CN105719436B - A kind of intelligent mobile terminal and its pernicious gas detect based reminding method - Google Patents
A kind of intelligent mobile terminal and its pernicious gas detect based reminding method Download PDFInfo
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- CN105719436B CN105719436B CN201610270449.9A CN201610270449A CN105719436B CN 105719436 B CN105719436 B CN 105719436B CN 201610270449 A CN201610270449 A CN 201610270449A CN 105719436 B CN105719436 B CN 105719436B
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
- G08B21/02—Alarms for ensuring the safety of persons
- G08B21/12—Alarms for ensuring the safety of persons responsive to undesired emission of substances, e.g. pollution alarms
- G08B21/14—Toxic gas alarms
Abstract
The invention discloses a kind of intelligent mobile terminals and its pernicious gas to detect based reminding method, and intelligent mobile terminal includes control module, detection module and alarm module.The control module exports the adjustment signal in different grades of period sequentially to control the working condition of detection module；Detection module detects whether have corresponding default pernicious gas in air under different working conditions, and output test result is to control module；Control module controls the alarm condition of alarm module according to testing result.The detection of different pernicious gases is controlled a detection module, achieved that by different grades of adjustment signal in this way, no setting is required multiple detection modules save cost and occupied space is less；It can also alarm when detecting pernicious gas user, so that windowing ventilation may be selected or far from pernicious gas in user.
Description
Technical field
The present invention relates to gas detection technology field, in particular to a kind of intelligent mobile terminal and its pernicious gas detection mention
Awake method.
Background technique
In the decades history of industrial development, air quality is worse and worse.It is various with the development of intelligent mobile terminal
Sensor on intelligent terminal using more and more common.Relevant gas sensing is integrated on the intelligent terminal having at present
Device detects pernicious gas and alarm in air by gas sensor.But since pernicious gas type is more, if desired
A variety of pernicious gases are detected simultaneously, the gas sensor for being correspondingly arranged multiple types is generally required, more sky can be occupied in this way
Between, increase cost.
In view of this, the present invention provides a kind of intelligent mobile terminal and its pernicious gas detection based reminding method.
Summary of the invention
Place in view of above-mentioned deficiencies of the prior art, the purpose of the present invention is to provide a kind of intelligent mobile terminal and its has
Evil gas detection based reminding method leads to occupied space to solve the gas sensor that multiple types need to be arranged in existing intelligent terminal
It is more, increase cost the problem of.
In order to achieve the above object, this invention takes following technical schemes:
It is a kind of for detect remind pernicious gas intelligent mobile terminal comprising control module, detection module and alarm
Module；
The control module exports the adjustment signal in different grades of period sequentially to control the working condition of detection module；
Detection module detects whether have corresponding default pernicious gas in air under different working conditions, and output test result is given
Control module；Control module exports the alarm condition of corresponding control signal control alarm module according to testing result.
In the described intelligent mobile terminal for detect prompting pernicious gas, the control module include MCU, crystal oscillator,
First capacitor and the second capacitor；
The P0.01 foot of the MCU, P0.02 foot, P0.03 foot, P0.29 foot connecting detection module, the P0.05 foot of MCU,
P0.15 foot, P0.25 foot, P0.26 foot connect alarm module；The input pin of the XC2 foot connection crystal oscillator of MCU also passes through first capacitor
Ground connection；The XC1 foot of the output pin connection MCU of crystal oscillator also passes through the second capacity earth；The VDD foot and AVDD foot of MCU is all connected with
One feeder ear.
In the intelligent mobile terminal for detecting prompting pernicious gas, the detection module includes operation amplifier
Device, gas sensor, filter circuit, first resistor and second resistance；
The P0.01 foot of the OUTPUT foot connection MCU of the operational amplifier and one end of first resistor, operational amplifier
NII foot connects the output end of filter circuit, the P0.29 foot of the input terminal connection MCU of filter circuit, the VCC foot of operational amplifier
The first feeder ear, the VDD/GND foot ground connection of operational amplifier are connected, the II foot of operational amplifier connects one end of first resistor,
The H1 foot of the other end connection gas sensor of first resistor and the P0.02 foot of MCU；The S1 foot connection MCU's of gas sensor
P0.03 foot also passes through second resistance the first feeder ear of connection；The S2 foot and H2 foot of gas sensor are grounded.
In the intelligent mobile terminal for detecting prompting pernicious gas, the alarm module includes:
Quarter-bell unit, the first control signal for being exported according to control module carry out sounding alarm；
Light unit, the second control signal for being exported according to control module carry out luminous alarm；
Vibration unit, the third control signal for being exported according to control module carry out vibration alarming.
In the intelligent mobile terminal for detecting prompting pernicious gas, the quarter-bell unit includes loudspeaker, the 5th
Resistance and the 6th resistance；
The P0.25 foot of one end connection MCU of the loudspeaker also passes through the 5th resistance eutral grounding；The other end of loudspeaker connects MCU
P0.26 foot, also pass through the 6th resistance eutral grounding.
In the described intelligent mobile terminal for detect prompting pernicious gas, the light unit include light emitting diode,
First metal-oxide-semiconductor and the 7th resistance；
The cathode of the light emitting diode connects the second feeder ear, the leakage of anode the first metal-oxide-semiconductor of connection of light emitting diode
Pole, the P0.15 foot of the grid connection MCU of the first metal-oxide-semiconductor and one end of the 7th resistance, the 7th electricity of source electrode connection of the first metal-oxide-semiconductor
The other end and ground of resistance.
In the intelligent mobile terminal for detecting prompting pernicious gas, the vibration unit includes motor, second
Diode, the second metal-oxide-semiconductor and the 8th resistance；
The cathode of anode connection the second feeder ear and the second diode of the motor, the cathode of motor connect the two or two pole
The anode of pipe and the drain electrode of the second metal-oxide-semiconductor, the P0.05 foot of the grid connection MCU of the second metal-oxide-semiconductor and one end of the 8th resistance, the
The source electrode of two metal-oxide-semiconductors connects the other end and ground of the 8th resistance.
In the intelligent mobile terminal for detecting prompting pernicious gas, the gas sensor is metal oxide
Semiconductor transducer, model ENS130.
In the intelligent mobile terminal for detecting prompting pernicious gas, the duty ratio of different grades of adjustment signal
Difference, and the corresponding duty ratio of each grade continues the identical time；By the sequence of duty ratio from small to large or from big to small
Output.
A kind of pernicious gas detection based reminding method using the intelligent mobile terminal characterized by comprising
A, control module exports the adjustment signal in different grades of period sequentially to control the working condition of detection module；
B, detection module detects whether have corresponding default pernicious gas in air under different working conditions, and exports
Testing result is to control module；
C, control module exports the alarm condition of corresponding control signal control alarm module according to testing result.
Compared to the prior art, the intelligent mobile terminal of pernicious gas provided by the invention and its pernicious gas detection are reminded
Method exports the adjustment signal in different grades of period sequentially by control module to control the working condition of detection module；Inspection
Survey module detects whether have corresponding default pernicious gas in air under different working conditions, and output test result is to control
Molding block；Control module controls the alarm condition of alarm module according to testing result.Pass through different grades of adjustment signal in this way
One detection module is controlled, is achieved that the detection of different pernicious gases, no setting is required multiple detection modules save
Cost and occupied space is less；It can also alarm when detecting pernicious gas user, lead to so that windowing may be selected in user
Wind or separate pernicious gas.
Detailed description of the invention
Fig. 1 is the structural block diagram of intelligent mobile terminal provided by the invention.
Fig. 2 is the circuit diagram of control module in intelligent mobile terminal provided by the invention.
Fig. 3 is the circuit diagram of detection module in intelligent mobile terminal provided by the invention.
Fig. 4 is the equivalent circuit diagram of gas sensor interior in intelligent mobile terminal provided by the invention.
Fig. 5 is the circuit diagram of quarter-bell unit in intelligent mobile terminal provided by the invention.
Fig. 6 is the circuit diagram of light unit in intelligent mobile terminal provided by the invention.
Fig. 7 is the circuit diagram of vibration unit in intelligent mobile terminal provided by the invention.
Fig. 8 is that the pernicious gas of intelligent mobile terminal provided by the invention detects based reminding method flow chart.
Specific embodiment
The present invention provides a kind of intelligent mobile terminal and its pernicious gas detection based reminding method, passes through a gas sensor
Different types of pernicious gas can be detected, and prompt user when detecting pernicious gas.To make mesh of the invention
, technical solution and effect it is clearer, clear, the present invention is described in more detail as follows in conjunction with drawings and embodiments.
It should be appreciated that described herein, specific examples are only used to explain the present invention, is not intended to limit the present invention.
Referring to Fig. 1, intelligent mobile terminal provided by the invention includes control module 100, detection module 200 and alarm
Module 300.The control module 100 exports the adjustment signal in different grades of period sequentially to control the work of detection module 200
Make state；Detection module 200 detects whether have corresponding default pernicious gas in air under different working conditions, and defeated
Testing result is to control module 100 out；Control module 100 exports corresponding control signal control alarm module according to testing result
300 alarm condition.
It include MCU U1, crystal oscillator Y, first capacitor C1 and the second capacitor C2 also referring to Fig. 1, the control module 100；
The P0.01 foot of the MCU U1, P0.02 foot, P0.03 foot, P0.29 foot connecting detection module 200, the P0.05 foot of MCU U1,
P0.15 foot, P0.25 foot, P0.26 foot connect alarm module 300；The input pin IN of the XC2 foot connection crystal oscillator Y of MCU U1, also lead to
Cross first capacitor C1 ground connection；The XC1 foot of the output pin OUT connection MCU U1 of crystal oscillator Y also passes through the second capacitor C2 ground connection；MCU
The VDD foot and AVDD foot of U1 is all connected with the first feeder ear VDD_3V3.
Wherein, the model NRF51822 of the MCU U1.Crystal oscillator Y, first capacitor C1 and the second capacitor C2 form MCU
The clock circuit of U1 provides clock signal for MCU U1.The P0.29 foot of MCU U1 is the output pin of adjustment signal PWM；P0.01
Foot and P0.02 foot are sampling foot, for carrying out ADC sampling to adjustment signal PWM；The inspection of P0.03 foot input detection module 200
Survey result；P0.05 foot, P0.15 foot, P0.25 foot, P0.26 foot export control signal to alarm module 300, it is different to realize
Type of alarm.
After the MCU U1 is powered on, can according to the program finished in advance inside it, by duty ratio from small to large or from greatly to
Small sequence exports one section of different grades of adjustment signal PWM from P0.29 foot.The duty ratio of different grades of adjustment signal PWM
Difference, and the corresponding duty ratio of each grade continues the identical time.After adjustment signal PWM is detected the identification of module 200,
Detection module 200 can be controlled according to corresponding grade be switched to corresponding working condition.In the specific implementation, the MCU
U1 automatic starting detection function, direct output adjustment signal PWM after can powering on.Can also according to user's operation (such as press it is default by
Key or icon) enabling signal that generates starts detection function, and enabling signal can input from the P0.30 foot of MCU U1.
It is to be appreciated that corresponding key and icon can be used directly key, icon on intelligent mobile terminal, and with
Power circuit is connected with work once electrified.The intelligent mobile terminal can also be separately configured to one and not have setting for telephonic communication function
It is standby, then it needs to increase corresponding power supply circuit, power supply circuit is the prior art, is not described further herein.
Also referring to Fig. 3, the detection module 200 includes operational amplifier U2, gas sensor U3, filter circuit
210, first resistor R1 and second resistance R2；The P0.01 foot and the of the OUTPUT foot connection MCU U1 of the operational amplifier U2
One end of one resistance R1, the output end of the NII foot connection filter circuit 210 of operational amplifier U2, the input terminal of filter circuit 210
The P0.29 foot of MCU U1 is connected, the VCC foot of operational amplifier U2 connects the first feeder ear VDD_3V3, operational amplifier U2's
VDD/GND foot ground connection, one end of the II foot connection first resistor R1 of operational amplifier U2, the other end of first resistor R1 connect gas
The H1 foot of body sensor U3 and the P0.02 foot of MCU U1；The P0.03 foot of the S1 foot connection MCU U1 of gas sensor U3 also leads to
Cross second resistance R2 the first feeder ear of connection VDD_3V3；The S2 foot and H2 foot of gas sensor U3 is grounded.
Wherein, first resistor R1 is current-limiting resistance, its resistance value size is adjusted as needed.The filter circuit 210 wraps
Include 3rd resistor R3, the 4th resistance R4, third capacitor C3 and the 4th capacitor C4；One end (i.e. filtered electrical of the 3rd resistor R3
The input terminal on road 210) connection MCU U1 P0.29 foot；The other end of 3rd resistor R3 connects one end of the 4th resistance R4, also leads to
Cross third capacitor C3 ground connection；The other end (i.e. the output end of filter circuit 210) the connection operational amplifier U2's of 4th resistance R4
NII foot also passes through the 4th capacitor C4 ground connection.3rd resistor R3 and third capacitor C3 forms a low-pass filter, the 4th resistance
R4 and the 4th capacitor C4 forms other end low-pass filter.
In the present embodiment, the model ENS130 of the gas sensor U3 is a kind of metal-oxide semiconductor (MOS) sensing
Device, its working principle is that: using the suction-operated of tested gas, change the conductivity of its semiconductor, inhales shield when gas with various and exist
When this sensor, conductivity semiconductor is different, and under certain temperature adjusting, gas with various inhales shield on an metal oxide
When, conductivity difference is obvious.The inside equivalent circuit of ENS130 is the equivalent circuit of ENS130 as follows as shown in Figure 4, altogether
There are 4 pin feet, the both ends that H1 foot and H2 foot are resistance Rh, are associated drive circuitry, it is therefore an objective to reach the power of resistance Rh
After certain value, the temperature generated on resistance Rh makes resistance Rs work under the conditions of certain temperature.S1 foot and S2 foot are material gold
The both ends for belonging to the resistance Rs of oxide, when gas with various gas(es) inhales shield above, the conductivity of resistance Rs changes, resistance
Value changes.
In schematic diagram, RS and R9 are connected on VCC, and RS resistance value is different, and the partial pressure on RS is different, the voltage of S_ADC
Difference distinguishes different gas；RH and R8 are connected in series to the output of U9, and the output of U9 provides power source for RH, the signal of PWM,
The power caning be controlled on RH can be controlled in the temperature generated on RH.
Adjustment signal PWM is input to the reverse input end of operational amplifier U2 after 210 low-pass filtering of filter circuit
(NII foot).Operational amplifier U2 amplifies adjustment signal PWM, using being output to gas sensor after first resistor R1 current limliting
In U3.U_ADC signal and H_ADC signal are the ADC sampled signals of MCU, are respectively intended to the output letter of detection calculations amplifier U2
Number and gas sensor U3 input signal.When MCU exports different adjustment signal PWM, gas sensor U3 is received
Corresponding different grades of input signal makes the S1 foot of gas sensor U3 export different feedback signal S_ADC(and detects knot
Fruit).Second resistance R2 plays the role of partial pressure.MCU detects the voltage value of feedback signal S_ADC, that is, may recognize that current inspection
Which kind of gas measured.Such as: when feedback signal S_ADC is 0.7V, corresponding CO(carbon monoxide)；Feedback signal S_ADC is 0.9V
When, corresponding CO2(carbon dioxide)；When feedback signal S_ADC is 1V, corresponding formaldehyde etc., specific corresponding relationship can be set according to software
It is fixed.
After MCU identifies pernicious gas, corresponding control signal is exported to alarm module 300, to be alarmed accordingly.
Also referring to Fig. 5-Fig. 7, use three kinds of type of alarms in the present embodiment, the alarm module 300 include quarter-bell unit 310,
Light unit 320 and vibration unit 330.The quarter-bell unit 310 is sent out according to the first control signal that control module 100 exports
Acoustic alarm.Light unit 320 carries out luminous alarm according to the second control signal that control module 100 exports.330 basis of vibration unit
The third control signal that control module 100 exports carries out vibration alarming.
Wherein, the quarter-bell unit 310 includes loudspeaker S, the 5th resistance R5 and the 6th resistance R6；One end of the loudspeaker S
Connect the P0.25 foot of MCU, also by the 5th resistance R5 ground connection；The P0.26 foot of the other end connection MCU of loudspeaker S, also by the
Six resistance R6 ground connection.Wherein, the 5th resistance R5 and the 6th resistance R6 is varistor, is used as ESD(Electro-Static
Discharge, electrostatic protection).First control signal ADC ± driving loudspeaker S the sounding of MCU output.
The light unit 320 includes light emitting diode D1, the first metal-oxide-semiconductor Q1 and the 7th resistance R7；The light emitting diode
The cathode of D1 connects the second feeder ear VDD_2V8, the drain electrode of the first metal-oxide-semiconductor Q1 of anode connection of light emitting diode D1, the first MOS
The P0.15 foot of the grid connection MCU of pipe Q1 and one end of the 7th resistance R7, the source electrode of the first metal-oxide-semiconductor Q1 connect the 7th resistance R7
The other end and ground.First metal-oxide-semiconductor Q1 is NMOS tube.When the second control signal LED of MCU output is high level, control first
Metal-oxide-semiconductor Q1 conducting lights light emitting diode D1；The first metal-oxide-semiconductor Q1 cut-off extinguishes light emitting diode D1 when for low level.
The vibration unit 330 includes motor M, the second diode D2, the second metal-oxide-semiconductor Q2 and the 8th resistance R8；The horse
Up to the cathode of anode connection the second feeder ear VDD_2V8 and the second diode D2 of M, the cathode of motor M connects the second diode
D2 anode and the second metal-oxide-semiconductor Q2 drain electrode, the second metal-oxide-semiconductor Q2 grid connection MCU P0.05 foot and the 8th resistance R8 one
End, the source electrode of the second metal-oxide-semiconductor Q2 connect the other end and ground of the 8th resistance R8.Second metal-oxide-semiconductor Q2 is NMOS tube.MCU output
When third control signal MOTOR is high level, control the second metal-oxide-semiconductor Q2 conducting vibrates motor M；2nd MOS when for low level
Pipe Q2 cut-off keeps motor M static.
Based on above-mentioned intelligent mobile terminal, the present invention also provides a kind of detections of the pernicious gas of intelligent mobile terminal to remind
Method, as shown in figure 8, pernicious gas detection based reminding method includes:
S100, control module export the adjustment signal in different grades of period sequentially to control the work shape of detection module
State；
Whether S200, detection module detect under different working conditions corresponding default pernicious gas in air, and
Output test result is to control module；
S300, control module export the alarm condition of corresponding control signal control alarm module according to testing result.Tool
Body refers to the working principle of above-described embodiment.
In conclusion intelligent mobile terminal provided by the invention and its pernicious gas detect based reminding method, pass through setting one
A gas sensor switches the working condition of gas sensor according to different grades of adjustment signal, and difference, which can be realized, to be had
The detection of evil gas, no setting is required multiple sensors save cost and occupied space are less；It can also detect pernicious gas
When jingle bell is carried out to user, is shone or vibration alarming, so that windowing ventilation may be selected in user, opens air purifier or far from having
Evil gas.
It, can according to the technique and scheme of the present invention and its hair it is understood that for those of ordinary skills
Bright design is subject to equivalent substitution or change, and all these changes or replacement all should belong to the guarantor of appended claims of the invention
Protect range.
Claims (9)
1. a kind of for detecting the intelligent mobile terminal for reminding pernicious gas, which is characterized in that including control module, detection module
And alarm module；
The control module exports the adjustment signal in different grades of period sequentially to control the working condition of detection module；Detection
Whether module detects under different working conditions corresponding default pernicious gas in air, and output test result is to control
Module；Control module exports the alarm condition of corresponding control signal control alarm module according to testing result；
The duty ratio of different grades of adjustment signal is different, and the corresponding duty ratio of each grade continues the identical time；It presses
The Sequential output of duty ratio from small to large or from big to small；Gas sensor built in detection module receives corresponding different brackets
Input signal, export different feedback signals；Detect the gas that the voltage value identification current detection of feedback signal goes out.
2. according to claim 1 for detecting the intelligent mobile terminal for reminding pernicious gas, which is characterized in that the control
Molding block includes MCU, crystal oscillator, first capacitor and the second capacitor；
The P0.01 foot of the MCU, P0.02 foot, P0.03 foot, P0.29 foot connecting detection module, P0.05 foot, the P0.15 of MCU
Foot, P0.25 foot, P0.26 foot connect alarm module；The input pin of the XC2 foot connection crystal oscillator of MCU also passes through first capacitor ground connection；
The XC1 foot of the output pin connection MCU of crystal oscillator also passes through the second capacity earth；The VDD foot and AVDD foot of MCU is all connected with the first confession
Electric end.
3. according to claim 2 for detecting the intelligent mobile terminal for reminding pernicious gas, which is characterized in that the inspection
Surveying module includes operational amplifier, gas sensor, filter circuit, first resistor and second resistance；
The P0.01 foot of the OUTPUT foot connection MCU of the operational amplifier and one end of first resistor, the NII of operational amplifier
Foot connects the output end of filter circuit, the P0.29 foot of the input terminal connection MCU of filter circuit, the VCC foot connection of operational amplifier
First feeder ear, the VDD/GND foot ground connection of operational amplifier, one end of the II foot connection first resistor of operational amplifier, first
The H1 foot of the other end connection gas sensor of resistance and the P0.02 foot of MCU；The P0.03 of the S1 foot connection MCU of gas sensor
Foot also passes through second resistance the first feeder ear of connection；The S2 foot and H2 foot of gas sensor are grounded.
4. according to claim 2 for detecting the intelligent mobile terminal for reminding pernicious gas, which is characterized in that the report
Warning module includes:
Quarter-bell unit, the first control signal for being exported according to control module carry out sounding alarm；
Light unit, the second control signal for being exported according to control module carry out luminous alarm；
Vibration unit, the third control signal for being exported according to control module carry out vibration alarming.
5. according to claim 4 for detecting the intelligent mobile terminal for reminding pernicious gas, which is characterized in that described noisy
Bell unit includes loudspeaker, the 5th resistance and the 6th resistance；
The P0.25 foot of one end connection MCU of the loudspeaker also passes through the 5th resistance eutral grounding；The other end connection MCU's of loudspeaker
P0.26 foot also passes through the 6th resistance eutral grounding.
6. according to claim 4 for detecting the intelligent mobile terminal for reminding pernicious gas, which is characterized in that the light
Unit includes light emitting diode, the first metal-oxide-semiconductor and the 7th resistance；
The cathode of the light emitting diode connects the second feeder ear, and the anode of light emitting diode connects the drain electrode of the first metal-oxide-semiconductor, the
The P0.15 foot of the grid connection MCU of one metal-oxide-semiconductor and one end of the 7th resistance, the source electrode of the first metal-oxide-semiconductor connect the another of the 7th resistance
One end and ground.
7. according to claim 4 for detecting the intelligent mobile terminal for reminding pernicious gas, which is characterized in that the vibration
Moving cell includes motor, the second diode, the second metal-oxide-semiconductor and the 8th resistance；
The cathode of anode connection the second feeder ear and the second diode of the motor, the cathode of motor connect the second diode
The drain electrode of anode and the second metal-oxide-semiconductor, the P0.05 foot of the grid connection MCU of the second metal-oxide-semiconductor and one end of the 8th resistance, the 2nd MOS
The source electrode of pipe connects the other end and ground of the 8th resistance.
8. according to claim 3 for detecting the intelligent mobile terminal for reminding pernicious gas, which is characterized in that the gas
Body sensor is metal oxide semiconductor sensor, model ENS130.
9. a kind of pernicious gas using the described in any item intelligent mobile terminals of claim 1-8 detects based reminding method, special
Sign is, comprising:
A, control module exports the adjustment signal in different grades of period sequentially to control the working condition of detection module；
B, detection module detects whether have corresponding default pernicious gas in air under different working conditions, and exports detection
As a result control module is given；
C, control module exports the alarm condition of corresponding control signal control alarm module according to testing result.
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| CN106931972B (en) * | 2017-03-07 | 2020-04-24 | 信利光电股份有限公司 | Method and system for reminding escape direction of dangerous environment personnel |
| CN111157685A (en) * | 2020-01-17 | 2020-05-15 | 苏州仁甬得物联科技有限公司 | Self-adaptive PWM energy-saving alarm system for gas treatment |
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| CN1136448C (en) * | 1999-12-17 | 2004-01-28 | 中国科学院合肥智能机械研究所 | Toxic gas selective alarm device |
| DE102006047860A1 (en) * | 2006-10-10 | 2008-04-17 | Daimler Ag | Abnormal condition e.g. overcharging, monitoring device for vehicle component e.g. battery, has gas sensor to measure concentration of gases, and computing unit to detect exceeding of values for gases, and warning unit to deliver alarm |
| CN203070498U (en) * | 2013-02-06 | 2013-07-17 | 陕西理工学院 | Distributed combustion gas leakage monitoring alarm system |
| CN104240449A (en) * | 2014-09-18 | 2014-12-24 | 天津市浦海新技术有限公司 | Detection alarm |
| CN204695509U (en) * | 2015-06-16 | 2015-10-07 | 四川分享微联科技有限公司 | A kind of wrist with peculiar smell measuring ability wears custodial care facility |
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