CN106596836B - Device and method for preventing catalytic combustion sensor from being poisoned - Google Patents
Device and method for preventing catalytic combustion sensor from being poisoned Download PDFInfo
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- CN106596836B CN106596836B CN201710050278.3A CN201710050278A CN106596836B CN 106596836 B CN106596836 B CN 106596836B CN 201710050278 A CN201710050278 A CN 201710050278A CN 106596836 B CN106596836 B CN 106596836B
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Abstract
The invention belongs to the technical field of combustible gas detection equipment, and particularly relates to a device and a method for preventing a catalytic combustion sensor from being poisoned, wherein the device comprises: the catalytic combustion sensor and the signal processing circuit, the sensor is transmitted the signal of gathering for signal processing circuit and is handled, still includes singlechip and control circuit, and the singlechip is connected with control circuit, and control circuit is connected with the catalytic combustion sensor, and the catalytic combustion sensor is connected with signal processing circuit, and signal processing circuit feeds back the signal feedback of catalytic combustion sensor to the singlechip. The invention realizes the activation mode of the sensor through the singlechip control circuit, and feeds back the singlechip through the signal processing circuit to monitor the state of the sensor in real time; the poisoning prevention and activation of the sensor are realized in a mode of generating short-time large current through short circuit; the detection resistor and the compensation resistor of the sensor are respectively short-circuited by controlling the MOS tube, so that the catalytic combustion sensor is activated.
Description
Technical Field
The invention belongs to the technical field of combustible gas detection equipment, and particularly relates to a device and a method for preventing a catalytic combustion sensor from being poisoned.
Background
In many locations, we encounter a wide variety of combustible gases and vapors. When their concentration is sufficient, many substance vapors and gases become flammable hazardous gases and can explode if they encounter a fire source and provide some energy.
In order to protect the safety of life and property, a catalytic combustion type sensor is adopted to detect combustible gas in the industry at present, the catalytic combustion type sensor is internally composed of a detection element and a compensation element, and the catalytic combustion type sensor has the advantages of simple principle, high cost performance and the like. The two elements and the standard resistor are connected to form a Wheatstone bridge, the bridge is balanced when no combustible gas exists, when the combustible gas in the air is diffused to the detection element of the sensor, oxidation reaction is generated on the surface of the detection element, the temperature of the detection element is increased, the resistance value is increased, the bridge is out of balance, and a voltage signal which is in linear relation with the concentration of the combustible gas is output.
However, the catalytic combustion sensor has a fatal problem that if a silicon-containing compound, a lead-containing compound, or the like is present in the environment, the sensor is easily poisoned or degraded in performance. The failure mechanism is as follows: when the catalytic combustion sensor works, the temperature of the detection element and the compensation element is about 500 ℃, the catalyst can be decomposed, solid substances can be formed on the surface of the catalyst, and the normal work of the sensor is influenced. No effective solutions are currently available on the market, mostly based on precautions such as increasing filters, reducing exposure time to toxic gases, frequent replacement of sensors, not using materials containing substances poisoning the sensors, etc. However, the problem cannot be completely solved by prevention, and once the sensor is poisoned, the detector cannot detect the gas leakage in time, so that serious consequences are caused.
Disclosure of Invention
The invention provides a device and a method for preventing a catalytic combustion sensor from being poisoned, aiming at the problems that the catalytic combustion sensor in the prior art is easy to be poisoned and invalid, and the poisoning of the catalytic combustion sensor can not be fundamentally solved by adopting means of frequent replacement, reduction of the exposure time of the catalytic combustion sensor in toxic gas and the like when the catalytic combustion sensor is invalid.
The technical scheme of the invention is as follows: the utility model provides a prevent device that catalytic combustion sensor was poisoned, includes catalytic combustion sensor and signal processing circuit, and the sensor is handled signal transmission for signal processing circuit to the signal transmission who gathers, still includes singlechip and control circuit, and the singlechip is connected with control circuit, and control circuit is connected with the catalytic combustion sensor, and the catalytic combustion sensor is connected with signal processing circuit, and signal processing circuit feeds back the signal of catalytic combustion sensor to the singlechip.
The device for preventing the catalytic combustion sensor from being poisoned comprises a control circuit and a singlechip, wherein the control circuit comprises two MOS tubes, the two MOS tubes are respectively connected with a compensation resistor and a detection resistor of the sensor in parallel, and the G ends of the MOS tubes are connected with an I/O pin of the singlechip through resistors.
The device for preventing the catalytic combustion sensor from being poisoned comprises a control circuit and a singlechip, wherein the control circuit comprises two relays which are respectively connected with a compensation resistor and a detection resistor of the sensor in parallel, and the control ends of the relays are connected with an input/output (I/O) pin of the singlechip.
The device for stopping the catalytic combustion sensor from being poisoned comprises a signal processing circuit, a voltage stabilizing circuit and a voltage stabilizing circuit, wherein the signal processing circuit comprises a balance resistor, an amplifier and a detection resistor, the balance resistor is connected with the catalytic combustion sensor in parallel, the balance resistor and the balance resistor of the catalytic combustion sensor form a Wheatstone bridge, an instrument amplifying circuit is formed by the amplifier, and the output end of the amplifier is respectively connected with an AD acquisition pin of a singlechip; the detection resistor is connected between the catalytic combustion sensor and the ground in series, a voltage detection wiring is arranged between the detection resistor and the catalytic combustion sensor, and the wiring is connected with an AD acquisition pin of the single chip microcomputer.
A method of preventing poisoning of a catalytic combustion sensor, comprising the steps of:
step 1: the signal processing circuit sends the voltage signal Vo of Ro to the single chip microcomputer;
step 2: the single chip microcomputer judges whether the catalytic combustion sensor needs to be activated or not according to the received signal;
and step 3: the single chip microcomputer sends an activation signal to the control circuit to activate the catalytic combustion sensor.
The method for preventing the catalytic combustion sensor from being poisoned includes the following specific steps of 2: the single chip microcomputer compares the received Vo signal with Vo data of the catalytic combustion sensor when the sensor is normal, and if the received Vo signal is within a normal range, the single chip microcomputer does not execute an activation program to send out rectangular wave pulses; if the single chip microcomputer compares the received Vo signal with Vo data of the catalytic combustion sensor when the catalytic combustion sensor is normal, and if the received Vo signal is not in a normal range, an activation program is started.
The method for preventing the catalytic combustion sensor from being poisoned comprises the following specific steps of 3: the singlechip outputs rectangular waves, and when the output rectangular waves are low-level signals, the MOS tube connected with the compensation resistor in parallel is activated to increase the current of the detection resistor, so that toxic substances attached to the detection resistor are burnt out when the temperature of the detection resistor rises; when the single chip outputs a low level signal to activate the MOS tube connected in parallel with the detection resistor, the current of the compensation resistor is increased, so that toxic substances attached to the compensation resistor are burnt out when the temperature of the compensation resistor is increased.
The beneficial effects of the invention are: the device for preventing the catalytic combustion sensor from being poisoned realizes the activation mode of the sensor through the singlechip control circuit, feeds back the sensor to the singlechip through the signal processing circuit and monitors the state of the sensor in real time; the poisoning prevention and activation of the sensor are realized in a mode of generating short-time large current through short circuit; the detection resistor and the compensation resistor of the sensor are respectively short-circuited by controlling the MOS tube. The working state of the sensor is analyzed through the signal processing circuit and fed back to the single chip microcomputer so as to better adjust the control circuit; the invention can effectively avoid sensor poisoning, and can reactivate the sensor even if the sensor is poisoned.
Drawings
FIG. 1 is a schematic illustration of a device connection for preventing poisoning of a catalytic combustion sensor;
FIG. 2 is a schematic diagram of the connection of the control circuit to the catalytic combustion sensor;
FIG. 3 is a schematic diagram of the connection of the signal processing circuit to the catalytic combustion sensor;
FIG. 4 is a schematic diagram of a wiring pin of the single chip microcomputer;
in the figure, 1 is a detection resistor, 2 is a compensation resistor, and 3 is a catalytic combustion sensor.
Detailed Description
Example 1: with reference to fig. 1-4, the device for preventing the catalytic combustion sensor from being poisoned comprises the catalytic combustion sensor and a signal processing circuit, wherein the sensor transmits collected signals to the signal processing circuit for processing, the device further comprises a single chip microcomputer and a control circuit, the single chip microcomputer is connected with the control circuit, the control circuit is connected with the catalytic combustion sensor, the catalytic combustion sensor is connected with the signal processing circuit, and the signal processing circuit feeds back the signals of the catalytic combustion sensor to the single chip microcomputer.
The control circuit comprises two MOS tubes, the two MOS tubes are respectively connected with the compensation resistor and the detection resistor of the sensor in parallel, and the G ends of the MOS tubes are connected with the I/O pin of the single chip microcomputer. Specifically, the control circuit controls the base electrodes of the two MOS tubes through the single chip microcomputer, and when the single chip microcomputer does not control the MOS tubes, the two MOS tubes keep high level under the action of the pull-up resistors R12 and R13, so that the MOS tubes are in a disconnected state, and the sensor normally detects the MOS tubes. When the single chip microcomputer I/O1 outputs a low level, the MOS tube Q1 is conducted, so that the compensation resistor is in a short circuit, the current of the detection resistor is increased, the temperature is increased, and toxic substances attached to the temperature are burnt; similarly, when the singlechip I/O2 outputs low level, the MOS tube Q2 is conducted, so that the detection resistor is short-circuited, the compensation resistor current is increased, the temperature is increased, toxic substances attached to the detection resistor are burnt, and the normal detection of the detection resistor is ensured. Wherein, the MOS tube can be replaced by a relay or a reed switch.
The signal processing circuit comprises a balance resistor and an amplifier, the balance resistor is connected with the catalytic combustion sensor in parallel, the balance resistor and the balance resistor of the catalytic combustion sensor form a Wheatstone bridge, the amplifier forms an instrument amplifying circuit, and the output end of the amplifier is respectively connected with an AD acquisition pin of the singlechip; the detection resistor is connected in series between the catalytic combustion sensor and the ground, a voltage detection wiring is arranged between the detection resistor and the catalytic combustion sensor, and the wiring is connected with an AD acquisition pin of the single chip microcomputer. Specifically, the signal processing circuit amplifies the sensor signal and transmits the amplified signal to the single chip microcomputer, so that the single chip microcomputer can analyze the state of the sensor in real time. In fig. 3, R3 and R4 are balance resistors, and a wheatstone bridge is formed by a detection resistor and a compensation resistor of the sensor, the signal is amplified by an operational amplifier circuit for the instrument formed by U2, and the outputs Vout1 and Vout2 are differentially acquired by a single-chip analog-to-digital converter. The resistor R0 is a detection resistor which is a small-resistance resistor, and when the sensor works normally, the voltage of the sensor is in a range. The single chip microcomputer collects the voltage of the Vo end in real time. And analyzing whether the state of the sensor is in a normal range or not after the voltage Vo generated by the detection resistor Ro is converted by digital/analog, and judging whether the sensor needs to be activated or not and judging the condition after the sensor is activated, so that a circuit for controlling the activation of the sensor is regulated through I/O1 and I/O2.
A method of preventing poisoning of a catalytic combustion sensor, comprising the steps of:
step 1: the signal processing circuit sends the received signals sent by the catalytic combustion sensor to the singlechip;
and 2, step: the single chip microcomputer judges whether the catalytic combustion sensor needs to be activated or not according to the received signals; the method specifically comprises the following steps: comparing the received Vo signal with Vo data of the catalytic combustion sensor when the catalytic combustion sensor is normal by the single chip microcomputer, and if the received Vo signal is within a normal range, not executing an activation program by the single chip microcomputer to send out rectangular wave pulses; if the single chip microcomputer compares the received Vo signal with Vo data of the catalytic combustion sensor when the sensor is normal, and if the received Vo signal is not in a normal range, an activation program is started.
Furthermore, the abnormal signal detected by the single chip microcomputer may also be a signal that the catalytic combustion sensor detects combustible gas, the detected abnormal signal changes rapidly at the moment and is greatly different from the abnormal signal when the catalytic combustion sensor is poisoned, and meanwhile, the signal data of the combustible gas detected by the catalytic combustion sensor can also be stored in the single chip microcomputer for the single chip microcomputer to judge and use.
And step 3: the singlechip sends an activation signal to the control circuit to activate the catalytic combustion sensor, and the method specifically comprises the following steps: the singlechip outputs rectangular waves, and when the output rectangular waves are low-level signals, the MOS tube connected with the compensation resistor in parallel is activated to cause the current of the detection resistor to be increased, so that toxic substances attached to the detection resistor are burnt out when the temperature of the detection resistor is increased; when the single chip outputs a low level signal to activate the MOS tube connected in parallel with the detection resistor, the current of the compensation resistor is increased, so that toxic substances attached to the compensation resistor are burnt out when the temperature of the compensation resistor is increased.
Claims (1)
1. A method of preventing poisoning of a catalytic combustion sensor, the method being implemented on the basis of an apparatus for preventing poisoning of a catalytic combustion sensor, characterized by:
the device comprises a catalytic combustion sensor and a signal processing circuit, wherein the sensor transmits collected signals to the signal processing circuit for processing, and further comprises a single chip microcomputer and a control circuit, the single chip microcomputer is connected with the control circuit, the control circuit is connected with the catalytic combustion sensor, the catalytic combustion sensor is connected with the signal processing circuit, and the signal processing circuit feeds back signals of the catalytic combustion sensor to the single chip microcomputer;
the control circuit comprises two MOS tubes, the two MOS tubes are respectively connected with a compensation resistor and a detection resistor of the sensor in parallel, and the G ends of the MOS tubes are connected with an I/O pin of the singlechip through resistors;
the control circuit comprises two relays which are respectively connected with the compensation resistor and the detection resistor of the sensor in parallel, and the control ends of the relays are connected with the I/O pin of the single chip microcomputer;
the signal processing circuit comprises a balance resistor, an amplifier and a detection resistor, the balance resistor is connected with the catalytic combustion sensor in parallel, the balance resistor and the balance resistor of the catalytic combustion sensor form a Wheatstone bridge, the amplifier forms an instrument amplifying circuit, and the output end of the amplifier is respectively connected with an AD acquisition pin of the singlechip; the detection resistor is connected in series between the catalytic combustion sensor and the ground, a voltage detection wiring is arranged between the detection resistor and the catalytic combustion sensor, and the wiring is connected with an AD acquisition pin of the singlechip;
the method comprises the following steps:
step 1: the signal processing circuit sends a voltage signal Vo of the detection resistor Ro to the single chip microcomputer;
and 2, step: the single chip microcomputer judges whether the catalytic combustion sensor needs to be activated or not according to the received signals;
and step 3: the singlechip sends an activation signal to the control circuit to activate the catalytic combustion sensor;
the step 2 specifically comprises: comparing the received Vo signal with Vo data of the catalytic combustion sensor when the catalytic combustion sensor is normal by the single chip microcomputer, and if the received Vo signal is within a normal range, not executing an activation program by the single chip microcomputer to send out rectangular wave pulses; if the single chip microcomputer compares the received Vo signal with Vo data of the catalytic combustion sensor when the catalytic combustion sensor is normal, and if the received Vo signal is not in a normal range, starting an activation program;
the step 3 specifically comprises the following steps: the singlechip outputs rectangular waves, and when the output rectangular waves are low-level signals, the MOS tube connected in parallel with the compensation resistor is activated, so that the current of the detection resistor is increased, and toxic substances attached to the detection resistor are burnt out due to the temperature rise of the detection resistor; when the single chip outputs a low level signal to activate the MOS tube connected in parallel with the detection resistor, the current of the compensation resistor is increased, so that toxic substances attached to the compensation resistor are burnt out when the temperature of the compensation resistor is increased.
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| CN201710050278.3A CN106596836B (en) | 2017-01-23 | 2017-01-23 | Device and method for preventing catalytic combustion sensor from being poisoned |
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| CN201710050278.3A CN106596836B (en) | 2017-01-23 | 2017-01-23 | Device and method for preventing catalytic combustion sensor from being poisoned |
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| CN106596836B true CN106596836B (en) | 2023-03-28 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203982549U (en) * | 2014-07-17 | 2014-12-03 | 钟云龙 | Practical combustible gas detecting alarm |
Family Cites Families (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5743123A (en) * | 1980-08-29 | 1982-03-11 | Toshiba Corp | Safety apparatus for burning |
| CN2526842Y (en) * | 2002-03-04 | 2002-12-18 | 袁金杨 | Combustible gas leakage detector |
| JP2006201100A (en) * | 2005-01-24 | 2006-08-03 | Matsushita Electric Ind Co Ltd | Hydrogen gas detection sensor |
| JP2007327806A (en) * | 2006-06-07 | 2007-12-20 | Ngk Spark Plug Co Ltd | Catalytic combustion type gas sensor, and gas detector |
| JP2009002888A (en) * | 2007-06-25 | 2009-01-08 | Yazaki Corp | Contact combustion type gas sensor |
| JP5179997B2 (en) * | 2008-08-08 | 2013-04-10 | 矢崎総業株式会社 | Gas detector |
| CN202814906U (en) * | 2012-02-27 | 2013-03-20 | 上海恩尼克思工业仪器有限公司 | Catalytic combustion type gas sensor |
| CN202535034U (en) * | 2012-04-26 | 2012-11-14 | 成都安可信电子股份有限公司 | Catalytic combustion gas sensor overrun protection circuit |
| CN102638026A (en) * | 2012-04-26 | 2012-08-15 | 成都安可信电子股份有限公司 | Ultralimit protection circuit and method of catalytic combustion gas sensor |
| CN106324047B (en) * | 2015-07-03 | 2020-04-21 | 上海戴维蓝普传感技术有限公司 | Device and method for evaluating service life of catalytic combustion sensor |
| KR101734263B1 (en) * | 2015-07-13 | 2017-05-11 | 현대자동차 주식회사 | Apparatus and method for removing poison of lamda sensor |
| CN105092661A (en) * | 2015-09-08 | 2015-11-25 | 无锡百灵传感技术有限公司 | Catalytic combustion-type gas sensor |
| CN205644905U (en) * | 2016-03-25 | 2016-10-12 | 成都伯泰科技有限公司 | Intelligent monitoring system is leaked in gas based on processing circuit |
| CN206460012U (en) * | 2017-01-23 | 2017-09-01 | 河南驰诚电气股份有限公司 | A kind of device for preventing catalytic combustion sensor to be poisoned |
-
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203982549U (en) * | 2014-07-17 | 2014-12-03 | 钟云龙 | Practical combustible gas detecting alarm |
Non-Patent Citations (1)
| Title |
|---|
| 毛文安 ; 张海峰 ; .基于MSP430单片机的可燃气体探测器设计.杭州电子科技大学学报.2007,(第06期),第24-27页. * |
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