-13 | 聚光科技(杭州)股份有限公司 | Gas transmitter |
| CN101975798A (en) * | 2010-09-25 | 2011-02-16 | 淮南润成科技有限公司 | Carbon monoxide tester |
| CN102507847A (en) * | 2011-10-10 | 2012-06-20 | 李敏 | Full-intelligent voice digital independent combustible gas detector |
| CN102638026A (en) * | 2012-04-26 | 2012-08-15 | 成都安可信电子股份有限公司 | Ultralimit protection circuit and method of catalytic combustion gas sensor |
| CN104280425A (en) * | 2014-10-20 | 2015-01-14 | 中山市安领星电子科技有限公司 | Gas detector |
| CN104977318A (en) * | 2015-03-02 | 2015-10-14 | 深圳市卡卓无线信息技术有限公司 | Gas concentration detection method of carbon monoxide, formaldehyde and alcohol, and mobile terminal |
| CN104849405A (en) * | 2015-04-29 | 2015-08-19 | 无锡时和安全设备有限公司 | Intelligent gas detector adjusting system |
| CN105160826A (en) * | 2015-08-31 | 2015-12-16 | 胡国旺 | Combustible gas alarm controller |
| CN110220850A (en) * | 2019-06-10 | 2019-09-10 | 乔荟宁 | A kind of portable remote wireless methane detection acoustic-optic alarm |
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