CN2397490Y - Household gas alarm - Google Patents
Household gas alarm Download PDFInfo
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- CN2397490Y CN2397490Y CN 99251623 CN99251623U CN2397490Y CN 2397490 Y CN2397490 Y CN 2397490Y CN 99251623 CN99251623 CN 99251623 CN 99251623 U CN99251623 U CN 99251623U CN 2397490 Y CN2397490 Y CN 2397490Y
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Abstract
The utility model relates to a household gas combustible alarm, which comprises a gas sensor 2, a power supply circuit 3, an alarm circuit 4, a temperature/humidity sensor 5 and a display screen 6, wherein, the alarm circuit 4 comprises a single chip computer 41, a crystal vibration circuit 42 which carries out one-way connection with the single chip computer 41, an audible and visual alarm circuit 43, a heating circuit 44, a display drive circuit 45 which carries out double-way connection with the single chip computer 41, a storage 46, a resetting/testing circuit 41 and a power up/testing circuit 48. The inner part of the single chip computer 41 is solidified with a software program P. The device of the utility model has the audible and visual alarm of a common alarm, besides the utility model can also realize the liquid crystal digital display alarm according to temperature and humidity in current environment and the concentration of the combustible gas.
Description
The utility model relates to the domestic safety apparatus field, relates in particular to a kind of domestic gas alarm.
Existing gas sensor generally adopts heater-type gas sensor MQK1, and power circuit provides alarm required loop voltage V
CC, the heating voltage V of sensor MQK1
H, the logic kinetic energy of circuit is by a comparer T
1Form with corresponding Resistor-Capacitor Unit and transistor (or IC), Fig. 1 is a kind of commercially available common domestic gas alarm circuit synoptic diagram.R wherein
2And R
3Form a voltage divider, comparer T is provided
1The comparative level of a setting (reference level) V
1During the design alarm, importantly by regulating adjustable resistance R
LDetermine one comply with the national standard requirements open the newspaper combustable gas concentration, i.e. gas concentration limit C
L, combustable gas concentration C in current environment
1＜C
LThe time, pull-up resistor R
LOn voltage be lower than comparer T
11The level of pin, comparer is kept normal operating conditions, and alarm is not reported to the police.When the inflammable gas leakage takes place when, combustable gas concentration Ci 〉=C in the environment
LThe time, MQK1 is reduced rapidly by its impedance of effect of combustable gas concentration, causes the R that flows through
LElectric current increase, cause pull-up resistor R
LThe very fast rising of last voltage, T
12 pin level are higher than 1 pin level, T
1Output state overturns, and circuit enters alarm condition.
The domestic gas alarm of Xiao Shouing in the market, the alarm that comes to this and similar this class alarm of temperature compensation a little, promptly only in environment, specify gas concentration to surpass certain combustable gas concentration, after the limit value of gas concentration warning just, just produce sound and the light warning signal of setting, this has the shortcoming of two aspects at least: the one, and the combustable gas concentration alarm limit is set inaccurate.Because having with environment temperature, humidity the response sensitivity of combustable gas concentration, gas sensitive device is closely related, be that gas sensitive device produces different sensor output signals to same combustable gas concentration according to different environment temperatures, humidity, in other words, the gas alarm limit that manufacturer sets under certain environment, to the user there its alarm limit is changed automatically because of its environment for use is different, or say that the alarm limit setting is inaccurate.The 2nd, too fuzzy to combustable gas concentration indication in the environment.From the implication of alarm limit as can be known: if alarm is not reported to the police to gas concentration the environment, show its concentration below the warning concentration of certain setting, low actually what, unknown; If report to the police, then know and specify gas concentration in the environment more than the warning concentration of setting, how much high actually, " have nothing to speak " too.This is effective to the contingent safety of taking precautions against lives and properties, but with regard to the strick precaution quality level of personal property, be extremely not enough, as CO (carbon monoxide) warning concentration standard, referring to OHSA (U.S.'s employment security and healthy administration) regulation, best warning concentration limits is set between 100～400ppm.China determines usually at 150～200ppm.Set high like this warning limit value and make its height must be enough to avoid the alarm tetchiness and false alarm and low as to be enough to when the contingent situation occurring occurs, CO is leaked lean out.But learn from scientific information, if the people under 0.01% (100ppm) CO, stop 2-3 hour will slight headache, the time again length will feel sick, have a headache, the time grow again just poison even more serious.If alarm has only the sound and light alarm of alarm limit, the alarm limit of this 150～200ppm just can not guarantee that the resident avoids the chronic injury of poison gas, even makes people lose vigilance, and the heart of feeling at ease is being stood " chronic injury of poison gas ".If there is CO concentration to show that people one see 100ppmCO concentration, will associate, 100ppmCO is very near 150ppmCO, and at the warning edge, vigilance is got up immediately, seeks CO leakage reason at once and is also eradicated, and just can not be subjected to the long-term chronic infringement of poison gas.Equally, for alert event, even CO concentration has only 155ppm in the environment, if do not show that people save one's life for panic the going of this 5ppm that has more in the same old way.As seen, have only the sound and light alarm mode of alarm limit can not guarantee that people have in the heart and handle contingent " number ".If demonstration is arranged, people will take different modes, different rhythm to handle according to the height of warning concentration.If show 200ppm, than 150ppm height not what, people just put current affairs in order if having time, handle CO and leak.If show 600～700ppm, the people will vomit, suffer a shock half an hour in such environment.Certainly will window rapidly, cut off source of the gas, leave the scene, also report to the police.As seen, the alarm that has gas concentration to show has obvious superiority than conventional acoustic light crossing-signal.
The purpose of this utility model is to overcome the deficiencies in the prior art part and provides a kind of accurate and accurate to combustable gas concentration indication in the current environment to the setting of combustable gas concentration alarm limit, and can realize the domestic gas alarm of liquid crystal digital display alarm to current environmental temperature, humidity and combustable gas concentration.
The purpose of this utility model can realize by taking following technical measures: at hardware aspect, increase digital show circuit, the combustable gas concentration that sensitive element is gathered in environment shows; Increase temperature/humidity sensor and corresponding compensating circuit thereof, gather the current humiture of environment, to revise the dependence of gas sensor ambient temperature and humidity.Aspect software, also to increase by 8 single-chip microcomputers, set up the associated databases of combustable gas concentration and humiture, convert the sensing output of gas sensor in the current environment humiture to standard environment (25 ℃ of temperature by editor's operation program, humidity 53%RH) combustable gas concentration output, and make the undulatory property of warning concentration output reduce to minimum.Domestic gas alarm of the present utility model for this reason comprises housing, gas sensor, temperature/humidity sensor, display screen, power circuit and warning circuit; The input of gas sensor, output port connect power circuit and warning circuit respectively.Warning circuit comprises: single-chip microcomputer, with the unidirectional crystal oscillating circuit that is connected of single-chip microcomputer, sound light alarming circuit and heater circuit, and with the two-way display driver circuit that is connected of single-chip microcomputer, reservoir, reset/testing circuit and powering on/testing circuit; The output port of power circuit connects single-chip microcomputer and heater circuit respectively, and heater circuit and gas sensor form the closed-loop path, and the signal output part of temperature/humidity sensor connects a signal input part of single-chip microcomputer, and display screen is connected with display driver circuit is two-way; Also be solidified with software program P in single-chip microcomputer inside.
The drawing of accompanying drawing is described as follows:
Fig. 1 is existing household fuel gas alarm circuit synoptic diagram;
Fig. 2 is the formation block scheme of the utility model household fuel gas alarm;
Fig. 3 is the basic circuit diagram of corresponding diagram 2;
Fig. 4 is a gas sensor heating voltage oscillogram;
Fig. 5 is LCDs constitutional diagram when preheating;
Fig. 6 is the workflow diagram of software program P.
Below in conjunction with accompanying drawing most preferred embodiment of the present utility model is described in further detail.
As shown in Figure 2, domestic gas alarm of the present utility model comprises housing, gas sensor 2, power circuit 3, warning circuit 4, temperature/humidity sensor 5 and display screen 6; The input of gas sensor 2, output port connect power circuit 3 and warning circuit 4 respectively.Warning circuit 4 comprises: single-chip microcomputer 41, with the single-chip microcomputer 41 unidirectional crystal oscillating circuits that are connected 42, sound light alarming circuit 43 and heater circuit 44, and with the single-chip microcomputer 41 two-way display driver circuits that are connected 45, reservoir 46, reset/testing circuit 47 and powering on/testing circuit 48; The output port of power circuit 3 connects single-chip microcomputer 41 and heater circuit 44 respectively, heater circuit 44 forms the closed-loop path with gas sensor 2, the signal output part of temperature/humidity sensor 5 connects a signal input part of single-chip microcomputer 41, display screen 6 and 45 two-way connections of display driver circuit; Also be solidified with software program P in single-chip microcomputer 41 inside.
Fig. 3 is the basic circuit diagram corresponding with Fig. 2; It is the integrated circuit (IC) chip D1 of MC68HC705L1 that single-chip microcomputer 41 wherein adopts model, and its inside is integrated with A/D translation circuit and display driver circuit 45.It is the E of 93C46 that storer 46 adopts model
2PROM storage chip D2, its 1～No. 4 pin is 22,21,20 and No. 19 pin of order sheet machine chip D1 respectively, and its No. 8 pin connect No. 23 pin of chip D1, insert 9～11,24 pin of chip D1 after 5, No. 6 pin parallel connections.51～62,1～6 of display screen 6 and singlechip chip D1 is connected with No. 48 leg.
Described sound light alarming circuit 43 contains triode N1～N4, LED 1～LED3, hummer BUZZER, resistance R 1～R6, R10～R11, the base stage of triode N1～N4 is respectively through 25,28,27, No. 26 leg of resistance R 1, R3, R5, R10 order sheet machine chip D1, their collector meets hummer BUZZER, LED 1, LED2, LED3 through resistance R 2, R4, R6, R11 respectively, the whole ground connection of their emitter.
Described heater circuit 44 contains triode N6～N7, capacitor C 10, C14, resistance R 15～R18, precision resistance RC2; The base stage of triode N7 is divided two-way, and one the tunnel connects 33 pin of chip D1 through resistance R 17, and another road connects gas sensor 2 through capacitor C 10, and two other terminals of described sensor 2 connect the emitter of triode N6 and 38 and 41 pin of chip D1 respectively.
Described crystal oscillating circuit 42 comprises the closed-loop path of being made up of crystal oscillator XTAL, capacitor C 8～C9, resistance R 7, and its signal output part connects with 44,45 of singlechip chip D1 and is connected.
No. 1 pin of described temperature/humidity sensor 5 connect chip D1 41 pin, power on/testing circuit 48 and heater circuit 44, No. 2 pin connect 35 and 33 pin of chip D1, No. 3 pin connect 29,30,40,42 pin of chip D1, No. 4 pin is divided into two branch roads, one the tunnel connects 36 pin of chip D1, and another road is through 2, No. 3 pin of resistance R Cl and temperature/humidity sensor 5 and connect.
Described resetting/testing circuit 47 contains reset key RESET, detects key TEST, capacitor C 7 and resistance R 23, and 43 of this circuit and singlechip chip D1 is connected with No. 34 pin.
Described powering on/testing circuit 48 contains triode N4, capacitor C 11, resistance R 12～R14, and this circuit is connected with heater circuit 44 with 29,30,40,42 pin of singlechip chip D1 respectively.
The principle of work of Fig. 3 is as follows: single-chip microcomputer D1 drives heater circuit 44 by the I/O mouth and alternately gas (CO) sensor is carried out the 5V/1V heating with specific interval, and the time interval of 5V and 1V is controlled by D1.Storer 46 is used to store given sensor and the needed various different parameters of software, and to eliminate the individual difference of different sensors characteristic, it transfers data to single-chip microcomputer D1 by the I/O mouth.The current environment voltage signal that gas sensitive device is gathered at the collection output signal and the temperature/humidity sensor 5 in the selected moment is transformed into digital signal via the A/D circuit of adorning in the single-chip microcomputer D1.Digitized signal, calculate through " interface " and software program P, carry out humiture and gas concentration correction, revised gas detecting element signal, compare with the gas concentration alarm limit of presetting on the one hand, if this signal surpasses this limit value, single-chip microcomputer D1 drives sound light alarming circuit 43 by the I/O mouth and carries out sound and light alarm, on the other hand, with the digitized signal of humiture, through interior dress display driver circuit 45, drive display screen, respectively displays temperature, humidity and gas concentration.
Fig. 6 is the workflow diagram of software program P.The gas sensor that domestic gas alarm of the present utility model adopts is to be operated in the 5V/1V state, 5V heating in promptly 60 seconds, 1V sampling in 30 seconds.Shown in accompanying drawing 4 waveforms, single-chip microcomputer D1 reads in inside with the output voltage of gas sensor at 1V/28 during second, and 12 functional blocks of roughly flowing through are carried out periodic duty.This flow process fundamental mode is described below:
Begin at first from power on or hand-reset begins, carry out the initialization setting of display driver among the D1 then, comprise the initial value of each register, driving frequency etc., and the display graphics of display screen is set; Each I/O mouth to D1 carries out the initialization setting, and each luminotron of back that guarantees to power on, hummer, heating voltage all have a definite state; Then carry out the setting of timer, be set to per 0.1 second system break once, carry out the timing of various timers after the interruption.Various parameters judgement system after setting completed powers on or hand-reset, if electrification reset is heating sensor half an hour then, display screen is shown as "------", under standard temperature humidity, read in the CO reference point, pilot-gas sensor heating voltage is that 5V continues 30 seconds, and pilot-gas sensor heating voltage is that 1V continues 28 seconds; D1 samples in the time of 28 seconds, and sampled data is handled, and shows by display screen.The sampling back judges that according to current concentration value alarm is early warning or reports to the police that last pilot-gas sensor heating voltage is 1V and continues 2 seconds.
Embodiment: family expenses CO numeral fuel gas alarm is by 2M003 type CO sensor, RHU-217-5AT type humiture head and MCU68HC705L1 form, by LCDs show " CO (ppm), T (℃), H (%RH) " and carry out CO sound and light alarm and the undesired demonstration of product work by 3 luminotrons (LED) and hummer.2 buttons are arranged: " resetting " and " check " key on the panel." check " key is used to check alarm whether can enter the Normal Alarm duty.The key that " resets " is used to make alarm to reset to the Normal Alarm duty.
Numeral carbon monoxide fuel gas alarm machine line is made up of 10 line units: power circuit 3, storer 93C46E
2PROM, MCU68HC705L1 single-chip microcomputer, RHU-217-5AT humiture head, power on/detection line 48, heat sample circuit 44, LCDs 6, play the timer effect crystal oscillating circuit 42, reset/checking circuit 47, sound light alarming circuit 43 etc.The elemental motion of entire circuit work is as follows:
1) power on:
Power circuit is by 7805 and 7806 direct supplys that two kinds of different voltages are provided respectively, + 5V voltage is for single-chip microcomputer D1, + 6V voltage is for heater circuit 44, rectification output+9.5V voltage uses for hummer, the PULSE HEATING voltage that cycle replaces, provide sequence control signal by 33 pin of single-chip microcomputer D1, through N as Fig. 4
6, N
72 grades of amplifications provide the desired 5V/1V power of CO sensor heating voltage.At this moment whole alarm is in the normal power-up state.N in the sound light alarming circuit 43
2Conducting, green light is bright.
2) preheating: before the GS2M003 operate as normal, need preheat a period of time, so design powers on/testing circuit 48 in the alarm circuit, when start powered up ,+5V passed through R
14Give C
11Charging, N
4Base voltage descends and ends, and 39 pins of D1 single-chip microcomputer are in low level, and follow procedure is set, half an hour preheating time.This moment, green light was glittering, showed to power up that promptly alarm is in preheat mode.Simultaneously, 27 pins of single-chip microcomputer D1 are in high level, N
3Conducting, amber light is bright.At this moment, LCDs 6 does not show CO concentration, Current Temperatures and humidity, and the state of LCDs 6 as shown in Figure 5.
As want to withdraw from preheat mode, can be by " resetting " key.And give low level signal of D1 single-chip microcomputer 43 pins, and become hand-reset by electrification reset, promptly software program is skipped preheating, directly enters program of following step, and after about 1 minute, amber light goes out, and alarm enters normal operating conditions.Display screen 6 shows CO concentration, temperature and humidity.Otherwise wait half an hour, just can enter normal operating conditions.Generally speaking, CO concentration shows " 0 ", and no CO leaks in the expression current environment.For guaranteeing the alarm operate as normal, set in the circuit when temperature exceeds 0～50 ℃, humidity and exceed 30～95%RH and GS2M003 and heat for the first time and be not 1V or disconnection, 27 pins of single-chip microcomputer D1 all are in high level, and amber light is bright, show that alarm is not in normal operating conditions.It is worthy of note that because each sensor performance is inconsistent, and its relative nature curve shape is similar, therefore, the special 93C46E that increases
2 PROM reservoir 46, in single-chip microcomputer D1, and the key point of the absolute value of decision sensor individual character is stored in 93C46 by on-line testing and input with the curve shape data storing.This is the 4th technical measures that adopt.The 5th technical measures are that the humiture head is separated with main frame.Because heater element is arranged in the casing, make interior humiture of its casing and current environment humiture inconsistent, and humiture also is not quite similar in each casing, for performing the temperature and humidity compensation of gas concentration, an effective way is, the humiture head is separated with main frame, and it is in the current environment, rather than in the casing of the current environment that has twisted, make the Temperature Humidity Sensor can really indicate current environment.
3) report to the police: when alarm is in the Normal Alarm duty, GS2M003 detects when CO leakage concentration is higher than 60ppm in the environment, and GS2M003 resistance reduces, and 38 pins of single-chip microcomputer D1 are in some low levels.Follow procedure is set, and D1 pin two 6 is given N
4Send a fluctuating signal, red light flashes, there is the CO gas that may have harm to human body in the prompting space, crossing specific delay time (according to the rules, different CO concentration, must behind some delay times, could report to the police), D1 pin two 5 can be exported a fluctuating signal, N1 conducting, hummer sounds, the D1 driver sends the digital display signal for LCD display 6 simultaneously, demonstrates CO concentration 60ppm on the LCDs 6, and presses current environment displays temperature and humidity, or CO concentration is during greater than 400ppm, without time-delay, D1 pin two 5 can be exported the signal of a pulsation, N1 conducting immediately, hummer is rung, the D1 driver sends the digital display signal for LCD display 6 simultaneously, shows H on the LCDs 6, and prompting has instant danger.Less than 60ppm, by signal sampling, software program P and circuit hardware, red light is gone out up to CO concentration, hummer stops shouting, and LCD display 6 shows low CO concentration, and alarm just stops to report to the police.
The utility model domestic gas alarm has following advantage: except that the sound and light alarm with common alarm, also have:
1. according to the different value of current environment CO concentration, carry out the demonstration of gas concentration numeral and carry out corresponding delayed alarm by ppm by LCDs 6.CO concentration degree of accuracy ± 30%.The relation of current environment CO concentration and warning delay time such as following table.
Table 2. warning delay time
| CO concentration X | Delay time |
| X(60ppm | Do not report to the police |
| 60ppm≤X＜100ppm | 60 minutes |
| 100ppm≤X＜200ppm | 30 minutes |
| 200ppm≤X＜300ppm | 10 minutes |
| 300ppm≤X＜ | 4 minutes |
| 400ppm＜X | Report to the police immediately |
2. according to current environmental temperature, to carry out temperature digital by LCDs 6 by a ℃ degree unit and show, degree of accuracy reaches ± and 1 ℃.
3. according to current environment humidity, carry out numeral by LCDs 6 by percentage relative humidity unit (%RH) and show degree of accuracy ± 8%RH.
The used main unit of the utility model device embodiment, device model, parameter are as follows:
Circuit symbol title specifications and models
D1 singlechip chip MCU68HC705L1
D2 storage chip 93C46
RS CO sensor MGS1100
The RH humidity sensor
RT temperature sensor 103AT-2B
LED1～LED3 light emitting diode
RC3 thermistor 51K Ω
N1～N4, N7 triode 7805
N5～N6 triode 7806
D3～D6 commutation diode
C1～C17 electric capacity
R1～R17 resistance
The BUZZER hummer
Claims (10)
1. a domestic gas alarm comprises housing, gas sensor (2), power circuit (3) and warning circuit (4); The input of gas sensor (2), output port connect power circuit (3) and warning circuit (4) respectively, it is characterized in that:
Also comprise temperature/humidity sensor (5) and display screen (6); Warning circuit (4) comprising: single-chip microcomputer (41), with the unidirectional crystal oscillating circuit that is connected of single-chip microcomputer (41) (42), sound light alarming circuit (43) and heater circuit (44), and with the two-way display driver circuit that is connected of single-chip microcomputer (41) (45), reservoir (46), reset/testing circuit (47) and power on/testing circuit (48); The output port of power circuit (3) connects single-chip microcomputer (41) and heater circuit (44) respectively, heater circuit (44) forms the closed-loop path with gas sensor (2), the signal output part of temperature/humidity sensor (5) connects a signal input part of single-chip microcomputer (41), display screen (6) and two-way connection of display driver circuit (45); Also be solidified with software program P in single-chip microcomputer (41) inside.
2. domestic gas alarm according to claim 1 is characterized in that: it is the integrated circuit (IC) chip D1 of MC68HC705L1 that described single-chip microcomputer (4) adopts model, and its inside is integrated with A/D translation circuit and display driver circuit (45).
3. domestic gas alarm according to claim 1 is characterized in that: it is the E of 93C46 that described storer (46) adopts model
2PROM storage chip D2, its 1～No. 4 pin is 22,21,20 and No. 19 pin of order sheet machine chip D1 respectively, and its No. 8 pin connect No. 23 pin of chip D1, insert 9～11,24 pin of chip D1 after 5, No. 6 pin parallel connections.
4. domestic gas alarm according to claim 1 is characterized in that: 51～62,1～6 of described display screen (6) and singlechip chip D1 is connected with No. 48 leg.
5. domestic gas alarm according to claim 1, it is characterized in that: described sound light alarming circuit (43) contains triode N1～N4, LED 1～LED3, hummer BUZZER, resistance R 1～R6, R10～R11, the base stage of triode N1～N4 is respectively through 25,28,27, No. 26 leg of resistance R 1, R3, R5, R10 order sheet machine chip D1, their collector meets hummer BUZZER, LED 1, LED2, LED3 through resistance R 2, R4, R6, R11 respectively, the whole ground connection of their emitter.
6. domestic gas alarm according to claim 1 is characterized in that: described heater circuit (44) contains triode N6～N7, capacitor C 10, C14, resistance R 15～R18, precision resistance RC2; The base stage of triode N7 is divided two-way, and one the tunnel connects 33 pin of chip D1 through resistance R 17, and another road connects gas sensor (2) through capacitor C 10, and two other terminals of described sensor (2) connect the emitter of triode N6 and 38 and 41 pin of chip D1 respectively.
7. domestic gas alarm according to claim 1 is characterized in that: described crystal oscillating circuit (42) comprises the closed-loop path of being made up of crystal oscillator XTAL, capacitor C 8～C9, resistance R 7, and its signal output part connects with 44,45 of singlechip chip D1 and is connected.
8. domestic gas alarm according to claim 1, it is characterized in that: No. 1 pin of described temperature/humidity sensor (5) connect chip D1 41 pin, power on/testing circuit (48) and heater circuit (44), No. 2 pin connect 35 and 33 pin of chip D1, No. 3 pin connect 29,30,40,42 pin of chip D1, No. 4 pin is divided into two branch roads, one the tunnel connects 36 pin of chip D1, and another road is through 2, No. 3 pin of resistance R C1 and temperature/humidity sensor (5) and connect.
9. domestic gas alarm according to claim 1 is characterized in that: described resetting/testing circuit (47) contained reset key RESET, detected key TEST, capacitor C 7 and resistance R 23, and 43 of this circuit and singlechip chip D1 is connected with No. 34 pin.
10. domestic gas alarm according to claim 1, it is characterized in that: described powering on/testing circuit (48) contained triode N4, capacitor C 11, resistance R 12～R14, and this circuit is connected with heater circuit (44) with 29,30,40,42 pin of singlechip chip D1 respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99251623 CN2397490Y (en) | 1999-10-26 | 1999-10-26 | Household gas alarm |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99251623 CN2397490Y (en) | 1999-10-26 | 1999-10-26 | Household gas alarm |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2397490Y true CN2397490Y (en) | 2000-09-20 |
Family
ID=34036021
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 99251623 Expired - Fee Related CN2397490Y (en) | 1999-10-26 | 1999-10-26 | Household gas alarm |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2397490Y (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102331266A (en) * | 2011-06-13 | 2012-01-25 | 无锡格林通安全装备有限公司 | Multi-parameter gas sensor compensating method |
| CN102509424A (en) * | 2012-01-05 | 2012-06-20 | 鲁东大学 | Gas cooker monitoring and warning system and realization method |
| CN103049984A (en) * | 2012-12-31 | 2013-04-17 | 常州大学 | Combustible gas alarm instrument based on Wireless HART communication technology |
| CN103714663A (en) * | 2013-11-26 | 2014-04-09 | 成都市容华电子有限公司 | Household gas concentration alarm device |
| CN111198531A (en) * | 2020-01-17 | 2020-05-26 | 刘睿妍 | Intelligent control system for power communication and working method thereof |
-
1999
- 1999-10-26 CN CN 99251623 patent/CN2397490Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102331266A (en) * | 2011-06-13 | 2012-01-25 | 无锡格林通安全装备有限公司 | Multi-parameter gas sensor compensating method |
| CN102509424A (en) * | 2012-01-05 | 2012-06-20 | 鲁东大学 | Gas cooker monitoring and warning system and realization method |
| CN103049984A (en) * | 2012-12-31 | 2013-04-17 | 常州大学 | Combustible gas alarm instrument based on Wireless HART communication technology |
| CN103714663A (en) * | 2013-11-26 | 2014-04-09 | 成都市容华电子有限公司 | Household gas concentration alarm device |
| CN111198531A (en) * | 2020-01-17 | 2020-05-26 | 刘睿妍 | Intelligent control system for power communication and working method thereof |
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| DD01 | Delivery of document by public notice |
Addressee: Dai Nengxiong Document name: Notice of termination |
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| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |