CN105137024A - Combustible gas sensor - Google Patents
Combustible gas sensor Download PDFInfo
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- CN105137024A CN105137024A CN201410240021.0A CN201410240021A CN105137024A CN 105137024 A CN105137024 A CN 105137024A CN 201410240021 A CN201410240021 A CN 201410240021A CN 105137024 A CN105137024 A CN 105137024A
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Abstract
The invention discloses a combustible gas sensor. The combustible gas sensor comprises a shell, a handle, a sensor joint, a gas chamber, display windows, a power supply lamp, an alarm lamp, an alarm window and a one-chip microcomputer, and also comprises the four following buttons: a shift/+ button, a return/- button, a switch/conversion button and a reading/confirm button, and the methane detection state, the clock state, the alarm point, the power-off point, the unlocking point and the methane detection state are observed through the shift/+ button in a cycle manner; the current state is switched to the methane detection state through the return/- button; the on and off of the sensor are controlled through the switch/conversion button; the reading/confirm button allows the sensor to enter a reading state in order to observe the methane concentration storage record at different times; and debugging of the sensor is completed through cooperation of the four buttons. The program of the sensor can be restored to factory settings through the one-chip microcomputer, so performance test is avoided, and the test process is metered; and a vehicle is restarted after program restoration to normal run.
Description
Technical field
The present invention relates to sensor field, be specifically related to a kind of combustible gas sensor.
Background technology
Cutoff instrument principle of work
After start, the digital signal of sensor send cutoff instrument, is processed by single-chip microcomputer, drives digital indicator directly to demonstrate the methane concentration of tested gas.In fresh air, sensor bridge circuit is in equilibrium state, and after one minute, cutoff instrument is powered to relay, relay contact adhesive, and controlled device runs.
When methane concentration meets or exceeds alarming value, cutoff instrument controls light crossing-signal immediately and sends red flashing light, sounds the alarm simultaneously.
When methane concentration meets or exceeds power-down value, cutoff instrument controls light power-off alarm immediately and sends flashed green, stops immediately powering to relay simultaneously, and relay contact disconnects, and controlled device is out of service.
By Single-chip Controlling, power-off is after one minute, if methane concentration is still more than solution drop lock or solution drop lock, then continue power-off by Single-chip Controlling, if methane concentration is below solution drop lock, single-chip microcomputer will stop light power-off alarm harmony power-off alarm to report to the police immediately, recover to power to relay simultaneously, relay contact adhesive, controlled device resumes operation.
Sensor operating principles
Sensor adopts heat catalytic element composition Hui Shi electric bridge, gage beam is formed by carrier catalyst element (being commonly called as black element) and pure carrier element (being commonly called as white element), form sub-arm by metalfilmresistor and potentiometer, mu balanced circuit provides stable voltage for electric bridge.Equilibrium state is on fresh air jackshaft road, in tested gas, gas (methane) is black element surface generation catalytic oxidation (flameless burning), black component temperature is increased, resistance increases, bridge road out of trim, thus export a potential difference (PD) (within the specific limits, its size is directly proportional to the concentration of methane).
This potential difference (PD) send single-chip microcomputer to carry out digital processing after amplifying.Digital signal after digital processing send driving circuit, drives numeral method to go out the methane concentration of tested gas.When methane concentration meets or exceeds alarming value, single-chip microcomputer exports control signal immediately, controls sound alarm subsystem and sounds the alarm, make red alarm lamp glittering simultaneously through warning circuit.
When methane concentration meets or exceeds power-down value, red numerical is glittering, and sends power-off signal to cutoff instrument.Cutoff instrument stops powering to relay immediately, and relay contact disconnects, and controlled device is out of service.
Controlled by sensor, power-off is after one minute, if methane concentration is still more than solution drop lock or solution drop lock, then controlled to continue power-off by sensor, if methane concentration is below solution drop lock, sensor will stop red numerical glittering, recover immediately to power to relay simultaneously, relay contact adhesive, controlled device resumes operation.
Combustible gas sensor single-chip microcomputer is operated in has gas and coal dust explosion hazard underground coal mine, the place of many gas interference, sharp pounding, trickle.Interference is caused to gas sensor probe, when this potential difference (PD) send single-chip microcomputer to carry out digital processing after amplifying, error occurs, causes single-chip microcomputer overload operation, form misprogramming and deadlock.Gas sensor misprogramming and deadlock can cause gas cutoff instrument to vehicle power-off, the vehicle run is caused to stop in emergency, can not start vehicle after reopening vehicle power supply, after must keeping in repair or changing combustible gas sensor, vehicle could normally use.
When prior art, first: gas sensor be keeped in repair to normal condition, shell removable parts components and parts be opened, then do performance test, metrology and measurement.Do a product also will bother than newly.Second: because maintenance or replacing combustible gas sensor, so vehicle can not run, keep in repair to coal mine ground maintenance factory after mine can only being hauled out by trailer.
Summary of the invention
The object of the invention is to: providing one sensor Single Chip Microcomputer (SCM) program can be returned to Default Value for overcoming the above problems, avoiding doing performance test again, metrology and measurement process; Just vehicle can be restarted, the normal combustible gas sensor run after program recovery.
The technical solution adopted in the present invention is such:
Combustible gas sensor, comprise casing, carrying handle, sensor connector, air chamber, display window, power lights, alarm lamp, window annunciator, single-chip microcomputer, it also comprises 4 buttons, be gear shift /+key respectively, return/-key, switch/shift key, reading/acknowledgement key, come view (sites) in turn CH_4 detection state, clock status, alarm set point, power-off point by described gear shift /+key, unlock point, CH_4 detection state; By describedly returning/sensor current state switches to CH_4 detection state by-key; The switch being controlled sensor by described switch/shift key is closed; Sensor is made to enter reading state by described reading/acknowledgement key, the methane concentration stored record of viewing different time points; The mode of sensor single-chip microcomputer control program is completed by the cooperation of 4 keys.
Further, it also comprises remote control window, and by telepilot Long-distance Control, on this telepilot, button is identical with button on described sensor.
Further, described reading/acknowledgement key makes sensor enter reading state, and ceaselessly button can show the different methane concentrations of different time points, the methane concentration checking continuous 120 time points capable of circulation.
Further, this sensor is furnished with standby power supply.
In sum, owing to adopting technique scheme, the invention has the beneficial effects as follows:
A key recovery routine installed by combustible gas sensor single-chip microcomputer, one key recovery routine, need not keep in repair and change combustible gas sensor, as long as operate to specifications, just can the program recovery of sensor single-chip microcomputer to factory state or Initialize installation in short time, avoid and open shell removable parts components and parts, then do performance test, metrology and measurement process; One key just can reopen vehicle power supply after recovering just can start vehicle, and normally run, avoiding vehicle can not run.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Mark in figure: 1, casing; 2, carrying handle; 3, sensor connector; 4, air chamber; 5, display window; 5, power lights; 6, alarm lamp; 7, window annunciator; 8, single-chip microcomputer; 9, gear shift /+key; 10 ,/-key is returned; 11, switch/shift key; 12, reading/acknowledgement key; 13, remote control window.
Embodiment
In order to make content of the present invention more easily be clearly understood, below according to specific embodiment also by reference to the accompanying drawings, the present invention is further detailed explanation.
As shown in Figure 1, combustible gas sensor, comprise casing, carrying handle, sensor connector, air chamber, display window, power lights, alarm lamp, window annunciator, single-chip microcomputer, it also comprises 4 buttons, be gear shift /+key respectively, return/-key, switch/shift key, reading/acknowledgement key, come view (sites) in turn CH_4 detection state, clock status, alarm set point, power-off point by described gear shift /+key, unlock point, CH_4 detection state; By describedly returning/sensor current state switches to CH_4 detection state by-key; The switch being controlled sensor by described switch/shift key is closed; Sensor is made to enter reading state by described reading/acknowledgement key, the methane concentration stored record of viewing different time points; The mode of sensor single-chip microcomputer control program is completed by the cooperation of 4 keys.
It also comprises remote control window, and by telepilot Long-distance Control, on this telepilot, button is identical with button on described sensor.
Described reading/acknowledgement key makes sensor enter reading state, and ceaselessly button can show the different methane concentrations of different time points, the methane concentration checking continuous 120 time points capable of circulation.
This sensor is furnished with standby power supply, with the sensor of standby power supply, does not need cutoff instrument power transmission, can carry out debugging or working; Debug or after hours, should shut down to protect standby power supply.
The using method of inflammable gas sensor:
Open sensor bonnet, can see connection terminal from right-to-left 15V, signal, connect respectively the 15A of cutoff instrument, letter A.(if cutoff instrument connects two sensors, then the 2nd sensor 15V, signal just connect cutoff instrument 15B, letter B).
Digital transmission standard (Default Value) between sensor and cutoff instrument, to connect with other equipment (having to pass through explosion-proof joint inspection) need by other standard time, must change connection, method is as follows:
(1) frequency standard, changes the short circuit numeral in printed board into short-circuit frequency.
(2) electric current standard, changes the short-circuit frequency numeral in printed board into short-circuit current.
On inspection wiring errorless after, cutoff instrument power transmission, namely sensor enters open state.First show 0.00, after 5 seconds, automatically enter CH_4 detection state.
1, watch clock, alarm set point, power-off point and unlock point
Be in CH_4 detection state after sensor start, press gear shift /+key (hereinafter referred to as B key), namely enter clock status, front 2 displays hour, rear 2 displays point, intermediate point flicker per second once.Press B key again, enter alarm set point state, front 1 display P, represents alarm set point, rear 3 display alarm point values.Press B key again, enter power-off dotted state, front 1 display C, represents power-off point, rear 3 display power-off point values.Press B key again, enter unblock dotted state, front 1 display J, represent and unlock point, rear 3 displays unlock point value.If press B key again, then CH_4 detection state got back to again by sensor, thus forms the viewing mode of five circulations.
2, state returns
Which kind of state tube sensor is not in, if press return key/-(hereinafter referred to as C key), sensor returns CH_4 detection state immediately.
3, stored record is watched
Pinning reading (confirmation) key (hereinafter referred to as D key) 2 seconds more than to loose one's grip, there are READ printed words in display window again, represents that sensor has entered reading (viewing stored record) state.Press D key again, time of occurrence, then press D key, occur the methane concentration of this time, form the 1st frame data.Repeat aforesaid operations, the data of all 120 frames can be watched one by one.When watching the 120th frame data, next frame is the 1st viewed frame data, thus forms the mode of stored record view (sites) in turn.Stand-by period after each operation can not more than 5 seconds, otherwise sensor will exit reading state automatically, returns CH_4 detection state.
4, shut down
Pin ON/OFF shift key (hereinafter referred to as A key) 2 seconds more than to loose one's grip, luminous digital extinguishes, and sensor cuts out voluntarily again.
5, start shooting
Pin more than A key 2 second to loose one's grip, namely sensor is opened again.
When 6, using a teleswitch, keying method is same as described above.
7, standby power supply
Sensor can adapted standby power supply.With the sensor of standby power supply, do not need cutoff instrument power transmission, can carry out debugging or working.Debug or after hours, should shut down to protect standby power supply.
Sensor adjustment method:
1, the debugging of methane
(1), the inspection at zero point and adjustment
In fresh air, start shooting 10 minutes, after value stabilization to be shown, observe whether displayed value is 0.00, otherwise should adjustment at zero point be carried out.When carrying out adjusting zero point, should first press A key, press D key again within 1 second, now the decimal of last position is lighted, and represents that sensor has entered zeroing (the 1st) state.Repeating to press B key can make displayed value progressively increase, and repeats to press C key and displayed value can be made to successively decrease, carry out aforesaid operations, make displayed value be 0.00, then press D key and confirm and exit zeroing state, return CH_4 detection state, and zero point, adjustment terminated.
(2), the inspection of precision and calibration
Only have the sensor after zero crossing adjustment can carry out inspection and the calibration of precision.
The air chamber of sensor is put correction valve, passes into the CH4 Standard Gases sample that concentration is about 2%, control flow at 200ml/min, after value stabilization to be shown, observe whether displayed value is Standard Gases sample value, otherwise should accuracy calibration be carried out.
When carrying out accuracy calibration, should first press A key, press D key again within 1 second, now the decimal of last position is lighted, and represents that sensor has entered the 1st state.Repeat aforesaid operations, now the first decimal is lighted, and represents that sensor has entered accuracy calibration (the 2nd) state.Repeating to press B key can make displayed value progressively increase, and repeats to press C key and displayed value can be made to successively decrease, press A key and can change the speed of progressively increasing or successively decreasing, carry out aforesaid operations, make displayed value be Standard Gases sample value, then press D key and confirm and exit accuracy calibration state, return CH_4 detection state, accuracy calibration terminates.
2, the debugging of clock
What a prepares through calibrated standard time clock.Press B key after start and enter clock status, whether unanimously with standard time clock observe displayed value, if error is more than 1 minute, can adjust.
When adjusting, should first press A key, press D key again within 1 second, now the decimal of last position is lighted, and represents that sensor has entered clock adjustment (the 1st) state.Repeating to press B key can make hourage or the number of minutes progressively increase, repeating to press C key can make hourage or the number of minutes successively decrease, pressing A key, can to change what progressively increase or successively decrease be hourage or the number of minutes, carry out aforesaid operations, displayed value is made to be standard time clock value, then press D key confirm and exit clock adjustment state, return clock display state, clock adjustment terminates.
Be in course of adjustment, press C key and hourage or the number of minutes can only be made to be decremented to till 00, then press C key by inoperative; Pressing B key can only make hourage progressively increase to 23, and the number of minutes progressively increases to 59, then presses B key by inoperative.
3, the debugging of alarm set point
Press B key after start and enter alarm set point state 2 times, display P1.00 (factory-set value), if user requires change, can adjust.
During adjustment, should first press A key, press D key again within 1 second, now the decimal of last position is lighted, and represents that sensor has entered alarm set point adjustment (the 1st) state.Repeating to press B key can make displayed value progressively increase, and repeats to press C key and displayed value can be made to successively decrease, carry out aforesaid operations, make displayed value be user's required value, and then press D key and confirm and exit alarm set point adjustment state, return alarm set point state, adjustment terminates.
4, the debugging of power-off point
Press B key after start and enter power-off dotted state 3 times, display C1.50 (factory-set value), if user requires change, can adjust.
During adjustment, should first press A key, press D key again within 1 second, now the decimal of last position is lighted, and represents that sensor has entered power-off point adjustment (the 1st) state.Repeating to press B key can make displayed value progressively increase, and repeats to press C key and displayed value can be made to successively decrease, carry out aforesaid operations, make displayed value be user's required value, and then press D key and confirm and exit power-off point adjustment state, return power-off dotted state, adjustment terminates.
5, the debugging of point is unlocked
Press B key after start and enter unblock dotted state 4 times, display J0.50 (factory-set value), if user requires change, can adjust.
During adjustment, should first press A key, press D key again within 1 second, now the decimal of last position is lighted, and represents that sensor has entered and unlocks some adjustment (the 1st) state.Repeating to press B key can make displayed value progressively increase, and repeats to press C key and displayed value can be made to successively decrease, carry out aforesaid operations, make displayed value be user's required value, and then press D key and confirm and exit to unlock some adjustment state, return unblock dotted state, adjustment terminates.
Above mode is all completed by the cooperation of four keys, avoids when a failure occurs and opens shell removable parts components and parts, then do performance test, metrology and measurement process; Just can reopen vehicle power supply just can start vehicle to program recovery later, and normally run, avoiding vehicle can not run.
Above-described specific embodiment; object of the present invention, technical scheme and beneficial effect are further described; be understood that; the foregoing is only specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (4)
1. combustible gas sensor, comprise casing, carrying handle, sensor connector, air chamber, display window, power lights, alarm lamp, window annunciator, single-chip microcomputer, it is characterized in that: it also comprises 4 buttons, be gear shift /+key respectively, return/-key, switch/shift key, reading/acknowledgement key, come view (sites) in turn CH_4 detection state, clock status, alarm set point, power-off point by described gear shift /+key, unlock point, CH_4 detection state; By describedly returning/sensor current state switches to CH_4 detection state by-key; The switch being controlled sensor by described switch/shift key is closed; Sensor is made to enter reading state by described reading/acknowledgement key, the methane concentration stored record of viewing different time points; The mode of sensor single-chip microcomputer control program is completed by the cooperation of 4 keys.
2. combustible gas sensor according to claim 1, is characterized in that: it also comprises remote control window, and by telepilot Long-distance Control, on this telepilot, button is identical with button on described sensor.
3. combustible gas sensor according to claim 1, it is characterized in that: described reading/acknowledgement key makes sensor enter reading state, ceaselessly button can show the different methane concentrations of different time points, the methane concentration checking continuous 120 time points capable of circulation.
4. combustible gas sensor according to claim 1, is characterized in that: this sensor is furnished with standby power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410240021.0A CN105137024A (en) | 2014-06-03 | 2014-06-03 | Combustible gas sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410240021.0A CN105137024A (en) | 2014-06-03 | 2014-06-03 | Combustible gas sensor |
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| CN105137024A true CN105137024A (en) | 2015-12-09 |
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| CN201410240021.0A Pending CN105137024A (en) | 2014-06-03 | 2014-06-03 | Combustible gas sensor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106896181A (en) * | 2015-12-18 | 2017-06-27 | 上海昱丽环境科技有限公司 | A kind of five in one gas sensor and operation method |
| CN108020634A (en) * | 2017-12-07 | 2018-05-11 | 长沙格力暖通制冷设备有限公司 | Nitrogen gas concn detection method and device |
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| CN108020634A (en) * | 2017-12-07 | 2018-05-11 | 长沙格力暖通制冷设备有限公司 | Nitrogen gas concn detection method and device |
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Application publication date: 20151209 |