CN208872737U - Environmental gas concentration data acquisition device - Google Patents
Environmental gas concentration data acquisition device Download PDFInfo
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- CN208872737U CN208872737U CN201821684414.0U CN201821684414U CN208872737U CN 208872737 U CN208872737 U CN 208872737U CN 201821684414 U CN201821684414 U CN 201821684414U CN 208872737 U CN208872737 U CN 208872737U
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Abstract
The environmental gas concentration data acquisition device of the utility model is related to gas concentration data acquisition device, purpose is to overcome the problems, such as that existing gas concentration monitoring instrument body product is big and is easy to produce measurement error using solid state sensor, it includes cabinet, further includes data collecting card and gas path device；The beneficial effects of the utility model are: using solid state sensor, the volume of environmental gas concentration data acquisition device can greatly be reduced, and for the accuracy for guaranteeing measurement, exclusively for sensor design measurement gas chamber, so that sample gas is reacted in measurement gas chamber with gas concentration sensor, the air-tightness of gas concentration sensor can reduce well the measurement error of sensor measurement.
Description
Technical field
The utility model relates to gas concentration data acquisition devices, and in particular to the gas concentration data with measurement gas chamber
Acquisition device.
Background technique
100% response, the monitoring of widely applied atmosphere pollution can be generated for certain gas currently without sensor
Method is to analyze spectrum, such as fourier spectrometer (FTIR), gas chromatograph and mass spectrograph using optical instrument.This quasi-instrument
Advantage is that its high sensitivity, selectivity is good but expensive, volume is big and complicated for operation.And these factors result in gas
The distribution density of bulk concentration monitoring instrument is small.
And the gas concentration monitoring instrument device of solid state sensor, humidity, temperature and the gas flow rate of environment are all easy to enable solid
Sensor generates measurement error.
Utility model content
The purpose of this utility model is to overcome existing gas concentration monitoring instrument body products greatly and using solid sensing
Device is easy to produce the problem of measurement error, provides a kind of environmental gas concentration data acquisition device.
The environmental gas concentration data acquisition device of the utility model, including cabinet, further include data collecting card and gas circuit
Device；
It is fixed in cabinet outside data collecting card and gas path device, cabinet and is fixed with gas sampling and filtering equipment；Gas circuit
Device includes measurement gas chamber, auxiliary tank and air passage on-off device, gas sampling and filtering equipment, auxiliary tank and measurement gas chamber according to
Secondary connection constitutes sample gas detection path, sample gas can successively pass through gas sampling and filtering equipment, auxiliary tank and survey
Cabinet is discharged after amount gas chamber；
Gas path on-off dress is equipped between gas sampling and filtering equipment and auxiliary tank, between auxiliary tank and measurement gas chamber
It sets；The gas path on-off signal output end of data collecting card and the gas path on-off signal output end of air passage on-off device are electrically connected；
Auxiliary tank heating device and auxiliary tank Temperature Humidity Sensor are equipped in auxiliary tank；The auxiliary of data collecting card
The auxiliary tank heating signal input terminal of gas chamber heating signal output end and auxiliary tank heating device is electrically connected；Data acquisition
The auxiliary tank temperature-humidity signal input terminal of card and the auxiliary tank temperature-humidity signal output end of auxiliary tank Temperature Humidity Sensor
Electrical connection；
Measure gas chamber in be equipped with gas concentration sensor conditioning circuit, the gas concentration signal input terminal of data collecting card with
The electrical connection of gas concentration signal output end, conditioned signal output end and the gas concentration of gas concentration sensor conditioning circuit pass
The conditioned signal input terminal of sensor conditioning circuit is electrically connected；
Measurement gas chamber lateral wall is fixed with thermostatically-controlled equipment；The thermostatic control signal output end and constant temperature of data collecting card
The input terminal of the thermostatic control signal of control device is electrically connected.
The beneficial effects of the utility model are: can greatly reduce the acquisition of environmental gas concentration data using solid state sensor
The volume of device, and the accuracy in order to guarantee measurement, exclusively for sensor design measurement gas chamber, so that sample gas exists
It is reacted in measurement gas chamber with gas concentration sensor, the air-tightness of gas concentration sensor can reduce well the survey of sensor measurement
Measure error.
Detailed description of the invention
Fig. 1 is the electrical principle module map of the gas concentration data acquisition device of the utility model；
Fig. 2 is the external structure schematic diagram of the gas concentration data acquisition device of the utility model；
Fig. 3 is the schematic diagram of internal structure of the gas concentration data acquisition device of the utility model；
Fig. 4 is the flow chart of the gas path device of the gas concentration data acquisition device of the utility model；
Fig. 5 is the air pump pwm control circuit figure of the gas concentration data acquisition device of the utility model；
Fig. 6 is the air pump driving circuit figure of the gas concentration data acquisition device of the utility model；
Fig. 7 is the driving circuit for electromagnetic valve figure of the gas concentration data acquisition device of the utility model；
Fig. 8 is the conductor oxidate type gas concentration sensor tune of the gas concentration data acquisition device of the utility model
Manage circuit diagram；
Fig. 9 is the solid electrolyte type gas concentration sensor conditioning of the gas concentration data acquisition device of the utility model
Circuit diagram；
Figure 10 is the differential amplifier circuit figure of Fig. 9；
Figure 11 is the conductor oxidate type gas concentration sensor of the gas concentration data acquisition device of the utility model
Adding thermal resistance driving circuit figure；
Figure 12 is the solid electrolyte type gas concentration sensor of the gas concentration data acquisition device of the utility model
Adding thermal resistance driving circuit figure；
Figure 13 is the driving electricity of the thermostatically-controlled equipment radiator fan of the gas concentration data acquisition device of the utility model
Lu Tu；
Figure 14 is the driving circuit figure of the thermostatically-controlled equipment of the gas concentration data acquisition device of the utility model.
Specific embodiment
Specific embodiment one
The environmental gas concentration data acquisition device of the utility model, including cabinet 1, data collecting card 2 and gas path device
3；
It is fixed in cabinet 1 outside data collecting card 2 and gas path device 3, cabinet 1 and is fixed with gas sampling and filtering equipment 4；
Gas path device 3 includes measurement gas chamber 5, auxiliary tank 6 and air passage on-off device, gas sampling and filtering equipment 4,6 and of auxiliary tank
Measurement gas chamber 5 is sequentially communicated and constitutes sample gas detection path, sample gas can successively pass through gas sampling and filtering equipment 4,
Cabinet 1 is discharged after auxiliary tank 6 and measurement gas chamber 5；
It is logical that gas circuit is equipped between gas sampling and filtering equipment 4 and auxiliary tank 6, between auxiliary tank 6 and measurement gas chamber 5
Disconnected device；The gas path on-off signal output end of data collecting card 2 and the gas path on-off signal output end of air passage on-off device are electrical
Connection；
Auxiliary tank heating device and auxiliary tank Temperature Humidity Sensor are equipped in auxiliary tank 6；Data collecting card 2 it is auxiliary
The auxiliary tank heating signal input terminal of gas chamber heating signal output end and auxiliary tank heating device is helped to be electrically connected；Data are adopted
The auxiliary tank temperature-humidity signal input terminal of truck 2 and the auxiliary tank temperature-humidity signal of auxiliary tank Temperature Humidity Sensor export
End electrical connection；
It measures and is equipped with gas concentration sensor conditioning circuit, the gas concentration signal input terminal of data collecting card 2 in gas chamber 5
With the electrical connection of gas concentration signal output end, conditioned signal output end and the gas concentration of gas concentration sensor conditioning circuit
The conditioned signal input terminal of Conditioning Circuits of Sensor is electrically connected；
Measurement 5 lateral wall of gas chamber is fixed with thermostatically-controlled equipment 7；The thermostatic control signal output end of data collecting card 2 with
The input terminal of the thermostatic control signal of thermostatically-controlled equipment 7 is electrically connected.
The environmental gas concentration data acquisition device of the utility model, it is outside upper that gas sampling and filtering equipment 4 is mounted on cabinet 1
Side, the components such as gas path device 3, radiator, circuit board and power supply are all mounted in cabinet 1.
As shown in figure 3, the components such as gas path device 3, radiator, circuit board and power supply are all fixed on one piece of machine
On the backboard of case 1,1 inner components of cabinet surround circuit-board laying-out, and circuit board shares three layers, are that device drives plate (is used respectively
In each driving circuit of fixation), data collecting card 1 and data collecting card 2.Three layer circuit boards are fixed together with copper post and backboard,
Slot milling places special designed gas path device 3 below circuit board.Air passage on-off device in gas path device 3 is solid with flexible glue
It is scheduled on individual platelet, then platelet and backboard punching is screwed.
Due to the SO of measurement2、NO3And O3Gas density is all bigger than air, therefore when present apparatus standing work, it shall be guaranteed that
It is horizontal positioned to measure gas chamber 5.
Cabinet 1 is having a size of 360 (mm) * 300 (mm) * 175 (mm), 1 top panel mounting knob 15 of cabinet, power switch button
16, power supply interface 17 and gas sampling and filtering equipment 4.Handle is convenient for carrying instrument, utilizes special gas sampling and filtering equipment 4
Environmental gas to be measured is acquired, gas sampling and filtering equipment 4 mainly plays a part of to filter dust.
Inner components are put into 1 inside of cabinet and are fixed.In order to radiate to internal unit, installing 4 length and width is all 100
(mm) fan is fixed on two sides in cabinet 1 as radiator, and the two sides inner wall of fan and cabinet 1 is screwed.Finally,
The exterior components such as mounting knob 15, power switch button 16, power supply interface 17.
Gas path device 3 realizes that the sample gas in environment, which is sent into measurement gas chamber 5, to be detected, and the gas after will test
It is discharged in environment again.Radiator is mainly that four fans of cabinet side are kept away for radiating to the device in cabinet 1
It is excessively high to exempt from temperature in cabinet 1.
Measurement gas chamber 5 is used to place gas concentration sensor and gas concentration sensor conditioning circuit, and sample gas is being surveyed
It is reacted in amount gas chamber 5 with gas concentration sensor.Auxiliary tank 6 is used to preheat sample gas, makes sample gas temperature
In suitable measurement range.Environmental gas is pumped in first by auxiliary tank 6, effect is carried out in advance to sample gas
Heat makes sample gas temperature be suitble to the measurement of gas concentration sensor.Heating film is posted in auxiliary tank 6 to add as auxiliary tank
Thermal also placed the temperature and humidity of auxiliary tank Temperature Humidity Sensor measurement auxiliary tank 6, allow temperature in auxiliary tank 6
Degree reaches setting value.After auxiliary tank 6 preheats, sample gas is passed through measurement gas chamber 5 and is measured, sample gas and gas concentration pass
Sensor is reacted in measurement gas chamber 5.Finally, the sample gas after measurement is extracted out.
The present apparatus can place multiple measurement points, and each place measures local gas concentration simultaneously.
The present apparatus uses external power supply mode, and 220V is connected to power interface, then is input to Switching Power Supply by power knob.
Internal Switching Power Supply carries out voltage conversion and respectively powers again to each circuit element.
Data collecting card 2 is that data collecting card 1 and data acquire using the data collecting card of two pieces of Altay USB2089
Card 2.
Specific embodiment two
Present embodiment two and the difference of specific embodiment one are that gas path on-off control device includes the first electricity
Magnet valve 8, the first air pump 9, second solenoid valve 10, the second air pump 11, third solenoid valve 12 and third air pump 13；
The first solenoid valve 8 in parallel and the are equipped between the outlet of gas sampling and filtering equipment 4 and the entrance of auxiliary tank 6
Second solenoid valve 10 and the second air pump in parallel are equipped between one air pump 9, the outlet of auxiliary tank 6 and the entrance of measurement gas chamber 5
11, the outlet for measuring gas chamber 5 is equipped with third solenoid valve 12 and third air pump 13 in parallel；
As shown in figure 4, the entire gas path device 3 in the present apparatus includes 3 solenoid valves, 3 air pumps, 16 and of auxiliary tank
1 measurement gas chamber 5 and gas sampling and filtering equipment 4.When only opening solenoid valve, sample gas is flowed with minimum flow velocity, and is walked
Sample gas flow velocity is changed according to the revolving speed size of air pump when air pump.Because the flow velocity of sample gas is to gas concentration sensor
Measurement has an impact, and can accelerate the gas concentration sensor reaction time when increasing air-flow, but can reduce gas concentration sensor
Sensitivity.It is possible that gas concentration sensor has little time to react with sample gas when low concentration, cause to can't detect sampling gas
Body, it is possible to flow velocity be set as needed.
The electromagnetic valve switch signal output end of data collecting card 2 respectively with the first solenoid valve 8, second solenoid valve 10 and third
Solenoid valve 12 is electrically connected；The air pump speed-regulating signal output end of data collecting card 2 respectively with the first air pump 9, the second air pump 11 and
The air pump speed-regulating signal input terminal of third air pump 13 is electrically connected.
The data collecting card of Altay USB2089 provides 3 road DA output, is adjusted the speed using PWM control air pump, provides 3 road DO
Control the switch of 3 solenoid valves.
Air pump can change the uninterrupted of sample gas to be measured, by sample gas to be measured be pumped into measurement gas chamber 5 into
Row measurement.Air pump requires volume smaller, while can provide enough suction.It can be put into portable cabinet 1, and in order to
Meet power reguirements, needs to select the model of 12V.Nidec brush DC diaphragm pump can be selected, when it is idle when into
Outlet is closed.
Solenoid valve is used to control the on-off of gas path device 3, when closing air pump, opens solenoid valve access, gas is with automatic
The speed of diffusion enters measurement gas chamber 5, when such case applies generally to experiment.Solenoid valve volume needs smaller, Ke Yixuan
With miniature normally open solenoid valve 0520C, its operating voltage is 12V, operating current 45mA, meets system requirements.
It is a brshless DC motor inside Nidec brush DC diaphragm pump, 12V powers, and power 4W is adopted using data
The revolving speed for the DA output signal control air pump that truck USB2089 is provided.
Air pump controls revolving speed using PWM wave, to control the size of air-flow.As shown in figure 5, TL494 chip is a kind of frequency
The fixed pulse-width modulation circuit of rate, is generally used for the control of Switching Power Supply.The frequency of internal linear saw tooth wave oscillator is
It is determined by the capacitor of pin CT and the resistance of RT:
Pin 1IN- is connect with FEEDBACK makes one feedback PWM comparator of its Inner Constitution.Output control pin 13
Low and high level determine selection the way of output: when setting high level, using push-pull operation；When setting low level, use is single-ended
Type pulsewidth modulation.Here level is set low.The DA value of data collecting card 2 is given to 1IN+ input pin, in E1 and E2 two pins
Identical PWM wave is exported, their duty ratio is determined by the size of DA value.
The power of TL494 is smaller, cannot directly drive air pump, can use L293 driving chip driving air pump.Such as Fig. 6 institute
Show, L293 is a kind of single chip integrated high voltage, 4 road half-bridge drive circuit of high current, is suitble to driving inductive load (such as relay
Pipe, direct current and stepper motor) and Switching Power Supply transistor.Enable end EN controls the enabled of OUT, and high level is enabled.Input terminal IN
Level determine the level height of the output end OUT corresponding to it, IN1 corresponds to OUT1, other and so on.
By taking pump1-pwm as an example, pump1-pwm connects air pump pwm signal line, and OUT2 pin connects the ground of air pump, air pump power supply
Line meets 12V.When working normally, pwm signal is output to enable end EN, and output signal pump1-pwm output is with PWM with frequency
The square-wave signal driving air pump work of rate, phase and duty ratio.
Solenoid valve uses the miniature normally open solenoid valve of 0520C, its operating voltage is 12V, operating current 45mA, pressure limit
0-350mmhg.Solenoid valve is driven using TLP152 opto-coupler chip, and driving circuit for electromagnetic valve is as shown in Figure 7.
TLP152 optocoupler peak anode current is ± 2.5A, and operating voltage VCC is 10V to 30V, and isolation voltage BVs is
3750Vrms, meet demand.Optocoupler is by optical signal come transmission telecommunications number, and input terminal is light-emitting component (such as light-emitting diodes
Pipe), receiving end is light-sensitive element (such as photosensitive semiconductor).Input terminal A is pulled to 5V by resistance, when DO signal is low level
When, the work of internal illumination device emits beam, and photosensitive semiconductor is connected after receiving light, is given to electricity to the end EMO to connect 12V
Magnet valve.
Specific embodiment three
Present embodiment three and the difference of specific embodiment one or two be, gas concentration sensor conditioning circuit
Including gas concentration sensor and gas concentration sensor adding thermal resistance；
The gas concentration signal input terminal of data collecting card 2 and the gas concentration signal output end electricity of gas concentration sensor
The heating signal input terminal of gas connection, heating signal output end and gas concentration sensor adding thermal resistance is electrically connected.
Specific embodiment four
Present embodiment four and the difference of specific embodiment three are that gas concentration sensor includes carbon monoxide
CO gas concentration sensor, nitrogen dioxide NO2 gas concentration sensor, ozone O3 gas concentration sensor and sulfur dioxide SO2
Gas concentration sensor.
For CO gas concentration sensor, NO2Gas concentration sensor and O3Three kinds of gas concentrations of gas concentration sensor pass
Sensor, they belong to conductor oxidate type gas concentration sensor.
As shown in figure 8, can be considered as 50 Ω's of resistance value or so between 1,3 pins in figure by taking CO gas concentration sensor as an example
Adding thermal resistance, it is heating up for acting on, and provides the operating temperature of sensor.CO gas concentration sensor heated current generally exists
95mA or so, NO2And O3Heated current is in 35mA or so；2, the sensitive resistance Rs of mega-ohms, its resistance can be considered as between 4 pins
Value can change with the variation of CO gas concentration, and concentration gets over that high value is smaller, and the lower concentration the bigger.But circuit can only acquire
Voltage signal, therefore sensitive resistance is connected partial pressure with resistance similar in resistance value, acquire divider resistance both end voltage.CO gas
Concentration sensors output signal sensor1 calculation formula:
For SO2Gas concentration sensor, it belongs to solid electrolyte type sensor.
As shown in figure 9, SO2It can be equivalent to the heating electricity of 3 Ω of resistance value or so between 2,3 pins of gas concentration sensor
Resistance, effect are also to provide operating temperature, SO2Gas concentration sensor needs the heated current of 350mA or so when working normally.
Because heating signal is provided by the DA of data collecting card 2, its power is smaller cannot to drive heating well.Here it can adopt
5V is provided with one end, one end provides electric current to adding thermal resistance to the mode of heating signal heater.
With CO gas concentration sensor, NO2Gas concentration sensor and O3Gas concentration sensor is different, SO2Gas concentration
Sensor can directly be exported with SO2The differential voltage signal of gas concentration variation and variation.Therefore, gas concentration sensor tune
Managing circuit further includes SO2Sensor signal differential amplifier circuit, LM285D-1.2V voltage bias.
As shown in Figure 10, differential amplifier circuit selects integrated instrument amplifier AD623 chip, the AD output of output pin 6
Calculation formula:
VAD=(VOUT+-VOUT-)*G+1.2V (3)
Its amplification factor G range changes amplification factor between 1~1000, by adjusting the size of resistance R10, counts
Calculate formula:
G=1+ (100K/RG) (4)
Due to SO2There are baseline voltages for gas concentration sensor, are probably positive and negative tens millivolts, in order to guarantee output electricity
In addition pressure both greater than zero, need to provide the bias voltage (being provided by LM285D-1.2V) of 1.2V.
In order to guarantee to measure the good air-tightness of gas chamber 5, covered around all gas concentration sensor net caps upper soft
Cushion rubber, when covering the lid of measurement gas chamber 5, cushion rubber is compressed the gap filled up sensor and measured 5 inner hole of gas chamber.
Device drive circuit includes the adding thermal resistance driving circuit and air pump driving circuit, solenoid valve of gas concentration sensor
The equipment such as driving circuit.Since the driving capability of the data collecting card of Altay USB2089 is weaker, output electric current is small, and power is small,
Need driving circuit to control signal drive amplification.
To gas sensitivity highest when requiring heat to certain temperature due to gas concentration sensor, so needing in gas
Adding thermal resistance is carried on concentration sensor.The driving signal of adding thermal resistance is exported by the DA of data collecting card USB2089.
CO gas concentration sensor, NO2Gas concentration sensor and O3Gas concentration sensor belongs to conductor oxidate
Type gas concentration sensor, their adding thermal resistance driving circuit figure is as shown in figure 11, and main includes the LM224AD voltage of front
Follower and subsequent BD135 triode drive amplification.Capture card DA inputs the positive input of emitter following, and emitter following is exported through three poles
Pipe feeds back to emitter following reverse input end.Using the short characteristic of void of operational amplifier, both ends input voltage is identical, ensure that capture card
DA value with supply the heating voltage heater value of adding thermal resistance it is equal.
In this circuit arrangement, the size and DA value, LM224AD supply voltage, transistor base of heating voltage heater are exported
Resistance and triode supply voltage have relationship.Output maximum voltage can reach 5V, meet necessary requirement.
SO2Gas concentration sensor belongs to solid electrolyte type gas concentration sensor, its heated current needs 350mA
Left and right, it is relatively high to the requirement that electric current is constant, as shown in figure 12, constant current driving can be carried out using DD311 chip.DD311
The OUT pin electric current of chip determines by the electric current of REXT pin, corresponding OUT pin electric current calculation formula:
Iout≈100*(VDA-VREXT)/R18(ohm)=100*IREF(A) (5)
The DA of data collecting card USB2089 inputs LM224AD voltage follower, prevents post-stage drive circuit from acquiring to data
Card impacts.The electric current IREF for flowing through resistance R18 can be calculated according to DA value and REXT pin voltage.It is special by DD311 chip
Property it is found that branch current where pin OUT is 100 times of IREF, this electric current is output to SO2 sensor adding thermal resistance.In turn
The DA value size that data collecting card needs to set can be calculated according to required working sensor electric current.
Gas concentration sensor conditioning circuit is each attached on conditioning plate, and conditioning plate is set in measurement gas chamber 5, on conditioning plate
All sensor signals and heating signal all pass through 50 needle interfaces and connect with device drive circuit.
Specific embodiment five
Present embodiment five and the difference of specific embodiment four be, CO gas concentration sensor, NO2Gas is dense
Spend sensor, O3The quantity of gas concentration sensor and SO2 gas concentration sensor is three.
Specific embodiment six
Present embodiment six and the difference of specific embodiment one are that thermostatically-controlled equipment 7 is semiconductor refrigerating
Piece, the chill surface of semiconductor cooler TEC is close to measurement 5 lateral wall of gas chamber.
In order to guarantee the stability of gas concentration sensor measurement, need to control the temperature of sample gas in measurement gas chamber 5
Using thermostatic control.Since gas concentration sensor operational heat can cause the rising for measuring temperature in gas chamber 5, it is not required to using special
Door heating module heating.
Therefore it can use semiconductor cooler TEC to cool down to gas chamber, using model TEC1-7104.TEC is temperature
Controlling element is spent, the size and Orientation by adjusting input current still heats adjusting refrigeration and the speed of refrigeration or heating
Degree.
The important technological parameters of the refrigerator of the TEC1-7104 are as follows:
1.50-1.70 Ω of resistance value (23 ± 1 DEG C of environment temperature, 1kHzAC test)；Operating current: 4.0A；Maximum voltage:
8.4VDC；Maximum cooling power: 21W；Operating ambient temperature range: -55-80 DEG C.
Specific embodiment seven
Present embodiment seven and the difference of specific embodiment six are that the heating surface of thermostatically-controlled equipment 7 is equipped with
Thermostatically-controlled equipment radiator fan 14, the thermostatically-controlled equipment radiated signal input terminal of the thermostatically-controlled equipment radiator fan 14
It is electrically connected with the thermostatically-controlled equipment radiated signal output end of data collecting card 2.
Because TEC is chill surface on one side when working, another side is heating surface, so also specially plus a permanent in heating surface
Temperature control device radiator fan 14 cools down to it, avoids TEC temperature excessively high.
As shown in Figure 13 and Figure 14, thermostatically-controlled equipment radiator fan 14 and TEC use SSR solid-state relay D0111-
14L driving, control signal are exported by the DO of data collecting card 2 and are provided.The DO of capture card data collecting card 2 is given to relay input
Pin IN+ controls the connection of relay output end, to control temperature control device radiator fan 14 or the work of TEC.
Specific embodiment eight
Present embodiment eight and the difference of specific embodiment one are, measure and are additionally provided with temperature and humidity pressure biography in gas chamber 5
Sensor, the measurement gas chamber temperature and humidity pressure signal output end of the warm and humid pressure sensor and the measurement gas chamber temperature and humidity pressure of data collecting card 2 are believed
Number input end electrical connection.
The environmental gas concentration data acquisition device of the utility model can be realized constant temperature and the display pollution of measurement gas chamber 5
Sample gas concentration information etc..It needs to acquire the environmental gas concentration data of the utility model by data collecting card 2
The collected gas concentration information of device institute is transferred to remote monitoring platform and is further processed.
The present apparatus can be used for measuring four kinds of polluted gas, and every kind of gas concentration sensor can have 3, totally 12 sensings
Device needs 12 road A/D to acquire；Corresponding 12 tunnel gas concentration sensor heat driven circuit Ye You exports heating letter by D/A
Number；Whether correct in order to detect the heating signal provided, 12 road A/D of Hai Xu acquires gas concentration sensor fire end voltage；Separately
Outside, temperature and humidity measurement needs 4 road A/D using simulation temperature and humidity module in cabinet 1 and auxiliary tank 6；Air pump utilizes PWM
Control speed regulation, needs 3 road DA to export；The switch of 3 solenoid valves needs 3 road DO.
To sum up, 28 road AD, 15 road DA, 3 road DO are needed in total, therefore select two pieces of Altay USB2089 data collecting cards
Complete the above work.
Claims (8)
1. environmental gas concentration data acquisition device, including cabinet (1), which is characterized in that further include that data collecting card (2) is gentle
Road device (3)；
It is fixed in cabinet (1) outside data collecting card (2) and gas path device (3), cabinet (1) and is fixed with gas sampling filtering dress
Set (4)；Gas path device (3) includes measurement gas chamber (5), auxiliary tank (6) and air passage on-off device, gas sampling and filtering equipment
(4), auxiliary tank (6) and measurement gas chamber (5) are sequentially communicated and constitute sample gas detection path, sample gas can successively pass through
Cabinet (1) is discharged afterwards in gas sampling and filtering equipment (4), auxiliary tank (6) and measurement gas chamber (5)；
Gas is equipped between gas sampling and filtering equipment (4) and auxiliary tank (6), between auxiliary tank (6) and measurement gas chamber (5)
Road on-off system；The gas path on-off signal output end of data collecting card (2) and the gas path on-off signal of air passage on-off device export
End electrical connection；
Auxiliary tank heating device and auxiliary tank Temperature Humidity Sensor are equipped in auxiliary tank (6)；Data collecting card (2) it is auxiliary
The auxiliary tank heating signal input terminal of gas chamber heating signal output end and auxiliary tank heating device is helped to be electrically connected；Data are adopted
The auxiliary tank temperature-humidity signal input terminal of truck (2) and the auxiliary tank temperature-humidity signal of auxiliary tank Temperature Humidity Sensor are defeated
Outlet electrical connection；
It measures and is equipped with gas concentration sensor conditioning circuit, the gas concentration signal input terminal of data collecting card (2) in gas chamber (5)
With the electrical connection of gas concentration signal output end, conditioned signal output end and the gas concentration of gas concentration sensor conditioning circuit
The conditioned signal input terminal of Conditioning Circuits of Sensor is electrically connected；
Measurement gas chamber (5) lateral wall is fixed with thermostatically-controlled equipment (7)；The thermostatic control signal output end of data collecting card (2)
It is electrically connected with the input terminal of the thermostatic control signal of thermostatically-controlled equipment (7).
2. environmental gas concentration data acquisition device according to claim 1, which is characterized in that gas path on-off control device
Including the first solenoid valve (8), the first air pump (9), second solenoid valve (10), the second air pump (11), third solenoid valve (12) and
Three air pumps (13)；
Be equipped between the outlet of gas sampling and filtering equipment (4) and the entrance of auxiliary tank (6) the first solenoid valve (8) in parallel and
Second solenoid valve (10) in parallel is equipped between first air pump (9), the outlet of auxiliary tank (6) and the entrance of measurement gas chamber (5)
Outlet with the second air pump (11), measurement gas chamber (5) is equipped with third solenoid valve (12) and third air pump (13) in parallel；
The electromagnetic valve switch signal output end of data collecting card (2) respectively with the first solenoid valve (8), second solenoid valve (10) and
Three solenoid valves (12) electrical connection；The air pump speed-regulating signal output end of data collecting card (2) respectively with the first air pump (9), second
The electrical connection of the air pump speed-regulating signal input terminal of air pump (11) and third air pump (13).
3. environmental gas concentration data acquisition device according to claim 1 or 2, which is characterized in that gas concentration sensing
Device conditioning circuit includes gas concentration sensor and gas concentration sensor adding thermal resistance；
The gas concentration signal input terminal of data collecting card (2) and the gas concentration signal output end of gas concentration sensor are electrical
The heating signal input terminal of connection, heating signal output end and gas concentration sensor adding thermal resistance is electrically connected.
4. environmental gas concentration data acquisition device according to claim 3, which is characterized in that gas concentration sensor packet
Include carbon monoxide CO gas concentration sensor, nitrogen dioxide NO2Gas concentration sensor, ozone O3Gas concentration sensor and two
Sulfur oxide SO2Gas concentration sensor.
5. environmental gas concentration data acquisition device according to claim 4, which is characterized in that CO gas concentration sensing
Device, NO2Gas concentration sensor, O3Gas concentration sensor and SO2The quantity of gas concentration sensor is three.
6. environmental gas concentration data acquisition device according to claim 1, which is characterized in that thermostatically-controlled equipment (7)
For semiconductor cooler TEC, the chill surface of semiconductor cooler TEC is close to measurement gas chamber (5) lateral wall.
7. environmental gas concentration data acquisition device according to claim 6, which is characterized in that thermostatically-controlled equipment (7)
Heating surface be equipped with thermostatically-controlled equipment radiator fan (14), the thermostatically-controlled equipment of the thermostatically-controlled equipment radiator fan (14)
The thermostatically-controlled equipment radiated signal output end electrical connection with data collecting card (2) of radiated signal input terminal.
8. environmental gas concentration data acquisition device according to claim 1, which is characterized in that in measurement gas chamber (5) also
Equipped with warm and humid pressure sensor, the measurement gas chamber temperature and humidity pressure signal output end of the warm and humid pressure sensor and the survey of data collecting card (2)
Measure gas chamber temperature and humidity pressure signal input end electrical connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821684414.0U CN208872737U (en) | 2018-10-17 | 2018-10-17 | Environmental gas concentration data acquisition device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821684414.0U CN208872737U (en) | 2018-10-17 | 2018-10-17 | Environmental gas concentration data acquisition device |
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| Publication Number | Publication Date |
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| CN208872737U true CN208872737U (en) | 2019-05-17 |
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ID=66470328
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| CN201821684414.0U Expired - Fee Related CN208872737U (en) | 2018-10-17 | 2018-10-17 | Environmental gas concentration data acquisition device |
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| Country | Link |
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| CN (1) | CN208872737U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112067522A (en) * | 2020-10-12 | 2020-12-11 | 北京雨根科技有限公司 | Air negative ion sensor and measuring method |
| CN113671119A (en) * | 2021-08-02 | 2021-11-19 | 德尔格安全设备（中国）有限公司 | Gas detection device and temperature compensation method thereof |
| CN114019116A (en) * | 2022-01-10 | 2022-02-08 | 云图启迪(南京)科技有限公司 | Gas monitoring devices is pressed in controllable control by temperature change |
-
2018
- 2018-10-17 CN CN201821684414.0U patent/CN208872737U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112067522A (en) * | 2020-10-12 | 2020-12-11 | 北京雨根科技有限公司 | Air negative ion sensor and measuring method |
| CN113671119A (en) * | 2021-08-02 | 2021-11-19 | 德尔格安全设备（中国）有限公司 | Gas detection device and temperature compensation method thereof |
| CN114019116A (en) * | 2022-01-10 | 2022-02-08 | 云图启迪(南京)科技有限公司 | Gas monitoring devices is pressed in controllable control by temperature change |
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