CN201705394U - Miniature methane-oxygen diction and alarm instrument for mine - Google Patents
Miniature methane-oxygen diction and alarm instrument for mine Download PDFInfo
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- CN201705394U CN201705394U CN2010202432100U CN201020243210U CN201705394U CN 201705394 U CN201705394 U CN 201705394U CN 2010202432100 U CN2010202432100 U CN 2010202432100U CN 201020243210 U CN201020243210 U CN 201020243210U CN 201705394 U CN201705394 U CN 201705394U
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Abstract
The utility model discloses a miniature methane-oxygen diction and alarm instrument for a mine, which belongs to an underground gas detection and alarm instrument for the mine and comprises a power supply, a microprocessor, a methane detector, an oxygen detector, a controller, a display device and an audible and visual alarm, wherein the power supply is connected with the microprocessor, the methane detector, the oxygen detector, the controller, the display device and the audible and visual alarm; and the methane detector, the oxygen detector, the controller, the display device and the audible and visual alarm are respectively connected with the microprocessor. The methane-oxygen diction and alarm instrument has the advantages that a low-power multifunctional embedded microprocessor is used to form a hardware circuit; by optimizing and simplifying the circuit design and matching application software program, the instrument has optimized structure, extra-small size, complete function and convenient use; the instrument is provided with a low-voltage indication for automatically shutting down under the undervoltage condition, a high-gas protective circuit and the like, thereby prolonging the service life of the instrument; and by adopting a full-surface mounted technology, the instrument has reasonable structure, extra-small size and convenient carrying.
Description
Technical field
The utility model relates to gas detecting and alarming instrument under a kind of coal mine, particularly a kind of miniature colliery methane oxygen detection alarm.
Background technology
At present, under coal mine,,, will blast when methane concentration transfinites because environment has methane gas to generate naturally, during the oxygen concentration lower bound, entail dangers to people's life security.People use the dual-purpose detection alarm instrument of a kind of portable methane-oxygen, this alarm can detect methane under the coal mine, oxygen gas concentration, and transfinite when methane concentration, during the oxygen concentration lower bound, automatically send the sound and light alarm signal, remind the work plane personnel in time to take measures, effectively prevent security incident.
The dual-purpose detection alarm instrument of domestic methane-oxygen manufacturer is more, the general single chip machine controlling circuits that adopt more, and the apparatus structure complexity, volume is big, is not easy to carry.
The utility model content
The purpose of this utility model is to provide a kind of: simple in structure, volume is little, the miniature colliery methane oxygen detection alarm of being convenient to carry.
The purpose of this utility model is achieved in that this alarm comprises power supply, microprocessor, methane detector, oxygen detection device, controller, display unit and audible-visual annunciator, power supply is connected with audible-visual annunciator with microprocessor, methane detector, oxygen detection device, controller, display unit, and methane detector, oxygen detection device, controller, display unit and audible-visual annunciator all are connected with microprocessor.
Described power supply includes integrated regulator (IC1) and intrinsic safety battery pack, and IC1 constitutes voltage stabilizing and power switching module; The intrinsic safety battery pack is that rechargeable battery (E) is connected with current-limiting resistance (R0), the positive pole of the just very intrinsic safety battery pack of rechargeable battery (E), and the other end of current-limiting resistance (R0) is the earth terminal of intrinsic safety battery pack; The positive pole of intrinsic safety battery pack is connected with 1 pin of integrated regulator (IC1), the negative pole of intrinsic safety battery pack is connected with 2 pin of integrated regulator (IC1), between 2 pin of integrated regulator and 4 pin, 2 pin and 5 pin, be connected with electric capacity (C2) and electric capacity (C1) respectively, 5 pin are the positive supply output, and 3 pin are connected with the RA5 pin of microprocessor (IC2) by resistance (R3).
Described microprocessor has microcontroller (IC2), and 1 pin of microcontroller (IC2) is empty pin; 2 pin are connected between resistance (1) and the button (MCLR), and the other end of button (MCLR) is connected with the earth terminal of intrinsic safety battery pack, and 3 pin of microcontroller (IC2) are connected with the central point of the potentiometer (W2) of methane detector, and by electric capacity (C10) ground connection; 4 pin are connected between resistance (R4) and the resistance (R5), and resistance (R4) and resistance (R5) series connection back are in parallel with the intrinsic safety battery pack; 5 pin of microcontroller (IC2) are connected with the positive input terminal of the amplifier (IC4-1) of methane detector by the positive pole of diode (D2); 6 pin are connected with resistance (R18) with the resistance (R17) of methane detector simultaneously; 7 pin are connected with the self-cleaning contact of potentiometer (W3); 8 pin are connected with 3 pin of integrated regulator (IC1) by resistance (R3); 9 pin, 10 pin, 11 pin are empty pin; 12 pin connect power supply positive output end (VCC); 13 pin connect power-output (VSS); 14 pin are connected with crystal oscillating circuit with 15 pin; 17 pin are empty pin; 16 pin are connected with triode (Q1), (Q2), (Q3) and the base stage of (Q4) of display unit with (R9) by resistance (R6), (R7), (R8) respectively with 18 pin, 19 pin, 20 pin; 21 pin, 22 pin and 23 pin also are connected with the positive pole of intrinsic safety battery pack with (R12) by resistance (R10), (R11) respectively simultaneously respectively with 7 pin, 6 pin of clock circuit (IC3) with 5 pin are corresponding is connected; 24 pin are empty pin; 25 pin of microcontroller, 26 pin and 27 pin are corresponding with controller to be connected; 28 pin and 29 pin are empty pin; 30 pin are connected with the base stage of audible-visual annunciator triode (U5) by the negative pole of diode (D1); 31 pin, 32 pin and 33 pin are empty pin; 34 pin connect power-output (VSS); 35 pin connect the intrinsic safety battery anode, simultaneously by electric capacity (C3) ground connection; 36 pin, 37 pin, 38 pin, 39 pin, 41 pin, 42 pin, 43 pin and 44 pin are connected with the light-emitting diode display of display unit; 40 pin are empty pin.
Described methane detector be included as methane transducer (r) and (r0), signal adapter (IC4) and voltage reference device, voltage reference comprises integrated circuit (U8), resistance (R17), (R18) and (R19) resistance (R18) and (R19) the series connection back is in parallel with integrated circuit (U8), simultaneously the end that is connected with integrated circuit of resistance (R18) connects power supply positive output end (VCC) by resistance (R17), integrated circuit (U8) and link ground connection resistance (R19); The link of resistance (R18) and (R19) is connected with the negative input end of signal adapter (IC4-1), and the output of signal adapter (IC4-1) is connected with the base stage of triode (U7), and the emitter stage of triode (U7) connects positive source (VCC); The plus earth of colelctor electrode electrochemical capacitor (C9); On electrochemical capacitor, be parallel with the resistance (R20) of series connection and (R21), be parallel with methane transducer (r) and (r0), be parallel with the resistance (R22) of order series connection, potentiometer (W1) and resistance (R23) methane transducer (r) and (r0) be connected in series, tie point place at methane transducer (r) and (r0) is connected by the positive input terminal of resistance (R25) with signal adapter (IC4-2), the self-cleaning contact of potentiometer (W1) is connected with negative input end by resistance (R24), signal adapter (IC4-2) negative input end is by resistance (R26) and (IC4-2) output, and the output of signal adapter (IC4-2) is by potentiometer (W2) ground connection; Positive input terminal is by resistance (R27) ground connection.
Described audible-visual annunciator, include triode (U5) and (U6), light emitting diode (D1), resistance (R16) and buzzer (HA), the negative pole of light emitting diode (D1) is connected with the RD4 pin of microprocessor (IC2); Positive pole is connected with the base stage of triode (U5), and the colelctor electrode of triode (U5) is connected the grounded emitter of triode (U6) by resistance (R16) with the base stage of triode (U6); Colelctor electrode is connected with an end of buzzer, and the emitter stage of triode (U5) and the other end of buzzer connect positive supply simultaneously.
Described display unit comprises light-emitting diode display and triode (Q1), (Q2), (Q3) and (Q4), (RB6), (RB5), (RB4), (RB3), (RB2), (RB1) of light-emitting diode display and microprocessor and (RB0) is corresponding is connected, light-emitting diode display also by triode (Q1), (Q2), (Q3) and (Q4) connect positive source.
Described controller comprises control button (S1), (S2) and (S3) controls button (S1), (S2) and the equal ground connection of an end (S3); The other end all is connected with the intrinsic safety anode with (R15) by resistance (R13), (R14), control button (S1), (S2) and (S3) respectively and (R15) with resistance (R13), (R14), between the resistance of controlling button and series connection respectively with 25 pin, 26 pin of microprocessor with 27 pin are corresponding is connected.
Described oxygen detection device comprises oxygen sensor element (N) and (Rt), oxygen sensor element (N) and (Rt) in parallel with potentiometer (W3), and the moving point of potentiometer (W3) is connected with the RA2 pin of microprocessor.
Beneficial effect: owing to adopted such scheme, adopt the multi-functional embedded microcontroller of low-power consumption, inside is integrated with a plurality of functional modules, with the hardware circuit of corresponding a small amount of peripheral cell compositional optimization, under the application program effect, instrument gets final product operate as normal, finish the various controls and the calculation function of instrument, make apparatus structure optimization, cost reduces, perfect in shape and function, easy to use; Instrument adopts low power consumption high-precision reference pressure stabilization power pipe to form voltage reference circuit, produces 1.25V and 2.5V voltage reference and supplies with controller and sensor unit circuitry use respectively, thereby improved the precision that detects; Because adopt the intrinsic safety battery pack, instrument can be used for the detection in the inferior explosion-proof place of coal mine; Can continuous measurement go out methane and concentration of oxygen in the environment by methane detector and oxygen detection device, and transfinite when methane concentration, during the oxygen concentration lower bound, send the sound and light alarm signal automatically, alarm point can be provided with in measurement category; Adopt the intrinsic safety battery pack, instrument can be used for the detection in the inferior explosion-proof place of coal mine; Simple in structure, volume is little, is convenient to carry, and has reached the purpose of this utility model.
Advantage: this methane oxygen detection alarm adopts the multi-functional embedded microcontroller of low-power consumption to form hardware circuit, optimizes and simplify circuit design, and the fit applications software program makes apparatus structure optimization, volume extra small, perfect in shape and function, easy to use; Instrument is provided with low-voltage indication, under-voltage is shut down automatically, and circuit such as high protection prolong instrument application life; Adopt full surface mounting technology, apparatus structure is reasonable, and volume is extra small, is easy to carry.
Description of drawings
Fig. 1 is a miniature colliery methane oxygen detection alarm circuit structure diagram.
Fig. 2 is a miniature colliery methane oxygen detection alarm structure scheme of installation.
Among Fig. 2: 1, be methane transducer; 2, be light-emitting diode display; 3, be casing; 4, be power switch; 5, for zero point/alarm point key is set; 6, be full scale adjustment/display switching key; 7 is oxygen sensor.
The specific embodiment
Embodiment 1: this alarm comprises power supply, microprocessor, methane detector, oxygen detection device, controller, display unit and audible-visual annunciator, power supply is connected with audible-visual annunciator with microprocessor, methane detector, oxygen detection device, controller, display unit, and methane detector, oxygen detection device, controller, display unit and audible-visual annunciator all are connected with microprocessor.
Described power supply includes integrated regulator IC1 and intrinsic safety battery pack, and IC1 constitutes voltage stabilizing and power switching module; The intrinsic safety battery pack is that rechargeable battery E connects with current-limiting resistance R0, the positive pole of the just very intrinsic safety battery pack of rechargeable battery E, and the other end of current-limiting resistance R0 is the earth terminal of intrinsic safety battery pack; The positive pole of intrinsic safety battery pack is connected with 1 pin of integrated regulator IC1, the negative pole of intrinsic safety battery pack is connected with 2 pin of integrated regulator IC1, between 2 pin of integrated regulator and 4 pin, 2 pin and 5 pin, be connected with capacitor C 2 and capacitor C 1 respectively, 5 pin are the positive supply output, 3 pin are connected with the RA5 pin of microprocessor IC2 by resistance R 3, the intrinsic safety battery pack with after current-limiting resistance R0 connects, with the epoxide-resin glue envelope, constitutes the intrinsic safety battery pack with rechargeable battery E.
Described microprocessor has microcontroller IC2, and 1 pin of microcontroller IC2 is empty pin; 2 pin are connected between resistance R 1 and the button MCLR, and the other end of button MCLR is connected with the earth terminal of intrinsic safety battery pack, and 3 pin of microcontroller IC2 are connected with the central point of the potentiometer W2 of methane detector, and by capacitor C 10 ground connection; 4 pin are connected between resistance R 4 and the resistance R 5, and resistance R 4 and resistance R 5 series connection backs are in parallel with the intrinsic safety battery pack; 5 pin of microcontroller IC2 are connected with the positive input terminal of the amplifier IC4-1 of methane detector by the positive pole of diode D2; 6 pin are connected with resistance R 18 with the resistance R 17 of methane detector simultaneously; 7 pin are connected with the self-cleaning contact of potentiometer W3; 8 pin are connected with 3 pin of integrated regulator IC1 by resistance R 3; 9 pin, 10 pin, be empty pin; 11 pin meet power supply positive output end VCC; 12 pin meet power-output VSS; 13 pin, 14 pin and 15 pin are connected with crystal oscillating circuit; 17 pin are empty pin; 16 pin are connected with the base stage of triode Q1, Q2, Q3 and the Q4 of display unit by resistance R 6, R7, R8 and R9 respectively with 18 pin, 19 pin, 20 pin; 21 pin, 22 pin and 23 pin also are connected with the positive pole of intrinsic safety battery pack with R12 by resistance R 10, R11 respectively simultaneously respectively with 7 pin, 6 pin of clock circuit IC3 with 5 pin are corresponding is connected; 24 pin are empty pin; 25 pin of microcontroller, 26 pin and 27 pin are corresponding with controller to be connected; 28 pin and 29 pin are empty pin; 30 pin are connected with the base stage of audible-visual annunciator triode U5 by the negative pole of diode D1; 31 pin, 32 pin and 33 pin are empty pin; 34 pin connect positive source; 35 pin connect the intrinsic safety battery anode, simultaneously by capacitor C 3 ground connection; 36 pin, 37 pin, 38 pin, 39 pin, 41 pin, 42 pin, 43 pin and 44 pin are connected with the light-emitting diode display of display unit; 40 pin are empty pin.
IC2 is the multi-functional embedded microcontroller of low-power consumption, inside is integrated with functional modules such as A/D module, TMR module, EEPROM data storage FLASN program storage, with respective peripheral element composition hardware circuit, fit applications software program, finish the various controls and the calculation function of instrument; IC3 is a clock circuit.
Described methane detector is included as methane transducer r and r0, signal adapter IC4 and voltage reference device, voltage reference comprises that integrated circuit U8, resistance R 17, R18 and R19 resistance R 18 and R19 are in parallel with integrated circuit U8 after connecting, simultaneously the end that is connected with integrated circuit of resistance R 18 meets power supply positive output end VCC by resistance R 17, integrated circuit U8 and link ground connection resistance R 19; The link of resistance R 18 and R19 is connected with the negative input end of signal adapter IC4-1, and the output of signal adapter IC4-1 is connected with the base stage of triode U7, and the emitter stage of triode U7 meets positive source VCC; The plus earth of colelctor electrode electrochemical capacitor C9; On electrochemical capacitor, be parallel with series connection resistance R 20 and R21, be parallel with methane transducer r and r0, be parallel with resistance R 22, potentiometer W1 and the resistance R 23 of order series connection, methane transducer r and r0 are connected in series, tie point place at methane transducer r and r0 is connected by the positive input terminal of resistance R 25 with signal adapter IC4-2, the self-cleaning contact of potentiometer W1 is connected with negative input end by resistance R 24, signal adapter IC4-2 negative input end is by resistance R 26 and IC4-2 output, and the output of signal adapter IC4-2 is by potentiometer W2 ground connection; Positive input terminal is by resistance R 27 ground connection.
U8 and R17, R18 and R19 form voltage reference circuit, produce 1.25V and 2.5V voltage reference and supply with controller and sensor unit circuitry use respectively.R, r0 are the methane sensing element,
Described audible-visual annunciator includes triode U5 and U6, light emitting diode D1, resistance R 16 and buzzer HA, and the negative pole of light emitting diode D1 is connected with the RD4 pin of microprocessor IC2; Positive pole is connected with the base stage of triode U5, and the colelctor electrode of triode U5 is connected the grounded emitter of triode U6 by resistance R 16 with the base stage of triode U6; Colelctor electrode is connected with an end of buzzer, and the emitter stage of triode U5 and the other end of buzzer connect positive supply simultaneously.
Described display unit comprises light-emitting diode display and triode Q1, Q2, Q3 and Q4, the corresponding connection of RB6, RB5, RB4, RB3, RB2, RB1 and RB0 of light-emitting diode display and microprocessor, light-emitting diode display also connects positive source by triode Q1, Q2, Q3 and Q4.
Described controller comprises control button S1, S2 and S3, the equal ground connection of an end of control button S1, S2 and S3; The other end all is connected with the intrinsic safety anode by resistance R 13, R14 and R15, control button S1, S2 and S3 respectively with resistance R 13, R14 and R15, between the resistance of control button and series connection respectively with 25 pin, 26 pin of microprocessor with 27 pin are corresponding is connected.Wherein S1 is a switch, and S2 is that adjustment at zero point and alarm point are provided with button, and S3 is that full scale adjustment and methane, oxygen show switching key.
Described oxygen detection device comprises oxygen sensor element N and Rt, and oxygen sensor element N and Rt are in parallel with potentiometer W3, and the moving point of potentiometer W3 is connected with the RA2 pin of microprocessor.N, Rt are the oxygen sensor element.
The detection alarm instrument has casing 3, is furnished with methane transducer 1, light-emitting diode display 2, power switch 4, zero point/alarm point on the panel of casing 3 key 5, full scale adjustment/display switching key 6 and oxygen sensor 7 are set.
The components and parts that use in the detection alarm instrument are: IC1 model: LP3985/3.3V; IC2 model: PIC16LF871; IC3 model: DS1302; IC4 model: LM358; U8 model: LM385/2.5V; Methane transducer model: LX-7; Oxygen sensor model: 4OX-2.
Claims (8)
1. miniature colliery methane oxygen detection alarm, it is characterized in that: this alarm comprises power supply, microprocessor, methane detector, oxygen detection device, controller, display unit and audible-visual annunciator, power supply is connected with audible-visual annunciator with microprocessor, methane detector, oxygen detection device, controller, display unit, and methane detector, oxygen detection device, controller, display unit and audible-visual annunciator all are connected with microprocessor.
2. miniature colliery according to claim 1 methane oxygen detection alarm, it is characterized in that: described power supply includes integrated regulator (IC1) and intrinsic safety battery pack, and integrated regulator (IC1) constitutes voltage stabilizing and power switching module; The intrinsic safety battery pack is that rechargeable battery (E) is connected with current-limiting resistance (R0), the positive pole of the just very intrinsic safety battery pack of rechargeable battery (E), and the other end of current-limiting resistance (R0) is the earth terminal of intrinsic safety battery pack; The positive pole of intrinsic safety battery pack is connected with 1 pin of integrated regulator (IC1), the negative pole of intrinsic safety battery pack is connected with 2 pin of integrated regulator (IC1), between 2 pin of integrated regulator and 4 pin, 2 pin and 5 pin, be connected with electric capacity (C2) and electric capacity (C1) respectively, 5 pin are the positive supply output, and 3 pin are connected with the RA5 pin of microprocessor (IC2) by resistance (R3).
3. miniature colliery according to claim 1 methane oxygen detection alarm, it is characterized in that: described microprocessor has microcontroller (IC2), and 1 pin of microcontroller (IC2) is empty pin; 2 pin are connected between resistance (1) and the button (MCLR), and the other end of button (MCLR) is connected with the earth terminal of intrinsic safety battery pack, and 3 pin of microcontroller (IC2) are connected with the central point of the potentiometer (W2) of methane detector, and by electric capacity (C10) ground connection; 4 pin are connected between resistance (R4) and the resistance (R5), and resistance (R4) and resistance (R5) series connection back are in parallel with the intrinsic safety battery pack; 5 pin of microcontroller (IC2) are connected with the positive input terminal of the amplifier (IC4-1) of methane detector by the positive pole of diode (D2); 6 pin are connected with resistance (R18) with the resistance (R17) of methane detector simultaneously; 7 pin are connected with the self-cleaning contact of potentiometer (W3); 8 pin are connected with 3 pin of integrated regulator (IC1) by resistance (R3); 9 pin, 10 pin, 11 pin are empty pin; 12 pin connect power supply positive output end (VCC); 13 pin connect power-output (VSS); 14 pin are connected with crystal oscillating circuit with 15 pin; 17 pin are empty pin; 16 pin are connected with triode (Q1), (Q2), (Q3) and the base stage of (Q4) of display unit with (R9) by resistance (R6), (R7), (R8) respectively with 18 pin, 19 pin, 20 pin; 21 pin, 22 pin and 23 pin also are connected with the positive pole of intrinsic safety battery pack with (R12) by resistance (R10), (R11) respectively simultaneously respectively with 7 pin, 6 pin of clock circuit (IC3) with 5 pin are corresponding is connected; 24 pin are empty pin; 25 pin of microcontroller, 26 pin and 27 pin are corresponding with controller to be connected; 28 pin and 29 pin are empty pin; 30 pin are connected with the base stage of audible-visual annunciator triode (U5) by the negative pole of diode (D1); 31 pin, 32 pin and 33 pin are empty pin; 34 pin connect power-output (VSS); 35 pin connect the intrinsic safety battery anode, simultaneously by electric capacity (C3) ground connection; 36 pin, 37 pin, 38 pin, 39 pin, 41 pin, 42 pin, 43 pin and 44 pin are connected with the light-emitting diode display of display unit; 40 pin are empty pin.
4. miniature colliery according to claim 1 methane oxygen detection alarm, it is characterized in that: described methane detector be included as methane transducer (r) and (r0), signal adapter (IC4) and voltage reference device, voltage reference comprises integrated circuit (U8), resistance (R17), (R18) and (R19) resistance (R18) and (R19) the series connection back is in parallel with integrated circuit (U8), simultaneously the end that is connected with integrated circuit of resistance (R18) connects power supply positive output end (VCC) by resistance (R17), integrated circuit (U8) and link ground connection resistance (R19); The link of resistance (R18) and (R19) is connected with the negative input end of signal adapter (IC4-1), and the output of signal adapter (IC4-1) is connected with the base stage of triode (U7), and the emitter stage of triode (U7) connects positive source (VCC); The plus earth of colelctor electrode electrochemical capacitor (C9); On electrochemical capacitor, be parallel with the resistance (R20) of series connection and (R21), be parallel with methane transducer (r) and (r0), be parallel with the resistance (R22) of order series connection, potentiometer (W1) and resistance (R23), methane transducer (r) and (r0) be connected in series, tie point place at methane transducer (r) and (r0) is connected by the positive input terminal of resistance (R25) with signal adapter (IC4-2), the self-cleaning contact of potentiometer (W1) is connected with negative input end by resistance (R24), signal adapter (IC4-2) negative input end is by resistance (R26) and (IC4-2) output, and the output of signal adapter (IC4-2) is by potentiometer (W2) ground connection; Positive input terminal is by resistance (R27) ground connection.
5. miniature colliery according to claim 1 methane oxygen detection alarm, it is characterized in that: described audible-visual annunciator, include triode (U5) and (U6), light emitting diode (D1), resistance (R16) and buzzer (HA), the negative pole of light emitting diode (D1) is connected with the RD4 pin of microprocessor (IC2); Positive pole is connected with the base stage of triode (U5), and the colelctor electrode of triode (U5) is connected the grounded emitter of triode (U6) by resistance (R16) with the base stage of triode (U6); Colelctor electrode is connected with an end of buzzer, and the emitter stage of triode (U5) and the other end of buzzer connect positive supply simultaneously.
6. miniature colliery according to claim 1 methane oxygen detection alarm, it is characterized in that: described display unit comprises light-emitting diode display and triode (Q1), (Q2), (Q3) and (Q4), (RB6), (RB5), (RB4), (RB3), (RB2), (RB1) of light-emitting diode display and microprocessor and (RB0) is corresponding is connected, light-emitting diode display also by triode (Q1), (Q2), (Q3) and (Q4) connect positive source.
7. miniature colliery according to claim 1 methane oxygen detection alarm is characterized in that: described controller comprises control button (S1), (S2) and (S3) controls button (S1), (S2) and the equal ground connection of an end (S3); The other end all is connected with the intrinsic safety anode with (R15) by resistance (R13), (R14), control button (S1), (S2) and (S3) respectively and (R15) with resistance (R13), (R14), between the resistance of controlling button and series connection respectively with 25 pin, 26 pin of microprocessor with 27 pin are corresponding is connected.
8. miniature colliery according to claim 1 methane oxygen detection alarm, it is characterized in that: described oxygen detection device comprises oxygen sensor element (N) and (Rt), oxygen sensor element (N) and (Rt) in parallel with potentiometer (W3), the moving point of potentiometer (W3) is connected with the RA2 pin of microprocessor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202432100U CN201705394U (en) | 2010-06-25 | 2010-06-25 | Miniature methane-oxygen diction and alarm instrument for mine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202432100U CN201705394U (en) | 2010-06-25 | 2010-06-25 | Miniature methane-oxygen diction and alarm instrument for mine |
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| CN201705394U true CN201705394U (en) | 2011-01-12 |
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| CN2010202432100U Expired - Fee Related CN201705394U (en) | 2010-06-25 | 2010-06-25 | Miniature methane-oxygen diction and alarm instrument for mine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108561185A (en) * | 2018-04-09 | 2018-09-21 | 栾彦锋 | Oxygen therapy warning device for mine detection |
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2010
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108561185A (en) * | 2018-04-09 | 2018-09-21 | 栾彦锋 | Oxygen therapy warning device for mine detection |
| CN108561185B (en) * | 2018-04-09 | 2019-07-26 | 栾彦锋 | Oxygen therapy warning device for mine detection |
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Granted publication date: 20110112 Termination date: 20120625 |