CN101210931A - Bus type combustible gas concentration detection device and control method thereof - Google Patents
Bus type combustible gas concentration detection device and control method thereof Download PDFInfo
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Abstract
The invention relates to a bus type combustible gas concentration detection device and a control method thereof, wherein the device comprises: the gas concentration detection part is connected with the detection input end of the control part; a control part including a microprocessor for receiving the detection signal of the gas concentration detection part and outputting the signal to the display part and the alarm part, wherein the microprocessor stores a control program; the display part is connected with the display output end of the control part; the operation part is connected with the operation input end of the control part; the alarm output part is provided with a sound alarm device and is connected to the alarm output end of the microprocessor through a photoelectric coupler; a bus interface part having a bus communication module for transmitting information of the microprocessor in the control part to a bus; the method comprises the steps of initializing the device, detecting the concentration of the combustible gas and carrying out serial communication with an upper central controller at any time. The invention realizes the networked detection of the concentration of the combustible gas, and has high measurement precision, high explosion-proof performance and large displayed information amount.
Description
Technical field
The present invention relates to a kind of gas concentration detection apparatus, specifically a kind of the realization to the concentration detection of inflammable gas and the bus type combustible gas thickness detection device and the control method thereof of alarm indication function.
Background technology
In commercial production and daily life, often use various inflammable gass, for guaranteeing the security of the lives and property, relating to the occasion of using inflammable gas, need monitor the concentration of inflammable gas usually.Need the concentration of inflammable gas be detected in real time in some important zones, monitor it and be no more than critical value, to guarantee the safety of daily productive life.
Combustible gas probe commonly used at present mainly is divided into hand-held detector, single-point type detector, multipoint mode detector.Hand-held detector is mainly used in carries out routine safety production maintenance, repair work.The single-point type detector is mainly used in the monitoring of single area, is used for family more.Multipoint mode is mainly used in the monitoring in big zone, uses in commercial production or large-area covil construction.But when the surveyed area area is very big, the multipoint mode detector is owing to all need independent wiring during to each check point installation and measuring device, the workload and the consumption of materials of installation wiring are sharply increased with the increase of check point, and debugging work is very loaded down with trivial details.
Summary of the invention
Big, the consumption of materials of installation wiring workload sharply increases and the very loaded down with trivial details deficiency of debugging work with the increase of check point when using detector for overcoming in the above-mentioned prior art, the object of the present invention is to provide a kind of accurately, safety and can realize bus type combustible gas thickness detection device and the control method thereof that networking detects.
For achieving the above object, the technical solution used in the present invention is:
Apparatus of the present invention comprise:
The gas concentration test section links to each other with the detection input end of control section, is used to detect combustable gas concentration; Control section comprises microprocessor, and the detection signal that its receiver gases concentration is divided exports display part and warning part to, has control program in the microprocessor; The display part links to each other with the demonstration output terminal of control section, shows status information, combustable gas concentration testing result and the warning message of combustable gas concentration detector; Operation part links to each other with the operation input end of control section, is used for input of control commands or detected parameters is set; The warning output has audible alarm unit, is connected to the warning output terminal of microprocessor by photoelectrical coupler; The bus interface part has bus communication module, and its information with microprocessor in the control section sends on the bus, is used for distributed connection, forms bus network; Storer links to each other with microprocessor by data line.
Described gas concentration test section comprises:
Detection probe links to each other with the constant current source that the 2nd resistance constitutes with power module; A/D converter receives the input signal of detection probe, exports the detection input end of microprocessor to; The 1st resistance is connected between the feeder ear of the 2nd resistance and detection probe, and the two ends of the 1st resistance R 01 link to each other with two input ends of A/D converter; 3rd, 4 resistance, the two series connection back is in parallel with the test side of detection probe, and the two ends of the 3rd resistance are connected to two input ends in addition of A/D converter respectively.Described display part comprises: the state display part branch is one group of light emitting diode, is connected to one group of demonstration output terminal of microprocessor by latch; The information display section branch is a display module, is connected to another demonstration output terminal of microprocessor U1, is used for the calibration information of display density testing result, warning details, detector, the set information of detecting pattern.Described warning part also comprises outside interlocking equipment, and the warning output terminal of control section is connected to the control loop of outside interlocking equipment by the relay conversion equipment.Described operation part is an input keyboard, and the key face is provided with SMD near switch, is used to select detecting pattern, sets high alarm setting lower limit, the demarcation of detection probe, the setting of real-time clock and the setting of mode bus.
Control method of the present invention may further comprise the steps:
Device is carried out initialization;
Detect combustable gas concentration;
At any time carry out serial communication with upper central controller.
Wherein said detection combustable gas concentration comprises:
Calculate the supply current ε of detection probe
1/ R
01, R wherein
01Be the 1st resistance between the feeder ear that is connected in constant current source and detection probe, ε
1Be the voltage at the 1st resistance two ends;
According to supply current and ε
2The detection resistance of change calculations detection probe change, wherein, ε
2Dividing potential drop for the detection probe test side; In tables of data, search the tested gas concentration of change in resistance correspondence;
Judge whether gas concentration transfinites;
If do not transfinite, then begin detection next time.
When judging that gas concentration transfinites, report to the police; In the time and combustable gas concentration information write-in memory of reporting to the police, start outside interlocking equipment by triggering corresponding relay conversion equipment.
Described tested gas concentration is calculated by following formula:
Wherein: R
03, R
04Be the 3rd, 4 resistance in parallel with the test side of detection probe again after the two series connection; R
a, R
bBe the resistance in the detection probe electric bridge; K is the detection probe coefficient.
Described and upper central controller carries out serial communication and may further comprise the steps:
When central controller when bus sends data, in microprocessor, trigger serial and interrupt, microprocessor enters the serial interrupt routine;
Microprocessor fetches data from its reception area register read, judges then whether the data that receive are data frame header;
For being, therewith whether station address is identical then to judge in the Frame that receives station address as above-mentioned judged result;
As above-mentioned judged result is identical, then the data that receive is carried out redundancy check, judges whether the data that receive are correct;
As above-mentioned judged result is correct, then carries out bus data order in the Frame that receives, and to central controller echo reply data, withdraws from interrupt handling routine.
The present invention has following advantage:
1. the networking that realizes combustable gas concentration detects.The present invention is distributed arrangement at the scene, is installed on different on-the-spot multiple arrangements and carries out communication by universal serial bus and central controller, installs simply, and easy to connect, cost is low, is convenient to Centralized Monitoring;
2. measuring accuracy height.The gas concentration test section adopts high-precision a/d converter to become digital signal to give microprocessor the analog signal conversion of detection probe in apparatus of the present invention and the method, draw the combustable gas concentration value through calculating or searching tables of data, the accuracy of detection height, be not subject to on-the-spot interference, testing result reliability height, good stability;
3. explosion-proof performance height.Use the noncontact keyboard during apparatus of the present invention input parameter, debugging and timing signal need not be opened the explosion-resistant enclosure of combustible gas probe at the scene, and be therefore safe, explosion-proof;
4. has outside interlock function.The present invention can be by the upper and lower bound of the self-defined combustable gas concentration warning of input keyboard, and gas concentration starts outside interlocking equipment automatically and handles on-the-spot emergency condition after surpassing high alarm setting;
5. what show contains much information, and inquiry is convenient.LED light and the combination of LCD LCDs are adopted in display part of the present invention, the gas concentration overload alarm, detecting element lost efficacy, equipment failures such as bus data check errors all can detect, obvious sound and light alarm signal is arranged, and energy real time record fault type and time of failure, be convenient to observe convenient inquiry;
6. long service life.The present invention adopts the catalytic combustion detection probe, for miscellaneous inflammable gas sharp reaction is arranged, and long service life is durable, for exceedingly odious weather and poison gas very strong tolerance is arranged.
Description of drawings
Fig. 1 is a structured flowchart of the present invention;
Fig. 2 is circuit theory diagrams of the present invention;
Fig. 3 is an embodiment synoptic diagram of apparatus of the present invention;
Fig. 4 is the inventive method synoptic diagram;
Fig. 5 detects the combustable gas concentration process flow diagram for the present invention;
Fig. 6 is apparatus of the present invention initialization flowchart;
Fig. 7 is a serial communication process flow diagram of the present invention.
Embodiment
Below in conjunction with drawings and Examples the present invention is described in further detail.
As shown in Figure 1 and Figure 2, the present invention is by forming with the lower part:
The gas concentration test section, comprise: detection probe U17, link to each other with the constant current source that the 2nd resistance R 02 constitutes with power module U12, present embodiment adopts catalytic combustion detection probe U17 and high-precision a/d converter U3, output signal is connected to control section, be used to detect combustable gas concentration, the linear variation of its resistance and gas concentration; The 1st resistance R 01 is connected between the feeder ear of the 2nd resistance R 02 and detection probe U17, and the two ends of the 1st resistance R 01 link to each other with two input ends (present embodiment is the 3rd, 4 input pin AIN3, the AIN4 of A/D converter U3) of A/D converter U3; 3rd, 4 resistance R 03, R04, the two series connection back is in parallel with the test side of detection probe U17, the two ends of the 3rd resistance R 03 are connected to two input ends (present embodiment is the 1st, 2 input pin AIN1, the AIN2 of A/D converter U3) in addition of A/D converter U3 respectively, and the output terminal of A/D converter U3 links to each other with the detection input end of the microprocessor U1 of control section.
Control section, it is core of the present invention, adopt microprocessor U1 (89c51rd2 constitutes by single-chip microcomputer), dispose house dog U6 (adopting the MAX813L chip), the stability of system is strengthened greatly, it detects input end and the operation input end links to each other with operation part with the gas concentration test section respectively, show that output terminal and warning output terminal link to each other with display part and warning output respectively, be used to import controlled variable and order, gas concentration detection, gas concentration is calculated, the control of display alarm; Also dispose storer, present embodiment adopts flash memory U8, and it links to each other with microprocessor U1 by data line, store alarms parameter and failure logging when being used for power down.
The display part comprises state display part branch and information display section branch, wherein to be divided into one group of light emitting diode be pilot lamp LED1～LED4 to state display part, be connected to one group of demonstration output terminal of microprocessor U1 by latch U9, show as state, the state of system is come into plain view, as: power supply indication, indicating fault, the indication etc. of reporting to the police.The information display section branch, be a display module U11 (present embodiment adopts the LCD LCDs), another shows output terminal to be connected to microprocessor U1, is used to show the testing result, warning details, the calibration information of gas concentration test section, the contents such as set information of detecting pattern of combustable gas concentration.
The warning output has audible alarm unit (present embodiment adopts hummer BELL), is connected to the warning output terminal of microprocessor U1 by photoelectrical coupler U18; The warning output also comprises outside interlocking equipment, and the warning output terminal of control section is connected to the control loop of outside interlocking equipment by the relay conversion equipment.In the present embodiment, outside interlocking equipment is meant vent fan, induced draft fan, fan blower, fire pump or is installed on solenoid valve in the inflammable gas pipeline etc., (present embodiment is connected to the control loop of outside interlocking equipment to the warning output terminal of control section by the 1st～4 solid-state relay U13～U16) by the relay conversion equipment, control its break-make by microprocessor U1 output signal, be used for after gas concentration transfinites, starting outside interlocking equipment.
Operation part, be input keyboard, present embodiment is the 1st～4 input keyboard KB1～KB4, the noncontact input keyboard that employing links to each other with control section operation input end, its key face is provided with SMD near switch, use ferromagnetic rod control, realize contactless keyboard input, improved security in place electricity consumption with inflammable gas.Operator selectable is selected detecting pattern, set the high alarm setting lower limit, the demarcation of detection probe, the setting of real-time clock and the functions such as setting of mode bus, wherein the 1st input keyboard KB1 is a Menu key, the 2nd input keyboard KB2 is for increasing key, and the 3rd input keyboard KB3 is for reducing key, and the 4th input keyboard KB4 is an acknowledgement key.
The bus interface part adopts the RS-485 serial bus interface, and the information of microprocessor is sent on the RS-485 universal serial bus, is used for distributed connection, forms bus network.
As shown in Figure 3, the serial communication interface of microprocessor U1 links to each other with bus communication module U4, microprocessor U1 is connected on the bus as the slave station of bus, realizes the data communication of main website (central controller), can realize that the networking of combustable gas concentration detects slave station (apparatus of the present invention).
Apparatus of the present invention are installed on device inside with detection probe, and integral installation is in an explosion-resistant enclosure, and when using at the scene, the position that only needs apparatus of the present invention scene of being fixed on will be detected gets final product.Connecting bus cable then, energized is connected in the outside contact (being the output terminal of solid-state relay) that links in the control loop of outside interlocking equipment.Install when use for the first time the back and need pass through information such as keyboard to set up bus data form, address, baud rate, get final product work behind the outside interlocking equipment of setting this locality.When operate as normal, in real time the cycle detection gas concentration is presented at testing result on the liquid crystal display, and by bus with information uploading in central controller.When gas concentration surpasses the setting boundary, detector will send the sound and light alarm signal in this locality, start outside interlocking equipment by set (can operate, menu is arranged) on display screen on keyboard, warning message is stored among the FLASHROM of apparatus of the present invention inside, and sends to central controller.A central controller can articulate a plurality of apparatus of the present invention by universal serial bus, carries out centralized management by central controller, installs simply, can realize the multiple spot monitoring, can finish detection, the warning of gas concentration in big zone.
This device can pass through the detected voltage ε of A/D converter U3
1, ε
2Judge that whether detection probe lost efficacy, and worked as ε
2Normally, ε
1When detecting positive maximum, for detection probe opens circuit, ε
1When the negative maximum value occurring, the detection probe short circuit.
The principle of work of apparatus of the present invention is as follows:
Detection probe U17 adopts the catalytic combustion detection probe, is used to detect combustable gas concentration, the linear variation of its resistance and gas concentration; Detection resistance R as detection probe U17
*When changing with gas concentration, the generation voltage difference converts digital signal to by A/D converter U3 and delivers to microprocessor U1 detection input end, realizes the detection of gas concentration; After detected combustable gas concentration transfinites, the hummer BELL sounding that is connected to the warning output of microprocessor U1 warning output terminal carries out overload alarm, be connected to microprocessor U1 and show the pilot lamp luminous warning of the state display part of output terminal in dividing, also can start outside interlocking equipment simultaneously, as fire pump, fan blowers (malleation is given the wind blower fan) etc. are in time handled the super concentration field of inflammable gas.The time of origin of the record of the parameter of alarm, warning and fault and warning (or fault) is recorded among flash memory (FLASH ROM) U8 during power down.
As shown in Figure 4, control method of the present invention is realized by the control program that is stored among the microprocessor U1, mainly may further comprise the steps: device is carried out initialization; Detect combustable gas concentration; At any time carry out serial communication with upper central controller.
Wherein detect combustable gas concentration as shown in Figure 5, be specially:
A. device powers on and carries out initialization;
B. detect the 1st resistance R
01The voltage ε at two ends (being A point and B point two ends)
1, the supply current of calculating detection probe U17 promptly flows through the 1st resistance R
01Electric current.Be specially by A/D converter U3 the 2nd passage (the difference input channel that constitutes by the 3rd, 4 input pin AIN3, AIN4) and detect the 1st resistance R
01The voltage ε at two ends
1, calculate by the 1st resistance R
01Electric current
I
01＝ε
1/R
01 (1)
C. detect the electric potential difference U2 at detection probe U17 two ends, according to supply current I
01And ε
2The detection resistance R of change calculations detection probe U17
*Change in resistance, wherein, ε
2Be the dividing potential drop of detection probe U17 test side, measure to detect by A/D converter U3 the 1st passage (the difference input channel that constitutes by the 1st, 2 pin pin AIN1, AIN2) and obtain.Be specially: the voltage of establishing detection probe U17 feeder ear (being B point and C point two ends) is ε
0, the electric current that then can flow through detection probe U17 is:
I
17＝ε
0/(R
a+R
b)+ε
0/(R
a+R
*) (2)
R wherein
a, R
bBe respectively the bridge resistor of detection probe U17.
If the voltage of detection probe U17 test side (being D point and E point two ends) is ε
3:
ε
3＝ε
0×R
a/(R
a+R
b)-ε
0×R
a/(R
a+R
*) (3)
Voltage for the 3rd resistance R 03 two ends (being F point and E point two ends) is ε 2:
ε
2＝ε
3×R
03/(R
03+R
04) (4)
Because I
01=I
17So:
ε
1/R
01＝ε
0/(R
a+R
b)+ε
0/(R
a+R
*) (5)
Draw the testing result formula by formula (3), (4), (5):
D. in tables of data, search the tested gas concentration of change in resistance correspondence: reading of data table from flash memory U8, according to detecting resistance R
*Changing value correspondence in tables of data go out gas concentration and be presented on the LCDs;
E. judge whether gas concentration transfinites: when gas concentration transfinites, activate alarm lamp, open hummer, information such as time of reporting to the police and gas concentration are write among the FLASH ROM, trigger outside interlock contact.
F. as above-mentioned judged result for not transfiniting, then begin detection next time.
G. as above-mentioned judged result when transfiniting, activate alarm lamp, open hummer BELL, in time and combustable gas concentration information write-in memory with warning, start outside interlocking equipment by triggering corresponding relay conversion equipment.
Combustable gas concentration can not tabled look-up by step e and be obtained, but according to computing formula
φ＝k×R
* (7)
Wherein: φ is tested gas concentration; K is for surveying the coefficient of probe;
The concentration that is got tested gas by formula (6), (7) is
As shown in Figure 6, the device power-up initializing is specially, initialization clock module U2 at first, from flash memory (FLASH ROM) U8, read the calibration information of this device communication information and detection probing head, LCDs reinitializes, last initialization A/D converter U3 sets its detecting pattern and ratio gain amplifier.
As shown in Figure 7, the serial communication flow process is specially:
When central controller when bus sends data, in microprocessor U1, trigger serial and interrupt, microprocessor U1 enters the serial interrupt routine;
Microprocessor U1 fetches data from its reception area register read, judges then whether the data that receive are data frame header;
For being, therewith whether station address is identical then to judge in the Frame that receives station address as above-mentioned judged result;
As above-mentioned judged result is identical, then the data that receive is carried out redundancy check, judges whether the data that receive are correct;
For correctly being, then carry out bus data order in the Frame that receives as above-mentioned judged result,, withdraw from interrupt handling routine to central controller echo reply data.
Claims (10)
1. bus type combustible gas thickness detection device is characterized in that comprising:
The gas concentration test section links to each other with the detection input end of control section, is used to detect combustable gas concentration;
Control section comprises microprocessor (U1), and the detection signal that its receiver gases concentration is divided exports display part and warning part to, has control program in the microprocessor (U1);
The display part links to each other with the demonstration output terminal of control section, shows status information, combustable gas concentration testing result and the warning message of combustable gas concentration detector;
Operation part links to each other with the operation input end of control section, is used for input of control commands or detected parameters is set;
The warning output has audible alarm unit, is connected to the warning output terminal of microprocessor (U1) by photoelectrical coupler (U18);
The bus interface part has bus communication module (U4), and its information with microprocessor in the control section (U1) sends on the bus, is used for distributed connection, forms bus network;
Storer links to each other with microprocessor (U1) by data line.
2. by the described combustable gas concentration detector of claim 1, it is characterized in that described gas concentration test section comprises:
Detection probe (U17) links to each other with the constant current source that the 2nd resistance (R02) constitutes with power module (U12);
A/D converter (U3) receives the input signal of detection probe (U17), exports the detection input end of microprocessor (U1) to;
The 1st resistance (R01) is connected between the feeder ear of the 2nd resistance (R02) and detection probe (U17), and the two ends of the 1st resistance R 01 link to each other with two input ends of A/D converter (U3);
3rd, 4 resistance (R03, R04), the two series connection back is in parallel with the test side of detection probe (U17), and the two ends of the 3rd resistance (R03) are connected to two input ends in addition of A/D converter (U3) respectively.
3. by the described combustable gas concentration detector of claim 1, it is characterized in that described display part comprises:
The state display part branch is one group of light emitting diode, is connected to one group of demonstration output terminal of microprocessor (U1) by latch (U9);
The information display section branch is a display module (U11), is connected to another demonstration output terminal of microprocessor (U1), is used for the calibration information of display density testing result, warning details, detector, the set information of detecting pattern.
4. by the described combustable gas concentration detector of claim 1, it is characterized in that: described warning part also comprises outside interlocking equipment, and the warning output terminal of control section is connected to the control loop of outside interlocking equipment by the relay conversion equipment.
5. by the described combustable gas concentration detector of claim 1, it is characterized in that: described operation part is an input keyboard, and the key face is provided with SMD near switch, be used to select detecting pattern, set high alarm setting lower limit, the demarcation of detection probe, the setting of real-time clock and the setting of mode bus.
6. the control method of a combustable gas concentration detector is characterized in that may further comprise the steps:
Device is carried out initialization;
Detect combustable gas concentration;
At any time carry out serial communication with upper central controller.
7. by the control method of the described combustable gas concentration detector of claim 6, it is characterized in that detecting combustable gas concentration and comprise:
Calculate the supply current ε of detection probe (U17)
1/ R
01, R wherein
01Be the 1st resistance between the feeder ear that is connected in constant current source and detection probe (U17), ε
1Be the 1st resistance (R
01) voltage at two ends;
According to supply current and ε
2The detection resistance (R of change calculations detection probe (U17)
*) change in resistance, wherein, ε
2Dividing potential drop for detection probe (U17) test side; In tables of data, search the tested gas concentration of change in resistance correspondence;
Judge whether gas concentration transfinites;
If do not transfinite, then begin detection next time.
8. by the control method of the described combustable gas concentration detector of claim 7, it is characterized in that further comprising the steps of: when judging that gas concentration transfinites, report to the police; In the time and combustable gas concentration information write-in memory of reporting to the police, start outside interlocking equipment by triggering corresponding relay conversion equipment.
9. by the control method of the described combustable gas concentration detector of claim 7, it is characterized in that: described tested gas concentration is calculated by following formula:
Wherein: R
03, R
04Be the 3rd, 4 resistance in parallel with the test side of detection probe (U17) again after the two series connection; R
a, R
bBe the resistance in detection probe (U17) electric bridge; K is the detection probe coefficient.
10. by the control method of the described combustable gas concentration detector of claim 7, it is characterized in that described and upper central controller carries out serial communication and may further comprise the steps:
When central controller when bus sends data, in microprocessor (U1), trigger the serial interruption, microprocessor (U1) enters the serial interrupt routine;
Microprocessor (U1) fetches data from its reception area register read, judges then whether the data that receive are data frame header;
For being, therewith whether station address is identical then to judge in the Frame that receives station address as above-mentioned judged result;
As above-mentioned judged result is identical, then the data that receive is carried out redundancy check, judges whether the data that receive are correct;
As above-mentioned judged result is correct, then carries out bus data order in the Frame that receives, and to central controller echo reply data, withdraws from interrupt handling routine.
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Cited By (5)
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| CN102507847A (en) * | 2011-10-10 | 2012-06-20 | 李敏 | Full-intelligent voice digital independent combustible gas detector |
| CN103578232A (en) * | 2013-11-01 | 2014-02-12 | 上海翼捷工业安全设备股份有限公司 | Bus type gas monitoring and alarming control system and method |
| CN110426978A (en) * | 2019-08-12 | 2019-11-08 | 深圳市泛海三江电子股份有限公司 | Bus type combustible gas detection control circuit, method and device |
| CN110726806A (en) * | 2019-09-29 | 2020-01-24 | 广东聚源管业实业有限公司 | Pipeline detection method under gas sensor detection device |
| WO2021027877A1 (en) * | 2019-08-15 | 2021-02-18 | 深圳市德塔防爆电动汽车有限公司 | Three-in-one sensor gas concentration measurement method and three-in-one sensor |
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| CN2243080Y (en) * | 1995-08-22 | 1996-12-18 | 上海尼赛拉传感器有限公司 | Carbon monoxide detecting alarm |
| CN2394221Y (en) * | 1999-06-01 | 2000-08-30 | 卞广清 | Portable intellectual and multifunctional methane detecting alarm instrument |
| CN1174229C (en) * | 2002-01-24 | 2004-11-03 | 天津大学 | In-line detection system for pipe burst failure in water supply pipeline network in urban area |
| CN1244812C (en) * | 2002-04-10 | 2006-03-08 | 陈利平 | Portable combined intelligent gas detecting and alarming instrument and its detecting method |
| US6954702B2 (en) * | 2003-02-21 | 2005-10-11 | Ric Investments, Inc. | Gas monitoring system and sidestream gas measurement system adapted to communicate with a mainstream gas measurement system |
| CN1598591A (en) * | 2004-07-19 | 2005-03-23 | 重庆大学 | Multi-targent air monitoring and sampling remote radio monitoring system |
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2006
- 2006-12-27 CN CN2006101351123A patent/CN101210931B/en not_active Expired - Fee Related
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| CN102507847A (en) * | 2011-10-10 | 2012-06-20 | 李敏 | Full-intelligent voice digital independent combustible gas detector |
| CN103578232A (en) * | 2013-11-01 | 2014-02-12 | 上海翼捷工业安全设备股份有限公司 | Bus type gas monitoring and alarming control system and method |
| CN103578232B (en) * | 2013-11-01 | 2016-09-07 | 上海翼捷工业安全设备股份有限公司 | Bus-type gas-monitoring and alarm control system and method |
| CN110426978A (en) * | 2019-08-12 | 2019-11-08 | 深圳市泛海三江电子股份有限公司 | Bus type combustible gas detection control circuit, method and device |
| CN110426978B (en) * | 2019-08-12 | 2024-04-02 | 深圳市高新投三江电子股份有限公司 | Bus type combustible gas detection control circuit, method and device thereof |
| WO2021027877A1 (en) * | 2019-08-15 | 2021-02-18 | 深圳市德塔防爆电动汽车有限公司 | Three-in-one sensor gas concentration measurement method and three-in-one sensor |
| CN110726806A (en) * | 2019-09-29 | 2020-01-24 | 广东聚源管业实业有限公司 | Pipeline detection method under gas sensor detection device |
| CN110726806B (en) * | 2019-09-29 | 2022-06-14 | 广东聚源管业实业有限公司 | Pipeline detection method under gas sensor detection device |
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