CN106324047A - Catalytic combustion sensor work life assessment device and method - Google Patents
Catalytic combustion sensor work life assessment device and method Download PDFInfo
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- CN106324047A CN106324047A CN201510388821.1A CN201510388821A CN106324047A CN 106324047 A CN106324047 A CN 106324047A CN 201510388821 A CN201510388821 A CN 201510388821A CN 106324047 A CN106324047 A CN 106324047A
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Abstract
The invention discloses a catalytic combustion sensor work life assessment device and method. The device comprises a gas concentration control unit, an accelerated aging test unit, a sensor signal processing unit and a life assessment unit. The gas concentration control unit is connected to the accelerated aging test unit. The sensor signal processing unit is installed in the accelerated aging test unit. The sensor signal processing unit is connected to the life assessment unit. The life assessment unit is arranged outside the accelerated aging test unit and is connected to the accelerated aging test unit. The catalytic combustion sensor work life assessment device and method can realize accurate catalytic combustion sensor work life assessment.
Description
Technical field
The present invention relates to a kind of catalytic combustion sensor working life apparatus for evaluating and appraisal procedure, especially
It is directed to the working life assessment of the catalytic combustion sensor of industry spot detection fuel gas.
Background technology
Catalytic combustion sensor in industry spot use predominantly detects the concentration of fuel gas.Product is defeated
Going out signal linear with imflammable gas concentration to be measured, detection range is typically 0～100%LEL
In (low explosive limit, LEL).It is catalysis combustion system due to take, urges
Agent is in industrial environment, and along with using time lengthening, catalysis activity can be gradually lowered, and shows product
It is exactly that under same gas concentration, output signal is gradually reduced on product.Product output signal and gas to be measured
The ratio of concentration is referred to as sensitivity, the sensitivity of catalytic combustion sensor, can be with use time lengthening
Reduce.The signal to noise ratio necessary for ensureing sensor output signal, the most all can set a least sensitive
Bottom valve value (referred to as S2), is accomplished by the sensor more renewed less than this value.Sensor is by the sensitiveest
Degree (referred to as S1), is reduced to the use time corresponding to S2, and referred to as sensor service life is (referred to as
T).The catalytic combustion sensor of any model, the product of the most same model different batches,
Before industry spot uses, it is necessary to its working life is made assessment reliably, it is simple to sensor is the most more
Change, it is ensured that personnel and the safety of equipment.The present invention is aiming at the working life of catalytic combustion sensor
Propose a kind of catalytic combustion sensor working life apparatus for evaluating and appraisal procedure.
Summary of the invention
The technical problem to be solved is to provide a kind of catalytic combustion sensor working life and comments
Estimate device and appraisal procedure, it is possible to accurately catalytic combustion sensor is carried out life appraisal.
A kind of catalytic combustion sensor working life apparatus for evaluating disclosed by the invention and appraisal procedure, adopt
Technical scheme as follows:
Including gas concentration control unit, accelerated ageing test cell, sensor processing unit,
Life appraisal unit: gas concentration control unit is connected with accelerated ageing test cell, sensor is believed
Number processing unit is arranged in accelerated ageing test cell, sensor processing unit and life appraisal
Unit is connected, and life appraisal unit is in outside accelerated ageing test cell, and is attached thereto, overall
Structural representation is as shown in Figure 1.
Gas concentration control unit includes: the fuel gas of 100% concentration of one bottle of band air relief valve, one
The adjustable suspended body flowmeter of flow, the electromagnetic valve of a 2/2-way Direct Action Type closed type, fix for one
Formula combustible gas detector, a power module.
Fixed combustible gas detector includes: a detector gauge outfit and a flame proof probe, flame proof
Probe and detector gauge outfit are structurally separated, electrical connection, and detector gauge outfit supplies to flame proof probe
Electricity, passes through bus communication between the two.Installation infrared sensor in flame proof probe, infrared sensor is surveyed
Weight range is from 0～100% fuel gas of concentration, and certainty of measurement exceeds catalytic combustion sensor one number
Magnitude, the stability of output signal in air and fuel gas, it is better than catalytic combustion sensor at least
More than 10 times, it is preferable that use Britain Dynament infrared fuel gas Premier series of IR
Sensor.Flame proof probe is arranged in accelerated ageing test cell, and detector gauge outfit is arranged on acceleration
Outside burn-in test unit.
Detector gauge outfit comprises an ARM single-chip microcomputer, a relay, can set in instrument firmware
Two warning concentration, one of them is low concentration warning (referred to as Alarm Low, AL), and one is high
Concentration is reported to the police (referred to as Alarm High, AH), and fixed combustible gas detector detects that gas is dense
Degree reach warning concentration, relay will action, or adhesive conducting or separate open circuit；
The flame proof probe of fixed combustible gas detector comprises a Britain Dynament's
The infrared sensor of Premier series, one piece of analog signal conditioner pcb board, pcb board comprises one
Mixed-signal processor MSP430 (Mixed Signal Processor), A/D therein conversion is logical
Road, by the voltage signal of the expression gas concentration that infrared sensor produces, is changed into and becomes with gas concentration
The digital signal of linear scale, and by bus, this digital signal is concentrated on the ARM of detector gauge outfit
On single-chip microcomputer.
Power module input 220V 50Hz alternating current, exports 24V 1A unidirectional current, gives fixing respectively
Formula combustible gas detector and solenoid valve.The adjustable suspended body flowmeter of flow, tank-volumes 24
When rising, suspended body flowmeter flow controllable is 50 persons of outstanding talent liter/min.
Gas concentration control unit structural representation is as shown in Figure 2: circuit is by power module, relay
Device and electromagnetic valve constitute a loop, and when ARM Single-chip Controlling relay adhesive, relay turns on,
Whole loop turns on, and power module powers on to electromagnetic valve, the air circuit breaker conducting that electromagnetic valve controls.Gas
Road is fuel gas in gas cylinder, by suspended body flowmeter current limliting, through electromagnetic valve, enters accelerated ageing
Test cell.
Accelerated ageing test cell includes: an airtight lucite test box, two fans, one
Hygrothermograph, a digital display manometer, a pressure leakage port, an aviation plug, a gas
Concentration control unit air inlet, a life appraisal unit air inlet.
The lucite test box of accelerated ageing test cell, lucite wall thickness more than 15 millimeters,
Using rectangular structure, upper cover plate is detachable.Upper cover plate uses polytetrafluoroethylene sealing gasket sheet with casing
Sealing, screw hole is evenly distributed on lucite wall, the screw running through upper cover plate compress and seal.Case
Body volume is determined by number of sensors to be measured, the most simultaneously 8 sensors of test, box house size
400 × 300 × 200 millimeters.Accelerated ageing test box planar structure schematic diagram is as shown in Figure 3.
Two fans in accelerated ageing test box, use intrinsic safety explosion-proof, are mounted opposite at wall box,
Operative orientation is parallel, and stagger distance as far as possible, and with gas concentration control unit and life appraisal unit
Air inlet is vertical, is quickly mixed with air by fuel gas.
Hygrothermograph in accelerated ageing test box, uses intrinsic safety explosion-proof, small size size, and battery supplies
Electricity, measures temperature range-30 DEG C～100 DEG C, measures humidity range 0～100%RH.
Digital display manometer in accelerated ageing test box, uses intrinsic safety explosion-proof, small size size, battery
Power supply, measures pressure limit 0～0.05MPa.
Pressure leakage port in accelerated ageing test box, equipped with Spring-Loaded Pressure Relief Valve, vent pressure is preferably
0.1MPa, it is possible to releasing pressure automatically ensures safety.
Aviation plug in accelerated ageing test box, powers to parts all in case, gives and needs with outside
The parts of data communication provide electrical connection.Aviation plug ensure the airtight flame proof of electric connecting joint, core number by
Number of sensors to be measured determines, preferably by the 24 straight plugs of core, socket four eyed flange is installed.
Two air inlets in accelerated ageing test box, preferably by bite type straight through plate pipe joint, material
Matter is Stainless steel 316, and gas circuit uses 4 millimeters of stainless steel tubes of diameter or Teflon hard tube.
Sensor processing unit circuit theory diagrams as shown in Figure 4, including one piece of sensor
Analogue signal extracts circuit board, and a sensor analog signals processes circuit.Sensor analog signals carries
Sense circuit plate, can install 8 catalytic combustion sensor simultaneously, and sensor analog signals extracts circuit board
There are three parts: (1) 8 rounded sensor analog signals that is evenly distributed on of sensor extracts circuit
The surrounding of plate, it is sensor signal processing circuit that sensor analog signals extracts the central authorities of circuit board, electricity
Power supply chip in road provides fixing running voltage to each sensor；(2) two electricity that resistance is identical
Resistance constitutes a brachium pontis of Wheatstone bridge, the catalysis (black) of sensor and reference (in vain) element structure
Become another brachium pontis.The black-and-white component of 8 sensors is respectively a brachium pontis, shares resistance brachium pontis, structure
Become 8 Wheatstone bridges.Sensor black-and-white component brachium pontis, electric current first passes through white element, then through black
Element, is connected to ground；(3), in Wheatstone bridge, the mid-point voltage of black-and-white component brachium pontis is designated as VC,
The mid-point voltage of resistance brachium pontis is designated as VR, and the output signal of sensor is pressed VC-VR and calculated；
Sensor signal processing circuit includes two parts: the power supply section of (1) power supply chip TPS76333
Point, externally fed is converted into working sensor voltage, the fortune simultaneously divided to signal amplifying part by this chip
Calculation amplifier is powered；(2) modulate circuit part, operational amplifier TLV2461 differential amplification favour stone
Electric bridge input signal, the analogue signal after amplification is transferred to life appraisal unit.
Life appraisal unit includes: the calibrating gas of two bottles of band air relief valve, and one bottle is high pure air, one
Bottle is the fuel gas of 50%LEL concentration, and a manual T-shaped tee ball valve, a flow is adjustable
Suspended body flowmeter, the desktop computer of a band I/O expansion slot, the data acquisition of a pci interface
Card, a set of data acquisition/storage/display software.Manual T-shaped tee ball valve in life appraisal unit,
Material is 316 rustless steels, it is possible to realized cutting between high pure air and 50%LEL fuel gas in 1 second
Change.The adjustable suspended body flowmeter of flow in life appraisal unit, during tank-volumes 24 liters, float
The flow controllable of effusion meter is 5 liters/min.
Data collecting card in life appraisal unit, inserts in the I/O expansion slot of PC mainboard, with
Pci bus mode accesses, and gathers the voltage analog signal of sensor processing unit input.Preferably
Ground, data collecting card port number is single-ended 16 tunnels/difference 8 tunnel, sample frequency 1M, resolution 16
Position, precision is the 0.05% of full scale, range 0～5V.Data acquisition in life appraisal unit/
Store/display software, it is preferable that can setting data acquisition condition, when start and terminate sample/
Sample frequency/record time/number of active lanes etc., it is possible to realize more than 12 hours voltage analog input letters
Number data record, data export function support multiple file format, such as: Microsoft Excel,
NI LabVIEW and MathWorks MATLAB etc..The schematic diagram of life appraisal unit is as shown in Figure 5.
Whole catalytic combustion sensor working life appraisal procedure, first secondary standard operating procedure is as follows:
1. being arranged in forced ventilation environment, such as fume hood by whole system device, ambient temperature and humidity is permanent
It is scheduled between 20～25 DEG C of@40～60%RH；
2. the catalytic combustion sensor treating life appraisal is arranged on sensor analog signals and extracts circuit
On plate；
3. power on to all unit of whole system；
4. the infrared sensor of gas concentration control unit is demarcated；
5. allow catalytic combustion sensor preheat 10 minutes, then cover accelerated ageing test box upper cover,
Do not add screw to compress；
6. opening the high pure air gas cylinder air relief valve of life appraisal unit, manual switching three-way valve is to high-purity
Air, is passed through high pure air to accelerated ageing test box, regulates flow by suspended body flowmeter
5 liters/min, observe digital display manometer in accelerated ageing test box, it is ensured that casing internal gas pressure
In catalytic combustion sensor service pressure scope；
7. observe the infrared sensor measurement data of gas concentration control unit, it is ensured that combustible gas in casing
Bulk concentration is zero；
8. open the data acquisition/storage/display software in life appraisal unit, combustion sensing to be catalyzed
After device stable output signal in atmosphere, start to record data；
9. open the 50%LEL fuel gas gas cylinder air relief valve of life appraisal unit, band software records 1
After minute, manual switching three-way valve to 50%LEL fuel gas, by software continuous record/
Storage sensors output signal, until signal stabilization is recorded number of times infrared sensor concentration and is read
Number；
10. the software in end-of-life assessment unit；
11. manual switching three-way valve, to high pure air, are passed through high pure air to accelerated ageing test box, stream
Measure 5 liters/min, observe the infrared sensor measurement data of gas concentration control unit, protect
In card casing, combustable gas concentration reverts to zero；
12. air relief valve cutting out two gas cylinders of life appraisal unit, are then shut off the floating of life appraisal unit
Subflow gauge；
Cover-use screw on accelerated ageing test box is compressed by 13.；
The 14. 100% concentration combustible gas gas cylinder air relief valve opening gas concentration control unit；
15. suspended body flowmeters opening gas concentration control unit, treat that relay is connected, electromagnetic valve action
During gas circuit conducting, regulation charge flow rate 50 person of outstanding talent liter/min；
As need to measure catalytic combustion sensor current sensitivity spend time, operating procedure is as follows:
1. close 100% concentration combustible gas gas cylinder air relief valve of gas concentration control unit；
2. close the suspended body flowmeter of gas concentration control unit；
3. unclamp the screw of life appraisal test box upper cover；
Run the 6th step in first secondary standard operating procedure to the 15th step；
It is as follows that gas concentration control unit controls the principle of combustable gas concentration in accelerated ageing test box:
Predictive sensor service life, design the accelerated ageing testing time, by the former divided by the latter, really
Determine accelerated ageing concentration factor α.According to actual industrial environment, the common concentration C of fuel gas 1 (detection
The warning mean concentration of instrument record), and α and accelerated ageing test concentrations corresponding relation (by
Experiment determines, after be described in detail), determine the combustable gas concentration of accelerated aging tests.
In accelerated ageing test box, combustable gas concentration does not exceeds 70%LEL in principle, except ensureing test
Outside safety, also need to prevent in particular cases concentration overload from sensor is caused damage.Old to accelerate below
Change explanation as a example by concentration 50%LEL.
Combustible gas detector, low concentration alarm point (referred to as Alarm Low, AL) is set as 49%LEL,
High concentration alarm point (referred to as Alarm High, AH) is set as 50%LEL.Detector relay
Working condition is: connect less than 49%LEL, disconnects higher than 50%LEL.
When in life appraisal test box, combustable gas concentration is less than 49%LEL, relay is connected, electricity
Magnet valve powers on, and gas circuit turns on, and 100% concentration combustible gas is passed through survey with the low discharge of 50 ml/min
Examination case, by the rapid mix homogeneously of fan.When in test box, combustable gas concentration reaches 50%LEL,
Relay disconnects, circuit breaker, electromagnetic valve power-off, and gas circuit is ended.Now due to gas circuit hysteresis effect,
In test box, combustable gas concentration still can slightly rise, by regulation effusion meter flow, and can be by the most highly concentrated
Angle value controls in 51%LEL.During whole concentration controls, combustable gas concentration is 49～51%LEL
In the range of, with sine wave change in oscillation.
Must there be scope, otherwise a relay frequent movement between C1 and C2, cannot effectively control on the contrary
Concentration processed.According to the industry of GB GB15322.1 combustible gas probe part 1 and commercial use
In combustible gas probe, measuring the gas detector that scope is 3～100%LEL, range instruction is partially
Difference is at ± 5%LEL, and in this service life evaluation system, the fluctuation range of combustable gas concentration ± 1%LEL is permissible
Accept.
The present invention has the advantages that relative to prior art
Catalytic combustion sensor residual Life Calculation method based on native system:
1. catalytic combustion sensor sensitivity computing method:
Output signal-V1 in air
Output signal-V2 in fuel gas
Combustable gas concentration-C
Transducer sensitivity-S
S=(V2-V1)/C
2. catalytic combustion sensor Life Calculating Methods:
The confirmation of 2.1 accelerated ageing gas concentration factor alpha
Sensor initial sensitivity-S1
Sensor sensitivity minimization threshold values-S2
In actual industrial environment, fuel gas common concentration-C1
Combustable gas concentration-the C2 of high concentration accelerated ageing
Experiment one: C1 concentration under, the same batch sensor of same model, in the present system 24 hours not between
Disconnected aging, sensitivity is reduced to the time needed for S2 by S1, is designated as T1；
Experiment two: C2 concentration under, the same batch sensor of same model, in the present system 24 hours not between
Disconnected aging, sensitivity is reduced to the time needed for S2 by S1, is designated as T2；
Then accelerated ageing gas concentration factor alpha=T1/T2；
The confirmation of 2.2 accelerated ageing time interval factor beta
In actual industrial environment, in 24 hours, there is the average frequency (detector alarm times) in fuel gas
-N
In actual industrial environment, in 24 hours, fuel gas occurs that (detector was reported to the police and continued average time
Time)-T3
Then: in actual industrial environment, the time m-T4=N that in 24 hours, detector is exposed in fuel gas
×T3
Under experiment three: C2 concentration, the same batch sensor of same model, old in 24 hours in the present system
The change T4 time (is controlled C2 concentration by gas concentration control unit, residual life evaluation unit ensures
Pure air atmosphere), sensitivity is reduced to the time needed for S2 by S1, is designated as T5；
Then accelerated ageing time interval factor beta=T5/T2；
The confirmation of 2.3 life-span T
T=T2 × α × β；
Actual industrial environment is often complicated severe, and gaseous species more than one fuel gas also has each
Plant poisonous/interference gas.If able to confirm the most poisonous/interference kind of gas and concentration, can be by
In native system, 100% concentration combustion gas body of gas concentration control unit, and life appraisal unit
50%LEL concentration combustible gas, allocates poisonous/interference gas into, it is possible to enter more accurately the most in proportion
Row life appraisal.
Accompanying drawing explanation
Fig. 1 shows for the overall structure of the catalytic combustion sensor working life apparatus for evaluating that the present invention provides
It is intended to.
Fig. 2 is the structural representation of gas concentration control unit.
Fig. 3 is the structural representation of accelerated ageing test cell.
Fig. 4 is sensor processing unit circuit theory diagrams.
Fig. 5 is the structural representation of life appraisal unit.
In figure:
1 gas concentration control unit 2 accelerated ageing test cell 3 sensor signal
Processing unit
4 life appraisal unit 11 detector gauge outfit 111 ARM monolithics
Machine
112 relay 12 alternating current power supply 121 circuit
13 flame proofs are popped one's head in 131 mixed-signal processor 132 infrared ray
Sensor
14 Aviation Connector 15 gastight joint 16 electromagnetic valves
17 power module 18 suspended body flowmeter 19 fuel gas
191 gas circuit 21 gas concentration control unit air inlet 22 aviation plugs
23 pressure leakage port 24 fan 25 screws
26 digital display manometer 27 Hygrothermograph 28 life appraisal lists
Unit's air inlet
31 sensor signal processing circuit 32 sensor 41 accelerated ageings
Test box
42 high pure air 43 fuel gas 44 display screens
45 cabinets
Detailed description of the invention
The invention will be further described with embodiment below in conjunction with the accompanying drawings.
A kind of catalytic combustion sensor working life apparatus for evaluating disclosed by the invention and appraisal procedure, adopt
Technical scheme as follows:
Including gas concentration control unit 1, accelerated ageing test cell 2, sensor signal processes single
Unit 3, life appraisal unit 4: gas concentration control unit 1 is connected with accelerated ageing test cell 2
Connecing, sensor processing unit 3 is arranged in accelerated ageing test cell 2, at sensor signal
Reason unit 3 is connected with life appraisal unit 4, and it is single that life appraisal unit 4 is in accelerated ageing test
Outside unit 2, and being attached thereto, overall structure schematic diagram is as shown in Figure 1.
Gas concentration control unit 1 includes: the fuel gas 43 of 100% concentration of one bottle of band air relief valve,
One adjustable suspended body flowmeter of flow 18, the electromagnetic valve 16 of a 2/2-way Direct Action Type closed type,
One fixed combustible gas detector, a power module 17.
Fixed combustible gas detector includes: a detector gauge outfit 11 and a flame proof probe 13,
Flame proof probe 13 and detector gauge outfit 11 are structurally separated, electrical connection, detector gauge outfit 11
To flame proof probe 13 power supply, pass through bus communication between the two.In flame proof probe 13, installation infrared passes
Sensor 132, infrared sensor 132 is measured scope from 0～100% fuel gas 19 of concentration, is measured
Precision exceeds catalytic combustion sensor an order of magnitude, and in air and fuel gas, output signal is steady
Qualitative, it is better than catalytic combustion sensor more than at least 10 times, it is preferable that use Britain Dynament
Infrared fuel gas Premier series of IR sensor.Flame proof probe 13 is arranged on accelerated ageing and surveys
In examination unit 2, and detector gauge outfit 11 is arranged on outside accelerated ageing test cell 2.
Detector gauge outfit 11 comprises an ARM single-chip microcomputer 111, a relay 112, consolidates in instrument
Can set two warning concentration in part, one of them reports to the police (referred to as Alarm Low, AL) for low concentration,
Reporting to the police (referred to as Alarm High, AH) for high concentration for one, fixed combustible gas detector detects
Reach warning concentration to gas concentration, relay 112 will action, or adhesive conducting or separate disconnected
Road；
The flame proof probe 13 of fixed combustible gas detector comprises a Britain Dynament's
The infrared sensor of Premier series, one piece of analog signal conditioner pcb board, pcb board comprises one
Mixed-signal processor MSP430 (Mixed Signal Processor), A/D therein conversion is logical
Road, by the voltage signal of the expression gas concentration that infrared sensor produces, is changed into and becomes with gas concentration
The digital signal of linear scale, and by bus, this digital signal is concentrated on detector gauge outfit 11
On ARM single-chip microcomputer 111.
Power module 17 inputs 220V 50Hz alternating current, exports 24V 1A unidirectional current, gives solid respectively
Fixed pattern combustible gas detector and electromagnetic valve 16 are powered.The adjustable suspended body flowmeter of flow 18, casing
During volume 24 liters, it is 50 persons of outstanding talent liter/min that float-type 18 counts flow controllable.
Gas concentration control unit 1 structural representation is as shown in Figure 2: circuit is by power module 17,
Relay 112 and electromagnetic valve 16 constitute a loop, when ARM single-chip microcomputer 111 controls relay 16
During adhesive, relay 16 turns on, and whole loop turns on, and power module 117 powers on to electromagnetic valve 16,
The air circuit breaker conducting that electromagnetic valve 16 controls.Gas circuit is fuel gas 19 in gas cylinder, by float stream
Gauge 18 current limliting, through electromagnetic valve 16, enters accelerated ageing test cell 2.
Accelerated ageing test cell 2 includes: an airtight lucite test box, two fans 24,
One Hygrothermograph, a digital display manometer 26, a pressure leakage port 23, an aviation plug
22, a gas concentration control unit air inlet 21, a life appraisal unit air inlet 28.
The lucite test box of accelerated ageing test cell 2, lucite wall thickness more than 15 millimeters,
Using rectangular structure, upper cover plate is detachable.Upper cover plate uses polytetrafluoroethylene sealing gasket sheet with casing
Sealing, screw hole is evenly distributed on lucite wall, the screw running through upper cover plate compress and seal.Case
Body volume is determined by number of sensors to be measured, the most simultaneously 8 sensors of test, box house size
400 × 300 × 200 millimeters.Accelerated ageing test box planar structure schematic diagram is as shown in Figure 3.
Two fans 24 in accelerated ageing test box 41, use intrinsic safety explosion-proof, are mounted opposite at case
Body sidewall, operative orientation is parallel, and stagger distance as far as possible, and with gas concentration control unit 1 and life-span
Assessment unit air inlet 28 is vertical, is quickly mixed with air by fuel gas.
Hygrothermograph in accelerated ageing test box 41, uses intrinsic safety explosion-proof, small size size, electricity
Pond powers, and measures temperature range-30 DEG C～100 DEG C, measures humidity range 0～100%RH.
Digital display manometer 26 in accelerated ageing test box 41, employing intrinsic safety explosion-proof, small size size,
Battery is powered, and measures pressure limit 0～0.05MPa.
Pressure leakage port in accelerated ageing test box 41, equipped with Spring-Loaded Pressure Relief Valve, vent pressure is excellent
Elect 0.1MPa as, it is possible to releasing pressure automatically ensures safety.
Aviation plug 22 in accelerated ageing test box 41, powers to parts all in case, gives and needs
There is provided with the parts of external data communication and electrically connect.Aviation plug 22 ensure electric connecting joint airtight every
Quick-fried, core number is determined by number of sensors to be measured, preferably by the 24 straight plugs of core, socket four eyed
Flange is installed.Two air inlets in accelerated ageing test box 41, lead directly to preferably by bite type
Crossing plate pipe joint, material is Stainless steel 316, and gas circuit uses 4 millimeters of stainless steel tubes of diameter or Teflon
Hard tube.
Sensor processing unit 3 circuit theory diagrams as shown in Figure 4, including one piece of sensing
Device analogue signal extracts circuit board, and a sensor analog signals processes circuit 31.Sensor Analog Relay System is believed
Number extraction circuit board, can install 8 catalytic combustion sensor simultaneously, and sensor analog signals extracts electricity
Road plate has three parts: (1) 8 rounded sensor analog signals that is evenly distributed on of sensor extracts
The surrounding of circuit board, it is sensor signal processing circuit that sensor analog signals extracts the central authorities of circuit board
31, the power supply chip in circuit provides fixing running voltage to each sensor 32；(2) two resistances
It is worth identical resistance and constitutes a brachium pontis of Wheatstone bridge, the catalysis (black) of sensor 32 and ginseng
Examine (in vain) element and constitute another brachium pontis.The black-and-white component of 8 sensors 32 is respectively a brachium pontis,
Share resistance brachium pontis, constitute 8 Wheatstone bridges.Sensor 32 black-and-white component brachium pontis, electric current is first
Through white element, then through black element, it is connected to ground；(3) in Wheatstone bridge, black-and-white component bridge
The mid-point voltage of arm is designated as VC, and the mid-point voltage of resistance brachium pontis is designated as VR, the output signal of sensor
Calculate by VC-VR；
Sensor signal processing circuit 31 includes two parts: the power supply of (1) power supply chip TPS76333
Part, externally fed is converted into working sensor voltage, divides to signal amplifying part simultaneously by this chip
Operational amplifier is powered；(2) modulate circuit part, operational amplifier TLV2461 differential amplification favour this
Energising bridge input signal, the analogue signal after amplification is transferred to life appraisal unit.
Life appraisal unit 4 includes: the calibrating gas of two bottles of band air relief valve, and one bottle is high pure air 42,
One bottle is the fuel gas 43 of 50%LEL concentration, and a manual T-shaped tee ball valve, a flow can
The suspended body flowmeter 18 adjusted, the desktop computer of a band I/O expansion slot, the number of a pci interface
According to capture card, a set of data acquisition/storage/display software.The most T-shaped in life appraisal unit 4
Tee ball valve, material is 316 rustless steels, it is possible to realized high pure air in 1 second and 50%LEL can
Switch between combustion gas body.The adjustable suspended body flowmeter of flow 18 in life appraisal unit 4, tank-volumes
When 24 liters, the flow controllable of suspended body flowmeter 18 is 5 liters/min.
Data collecting card in life appraisal unit 4, inserts in the I/O expansion slot of PC mainboard,
Access in pci bus mode, gather the voltage analog signal of sensor processing unit input.Excellent
Selection of land, data collecting card port number is single-ended 16 tunnels/difference 8 tunnel, sample frequency 1M, resolution
16, precision is the 0.05% of full scale, range 0～5V.Data acquisition in life appraisal unit 4
Collection/store/display software, it is preferable that can setting data acquisition condition, when start and end adopted
Sample/sample frequency/record time/number of active lanes etc., it is possible to realize voltage analog input in more than 12 hours
The data record of signal, the data export function multiple file format of support, such as: Microsoft Excel,
NI LabVIEW and MathWorks MATLAB etc..The schematic diagram of life appraisal unit is as shown in Figure 5.
Whole catalytic combustion sensor working life appraisal procedure, first secondary standard operating procedure is as follows:
1. being arranged in forced ventilation environment, such as fume hood by whole system device, ambient temperature and humidity is permanent
It is scheduled between 20～25 DEG C of@40～60%RH；
2. the catalytic combustion sensor treating life appraisal is arranged on sensor analog signals and extracts circuit
On plate；
3. power on to all unit of whole system；
4. the infrared sensor of gas concentration control unit is demarcated；
5. allow catalytic combustion sensor preheat 10 minutes, then cover accelerated ageing test box upper cover,
Do not add screw to compress；
6. opening the high pure air gas cylinder air relief valve of life appraisal unit 4, manual switching three-way valve is to high
Pure air 42, is passed through high pure air 42 to accelerated ageing test box 41, passes through float-type
Meter 18 regulation flow 5 liters/min, observes digital display manometer in accelerated ageing test box 41
26, it is ensured that casing internal gas pressure is in catalytic combustion sensor service pressure scope；
7. observe infrared sensor 132 measurement data of gas concentration control unit 1, it is ensured that in casing
Combustable gas concentration is zero；
8. open the data acquisition/storage/display software in life appraisal unit 4, treat that catalysis burning passes
After sensor stable output signal in atmosphere, start to record data；
9. open the 50%LEL fuel gas gas cylinder air relief valve of life appraisal unit 4, band software records
After 1 minute, manual switching three-way valve to 50%LEL fuel gas, by software continuous record/
Storage sensors output signal, until signal stabilization is recorded number of times infrared sensor concentration and is read
Number；
10. the software in end-of-life assessment unit 4；
11. manual switching three-way valve, to high pure air, are passed through high pure air to accelerated ageing test box 41
42, flow 5 liters/min, the infrared sensor observing gas concentration control unit 1 is measured
Data, it is ensured that in casing, fuel gas 43 concentration reverts to zero；
12. air relief valve cutting out 4 two gas cylinders of life appraisal unit, are then shut off life appraisal unit 4
Suspended body flowmeter；
Cover-use screw on accelerated ageing test box 41 is compressed by 13.；
The 14. 100% concentration combustible gas 43 gas cylinder air relief valve opening gas concentration control unit；
15. suspended body flowmeters 18 opening gas concentration control unit 1, treat that relay is connected, electromagnetism
During the conducting of valve events gas circuit, regulation charge flow rate 50 person of outstanding talent liter/min；
As need to measure catalytic combustion sensor current sensitivity spend time, operating procedure is as follows:
1. close 100% concentration combustible gas gas cylinder air relief valve of gas concentration control unit 1；
2. close the suspended body flowmeter 18 of gas concentration control unit 1；
3. unclamp the screw of life appraisal test box upper cover；
Run the 6th step in first secondary standard operating procedure to the 15th step；
Gas concentration control unit 1 controls the principle of combustable gas concentration in accelerated ageing test box 41
As follows:
Predictive sensor service life, design the accelerated ageing testing time, by the former divided by the latter, really
Determine accelerated ageing concentration factor α.According to actual industrial environment, the common concentration C of fuel gas 1 (detection
The warning mean concentration of instrument record), and α and accelerated ageing test concentrations corresponding relation (by
Experiment determines, after be described in detail), determine the combustable gas concentration of accelerated aging tests.
In accelerated ageing test box 41, fuel gas 43 concentration does not exceeds 70%LEL in principle, except protecting
Outside card test safety, also need to prevent in particular cases concentration overload from sensor is caused damage.Below with
Explanation as a example by accelerated ageing concentration 50%LEL.
Combustible gas detector, low concentration alarm point (referred to as Alarm Low, AL) is set as 49%LEL,
High concentration alarm point (referred to as Alarm High, AH) is set as 50%LEL.Detector relay
Working condition is: connect less than 49%LEL, disconnects higher than 50%LEL.
When in life appraisal test box, combustable gas concentration is less than 49%LEL, relay is connected, electricity
Magnet valve powers on, and gas circuit turns on, and 100% concentration combustible gas is passed through survey with the low discharge of 50 ml/min
Examination case, by the rapid mix homogeneously of fan 24.When in test box, combustable gas concentration reaches 50%LEL
Time, relay disconnects, circuit breaker, electromagnetic valve power-off, and gas circuit is ended.Now delayed due to gas circuit
Effect, in test box, combustable gas concentration still can slightly rise, by regulation effusion meter flow, can be by
Maximum concentration value controls in 51%LEL.During whole concentration controls, combustable gas concentration 49～
In the range of 51%LEL, with sine wave change in oscillation.
Must there be scope, otherwise a relay frequent movement between C1 and C2, cannot effectively control on the contrary
Concentration processed.According to the industry of GB GB15322.1 combustible gas probe part 1 and commercial use
In combustible gas probe, measuring the gas detector that scope is 3～100%LEL, range instruction is partially
Difference is at ± 5%LEL, and in this service life evaluation system, the fluctuation range of combustable gas concentration ± 1%LEL is permissible
Accept.
Claims (10)
1. a catalytic combustion sensor working life apparatus for evaluating, it is characterised in that: include gas
Concentration control unit, accelerated ageing test cell, sensor processing unit, life appraisal unit:
Described gas concentration control unit includes one bottle of fuel gas, and described fuel gas is by gas circuit even
Connecing suspended body flowmeter, described suspended body flowmeter connects electromagnetic valve by gas circuit, and described electromagnetic valve passes through gas
Road connects gastight joint, and described gas concentration control unit also includes a fixed fuel gas detection
Instrument and a power module, described fixed combustible gas detector includes a detector gauge outfit and
Individual flame proof is popped one's head in, and detector gauge outfit connects flame proof by circuit and pops one's head in, detector gauge outfit and flame proof probe
Between Aviation Connector is set, described power module is powered by the alternating current power supply of 220V, power module
Connecting detector gauge outfit and electromagnetic valve by circuit, described flame proof probe includes infrared sensor, one piece
Analog signal conditioner pcb board, pcb board comprises a mixed-signal processor, and detector gauge outfit comprises
One ARM single-chip microcomputer, a relay；
Described accelerated ageing test cell includes airtight lucite test box, fan, a humiture
Meter, digital display manometer, also include pressure leakage port, aviation plug, gas concentration control unit air inlet
Mouthful, also include life appraisal unit air inlet；
Described sensor processing unit includes that sensor analog signals extracts circuit board and sensor
Signal processing circuit, sensor analog signals extracts distribution sensor on circuit board, and two resistances are identical
Resistance constitute a brachium pontis of Wheatstone bridge, the catalysis (black) of sensor and first with reference to (in vain)
Part constitutes another brachium pontis, and the black-and-white component of sensor is respectively a brachium pontis, shares resistance brachium pontis, structure
Becoming Wheatstone bridge, sensor black-and-white component brachium pontis, electric current first passes through white element, then through black element,
Being connected to ground, sensor signal processing circuit includes two parts, is power supply chip TPS76333 respectively
Power pack and modulate circuit part；
Described life appraisal unit includes two bottles of calibrating gas, and one bottle is high pure air, and one bottle is flammable
Gas, manual T-shaped tee ball valve, including suspended body flowmeter, desktop computer, pci interface
Data collecting card, and data acquisition/storage/display software.
2. a kind of catalytic combustion sensor working life apparatus for evaluating as claimed in claim 1, its
Being characterised by: described gas concentration control unit is connected with accelerated ageing test cell, sensor is believed
Number processing unit is arranged in accelerated ageing test cell, sensor processing unit and life appraisal
Unit is connected, and life appraisal unit is in outside accelerated ageing test cell, and is attached thereto.
3. a kind of catalytic combustion sensor working life apparatus for evaluating as claimed in claim 2, its
It is characterised by: the circuit of described gas concentration control unit is by power module, relay and electromagnetic valve structure
Becoming a loop, when ARM Single-chip Controlling relay adhesive, relay turns on, and whole loop is led
Logical, power module powers on to electromagnetic valve, and the air circuit breaker conducting that electromagnetic valve controls, gas circuit is in gas cylinder
Fuel gas, by suspended body flowmeter current limliting, through electromagnetic valve, enters accelerated ageing test cell.
4. a kind of catalytic combustion sensor working life apparatus for evaluating as claimed in claim 3, its
It is characterised by: the fuel gas of gas concentration control unit is with air relief valve, and electromagnetic valve is 2/2-way
Direct Action Type closed type, float-type is calculated as flow adjustable type.
5. a kind of catalytic combustion sensor working life apparatus for evaluating as claimed in claim 4, its
It is characterised by: the lucite test box in accelerated ageing test cell, lucite wall thickness 15 milli
More than meter, using rectangular structure, upper cover plate is detachable, and upper cover plate uses politef with casing
Gasket seal seals, and screw hole is evenly distributed on lucite wall, the screw running through upper cover plate compress
Seal, the most simultaneously 8 sensors of test, box house size 400 × 300 × 200 millimeters.
6. a kind of catalytic combustion sensor working life apparatus for evaluating as claimed in claim 5, its
It is characterised by: accelerated ageing test box is provided with two fans, uses intrinsic safety explosion-proof, be mounted opposite
At wall box, operative orientation is parallel, and with the entering of gas concentration control unit and life appraisal unit
QI KOU is vertical；Hygrothermograph in accelerated ageing test box, uses intrinsic safety explosion-proof；Accelerated ageing is tested
Digital display manometer in case, uses intrinsic safety explosion-proof；Pressure leakage port in accelerated ageing test box, equipped with
Spring-Loaded Pressure Relief Valve, vent pressure is preferably 0.1MPa.
7. a kind of catalytic combustion sensor working life apparatus for evaluating as claimed in claim 6, its
It is characterised by: the aviation plug in accelerated ageing test box uses the 24 straight plugs of core, socket four eyed
Flange install, two air inlets in accelerated ageing test box, use bite type straight through plate pipe joint,
Material is Stainless steel 316, and gas circuit uses 4 millimeters of stainless steel tubes of diameter or Teflon hard tube.
8. a kind of catalytic combustion sensor working life apparatus for evaluating as claimed in claim 7, its
It is characterised by: the data collecting card in life appraisal unit, inserts the I/O expansion slot of PC mainboard
In, access in pci bus mode, gather the voltage analog signal of sensor processing unit input,
Data collecting card port number is single-ended 16 tunnels/difference 8 tunnel, sample frequency 1M, resolution 16,
Precision is the 0.05% of full scale, range 0～5V.
9. an appraisal procedure for applied catalysis combustion sensor working life apparatus for evaluating, its feature
Being: whole catalytic combustion sensor working life appraisal procedure, first secondary standard operating procedure is as follows:
1) whole system device is arranged in forced ventilation environment, such as fume hood, ambient temperature and humidity
Constant between 20～25 DEG C of@40～60%RH；
2) catalytic combustion sensor treating life appraisal is arranged on sensor analog signals and extracts circuit
On plate；
3) power on to all unit of whole system；
4) infrared sensor of gas concentration control unit is demarcated；
5) allow catalytic combustion sensor preheat 10 minutes, then cover accelerated ageing test box upper cover,
Do not add screw to compress；
6) opening the high pure air gas cylinder air relief valve of life appraisal unit, manual switching three-way valve is to high
Pure air, is passed through high pure air to accelerated ageing test box, regulates flow 5 liters by suspended body flowmeter
/ minute, observe digital display manometer in accelerated ageing test box, it is ensured that casing internal gas pressure is in catalysis burning
Normal operation of sensor pressure limit；
7) the infrared sensor measurement data of gas concentration control unit is observed, it is ensured that flammable in casing
Gas concentration is zero；
8) open the data acquisition/storage/display software in life appraisal unit, treat that catalysis burning passes
After sensor stable output signal in atmosphere, start to record data；
9) the 50%LEL fuel gas gas cylinder air relief valve of life appraisal unit, band software records 1 are opened
After minute, manual switching three-way valve to 50%LEL fuel gas, by software continuous record/storage sensing
Device output signal, until signal stabilization records number of times infrared sensor concentration readings；
10) software in end-of-life assessment unit；
11) manual switching three-way valve is to high pure air, is passed through high pure air to accelerated ageing test box,
Flow 5 liters/min, observes the infrared sensor measurement data of gas concentration control unit, it is ensured that case
Internal combustable gas concentration reverts to zero；
12) close the air relief valve of two gas cylinders of life appraisal unit, be then shut off life appraisal unit
Suspended body flowmeter；
13) cover-use screw on accelerated ageing test box is compressed；
14) 100% concentration combustible gas gas cylinder air relief valve of gas concentration control unit is opened；
15) open the suspended body flowmeter of gas concentration control unit, treat that relay is connected, electromagnetism valve actuation
When making gas circuit conducting, regulation charge flow rate 50 person of outstanding talent liter/min.
10. a kind of applied catalysis combustion sensor working life apparatus for evaluating as claimed in claim 9
Appraisal procedure, it is characterised in that:
As need to measure catalytic combustion sensor current sensitivity spend time, operating procedure is as follows:
1) 100% concentration combustible gas gas cylinder air relief valve of gas concentration control unit is closed；
2) suspended body flowmeter of gas concentration control unit is closed；
3) screw of life appraisal test box upper cover is unclamped；
4) opening the high pure air gas cylinder air relief valve of life appraisal unit, manual switching three-way valve is to high
Pure air, is passed through high pure air to accelerated ageing test box, regulates flow 5 liters by suspended body flowmeter
/ minute, observe digital display manometer in accelerated ageing test box, it is ensured that casing internal gas pressure is in catalysis burning
Normal operation of sensor pressure limit；
5) the infrared sensor measurement data of gas concentration control unit is observed, it is ensured that flammable in casing
Gas concentration is zero；
6) open the data acquisition/storage/display software in life appraisal unit, treat that catalysis burning passes
After sensor stable output signal in atmosphere, start to record data；
7) the 50%LEL fuel gas gas cylinder air relief valve of life appraisal unit, band software records 1 are opened
After minute, manual switching three-way valve to 50%LEL fuel gas, by software continuous record/storage sensing
Device output signal, until signal stabilization records number of times infrared sensor concentration readings；
8) software in end-of-life assessment unit；
9) manual switching three-way valve is to high pure air, is passed through high pure air to accelerated ageing test box,
Flow 5 liters/min, observes the infrared sensor measurement data of gas concentration control unit, it is ensured that case
Internal combustable gas concentration reverts to zero；
10) close the air relief valve of two gas cylinders of life appraisal unit, be then shut off life appraisal unit
Suspended body flowmeter；
11) cover-use screw on accelerated ageing test box is compressed；
12) 100% concentration combustible gas gas cylinder air relief valve of gas concentration control unit is opened；
13) open the suspended body flowmeter of gas concentration control unit, treat that relay is connected, electromagnetism valve actuation
When making gas circuit conducting, regulation charge flow rate 50 person of outstanding talent liter/min.
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| CN117761442A (en) * | 2024-02-19 | 2024-03-26 | 深圳市鼎泰佳创科技有限公司 | Electronic load aging a degree test method System and method for controlling a system test equipment |
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