CN208239405U - A kind of decoupled sensor arrangement and online gas detector - Google Patents
A kind of decoupled sensor arrangement and online gas detector Download PDFInfo
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- CN208239405U CN208239405U CN201820886602.5U CN201820886602U CN208239405U CN 208239405 U CN208239405 U CN 208239405U CN 201820886602 U CN201820886602 U CN 201820886602U CN 208239405 U CN208239405 U CN 208239405U
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Abstract
The utility model discloses a kind of decoupled sensor arrangement and online gas detector, online gas detector includes detector body, several connectors and several decoupled sensor arrangements；Each decoupled sensor arrangement is mounted on the inside of any connector, and the signal pins of decoupled sensor arrangement are inserted into the switching interface of connector and corresponding electrical connection, on the external interface of the switching interface insertion detector body of connector；Decoupled sensor arrangement acquisition object gas and ambient temperature simultaneously export corresponding concentration AD value and temperature AD value, are transmitted to detector body by connector.By integrating and being made into decoupled sensor arrangement gas detection, AD acquisition, temperature detection and store function, when there is gas sensor failure or failure, decoupled sensor arrangement can be directly replaced.Solve the problems, such as that existing online gas detecting instrument replacing sensor is inconvenient.
Description
Technical field
The utility model relates to gas monitoring techniques field, in particular to a kind of decoupled sensor arrangement and online gas
Bulk detector.
Background technique
The fast development of China's economic has pushed the perfect and upgrading of infrastructure, and high-speed rail, city piping lane are all Chinese warps
Help fast-developing product.And also should not be underestimated to the detection of the use environment of city piping lane and tunnel, the measurement of environmental parameter
Important reference can be provided for related personnel, the effective generation for preventing safety accident.
Current online gas detecting instrument is mostly integral type, and sensor and control unit are integrated.This mode
Detection instrument to occupy share on the market larger.Traditional online gas detecting instrument is mainly the telecommunications for generating sensor
It number amplifies, data acquisition is carried out by ADC, then temperature-compensating, the line of electric signal and concentration value are utilized by control unit
The AD value of acquisition is converted concentration value by sexual intercourse algorithm, is transmitted to display screen display, also passes through digital signal protocol or mould
Quasi- signal is exported to corresponding platform.
Current online gas detecting instrument cannot be accomplished completely compatible when using different sensors on circuit.Secondly,
It is easily corroded outside since the pin of sensor is directly exposed, causes sensor degradation.Again, online gas detecting instrument
The factors such as the limitation due to structure design cause the consistency of batch production and stability poor, the calibration for sensor
Complete machine calibration must be carried out, the production efficiency of producer is affected.Finally, client such as occur in use sensor fault,
The problems such as failure, more emat sensor, need the service technician of producer to remove sensor to scene re-calibration or client
It returns producer and re-starts calibration, increase maintenance cost, influence the use of client.
Thus the prior art could be improved and improve.
Utility model content
Place in view of above-mentioned deficiencies of the prior art, the purpose of this utility model is to provide a kind of decoupled sensor dresses
It sets and online gas detector, to solve the problems, such as that existing online gas detecting instrument replacing sensor is inconvenient.
In order to achieve the above object, the utility model takes following technical scheme:
A kind of decoupled sensor arrangement is connect by connector with detector body comprising be welded with gas sensing
The first circuit board of device, for protecting and accommodating the sensor protection upper cover of gas sensor, with the gas on first circuit board
The sensor protection pedestal of the pin electrical connection of sensor, is provided with 5 signal pins and is electrically connected with sensor protection pedestal
Second circuit board, second circuit board and the opening of sensor protection upper cover are fastened and connected.
In the decoupled sensor arrangement, including gas detection cell, temperature detecting unit and sensor unit；Institute
It states sensor unit connection gas detection cell and connector, temperature detecting unit is connect with connector by I2C bus: is described
Respective sensor in gas detection cell, temperature detecting unit and sensor unit is arranged on first circuit board；
The concentration of gas detection cell detection object gas simultaneously exports the concentration signal of corresponding gas to sensor list
Member, the temperature of temperature detecting unit detection object gas local environment simultaneously export corresponding temperature AD value；Sensor unit is to dense
Degree signal carries out analog-to-digital conversion and exports corresponding concentration AD value, also stores the parameter of gas sensor and the AD value of calibration；Temperature
It spends AD value and concentration AD value and detector body is transmitted to by connector.
In the decoupled sensor arrangement, the gas detection cell includes gas sensor and filter and amplification electricity
Road, the filter amplification circuit connection gas sensor and sensor unit；
The concentration of the gas sensor detection ambient enviroment object gas and the concentration signal for exporting corresponding gas, filtering
Amplifying circuit is filtered after amplification the concentration signal and exports simulated concentration signal to sensor unit.
In the decoupled sensor arrangement, the sensor unit includes storage chip and AD unit, the storage
Chip is connect with connector by I2C bus, and AD unit connects filter amplification circuit and connector；
The storage chip is used to store parameter, the AD value of calibration of the gas sensor of setting；AD unit puts filtering
Simulated concentration signal after big carries out analog-to-digital conversion, exports corresponding concentration AD value and is exported by I2C bus to connector, leads to
It crosses connector and is transmitted to detector body.
In the decoupled sensor arrangement, the filter amplification circuit include first comparator, the second comparator,
Metal-oxide-semiconductor, gas sensor, first resistor, second resistance, 3rd resistor, the 4th resistance, first capacitor and the second capacitor；
One end of non-inverting input terminal connection first resistor, one end and second of second resistance of the first comparator are compared
The non-inverting input terminal of device；The other end of first resistor and the other end of second resistance are grounded, the anti-phase input of first comparator
End connects the output end of first comparator and the C foot of gas sensor, the inverting input terminal of first comparator by first capacitor
The R foot of gas sensor and the source electrode of metal-oxide-semiconductor are also connected by 3rd resistor, the grid of metal-oxide-semiconductor connects feeder ear, gas sensing
The drain electrode of the S foot connection metal-oxide-semiconductor of device and the inverting input terminal of the second comparator, the inverting input terminal of the second comparator pass through second
The output end and sensor unit of the second comparator of capacitance connection, the 4th resistance are in parallel with the second capacitor.
In the decoupled sensor arrangement, the temperature detecting unit include: temperature sensor, third capacitor and
5th resistance；
The SDA foot and SCL foot of the temperature sensor be separately connected decoupled sensor arrangement the first signal pins and
Second signal pin；The OS foot of temperature sensor connects feeder ear by the 5th resistance；The VCC foot of temperature sensor connects power supply
It holds, one end of the A0 foot of temperature sensor, the A1 foot of temperature sensor and third capacitor；The A2 foot of temperature sensor connects third
The other end of capacitor, the GND foot of temperature sensor and ground.
In the decoupled sensor arrangement, the AD unit includes: AD conversion chip, the 6th resistance, the 7th electricity
Resistance, the 8th resistance, the 9th resistance, the tenth resistance, the 4th capacitor and the 5th capacitor；
The Vin+ foot of the AD conversion chip connects the output end of the second comparator by the 6th resistance, AD conversion chip
Vin+ foot also passes through the 4th capacity earth, and the SCL foot and SDA foot of AD conversion chip are separately connected the of decoupled sensor arrangement
Three signal pins and fourth signal pin；The VDD foot of AD conversion chip connects one end of the 5th capacitor, feeder ear, the 7th resistance
One end and the 8th resistance one end；The other end of 5th capacitor is grounded, the other end connection AD conversion chip of the 7th resistance
SDA foot, the SCL foot of the other end connection AD conversion chip of the 8th resistance, the Vin- foot of AD conversion chip are connected by the 9th resistance
Feeder ear is connect, the Vin- foot of AD conversion chip also passes through the tenth resistance eutral grounding.
A kind of online gas detector, including detector body, further include several connectors and several described in
Decoupled sensor arrangement；
Each decoupled sensor arrangement is mounted on the inside of any connector, the signal pins of decoupled sensor arrangement
It is inserted into the switching interface of connector and corresponding electrical connection, the switching interface of connector is inserted into the external interface of detector body
On；
The decoupled sensor arrangement acquisition object gas and ambient temperature simultaneously export corresponding concentration AD value and temperature
AD value is transmitted to detector body by connector；Detector body shows the concentration value of corresponding gas according to concentration AD value, and
It is more than alarm setting value alarm in concentration value；Detector body carries out temperature-compensating also according to temperature AD value with calibration concentration
Value.
In the online gas detector, the connector includes lower cover and upper cover；
The upper cover is internally provided with 5 switching interfaces, and 5 signals for being inserted into decoupled sensor arrangement bottom draw
Foot；It is isolated between the inside top of lower cover and the top of decoupled sensor arrangement by a waterproof and breathable diaphragm, outside upper cover
Side is provided with external screw thread, and the external screw thread is adapted to the internal screw thread of lower cover bottom inside, internal screw thread and external screw thread is tightened under making
Lid is connected as an entirety with upper cover.
In the online gas detector, the protrusion periphery setting first at the top of the decoupled sensor arrangement is anti-
The second waterproof grommet is arranged on the external screw thread in waterstop ring.
Compared to the prior art, decoupled sensor arrangement provided by the utility model and online gas detector,
Wire type gas detector includes detector body, several connectors and several decoupled sensor arrangements；Each separate type
Sensor device is mounted on the inside of any connector, and the switching of the signal pins insertion connector of decoupled sensor arrangement connects
In mouthful and corresponding electrical connection, the switching interface of connector are inserted on the external interface of detector body；The decoupled sensor
Device acquisition object gas and ambient temperature simultaneously export corresponding concentration AD value and temperature AD value, are transmitted to detection by connector
Device main body；Detector body shows the concentration value of corresponding gas according to concentration AD value, and when concentration value is more than alarm setting value
Alarm；Detector body carries out temperature-compensating also according to temperature AD value with calibration concentration value.By acquiring gas detection, AD,
Temperature detection and store function, which integrate, is made into decoupled sensor arrangement, gas sensor failure or failure occurs
When, it can directly replace decoupled sensor arrangement.Solve asking for existing online gas detecting instrument replacing sensor inconvenience
Topic.
Detailed description of the invention
Fig. 1 is the structural block diagram of online gas detector provided by the utility model.
Fig. 2 is the structure chart of decoupled sensor arrangement provided by the utility model and connector.
Fig. 3 is the diagrammatic cross-section of decoupled sensor arrangement provided by the utility model and connector.
Fig. 4 is the explosion figure of decoupled sensor arrangement provided by the invention and connector.
Fig. 5 is the schematic diagram of decoupled sensor arrangement provided by the invention.
Fig. 6 is the circuit diagram of filter amplification circuit in decoupled sensor arrangement provided by the utility model.
Fig. 7 is the circuit diagram of temperature detecting unit in decoupled sensor arrangement provided by the utility model.
Fig. 8 is the circuit diagram of AD unit in decoupled sensor arrangement provided by the utility model.
Fig. 9 is the circuit diagram of storage chip in decoupled sensor arrangement provided by the utility model.
Specific embodiment
The utility model provides a kind of decoupled sensor arrangement and online gas detector, by existing sensor list
Member is separated with control panel, and the function of control panel part is constant, can be produced sensor unit in batches in this way and be detected without considering
The type of device, the circuit of sensor unit is according to sensor type difference different from, when being demarcated, need to only demarcate sensing
Device unit need not carry out complete machine calibration.To keep the purpose of this utility model, technical solution and effect clearer, clear, below
Embodiment is developed simultaneously to the utility model further description referring to attached drawing.It should be appreciated that specific embodiment described herein
Only to explain the utility model, it is not used to limit the utility model.
Please refer to Fig. 1 and Fig. 2, online gas detector provided by the embodiment of the utility model includes several points
From formula sensor device 10, detector body 20 and several connectors 30(31 and 32), decoupled sensor arrangement 10 is installed
The inside of a connection piece 30 in office, (the present embodiment is 5 to the signal pins of decoupled sensor arrangement 10, logical comprising one group of IIC
News) it is inserted into the switching interface of connector 30 and corresponds to electrical connection.The switching interface insertion detector body 20 of connector 30
On external interface, such decoupled sensor arrangement 10 is electrically connected by connector 30 with detector body 20.The separate type
Sensor device 10 acquires object gas and ambient temperature and exports corresponding concentration AD value and temperature AD value, passes through connector 30
It is transmitted to detector body 20；Detector body 20 shows the concentration value of corresponding gas according to concentration AD value, and super in concentration value
Cross alarm setting value alarm；Detector body 20 carries out temperature-compensating also according to temperature AD value with calibration concentration value.
In the present embodiment, the connector 30 includes lower cover 31 and upper cover 32；It is as shown in Figure 2, Figure 3 and Figure 4: the upper cover
32 are internally provided with 5 switching interfaces 321, for being inserted into a kind of 5 signal pins (needles of 10 bottom of decoupled sensor arrangement
Foot), 5 signal pins and 5 switching interface 321(have carried out fool proof setting) position it is corresponding；Pass through this inserting mode
Connect together decoupled sensor arrangement 10 with upper cover 32.The inside top and decoupled sensor arrangement 10 of lower cover 31
Top between by waterproof and breathable diaphragm 2 be isolated, play the role of water proof and dust proof filtering；Preferably, it can also be passed in separate type
First waterproof grommet 3 of protrusion periphery setting at the top of sensor arrangement 10, with abut extruding on the inside of lower cover 31 and play sealing waterproof
Effect；The outside of upper cover 32 is provided with external screw thread 322, and the external screw thread 322 is adapted to the internal screw thread of 31 bottom inside of lower cover.
Decoupled sensor arrangement 10 is first inserted into upper cover 32, internal screw thread and external screw thread 322 are being tightened to make lower cover 31 and upper cover
32 connections are integral.Preferably, the second waterproof grommet 12 of shape of threads can be also set on external screw thread 322 to carry out waterproof
Processing；Also epoxy resin can be filled to protect in the lug boss of upper cover 32.
The decoupled sensor arrangement 10 is mainly set thereon including being welded with the first circuit board 6(of gas sensor 5
Set corresponding sensor), for protecting and accommodating the sensor protection upper cover 4 of gas sensor 5, on first circuit board 6
Gas sensor 5 pin electrical connection sensor protection pedestal 7, be provided with 5 signal pins and with sensor protection pedestal 7
Circuit relevant to signal processing and transmission is mainly arranged in the second circuit board 8(of electrical connection thereon), second circuit board 8 and biography
The opening of sensor protection upper cover 4 is fastened and connected.Preferably, can be arranged between sensor protection pedestal 7 and second circuit board 8
Third waterproof grommet 10 is to carry out water-proofing treatment.
In the present embodiment, gas detection cell 110, temperature are provided on the circuit board of the decoupled sensor arrangement 10
Detection unit 120 and sensor unit 130；The sensor unit 130 connects gas detection cell 110 and temperature detecting unit
120, sensor unit 130 passes through I2C bus and 20 communication connection of detector body.
Wherein, (object gas contains concentration of the gas detection cell 110 for detecting object gas i.e. in environment
Amount) and the concentration signal of corresponding gas is exported to sensor unit；It includes gas sensor 111 and filter amplification circuit 112:
The filter amplification circuit 112 connects gas sensor 111 and sensor unit 130.The gas sensor detects surrounding ring
The concentration of border object gas and the concentration signal (VR, VS) for exporting corresponding gas, filter amplification circuit 12 is to the concentration signal
Simulated concentration signal SIG is exported to sensor unit 130 after being filtered amplification.The type of object gas and gas sensor
Type adaptation, object gas can be CO(carbon monoxide), SO2(sulfur dioxide), CO2(carbon dioxide), O3(ozone) etc..
The a type of gas sensor of setting in one gas detection cell 110.A then decoupled sensor arrangement
10 can detect a kind of object gas.One or several the settable external interfaces of detector body 20, when being arranged one, need to examine
Survey which kind of gas directly changes corresponding decoupled sensor arrangement 10 in connector 30；If multiple external connect is arranged
Mouthful, then inspection while different decoupled sensor arrangements 10 realizes plurality of target gas can be connected by multiple connectors 30
It surveys.The number and type for the decoupled sensor arrangement 10 that can be connected to detector body 20 herein are not construed as limiting.Preferably,
Electrochemical sensor can be selected in gas sensor.
120 built-in temperature sensor of temperature detecting unit, for detecting the temperature of object gas local environment and defeated
Corresponding temperature AD value is to MCU out；When the temperature is changed, the output of temperature sensor also and then changes.Each separate type sensing
Device device 10 requires to carry out temperature detection, the detection of corresponding object gas can be made more accurate subsequently through temperature-compensating.
Preservation and gas concentration AD detection acquisition of the sensor unit 130 for parameter；It includes storage chip 131
With AD unit 132, storage chip 131 is connect with connector 30 by I2C bus, and AD unit 132 connects filter amplification circuit 112
With connector 30.MCU reads the state of each sensor from storage chip and initial parameter and is passed by I2C bus after booting
It is defeated.Corresponding gas and temperature acquisition are carried out after the completion of gas sensor preheating, AD unit is to the simulated concentration after filter and amplification
Signal SIG carries out analog-to-digital conversion, exports corresponding concentration AD value and is transmitted to MCU by I2C bus.Storage chip is for storing
The AD value of the calibration saved in the parameter of system setting and user setting, calibration, in booting when parameter passed into MCU.Together
When it also has and verifying function, when preventing read error, user is still referred to using measured value.
It is to be appreciated that temperature detecting unit 120, storage chip 131 and AD unit 132 be all by iic bus and
MCU is communicated；These three units are independent, MCU hosted in iic bus, and remaining element is all in the form of slave
In the presence of these three units transmit data using same iic bus.
The detector body 20 includes MCU 210, transmission unit 220, Infrared push button unit 230 and display unit 240；
The connection of MCU 210 transmission unit 220, Infrared push button unit 230 and display unit 240.
The MCU 210 for temperature compensation and concentration calculation, display, concentration over-standard/fault alarm, transmission unit 220 it is defeated
Out and the control at infrared remote control interface etc..It include: that parameter is written to biography by I2C bus in calibration and parameter setting
In the storage chip of sensor cell；It is ADC(Analog-to-Digital Converter according to concentration AD(AD full name), herein
Related AD is typically all noun, refers to the conversion value of ADC) value calculates the concentration value of gas and shows on the display unit
Show, and judges to alarm when concentration value is greater than or equal to alarm setting value；Sensor unit is calculated also according to temperature AD value
130 actual temperature values carry out temperature-compensating, available more accurate gas to zero point AD or span AD according to temperature value
Concentration value.
The transmission unit 220 is used to the parameters such as concentration value, gas type, range passing to host computer or controller
Deng other platforms.In the specific implementation, 4-20mA circuit and/or RS485 circuit, 4-20mA circuit can be used in transmission unit 220
MCU is all connected with RS485 circuit.4-20mA has the advantages that transmit at a distance as a kind of industrial information data transmission circuit.
When being communicated using RS485 circuit, other platforms can also carry out corresponding operation to detector host by RS485 circuit.
RS485 communication has many advantages, such as strong interference immunity, apart from remote.
The Infrared push button unit 230 is used to generate corresponding infrared remote control value according to button operation to MCU, red to realize
Outer remote control.The display unit 240 is made of LED light and LED display, is used to indicate the working condition of system, to phase
Parameter is closed to be configured, the sensor unit such as demarcate.Infrared push button unit 230 and display unit 24 are realized man-machine together
Interactive function.
Referring to Figure 6 together, the filter amplification circuit 112 of the gas detection cell 110 include first comparator U1A,
Second comparator U1B, metal-oxide-semiconductor Q1, first resistor R1, second resistance R2,3rd resistor R3, the 4th resistance R4, first capacitor C1
With the second capacitor C2；Non-inverting input terminal connection one end of first resistor R1 of the first comparator U1A, second resistance R2 one
The non-inverting input terminal at end and the second comparator U1B；The other end of first resistor R1 and the other end of second resistance R2 are grounded (tool
Body is to input corresponding bias VR, VS respectively when implementing, and for the reserved setting of the sensor of some band biass, the present embodiment is silent
Recognize ground connection), the inverting input terminal of first comparator U1A is gentle by the output end of first capacitor C1 connection first comparator U1A
The C foot of body sensor M, the inverting input terminal of first comparator U1A also pass through the R foot of 3rd resistor R3 connection gas sensor M
With the source electrode of metal-oxide-semiconductor Q1, the grid of metal-oxide-semiconductor Q1 connects feeder ear+3.3V, the leakage of the S foot connection metal-oxide-semiconductor Q1 of gas sensor M
The inverting input terminal of the inverting input terminal of pole and the second comparator U1B, the second comparator U1B passes through the second capacitor C2 connection second
The output end and sensor unit 130 of comparator U1B, the 4th resistance R4 are in parallel with the second capacitor C2.
Wherein, gas sensor M detects the concentration signal of corresponding gas, is preferably by first comparator U1A(model
MCP6032 it) is converted into voltage signal, is preferably MCP6032 using the second comparator U1B(model) voltage signal is amplified to
It is suitble to the amplitude of ADC acquisition, output simulated concentration signal SIG to sensor unit 130.It in the specific implementation, can also be in metal-oxide-semiconductor
A resistance is set to protect metal-oxide-semiconductor Q1 between the grid and feeder ear+3.3V of Q1, high current is avoided to burn out metal-oxide-semiconductor Q1.It can also set
It is in parallel with first capacitor C1 to set a resistance, the resistance or 3rd resistor R3 are accessed in circuit by choosing whether, are suitable for not
The amplification demand of same type gas sensor.It is to be appreciated that the particular circuit configurations of filter amplification circuit 112 can also basis
The type of gas sensor carries out corresponding modification, such as adjusts amplification coefficient, makes the concentration signal of various gas sensor outputs all
The simulated concentration signal SIG for being enlarged into suitable ADC acquisition can be converted.
Referring to Figure 7 together, the temperature detecting unit 120 includes: temperature sensor U1, third capacitor C3 and the 5th
Resistance R5；The SDA foot and SCL foot of the temperature sensor U1 are separately connected the first signal pins of decoupled sensor arrangement 10
With second signal pin (i.e. first group of IIC communication, transmission is temperature AD value (DATA1 and CLK1))；Temperature sensor U1's
OS foot passes through the 5th resistance R5 connection feeder ear+3.3V；The VCC foot of temperature sensor U1 connects feeder ear+3.3V, temperature sensing
One end of the A0 foot of device U1, the A1 foot of temperature sensor U1 and third capacitor C3；The A2 foot connection third electricity of temperature sensor U1
Hold the other end of C3, the GND foot and ground of temperature sensor U1.
Wherein, temperature sensor U1(model is preferably LM75A) it is adopted using technical grade temperature sensor progress operating temperature
Collect and compensated according to the signal that variation of ambient temperature acquires gas sensor, is conducive to system stability and reliability.
Also referring to Fig. 8, the AD unit 132 in the sensor unit 130 includes: AD conversion chip U2, the 6th electricity
Hinder R6, the 7th resistance R7, the 8th resistance R8, the 9th resistance R9, the tenth resistance R10, the 4th capacitor C1 and the 5th capacitor C5；It is described
The Vin+ foot of AD conversion chip U2 passes through the output end of the 6th resistance R6 the second comparator of connection U1B, the Vin of AD conversion chip U2
+ foot also passes through the 4th capacitor C4 ground connection, and the SCL foot and SDA foot of AD conversion chip U2 is separately connected decoupled sensor arrangement 10
Third signal pins and fourth signal pin (i.e. second group of IIC communication, transmission be gas concentration AD value (DATA and
CLK))；The VDD foot of AD conversion chip U2 connect one end of the 5th capacitor C5, feeder ear+3.3V, the 7th resistance R7 one end and
One end of 8th resistance R8；The other end of 5th capacitor C5 is grounded, the other end connection AD conversion chip U2's of the 7th resistance R7
SDA foot, the SCL foot of the other end connection AD conversion chip U2 of the 8th resistance R8, the Vin- foot of AD conversion chip U2 pass through the 9th
The Vin- foot of resistance R9 connection feeder ear+3.3V, AD conversion chip U2 also pass through the tenth resistance R10 ground connection.
Wherein, the model of AD conversion chip U2 is preferably ADS1110-ED0, and AD conversion chip U2 is to simulated concentration signal
SIG carries out analog-to-digital conversion, exports and is communicated to the concentration AD value of number using IIC, successively by third signal pins and the 4th letter
Number pin, the external interface of detector body 20, is finally transmitted in MCU the switching interface of connector 30.
Also referring to Fig. 9, in the sensor unit 130, the VDD foot of storage chip 131 connection feeder ear+3.3V and
One end of 6th capacitor C6, the HOLD foot of storage chip 131 connect the other end and ground of the 6th capacitor C6, storage chip 131
A0 foot, A1 foot, A2 foot and GND foot are grounded；The CLK foot and DATA foot of storage chip 131 are separately connected decoupled sensor dress
Set 10 the 5th signal pins and the 6th signal pins (i.e. third group IIC communication, transmission be parameter and calibration AD value
(DATA2 and CLK2)).
In the present embodiment, sensor unit 130 needs the auxiliary of some basic parameters in normal work, these are basic
Parameter is stored in storage chip 131(EEPROM, and model is preferably 24LCXX) in, storage chip 131 is in addition to assisting gas sensing
Device work is outer to be also stored a part of system calibration parameter, can very easily replace gas sensor to other systems in this way
On, it is highly convenient for safeguarding and use.
In conclusion decoupled sensor arrangement provided by the utility model and online gas detector, pass through module
Changing various gas sensors makes its independence, and the circuit package of gas sensor, AD acquisition, temperature detection and store function is existed
It is made into decoupled sensor arrangement together, and water proof and dust proof setting is carried out to the structure of decoupled sensor arrangement, avoids gas
The problem of body sensor pin corrosion.Parameter setting and calibration can be carried out to decoupled sensor arrangement batch when production, be not necessarily to
Complete machine rower is fixed, improves production efficiency.When there is gas sensor failure or failure, decoupled sensor dress can be directly replaced
Set (can producer calibration or user calibration), replaced and demarcated to scene without producer's service technician.With band electric heating
Plug function, when directly being replaced in the case where not power down can automatic identification gas sensor, be restarted automatically, do not influence it instantly
It uses, improves service quality and efficiency, while also reducing cost of serving.
The division of above-mentioned functional module is only to for example, in practical applications, can according to need above-mentioned function
Distribution is completed by different functional modules, that is, different functional modules is divided into, to complete all or part of foregoing description
Function.
It is understood that for those of ordinary skills, can with technical solution according to the present utility model and
The design of its utility model is subject to equivalent substitution or change, and all these changes or replacement all should belong to appended by the utility model
Scope of protection of the claims.
Claims (10)
1. a kind of decoupled sensor arrangement is connect, which is characterized in that including being welded with gas with detector body by connector
The first circuit board of body sensor, for protecting and accommodating the sensor protection upper cover of gas sensor, on first circuit board
Gas sensor pin electrical connection sensor protection pedestal, be provided with 5 signal pins and with sensor protection pedestal
The second circuit board of electrical connection, second circuit board and the opening of sensor protection upper cover are fastened and connected.
2. decoupled sensor arrangement according to claim 1, which is characterized in that examined including gas detection cell, temperature
Survey unit and sensor unit；Sensor unit connection gas detection cell and connector, temperature detecting unit with connect
Part is connected by I2C bus: the respective sensor setting in the gas detection cell, temperature detecting unit and sensor unit
On first circuit board；
The concentration of gas detection cell detection object gas simultaneously exports the concentration signal of corresponding gas to sensor unit, temperature
The temperature of degree detection unit detection object gas local environment simultaneously exports corresponding temperature AD value；Sensor unit is to concentration signal
It carries out analog-to-digital conversion and exports corresponding concentration AD value, also stores the parameter of gas sensor and the AD value of calibration；Temperature AD value
Detector body is transmitted to by connector with concentration AD value.
3. decoupled sensor arrangement according to claim 2, which is characterized in that the gas detection cell includes gas
Sensor and filter amplification circuit, the filter amplification circuit connection gas sensor and sensor unit；
The concentration of the gas sensor detection ambient enviroment object gas and the concentration signal for exporting corresponding gas, filter and amplification
Circuit is filtered after amplification the concentration signal and exports simulated concentration signal to sensor unit.
4. decoupled sensor arrangement according to claim 3, which is characterized in that the sensor unit includes storage core
Piece and AD unit, the storage chip are connect with connector by I2C bus, and AD unit connects filter amplification circuit and connection
Part；
The storage chip is used to store parameter, the AD value of calibration of the gas sensor of setting；After AD unit is to filter and amplification
Simulated concentration signal carry out analog-to-digital conversion, export corresponding concentration AD value and exported by I2C bus to connector, pass through company
Fitting is transmitted to detector body.
5. decoupled sensor arrangement according to claim 4, which is characterized in that the filter amplification circuit includes first
Comparator, the second comparator, metal-oxide-semiconductor, gas sensor, first resistor, second resistance, 3rd resistor, the 4th resistance, the first electricity
Hold and the second capacitor；
The non-inverting input terminal of the first comparator connects one end of first resistor, one end of second resistance and the second comparator
Non-inverting input terminal；The other end of first resistor and the other end of second resistance are grounded, and the inverting input terminal of first comparator is logical
The output end of first capacitor connection first comparator and the C foot of gas sensor are crossed, the inverting input terminal of first comparator is also logical
The R foot of 3rd resistor connection gas sensor and the source electrode of metal-oxide-semiconductor are crossed, the grid of metal-oxide-semiconductor connects feeder ear, gas sensor
S foot connects the drain electrode and the inverting input terminal of the second comparator of metal-oxide-semiconductor, and the inverting input terminal of the second comparator passes through the second capacitor
The output end and sensor unit of the second comparator are connected, the 4th resistance is in parallel with the second capacitor.
6. decoupled sensor arrangement according to claim 5, which is characterized in that the temperature detecting unit includes: temperature
Spend sensor, third capacitor and the 5th resistance；
The SDA foot and SCL foot of the temperature sensor are separately connected the first signal pins and second of decoupled sensor arrangement
Signal pins；The OS foot of temperature sensor connects feeder ear by the 5th resistance；The VCC foot connection feeder ear of temperature sensor,
One end of the A0 foot of temperature sensor, the A1 foot of temperature sensor and third capacitor；The A2 foot connection third electricity of temperature sensor
The other end of appearance, the GND foot of temperature sensor and ground.
7. decoupled sensor arrangement according to claim 6, which is characterized in that the AD unit includes: AD conversion core
Piece, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance, the tenth resistance, the 4th capacitor and the 5th capacitor；
The Vin+ foot of the AD conversion chip connects the output end of the second comparator, the Vin+ of AD conversion chip by the 6th resistance
Foot also passes through the 4th capacity earth, and the SCL foot and SDA foot of AD conversion chip are separately connected the third letter of decoupled sensor arrangement
Number pin and fourth signal pin；The VDD foot of AD conversion chip connect one end of the 5th capacitor, feeder ear, the 7th resistance one
The one end at end and the 8th resistance；The other end of 5th capacitor is grounded, the SDA of the other end connection AD conversion chip of the 7th resistance
Foot, the SCL foot of the other end connection AD conversion chip of the 8th resistance, the Vin- foot of AD conversion chip are supplied by the connection of the 9th resistance
The Vin- foot at electric end, AD conversion chip also passes through the tenth resistance eutral grounding.
8. a kind of online gas detector, including detector body, which is characterized in that further include several connectors and several
A such as described in any item decoupled sensor arrangements of claim 1-7；
Each decoupled sensor arrangement is mounted on the inside of any connector, the signal pins insertion of decoupled sensor arrangement
In the switching interface of connector and corresponding electrical connection, the switching interface of connector are inserted on the external interface of detector body；
The decoupled sensor arrangement acquisition object gas and ambient temperature simultaneously export corresponding concentration AD value and temperature AD value,
Detector body is transmitted to by connector；Detector body shows the concentration value of corresponding gas according to concentration AD value, and dense
Angle value is more than alarm setting value alarm；Detector body carries out temperature-compensating also according to temperature AD value with calibration concentration value.
9. online gas detector according to claim 8, which is characterized in that the connector includes lower cover and upper
Lid；
The upper cover is internally provided with 5 switching interfaces, for being inserted into 5 signal pins of decoupled sensor arrangement bottom；
It is isolated between the inside top of lower cover and the top of decoupled sensor arrangement by a waterproof and breathable diaphragm, is set on the outside of upper cover
Be equipped with external screw thread, the external screw thread is adapted to the internal screw thread of lower cover bottom inside, internal screw thread and external screw thread are tightened make lower cover with
It is whole that upper cover is connected as one.
10. online gas detector according to claim 9, which is characterized in that the decoupled sensor arrangement top
The first waterproof grommet is arranged in the protrusion periphery in portion, and the second waterproof grommet is arranged on the external screw thread.
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| CN108896108A (en) * | 2018-06-08 | 2018-11-27 | 深圳市无眼界科技有限公司 | A kind of decoupled sensor arrangement and online gas detector |
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