CN201628706U - Four-gas detection device based on wireless fidelity - Google Patents
Four-gas detection device based on wireless fidelity Download PDFInfo
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- CN201628706U CN201628706U CN2010201035700U CN201020103570U CN201628706U CN 201628706 U CN201628706 U CN 201628706U CN 2010201035700 U CN2010201035700 U CN 2010201035700U CN 201020103570 U CN201020103570 U CN 201020103570U CN 201628706 U CN201628706 U CN 201628706U
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Abstract
The utility model discloses a four-gas detection device based on wireless fidelity, which is characterized in that the four-gas detection device comprises a controller, a radio transmission unit, a serial port unit, a digital display unit, a power supply unit, a gas sensor unit and a concentration limit alarm unit, wherein the gas sensor unit consists of a carbon monioxide sensor, a hydrogen sulfide sensor, a methane sensor, an oxygen sensor, a first conditioning circuit, a second conditioning circuit, a third conditioning circuit, a fourth conditioning circuit and a time division multiplex one-out-of-four electric analog switch. Besides, a rechargeable battery pack is arranged in the four-gas detection device, the four-gas detection device can be carried by an operator or hung on a working area, and four gas concentrations acquired in environments can be displayed digitally by means of triggering of local keys and can be transmitted to a dispatching room wirelessly, thereby increasing response speed of mines in abnormal situation or accidents, simultaneously avoiding laying of communication cables and saving coal mine production cost greatly.
Description
Technical field
The utility model relates to a kind of gas detecting system, relates in particular to a kind of four gas-detecting devices based on Wireless Fidelity.
Background technology
WI-FI Wireless Fidelity (full name Wireless Fidelity), the IEEE802.11b specifications for wireless networks is the mutation of IEEE802.11 standard, high bandwidth is 11Mbps, under the more weak or noisy situation of signal, bandwidth can be adjusted to 5.5Mbps, 2Mbps and 1Mbps, the automatic adjustment of bandwidth has ensured stability of network and reliability effectively.Its key property is: speed is fast, the reliability height, and in open zone, communication distance can reach 305 meters, and in the closure zone, communication distance is 76 meters to 122 meters, and convenient and existing wired ethernet network is integrated, and the cost of networking is lower.
The topmost advantage of WI-FI do not need to be wiring, can not be subjected to the restriction of wiring condition, therefore be fit to very much be applied in mobile occasion, has vast market prospect, it is from traditional health care at present, special industries such as stock control and management service are opened to conglomerate expansion more, under the complete situation of networking, 802.11b real work distance can reach more than 100 meters, and solved the error correction problem of high-speed mobile data, error code problem, WIFI equipment and equipment, switching between equipment and the base station and safety certification have all obtained good solution.
At present, mining gas-detecting device mostly is and adopts handheld instrument or Fieldbus Based gas-detecting device.The use of handheld instrument (minority staffing) makes aboveground dispatcher can't control the gas concentration of workman perform region in real time, can't in time notify the related personnel to withdraw to the harmful gas zone of transfiniting; Exist removable poor, down-hole to lay the cable difficulty based on the gas-detecting device of field bus technique, pull apart etc. all multifactor easily.Native system adopts four gas-detecting devices based on the WI-FI technology, can detect CO, H simultaneously
2S, CH
4, O
2Four kinds of gases are incorporated the environmental gas parameter that collects into existing Industrial Ethernet by wireless mode.No matter from real-time, the mobility aspect all has self good advantages.
The utility model content
The utility model purpose is to provide a kind of four gas-detecting devices based on Wireless Fidelity at the defective that prior art exists.
The utility model adopts following technical scheme for achieving the above object:
A kind of four gas-detecting devices of the utility model based on Wireless Fidelity, this device comprises controller, wireless transmitting unit, serial ports unit, digital display unit, power supply power supply unit, gas sensor unit and concentration overload alarm unit, and wherein gas sensor unit selects a simulant electronic switch to constitute by carbon monoxide transducer, hydrogen sulfide sensor, methane transducer, oxygen sensor, first to fourth modulate circuit and time division multiplex four; Carbon monoxide transducer connects the input end that time division multiplex four is selected a simulant electronic switch after being connected in series first modulate circuit, hydrogen sulfide sensor connects the input end that time division multiplex four is selected a simulant electronic switch after being connected in series second modulate circuit, methane transducer connects the input end that time division multiplex four is selected a simulant electronic switch after being connected in series the 3rd modulate circuit, oxygen sensor connects the input end that time division multiplex four is selected a simulant electronic switch after being connected in series the 4th modulate circuit, controller selects with serial ports unit and time division multiplex four respectively that a simulant electronic switch is two-way to be connected, the output terminal of controller connects wireless transmitting unit respectively, the input end of digital display unit and concentration overload alarm unit, the power supply power supply unit is powered to controller.
The utility model is owing to adopted such scheme, the environmental gas concentration value at first is converted into analog electrical signal through gas sensor, then after the signal conditioning circuit filter amplifying processing, select a simulant electronic switch that four road concentration value timesharing are sent to the ADC pin of GS1010 controller through time-sharing multiplex four, the APP_CPU of GS1010 packs the data to the data wireless that meets the IEEE802.11 agreement by WLAN_CPU afterwards with the packing data that collects and sends; The access point (Access Point) that meets the IEEE802.11b/g agreement at receiving end receives the data that wireless carrier sends over, and gives host computer by the RJ45 interface, and the data that host computer is come to reception unpack demonstration; This gas-detecting device is an outstation, and the access point owing to based on WI-FI (IEEE802.11/g agreement) can insert a plurality of outstations simultaneously, so this system can continue expansion, has reached the purpose of utility model.
Advantage: at present, mining gas-detecting device mostly is and adopts handheld instrument or Fieldbus Based gas-detecting device.The use of handheld instrument (minority staffing) makes aboveground dispatcher can't control the gas concentration of workman perform region in real time, can't in time notify the related personnel to withdraw to the harmful gas zone of transfiniting; Exist removable poor, down-hole to lay the cable difficulty based on the gas-detecting device of field bus technique, pull apart etc. all multifactor easily.Native system adopts four gas-detecting devices based on the WI-FI technology, can detect CO, H simultaneously
2S, CH
4, O
2Four kinds of gases are incorporated the environmental gas parameter that collects into existing Industrial Ethernet by wireless mode.No matter from real-time, the mobility aspect all has self good advantages.
Description of drawings
Fig. 1 is of the present utility model based on WI-FI four gas system block diagram.
Fig. 2 is GS1010 controller circuitry figure of the present utility model.
Fig. 3 is a wireless transmitting unit circuit diagram of the present utility model.
Fig. 4 is serial ports element circuit figure of the present utility model.
Fig. 5 is digital display unit circuit figure of the present utility model.
Fig. 6 is a power supply power supply unit circuit diagram of the present utility model.
Fig. 7 is a gas sensor unit circuit diagram of the present utility model.
Embodiment
Be elaborated below in conjunction with the technical scheme of accompanying drawing to utility model:
As shown in Figure 1, a kind of four gas-detecting devices of the utility model based on Wireless Fidelity, this device comprises controller, wireless transmitting unit, serial ports unit, digital display unit, power supply power supply unit, gas sensor unit and concentration overload alarm unit, and wherein gas sensor unit selects a simulant electronic switch to constitute by carbon monoxide transducer, hydrogen sulfide sensor, methane transducer, oxygen sensor, first to fourth modulate circuit and time division multiplex four; Carbon monoxide transducer connects the input end that time division multiplex four is selected a simulant electronic switch after being connected in series first modulate circuit, hydrogen sulfide sensor connects the input end that time division multiplex four is selected a simulant electronic switch after being connected in series second modulate circuit, methane transducer connects the input end that time division multiplex four is selected a simulant electronic switch after being connected in series the 3rd modulate circuit, oxygen sensor connects the input end that time division multiplex four is selected a simulant electronic switch after being connected in series the 4th modulate circuit, controller selects with serial ports unit and time division multiplex four respectively that a simulant electronic switch is two-way to be connected, the output terminal of controller connects wireless transmitting unit respectively, the input end of digital display unit and concentration overload alarm unit, the power supply power supply unit is powered to controller.
Described controller includes: single-chip microcomputer, low frequency crystal oscillator, high frequency crystal oscillator and capacitance network, and an end ground connection of capacitance network wherein, the capacitance network other end is connected with single-chip microcomputer, and the output terminal of low frequency crystal oscillator, high frequency crystal oscillator connects the input end of single-chip microcomputer respectively.
Described wireless transmitting unit is made of bandpass filter serial connection antenna.
Described bandpass filter is that DEA252450-7012D1 bandpass filter chip constitutes by model.
As shown in Figure 2, controller described in the utility model adopts the GS1010 controller, described GS1010 controller includes: single-chip microcomputer (GS1010) and capacitance network, one end ground connection of capacitance network, the capacitance network other end is connected with the GS1010 controller, the A15 of single-chip microcomputer, A16, B4, B5, B6, B7, B8, B9, B11 goes to be connected with the L4 of power supply power supply unit, A2, A8, A9, A43, A48, A50, B16, B17, B19, B20, B22, B23, B25, B26, B28, B29 goes to be connected with the L2 of power supply power supply unit, B1, A21, B2, B3, A24 goes to be connected with the L3 of power supply power supply unit, A35 goes to be connected with 4 pin of power supply power supply unit U7, A38 goes to be connected with the L5 of power supply power supply unit, A41 ground connection, A13,14 remove 5 pin with wireless transmitting unit U2 respectively, 7 pin connect, A1, A3, A44, A47, A9, A52 is connected with pilot lamp, A25, A26 is connected with 4 pin with 1 pin of crystal oscillator Y1 respectively, A31 goes to be connected with 3 pin of digital display unit U4, A33, A34 is connected with crystal oscillator Y2 two pins respectively, A36 is by resistance R 20 ground connection, A37 goes to be connected with 8 pin of gas sensor unit U12, A42 had not only gone to be connected with A12 but also to be connected with 2 pin of U6 by resistance R 21, A56 goes to be connected with 4 pin of digital display unit U3, A57, A60, A61 removes 27 pin with digital display unit U16 respectively, 25 pin, 26 pin connect, B18 goes to be connected with 4 pin of digital display unit C6, A51, A59 goes respectively to be connected with 10 pin with 1 pin of gas sensor unit U12, A70 goes to be connected with 3 pin of serial ports unit U5, B30 goes to be connected with 2 pin of serial ports unit P1, A71 goes to be connected with 4 pin of serial ports U1, A72 goes to be connected with 6 pin of serial ports P1, B14 is by R15 ground connection, R14 one end goes to be connected with 2 pin of power supply power supply JP1 by the R15 ground connection other end, the 1 pin ground connection of U6,3 pin of U6 go to be connected with 2 pin of power supply power supply unit JP1.
Gas sensor is gathered environmental gas concentration, amplify by signal conditioning circuit, carry out four then and select one to send four kinds of gas timesharing the AD translation interface of controlled in wireless chip GS1010 to, the APP_CPU of GS1010 sends packing the data to the data wireless that meets the IEEE802.11 agreement by WLAN_CPU after the packing data that collects; The access point (Access Point) that meets the IEEE802.11b/g agreement at receiving end receives the data that wireless carrier sends over, and gives host computer by the RJ45 interface, and the data that host computer is come to reception unpack demonstration.
As shown in Figure 3, described wireless transmitting unit includes: bandpass filter chip (DEA252450-7012D1) and high frequency antenna interface (SMA_CONN), 5 pin of bandpass filter chip, 7 pin go respectively to be connected with A14, the A13 of single-chip microcomputer, 3 pin go to be connected with the L4 of power supply power supply unit, 4 pin, 8 pin ground connection, 2 pin of high frequency antenna interface, 3 pin, 4 pin, 5 pin ground connection.
As shown in Figure 4, described serial ports unit pack vinculum road driver element, dual power supply converting unit and 6 needle serial ports, wherein the circuit driver element is connected with controller, dual power supply converting unit and 6 needle serial ports respectively, the dual power supply converting unit is connected with 6 needle serial ports with controller respectively, and 6 needle serial ports are connected with controller.Line driver (74LVC1G125), dual power supply converter (74LVC1T45), 6 needle serial ports, 4 pin of line driver go to be connected with the A71 of single-chip microcomputer, 5 pin go to be connected with the B28 pin of single-chip microcomputer, 1 pin, 3 pin ground connection, 3 pin of dual power supply converter go to be connected with the A70 of single-chip microcomputer, and 1 pin goes to be connected with the A71 of single-chip microcomputer, 2 pin ground connection, 1 pin ground connection of 6 needle serial ports, 2 pin go to be connected with the B30 of single-chip microcomputer, and 6 pin go to be connected with the A27 of single-chip microcomputer.
As shown in Figure 5, described digital display unit includes: digital display control chip (CH451), and electronic switch (MAX4715), line driver (74LVC125), button remove to tremble device (MAX6816).5 pin of digital display control chip are connected with 8 pin of DS1,6 pin of digital display control chip are connected with 8 pin of DS2,7 pin of digital display control chip are connected with 8 pin of DS3,9 pin of digital display control chip are connected with 8 pin of DS4,9 pin ground connection, 23 pin are connected with 1 pin of C6,25 pin go to be connected with the A60 of single-chip microcomputer, 26 pin go to be connected with the A61 of single-chip microcomputer, 27 pin go to be connected with the A57 of single-chip microcomputer, 15 pin are by resistance R 12 and DS1, DS2, DS3,7 pin of DS4 connect, 16 pin are by resistance R 11 and DS1, DS2, DS3,6 pin of DS4 connect, 17 pin are by resistance R 10 and DS1, DS2, DS3,4 pin of DS4 connect, 18 pin are by resistance R 9 and DS1, DS2, DS3,2 pin of DS4 connect, 19 pin are by resistance R 8 and DS1, DS2, DS3,1 pin of DS4 connects, 20 pin are by resistance R 7 and DS1, DS2, DS3,9 pin of DS4 connect, 21 pin are by resistance R 6 and DS1, DS2, DS3,10 pin of DS4 connect, 22 pin are by resistance R 5 and DS1, DS2, DS3,5 pin of DS4 connect, 1 pin of electronic switch is connected with 23 pin of digital display control chip, 2 pin go to be connected with 5 pin of the U8 of power supply power supply unit, 3 pin ground connection, 4 pin go to be connected with the B18 of single-chip microcomputer, 1 pin of line driver, the equal ground connection of 3 pin, 2 pin go to be connected with the A31 of single-chip microcomputer, 4 pin go to be connected with the A56 of single-chip microcomputer, button goes to tremble 1 pin ground connection of device, 2 pin are by switch ground connection, and 3 pin go to be connected with the A31 of single-chip microcomputer, and 4 pin go to be connected with 2 pin of power supply power supply unit JP1.
As shown in Figure 6, described power supply power supply unit comprises three level conversion units and battery management unit, wherein battery management unit is connected with second level conversion unit with digital display unit respectively, second level conversion unit, the 3rd level conversion unit are connected with gas sensor unit respectively, and first level conversion unit is connected with controller.Level transferring chip (TPS62261, MAX828, TPS76130), battery management chip (FDN304PZ), 2 pin of battery management chip go to be connected with 4 pin of digital display unit U4, degas 7 pin of each amplifier of body sensor unit of 5 pin of level transferring chip (TPS76130) connect, level transferring chip (MAX828) 1 pin goes to be connected with 4 pin of each amplifier of gas sensor unit, level transferring chip (TPS62261) 4 pin go to be connected with the A35 of single-chip microcomputer, level transferring chip (TPS62261) 5 pin are connected with 2 pin of JP1,3 pin of level transferring chip U1 remove the A2 with single-chip microcomputer, A8, A9, A43, A48, A50, B16, B17, B19, B20, B22, B23, B25, B26, B28, B29 connects, VDD_PLL removes the B1 with single-chip microcomputer, A21, B2, B3, A24 connects, VDD_RF_1V8 removes the A15 with single-chip microcomputer, A16, B4, B5, B6, B7, B8, B9, B11 connects, and VDD_ADC goes to be connected with the A38 of single-chip microcomputer
As shown in Figure 7, described gas sensor unit includes: oxygen sensor (O2_SENSOR), methane transducer (CH4_SENSRO), carbon monoxide and sulfuretted hydrogen one body sensor (CO_H2S), operational amplifier (OP90, AD620), time division multiplex four is selected a simulant electronic switch (MAX4734), 1 pin of simulant electronic switch, 10 pin remove the A51 with single-chip microcomputer respectively, A59 connects, 8 pin go to be connected with the A37 of single-chip microcomputer, 2 pin are by capacitor C 45 ground connection, 9 pin are by capacitor C 43 ground connection, 4 pin are connected with 6 pin of U12,7 pin are by capacitor C 40 ground connection, 5 pin, 6 pin go to be connected with 5 pin of power supply power supply unit U8,3 pin ground connection, 7 pin of amplifier go to be connected with 5 pin of power supply power supply unit U8, and 4 pin go to be connected with 1 pin of power supply power supply unit U9.
In Fig. 1, gas sensor (oxygen sensor, methane transducer, carbon monoxide transducer, hydrogen sulfide sensor) is gathered environmental gas concentration, amplify by signal conditioning circuit, carry out time-sharing multiplex four then and select a multi-channel analog electronic switch (MAX4734) to send four kinds of gas timesharing the AD translation interface of controlled in wireless chip GS1010 to, the APP_CPU of GS1010 sends packing the data to the data wireless that meets the IEEE802.11 agreement by WLAN_CPU after the packing data that collects; The access point (Access Point) that meets the IEEE802.11b/g agreement at receiving end receives the data that wireless carrier sends over, and gives host computer by the RJ45 interface, and the data that host computer is come to reception unpack demonstration.
At Fig. 2, in 3,4,5,6,7, this circuit theory is made up of six parts, and the connection of each several part circuit is marked by the network label.Gas sensor unit: detected CO, H2S, O2, CH4 concentration are converted into electric signal, and this signal is amplified by signal conditioning circuit filtering; Wireless transmitting unit: HFS is by bandpass filter DEA252450BT-7012D1, and the 2.4GHz antennal interface constitutes; The serial ports unit: serial ports unit by using line driver 74LVC1G125, dual power supply converter 74LVC1T45 mainly realizes the serial ports voltage transitions; Digital display unit: major function is the concentration of four kinds of gases of local circulation, mainly by charactron chip for driving CH451, button remove to tremble chip MAX6816, circuit chip for driving 74LVC1G125 constitutes; The power supply power supply unit: utilize level transferring chip TPS62261 that 1.8V is provided voltage, level transferring chip TPS76130 provides 3.0V voltage, and level transferring chip MAX828 provides-3V voltage; The GS1010 control module: this unit is mainly finished the AD sampling of gas concentration electric signal, the local digital control that shows, packing data, the modulation of transmission data wireless and is received data demodulates.
Claims (7)
1. four gas-detecting devices based on Wireless Fidelity, it is characterized in that: this device comprises controller, wireless transmitting unit, serial ports unit, digital display unit, power supply power supply unit, gas sensor unit and concentration overload alarm unit, and wherein gas sensor unit selects a simulant electronic switch to constitute by carbon monoxide transducer, hydrogen sulfide sensor, methane transducer, oxygen sensor, first to fourth modulate circuit and time division multiplex four; Carbon monoxide transducer connects the input end that time division multiplex four is selected a simulant electronic switch after being connected in series first modulate circuit, hydrogen sulfide sensor connects the input end that time division multiplex four is selected a simulant electronic switch after being connected in series second modulate circuit, methane transducer connects the input end that time division multiplex four is selected a simulant electronic switch after being connected in series the 3rd modulate circuit, oxygen sensor connects the input end that time division multiplex four is selected a simulant electronic switch after being connected in series the 4th modulate circuit, controller selects with serial ports unit and time division multiplex four respectively that a simulant electronic switch is two-way to be connected, the output terminal of controller connects wireless transmitting unit respectively, the input end of digital display unit and concentration overload alarm unit, the power supply power supply unit is powered to controller.
2. a kind of four gas-detecting devices according to claim 1 based on Wireless Fidelity, it is characterized in that: described controller includes: single-chip microcomputer, low frequency crystal oscillator, high frequency crystal oscillator and capacitance network, an end ground connection of capacitance network wherein, the capacitance network other end is connected with single-chip microcomputer, and the output terminal of low frequency crystal oscillator, high frequency crystal oscillator connects the input end of single-chip microcomputer respectively.
3. a kind of four gas-detecting devices based on Wireless Fidelity according to claim 1 is characterized in that: described wireless transmitting unit is made of bandpass filter serial connection antenna.
4. a kind of four gas-detecting devices based on Wireless Fidelity according to claim 3 is characterized in that: described bandpass filter is that DEA252450-7012D1 bandpass filter chip constitutes by model.
5. a kind of four gas-detecting devices according to claim 1 based on Wireless Fidelity, it is characterized in that: described serial ports unit pack vinculum road driver element, dual power supply converting unit and 6 needle serial ports, wherein the circuit driver element is connected with controller, dual power supply converting unit and 6 needle serial ports respectively, the dual power supply converting unit is connected with 6 needle serial ports with controller respectively, and 6 needle serial ports are connected with controller.
6. a kind of four gas-detecting devices according to claim 2 based on Wireless Fidelity, it is characterized in that: described digital display unit comprises four charactron DS1 ~ DS4, eight resistance R 5 ~ R12, digital display control chip, electronic switch, line driver and button remove to tremble device, wherein 5 pin of digital display control chip are connected with 8 pin of charactron DS1,6 pin are connected with 8 pin of charactron DS2,7 pin are connected with 8 pin of charactron DS3,9 pin are connected with 8 pin of charactron DS4,9 pin ground connection, 23 pin of digital display control chip are connected with 1 pin of C6,25 pin, 26 pin, 27 pin are connected with controller respectively, 15 pin are by resistance R 12 and charactron DS1, DS2, DS3,7 pin of DS4 connect, 16 pin are by resistance R 11 and charactron DS1, DS2, DS3,6 pin of DS4 connect, 17 pin are by resistance R 10 and charactron DS1, DS2, DS3,4 pin of DS4 connect, 18 pin are by resistance R 9 and charactron DS1, DS2, DS3,2 pin of DS4 connect, 19 pin are by resistance R 8 and charactron DS1, DS2, DS3,1 pin of DS4 connects, 20 pin are by resistance R 7 and charactron DS1, DS2, DS3,9 pin of DS4 connect, 21 pin are by resistance R 6 and charactron DS1, DS2, DS3,10 pin of DS4 connect, and 22 pin are by resistance R 5 and charactron DS1, DS2, DS3,5 pin of DS4 connect;
1 pin of electronic switch is connected with 23 pin of digital display control chip, and 2 pin are connected with the power supply power supply unit, 3 pin ground connection, and 4 pin are connected with controller;
1 pin of line driver, the equal ground connection of 3 pin, 2 pin, 4 pin are connected with controller respectively;
Button goes to tremble 1 pin ground connection of device, and 2 pin are by switch S 1 ground connection, and 3 pin are connected with controller, and 4 pin go the power supply power supply unit to connect.
7. a kind of four gas-detecting devices according to claim 2 based on Wireless Fidelity, it is characterized in that: described power supply power supply unit comprises three level conversion units and battery management unit, wherein battery management unit is connected with second level conversion unit with digital display unit respectively, second level conversion unit, the 3rd level conversion unit are connected with gas sensor unit respectively, and first level conversion unit is connected with controller.
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| CN2010201035700U CN201628706U (en) | 2010-01-28 | 2010-01-28 | Four-gas detection device based on wireless fidelity |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102495184A (en) * | 2011-12-20 | 2012-06-13 | 上海西派埃自动化技术工程有限公司 | Wireless detection method for hydrogen sulfide in sewage treatment process |
| CN102525281A (en) * | 2011-12-21 | 2012-07-04 | 西北工业大学 | Water dispenser capable of detecting combustible gas |
| CN102636622A (en) * | 2012-04-25 | 2012-08-15 | 山西埃尔气体系统工程有限公司 | Wide-area oxygen concentration measurement method and realization device intelligent wide-area oxygen measurement instrument thereof |
| CN103019173A (en) * | 2012-11-09 | 2013-04-03 | 河南宝龙电子科技有限公司 | Integrated monitoring system of domestic indoor gas by utilizing 3G technology |
| CN103091455A (en) * | 2011-11-04 | 2013-05-08 | 北京凌天世纪自动化技术有限公司 | Wireless detection ball for investigation in dangerous zone |
| CN103675202A (en) * | 2013-11-21 | 2014-03-26 | 哈尔滨东方报警设备开发有限公司 | Battery-free air quality detector based on NFC (near field communication) |
| GB2519857A (en) * | 2013-10-07 | 2015-05-06 | Strata Products Worldwide Llc | Gas monitor, system and method |
| GB2548144A (en) * | 2016-03-10 | 2017-09-13 | Lasermet Ltd | Two-channel communication systems |
| US10089848B2 (en) | 2013-06-07 | 2018-10-02 | Strata Products Worldwide, Llc | Gas monitor, system and method sensing two different gases |
| CN108825307A (en) * | 2018-07-10 | 2018-11-16 | 贵州大学 | Monitoring system is used in a kind of protection of safety of coal mines |
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2010
- 2010-01-28 CN CN2010201035700U patent/CN201628706U/en not_active Expired - Lifetime
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103091455A (en) * | 2011-11-04 | 2013-05-08 | 北京凌天世纪自动化技术有限公司 | Wireless detection ball for investigation in dangerous zone |
| CN102495184A (en) * | 2011-12-20 | 2012-06-13 | 上海西派埃自动化技术工程有限公司 | Wireless detection method for hydrogen sulfide in sewage treatment process |
| CN102525281A (en) * | 2011-12-21 | 2012-07-04 | 西北工业大学 | Water dispenser capable of detecting combustible gas |
| CN102636622A (en) * | 2012-04-25 | 2012-08-15 | 山西埃尔气体系统工程有限公司 | Wide-area oxygen concentration measurement method and realization device intelligent wide-area oxygen measurement instrument thereof |
| CN102636622B (en) * | 2012-04-25 | 2014-10-15 | 山西埃尔气体系统工程有限公司 | Wide-area oxygen concentration measurement method and realization device intelligent wide-area oxygen measurement instrument thereof |
| CN103019173A (en) * | 2012-11-09 | 2013-04-03 | 河南宝龙电子科技有限公司 | Integrated monitoring system of domestic indoor gas by utilizing 3G technology |
| US10089848B2 (en) | 2013-06-07 | 2018-10-02 | Strata Products Worldwide, Llc | Gas monitor, system and method sensing two different gases |
| GB2519857A (en) * | 2013-10-07 | 2015-05-06 | Strata Products Worldwide Llc | Gas monitor, system and method |
| CN103675202A (en) * | 2013-11-21 | 2014-03-26 | 哈尔滨东方报警设备开发有限公司 | Battery-free air quality detector based on NFC (near field communication) |
| GB2548144A (en) * | 2016-03-10 | 2017-09-13 | Lasermet Ltd | Two-channel communication systems |
| GB2548144B (en) * | 2016-03-10 | 2021-04-28 | Lasermet Ltd | Two-channel communication systems |
| CN108825307A (en) * | 2018-07-10 | 2018-11-16 | 贵州大学 | Monitoring system is used in a kind of protection of safety of coal mines |
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