KR20170046471A - Gas alarm appratus using semiconductor gas sensor - Google Patents

Gas alarm appratus using semiconductor gas sensor Download PDF

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KR20170046471A
KR20170046471A KR1020150146863A KR20150146863A KR20170046471A KR 20170046471 A KR20170046471 A KR 20170046471A KR 1020150146863 A KR1020150146863 A KR 1020150146863A KR 20150146863 A KR20150146863 A KR 20150146863A KR 20170046471 A KR20170046471 A KR 20170046471A
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gas sensor
gas
heater
voltage
semiconductor type
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KR1020150146863A
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Korean (ko)
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KR101774229B1 (en
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강주현
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조인현
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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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
    • G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
    • G01N27/14—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of an electrically-heated body in dependence upon change of temperature
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
    • G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
    • G01R19/1659—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 to indicate that the value is within or outside a predetermined range of values (window)
    • 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
    • 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
    • G08B21/18—Status alarms
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B3/00—Audible signalling systems; Audible personal calling systems
    • G08B3/10—Audible signalling systems; Audible personal calling systems using electric transmission; using electromagnetic transmission

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Electromagnetism (AREA)
  • Investigating Or Analyzing Materials By The Use Of Fluid Adsorption Or Reactions (AREA)
  • Emergency Alarm Devices (AREA)

Abstract

In a gas warning apparatus using a semiconductor type gas sensor according to the present invention, a gas sensor unit (20) includes a semiconductor type gas sensor (21) in which a heater (H) is embedded and an insertion resistor (R2). The heater (H) and the insertion resistor (R2) are serially connected between a ground and a DC power source. Damage to the heater (H) is detected by monitoring a voltage of a node to which one end of the heater (H) and one end of the insertion resistor (R2) are connected. Accordingly, the present invention can easily detect a failure of the gas sensor.

Description

TECHNICAL FIELD [0001] The present invention relates to a gas alarm device using a semiconductor gas sensor,

The present invention relates to a gas alarm device using a semiconductor gas sensor as a sensor for gas detection, and also relates to a gas alarm device which is portable, has excellent detection accuracy and is resistant to environmental changes.

Recently, various kinds of gas alarm devices are installed in homes, factories, shopping malls, automobiles, ships, airplanes or camping sites. The gas alarm system detects and warns for volatile or flammable gas such as carbon monoxide, LPG, LNG, alcohol or benzene.

In the gas alarm system, gas sensors are a key part, and there are contact oxidation type, semiconductor type and electro chemical type. Due to the simple structure and excellent sensitivity, the use of semiconductor type gas sensors is increasing.

If the gas alarm system can not reliably detect the gas to be detected, the reliability of the alarm system becomes low and it can cause serious accidents. However, the gas sensor, which is a core part of the gas alarm system, may fail due to deterioration due to long-term use, defects in the manufacturing process inherent in the production, shock at the supply voltage or external physical shock, It is necessary to be able to detect such faults with a simple and complicated structure in a gas alarm system using a semiconductor type gas sensor which can detect immediately the occurrence of a failure and further emphasize portability or downsizing.

In addition, a gas alarm sometimes generates an erroneous gas detection signal even when there is no gas, or may not be able to detect gas even if the reference concentration is exceeded. Malfunctions may occur due to malfunctions in the process of turning on the power to the gas alarm system, environmental conditions such as temperature, humidity or wind speed change due to changes in seasons, day or night, There is a need to increase the detection level, reduce the possibility of malfunction, and tolerate environmental changes.

The recognition of the problems and problems of the prior art is not obvious to a person having ordinary skill in the art, so that the inventive step of the present invention should not be judged based on the recognition based on such recognition I will reveal.

Korean Patent Registration No. 10-0295314 (registered on Apr. 27, 2001)

An object of the present invention is to provide a gas alarm device using a semiconductor type gas sensor capable of detecting a failure of a gas sensor with a simple structure.

It is another object of the present invention to provide a gas alarm device using a semiconductor gas sensor with improved detection accuracy.

Another object of the present invention is to provide a gas alarm device using a semiconductor type gas sensor with improved resistance to environmental changes.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not restrictive of the invention, unless further departing from the spirit and scope of the invention as defined by the appended claims. It will be possible.

According to an aspect of the present invention, there is provided a gas warning device using a semiconductor type gas sensor, comprising: a semiconductor type gas sensor including a heater; And an insertion resistor,

The heater and the insertion resistor are connected in series between the DC power source and the ground and the breakdown of the heater is detected by monitoring the voltage of the node connected to one end of the heater and one end of the insertion resistance.

According to an aspect of the present invention, there is provided a gas warning device using a semiconductor type gas sensor, comprising: a semiconductor type gas sensor including a heater; Insertion resistance; And a positive voltage regulator having an input terminal connected to the DC power supply, an output terminal and a common terminal,

Wherein the heater and the insertion resistor are connected in series between an output terminal of the positive voltage regulator and the ground and a node to which one end of the heater and one end of the insertion resistance are connected is connected to a common terminal of the positive voltage regulator, And the breakage of the heater is detected by monitoring the voltage.

In the gas warning device using the semiconductor type gas sensor, a first input terminal is connected to the node for monitoring, a comparator for receiving a reference voltage at a second input terminal and comparing the voltage of the node with the reference voltage, ; ≪ / RTI >

The microcomputer may further include a microcontroller having a nonvolatile memory incorporated therein, wherein the microcontroller includes a microcomputer for generating a gas alarm based on a time at which power is supplied to the gas alarm device, Volatile memory periodically records a cumulative operating time of the apparatus, and outputs a signal for alarming when the cumulative operating time exceeds a set reference value.

In the gas alarm apparatus using the semiconductor type gas sensor, when the output voltage of the semiconductor type gas sensor changes below a predetermined speed, the semiconductor type gas sensor detects the gas in conjunction with the changing output voltage And the gas detection reference voltage to be a reference to be judged is adjusted.

In the gas alarm apparatus using the semiconductor type gas sensor, when the output voltage of the semiconductor type gas sensor changes beyond a predetermined speed, the gas detection reference voltage is not adjusted.

The gas warning device using the semiconductor type gas sensor further comprises a USB port, and is supplied with power through the USB port. A smart phone is connected to the USB port, and the semiconductor type gas sensor detects gas And transmits a message through the USB port so as to be alerted by using the speaker of the smartphone when it is determined to be detected.

According to an aspect of the present invention, there is provided a gas alarm apparatus using a semiconductor type gas sensor, which can easily detect a failure of the gas sensor by adding a insertion resistance and a comparator to the gas sensor unit, It is effective.

According to one aspect of the present invention, it is possible to prevent or reduce a false alarm and a gas detection alarm, and to reduce or eliminate a necessary lead time.

According to one aspect of the present invention, it is possible to improve the detection accuracy of the gas alarm device and prevent or reduce the malfunction by preventing the accuracy or the malfunction of the gas alarm device according to the environmental change by reflecting the environmental change at a comparatively slow speed There is an effect that the resistance to environmental change can be further improved.

1 is a block diagram showing a configuration of a gas alarm apparatus according to an embodiment of the present invention.
2 is a circuit diagram showing a peripheral circuit for the conventional semiconductor type gas sensor 21 together with the semiconductor type gas sensor 21. Fig.
3 is a circuit diagram showing a gas sensor unit 20 including a semiconductor gas sensor 21 according to the first embodiment of the present invention and peripheral circuits thereof.
4 is a circuit diagram showing a gas sensor unit 20 including a semiconductor gas sensor 21 according to a second embodiment of the present invention and a peripheral circuit thereof.
5 is a graph showing an example of the sensor resistance changing in the semiconductor type gas sensor according to temperature and humidity changes.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings in which: FIG. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention in the drawings, parts not related to the description are omitted, and similar names and reference numerals are used for similar parts throughout the specification.

1 is a block diagram showing a configuration of a gas alarm apparatus according to an embodiment of the present invention.

The gas alarm apparatus according to the embodiment of the present invention includes a micro controller 10, a gas sensor unit 20, an operation input unit 30, a display and alarm unit 40, a short range wireless communication unit 50, .

The microcontroller 10 controls the overall operation of the gas alarm system by means of the installed program, stores information, performs calculations and makes judgments. The microcontroller 10 includes an oscillator 12 and a nonvolatile memory 11. The oscillator 12 provides a clock function for the gas alarm device and the nonvolatile memory 11 stores programs and various information Perform non-volatile storage. In particular, the nonvolatile memory 11 of the microcontroller 10 stores various reference values, and can store the output voltage reference change rate, the gas detection reference voltage, the cumulative operating time, the heater breakdown reference voltage, Will be described later.

The gas sensor unit 20 includes a semiconductor type gas sensor and further includes additional circuitry for realizing the present invention in addition to the semiconductor type gas sensor, and details thereof will be described later. The semiconductor type gas sensor can detect at least two of carbon monoxide, LPG, LNG, alcohol, benzene and smoke, such as carbon monoxide sensor, LPG sensor, LNG sensor, alcohol sensor, benzene sensor and smoke sensor Or a composite sensor.

The operation input unit 30 may be one or more buttons for inputting operation commands for testing, resetting, calibrating, etc., as components for inputting a user's operation with the gas alarm device.

The display and alarm unit 40 may be a buzzer, a speaker, an LED, or the like for providing information and alarms to the user, and in particular, may be provided with operation state information of the gas alarm apparatus, gas detection alarm, And operation time-out alarm.

The short-range wireless communication unit 50 communicates with other gas alarm devices, a main device, or a smart phone in the form of RF, WiFi, Zigbee or Bluetooth to send and receive messages related to information, control commands, alarms or alarms.

The USB port 60 is supplied with power from an external USB charging adapter or a smart terminal such as a smart phone and is also connected to a smart phone or the like, Or alarms. For example, a micro-B type USB port is preferred. In particular, according to an embodiment of the present invention, when the semiconductor type gas sensor determines that gas is detected, it is used to transmit an alarm message through the USB port 60 so as to alert using a speaker of a smart phone.

2 is a circuit diagram showing a peripheral circuit for the conventional semiconductor type gas sensor 21 together with the semiconductor type gas sensor 21. Fig.

Semiconductor type gas sensor 21 and built-in heater (H) and the sensor resistor (R S), the heater (H) is applied to the power source voltage by always keeping the heat generating state for the gas sensor operation and the sensor resistor (R S) Lt; / RTI > Then, the resistance value of the sensor resistance depending on the contact of the gas to be sensed is read using the sensor voltage V S applied across the detection resistor R 1, and the sensor voltage V S exceeds the preset reference voltage It is assumed that the target gas is detected, and the user is alerted.

According to one embodiment of the present invention, by adding a simple circuit to such a conventional peripheral circuit, it is possible to detect and alarm the failure of the semiconductor gas sensor 21.

3 is a circuit diagram showing a gas sensor unit 20 including a semiconductor gas sensor 21 according to the first embodiment of the present invention and peripheral circuits thereof.

The semiconductor type gas sensor 21 includes a heater H and a sensor resistor R S and detects a sensor which varies depending on the contact of the gas to be detected by using a sensor voltage V S applied across the detection resistor R 1. The point of reading the resistance value of the resistor may be the same.

However, the gas sensor unit 20 according to an embodiment of the present invention further includes an insertion resistor R2 and a comparator 22. [

The heater H and the insertion resistor R2 of the gas sensor 21 are connected in series between the DC power source and the ground. According to the illustrated embodiment, the insertion resistance R2 is inserted between the heater H and the ground . Then, the breakdown of the heater H is detected by monitoring the voltage of the node N to which one end of the heater H and one end of the insertion resistor R1 are connected.

The comparator 22 is connected to the node N to monitor the voltage of the node N. The comparator 22 receives the reference voltage V REF at the second input terminal - (N) and a reference voltage (V REF ), generates an output signal (V C ) according to the comparison result, and provides the output signal (V C ) to the microcontroller (10).

The failure of the semiconductor type gas sensor 21 is mostly caused by the breakage of the heater H. In an embodiment of the present invention, the breakdown of the semiconductor type gas sensor 21 due to breakage of the heater is detected, Lt; / RTI >

The reference voltage V REF is a constant voltage used as a criterion for judging whether or not the heater is broken, and the voltage of the DC power supply can be used by dividing it. When the voltage of the DC power source is 5 V, the reference voltage (V REF ) may be set to 0.05 to 0.1 V, for example.

A process of alarming the failure of the gas sensor using the gas sensor unit 20 and the gas alarm device according to an embodiment of the present invention will be described.

The resistance value of the insertion resistor R2 and the reference voltage VREF are set such that the voltage of the node N always becomes equal to or larger than the sum of the reference voltage VREF and the margin margin when the heater of the gas sensor 21 is not damaged. V REF ) is set. Therefore, when the heater H of the gas sensor 21 is not broken, the voltage of the node N is always higher than the reference voltage V REF , so that the output voltage V C of the comparator 22 becomes 'HIGH' .

When the heater of the gas sensor 21 is broken, the voltage of the node N becomes the ground voltage and becomes smaller than the reference voltage V REF thus set. Therefore, the output voltage V C of the comparator 22 The microcontroller 10 receives the alarm signal and outputs a warning signal to the user of the gas sensor 21 by using the LED or buzzer of the display and alarm unit 40. [

The microcomputer 10 converts the voltage of the node N to digital by using an analog-to-digital converter in and / or out of the microcontroller 10 instead of the comparator 22 of the embodiment described above, M), it is possible to judge whether or not the gas sensor is broken due to heater breakage of the gas sensor 21.

According to the gas alarm apparatus using the semiconductor type gas sensor according to an aspect of the present invention, the effect of easily detecting the failure of the gas sensor is provided by a simple structure in which an insertion resistance and a comparator are added to the gas sensor unit or an insertion resistance is added have.

4 is a circuit diagram showing a gas sensor unit 20 including a semiconductor gas sensor 21 according to a second embodiment of the present invention and a peripheral circuit thereof.

The description of the same portions as those of the first embodiment will be omitted, and the following description will focus on the other portions.

The positive voltage regulator 23 has an input terminal I, an output terminal O and a common terminal COM. The input terminal I is connected to a direct current power source and is connected to an output terminal O ) And a common terminal COM at both ends thereof.

The heater H and the insertion resistor R2 of the gas sensor 21 are connected in series between the output terminal O of the positive voltage regulator 23 and the ground GND and connected to one end of the heater H and the insertion resistor R2 R2 is connected to the common terminal COM of the positive voltage regulator 23 and the output terminal O of the other positive voltage regulator 23 is connected to the sensor resistance of the gas sensor 21 (R S ) may be connected.

The gas sensor unit 20 according to the first embodiment described with reference to FIG. 3 can detect the temperature of the node N to which one end of the heater H and one end of the insertion resistor R2 are connected, The voltage of the inverter may be shaken to generate an erroneous fault signal. Further, in some cases, the heater (H) abnormally abnormally heats up at the initial stage of starting the gas alarm by turning on the power to the gas alarm, and accordingly, the gas alarm is erroneously detected as the gas is detected. Accordingly, Put lead time.

According to the gas sensor unit 20 according to the second embodiment, however, the voltage V of the node N to which one end of the heater H and one end of the insertion resistor R2 are connected in a state in which the heater H is not damaged So that the problem of generating an erroneous fault signal can be alleviated or solved. In addition, since the heater H is prevented from overheating at the initial stage of powering on the gas alarm device, it is possible to prevent an erroneous gas detection alarm, and the lead time during START may be unnecessary or shorter.

According to an aspect of the present invention, it is possible to prevent or reduce a false alarm and a gas detection alarm, and to reduce or eliminate the lead time required in START.

1, the microcontroller 10 periodically records the cumulative operating time of the gas alarm device in the nonvolatile memory 11 on the basis of the time during which power is supplied to the gas alarm device, and the cumulative operating time And outputs a signal for an alarm when the set reference value is exceeded.

Since the portable gas alarm device can intermittently supply power through the USB port 60 and can not know when the power supply is to be interrupted, the cumulative operation time is always updated periodically in the nonvolatile memory 11 . The time when the power supply is not performed is excluded from the cumulative operating time so that it is not reflected in the deterioration period of the gas sensor 21 and is reflected in the deterioration period based on the time when the power supply is performed. When the cumulative operating time exceeds a preset reference, the microcontroller 10 outputs a signal for an alarm to the LED of the display and alarm unit 40 so that the user can know.

On the other hand, in the conventional gas alarm system, there is a case where a gas detection signal is erroneous even though there is no gas at all, or gas detection can not be performed even when the reference concentration is exceeded. This is caused mainly by changes in environmental factors such as temperature, humidity or wind speed accompanying changes in seasons, day and night or installation place, and the operating conditions of the semiconductor type gas sensor are changed.

FIG. 5 is a graph (500 ppm methane gas), for example, to illustrate the sensor resistance varying in the semiconductor gas sensor according to temperature and humidity changes.

The reference resistance (R 0 ) is the sensor resistance at 20 ° C and 65% humidity. As shown, the ratio (R S / R 0 ) of the sensor resistance to the reference resistance , It can be seen that there is a large difference in the value of the sensor resistance (R S ) even at the same gas concentration (500 ppm methane) depending on temperature and humidity.

In order to detect the gas, the sensor voltage V S applied to both ends of the detection resistor R1 is used. When the sensor voltage V S exceeds the gas detection reference voltage which is a preset reference voltage, And alarms the user. The gas detection reference voltage is a reference voltage at which the semiconductor type gas sensor determines that the gas is detected.

According to one embodiment of the present invention, the microcontroller 10 dynamically adjusts the gas detection reference voltage during operation of the gas alarm system.

The gas detection reference voltage is adjusted on the basis of the rate of change of the sensor voltage (V S ), which is the output voltage of the semiconductor type gas sensor, so that the output voltage of the semiconductor type gas sensor changes below the output voltage reference change rate The gas detection reference voltage is not adjusted when the output voltage of the semiconductor type gas sensor changes beyond the set output voltage reference change speed. In this case, however, There is a high probability that it is judged as gas detection and leads to a gas detection alarm.

The output voltage of the semiconductor type gas sensor is monitored when the output voltage of the semiconductor type gas sensor changes below the set output voltage reference change speed. The new gas detection reference voltage is a voltage having a constant interval with the changed output voltage Or a value obtained by adding the variation amount of the output voltage to the previous gas detection reference voltage or a value obtained by adding a certain percentage of the variation amount of the output voltage to the previous gas detection reference voltage, And may be a voltage calculated by a predetermined calculation formula.

The rate of change of the output voltage can be calculated by various methods such as the amount of change of the output voltage per unit time. For example, when the output voltage rises below the output voltage reference change speed, the gas detection reference voltage also rises. The output voltage reference conversion speed is a value stored in the nonvolatile memory M of the microcontroller 10 as a change speed of the reference output voltage used for determining whether to adjust the gas detection reference voltage.

According to one aspect of the present invention, it is possible to improve the detection accuracy of the gas alarm device and prevent or reduce the malfunction by preventing the accuracy or the malfunction of the gas alarm device according to the environmental change by reflecting the environmental change at a comparatively slow speed There is an effect that the resistance to environmental change can be further improved.

10: Micro controller 20: Gas sensor unit
30: Operation input unit 40: Display and alarm unit
50: Local area wireless communication unit 60: USB port

Claims (7)

A semiconductor type gas sensor incorporating a heater; And
And an insertion resistor,
The heater and the insertion resistor are connected in series between the DC power source and the ground,
And detecting a breakdown of the heater by monitoring a voltage of a node to which one end of the heater and one end of the insertion resistance are connected,
Wherein the gas sensor is a gas sensor. A semiconductor type gas sensor incorporating a heater;
Insertion resistance; And
And a positive voltage regulator having an input terminal connected to the DC power supply, an output terminal and a common terminal,
The heater and the insertion resistor are connected in series between the output terminal of the positive voltage regulator and the ground,
Wherein a node to which one end of the heater and one end of the insertion resistor are connected is connected to a common terminal of the positive voltage regulator and detects breakage of the heater by monitoring a voltage of the node,
Wherein the gas sensor is a gas sensor. The method according to claim 1 or 2,
A comparator for connecting the first input terminal to the node and the reference voltage to the second input terminal for the monitoring and comparing the voltage of the node with the reference voltage;
Further comprising a sensor for detecting the presence of the gas. The method according to claim 1 or 2,
And a microcontroller in which a nonvolatile memory is incorporated,
The microcontroller includes:
Wherein the control unit periodically records the cumulative operating time of the gas alarm device in the nonvolatile memory based on a time when power is supplied to the gas alarm device, and outputs a signal for an alarm when the cumulative operating time exceeds a set reference value,
Wherein the gas sensor is a gas sensor. The method according to claim 1 or 2,
Wherein when the output voltage of the semiconductor type gas sensor changes below the set speed,
The gas detection reference voltage being a reference for determining that the semiconductor type gas sensor detects gas in conjunction with the varying output voltage,
Wherein the gas sensor is a gas sensor. The method of claim 5,
When the output voltage of the semiconductor type gas sensor changes beyond the set speed,
Wherein the gas detection reference voltage is not adjusted,
Wherein the gas sensor is a gas sensor. The method according to claim 1 or 2,
And a USB port;
When the smartphone is connected to the USB port and the semiconductor type gas sensor detects that the gas is detected, the USB port is connected to the USB port so as to be alerted by using the speaker of the smart phone, Sending a message through,
Wherein the gas sensor is a gas sensor.

KR1020150146863A 2015-10-21 2015-10-21 Gas alarm appratus using semiconductor gas sensor KR101774229B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20220114811A (en) * 2021-02-09 2022-08-17 주식회사 지에버 Fixed type device for gas measurement using semiconductor gas sensor

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001264141A (en) * 2000-03-23 2001-09-26 Matsushita Electric Ind Co Ltd Gas safety device
JP4668805B2 (en) * 2006-02-17 2011-04-13 矢崎総業株式会社 Gas sensor heater failure detection device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20220114811A (en) * 2021-02-09 2022-08-17 주식회사 지에버 Fixed type device for gas measurement using semiconductor gas sensor

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