CN106324178A - Working method of calibration-free catalytic combustion sensor - Google Patents
Working method of calibration-free catalytic combustion sensor Download PDFInfo
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- CN106324178A CN106324178A CN201510387763.0A CN201510387763A CN106324178A CN 106324178 A CN106324178 A CN 106324178A CN 201510387763 A CN201510387763 A CN 201510387763A CN 106324178 A CN106324178 A CN 106324178A
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Abstract
The invention discloses a working method of a calibration-free catalytic combustion sensor. A combustible gas detector employs a sensor A and a sensor B, zero points and sensitivity of the two sensors are identical, and zero points and sensitivity of the two sensors are recorded by factory calibration. The working method of the calibration-free catalytic combustion sensor realizes free of calibration of the catalytic combustion sensor, so that reliability of the catalytic combustion sensor is greatly improved, when the sensor is poisoned (baseline is rapidly changed and sensitivity is rapidly reduced), alarming is timely in order to prompt users to replace sensors.
Description
Technical field
Patent of the present invention relates to the detection device of gas sensor, more particularly, it relates to the catalysis combustion of a kind of non-calibrating
Burn working sensor method, its more reliable performance, be by the gas circuit of gas control instrument, the changing of peripheral circuit (i.e. software and hardware)
Enter, it is achieved the method for catalytic combustion sensor non-calibrating.
Background technology
The kind of sensor that industrial environment measures fuel gas is a lot, wherein catalytic combustion sensor due to linear convergent rate,
Quantitatively calibrating, precision are high, lower-price characteristic, are most widely used.
Catalytic combustion sensor output signal in clean air is referred to as zero point, defeated in certain combustable gas concentration
Go out referred to as span value, after span value deducts zero point, more i.e. obtain transducer sensitivity divided by corresponding combustable gas concentration.Catalysis burning
Sensor in use, can drift about (positively or negatively change), and sensitivity can decay, and (work long hours the sensitive number of degrees by zero point
Value can reduce, and is affected by temperature, humidity, pressure etc. in the short time, and sensitivity has positively or negatively change).For ensureing to measure
Accurately, after work a period of time, sensor needs to demarcate value.
The demarcation of catalytic combustion sensor refers to: record the zero point of sensor in pure air, then allows sensor
It is operated in the standard fuel gas environment of concentration known, records corresponding span value, preceding method calculate sensitivity.Due to
Combustable gas concentration is it is known that the accurate sensitivity that is under this concentration of sensitivity now.Due to its linear output character, whole
It is identical that individual measurement scope (0～100%LEL) is approximately considered sensitivity.
The specific works pattern of catalytic combustion sensor is: this sensitivity be stored in the EEPROM of peripheral circuit.Short
During time service, it is believed that zero point and sensitivity keep constant, when sensor is in unknown concentration fuel gas environment, by measuring
The span value backwards calculation obtained goes out combustable gas concentration.
Knowable to catalytic combustion sensor mode of operation, after work a period of time, for ensureing measured value accuracy, it is necessary to right
Sensor is demarcated.And demarcate and need working sensor at concentration known fuel gas environment, make calibration process pretty troublesome, and
And it is relatively costly.
The purpose of the present invention: controlled at cost, ensure on the premise of measurement accuracy, by improving gas control instrument
Gas circuit, peripheral circuit (i.e. software and hardware), it is achieved the non-calibrating of catalytic combustion sensor.
Summary of the invention
The catalytic combustion sensor method of work of a kind of non-calibrating disclosed by the invention,
The present invention, in order to realize non-calibrating in catalytic combustion sensor work process, is implemented by below scheme:
Use two sensors A and B, during sensor production, it is ensured that zero point and the sensitivity of the two sensor are near
Patibhaga-nimitta is same, by demarcating when two sensors dispatch from the factory, and equal accurate recording zero point and sensitivity.
The working sensor gas circuit that combustible gas detector uses: arrive first at one by the fuel gas after flame proof net
The electromagnetic valve of two-bit triplet, 1 mouthful and the 2 mouthfuls conducting when electromagnetic valve power-off, 1 mouthful and 3 mouthfuls, 2 mouthfuls and 3 mouthfuls block；When on electromagnetic valve
1 mouthful and 3 mouthfuls conducting during electricity, 1 mouthful and 2 mouthfuls, 2 mouthfuls and 3 mouthfuls block.Fuel gas is by the lower faint breath of 2 mouthfuls or 3 mouthfuls entrance of electromagnetic valve
Road, by measured when sensors A or B, then by a check valve, the effect of check valve is to ensure that the gas in the gas circuit of downstream
Body will not be back to gas circuit before valve.By the two-way gas circuit of check valve, a three-way valve merge into a road, by a sampling pump
Empty after sampling；
Original operating state: two-bit triplet electromagnetic valve power-off, powers on to sensors A in 2 mouthfuls of downstream gas circuits so that it is normal work
Make；Now sensor B power-off in 3 mouthfuls of downstream gas circuits of three-way magnetic valve, owing to three-way magnetic valve 3 mouthfuls blocks, gas circuit is being adopted thereafter
Sample pump is constantly bled down in low vacuum state, even if sampling pump power-off does not works, after the check valve guarantee valve in gas circuit, gas is not
Can flow backwards, then sensor B will not contact with environmental gas, it is believed that sensor B in a dormant state, the zero point of sensor B and spirit
The sensitivity short time will not change；
Sensor works with segmented model, within 7～10 days, is that a time period, sensors A and B alternate wheel change jobs.
In time rank, it was an operation interval with 24 hours.When sensors A is in working time section, it is
Measure sensor, be in power-up state (except during demarcation window, be described in detail after demarcating window definition) all the time, and sensor B is
Calibration sensor, only powers on when demarcating window and opening, demarcates sensors A；
In each operation interval (24 hours), setting two and demarcate window, one is referred to as Zero calibration window, a title
Window is demarcated for span value.Start to judge to demarcate window whether to meet the time point of unlocking condition and can fix, it is possible to according to reality
Work condition environment sets；
After the necessary success of Zero calibration, span value could be started and demarcate；
The condition meeting the unlatching of Zero calibration window is: the reading measuring sensor is less than 5%LEL, and during stable reading
Between more than 5～10 minutes.The condition meeting span value demarcation window unlatching is: the reading measuring sensor is more than 10%LEL, and
The stable reading time was more than 5～10 minutes；
Meet zero point, the condition of span value demarcation close is: calibration sensor completes a stably measured process, mark
The stable reading time determining sensor must be over 1～3 minute；The whole demarcation window the shortest opening time is 5 minutes, time the longest
Between be 15 minutes, if in 15 minutes, the stable reading time of calibration sensor is difficult to meet all the time, then close demarcate window
Mouthful, resume waiting for next window of demarcating and open；
At an operation interval, demarcate window and only open once, be not then turned on after having demarcated, wait next working area
Between select a good opportunity again unlatching.If in an operation interval, not met demarcates window unlocking condition, then demarcate window and be not turned on, etc.
Treat that next operation interval is selected a good opportunity unlatching again；
When satisfied demarcation window, powering on to two-bit triplet electromagnetic valve, fuel gas is switched to demarcate gas by measuring gas circuit
Road, by the measured value of calibration sensor, revises zero point and the sensitivity measuring sensor.
The catalytic combustion sensor method of work of a kind of non-calibrating disclosed by the invention, has the advantages that
1, the non-calibrating of catalytic combustion sensor is realized；
2, the reliability of catalytic combustion sensor is greatly improved, when occurring that (baseline drastically changes Sensor Poisoning, sensitivity
Drastically reduce) time, it is possible to and alarm, remind user's more emat sensor；
3, except increasing an electromagnetic valve, two check valves, outside gas circuit structure slightly complexity, more extra cost is not increased.With
Time use two sensors, but owing to being alternation, the detection life-span also extends one times, does not increase sensor cost；
Extend sensor service life.Catalytic combustion sensor works in Wheatstone bridge mode, sensor black-and-white component
Constituting a brachium pontis, another brachium pontis provides reference voltage by two fixed value resistances, when sensor zero drift is to certain journey
Degree, time excessive with reference voltage deviation, peripheral circuit cannot be revised, and sensor can only be changed.But the now sensitivity of sensor
Meet toward contact and use requirement.Use dual sensor mutually revise zero point, owing to sensor initial zero is identical, working environment and
Cumulative operation time is identical, and null offset is the most similar, and the scope of zero point correction will be greatly increased, and effectively extends sensor and uses the longevity
Life.
Accompanying drawing explanation
The work schematic diagram of gas circuit of the catalytic combustion sensor of the non-calibrating that Fig. 1 provides for the present invention.
Fig. 2 is span value correcting process figure.
Fig. 3 is zero correction flow chart.
In figure:
1 flame proof net 2 two-bit triplet electromagnetic valve 3 sensors A
4 sensor B 5 check valve 6 sampling pumps
Detailed description of the invention
The invention will be further described with embodiment below in conjunction with the accompanying drawings.
The present invention, in order to realize non-calibrating in catalytic combustion sensor work process, is implemented by below scheme:
Combustible gas detector uses two sensors A 3 and sensor B 4, during sensor production, it is ensured that these are two years old
The zero point of individual sensor is approximately the same with sensitivity or identical, by demarcating when two sensors dispatch from the factory, and equal accurate recording zero point
And sensitivity.
Combustible gas detector uses working sensor gas circuit as shown in Figure 1, first by the fuel gas after flame proof net 1
First one two-bit triplet electromagnetic valve 2 of arrival, 1 mouthful and the 2 mouthfuls conducting when two-bit triplet electromagnetic valve 2 power-off, 1 mouthful and 3 mouthfuls, 2 mouthfuls and 3
Mouth blocks；1 mouthful and the 3 mouthfuls conducting when two-bit triplet electromagnetic valve 2 powers on, 1 mouthful and 2 mouthfuls, 2 mouthfuls and 3 mouthfuls block.Fuel gas passes through
2 mouthfuls of two-bit triplet electromagnetic valve 2 or 3 mouthfuls enter downstream gas circuit, by measured when sensors A 3 or sensor B 4, then lead to
Crossing a check valve 5, the effect of check valve 5 is to ensure that the gas in the gas circuit of downstream will not be back to gas circuit before valve.By unidirectional
The two-way gas circuit of valve 5, is merged into a road by a three-way valve, a sampling pump 6 empty after sampling；
Original operating state: two-bit triplet electromagnetic valve 2 power-off, powers on to sensors A 3 in 2 mouthfuls of downstream gas circuits so that it is normal
Work；Now sensor B4 power-off in 3 mouthfuls of downstream gas circuits, owing to 3 mouthfuls are blocked, thereafter gas circuit under sampling pump 6 is constantly bled in
Low vacuum state, even if sampling pump 6 power-off does not works, after the check valve 5 in gas circuit ensures valve, gas will not flow backwards, then sensor
B4 will not contact with environmental gas, it is believed that in a dormant state, the zero point of sensor B4 and sensitivity short time are or not sensor B4
Can change；
Sensor works with segmented model, within 7～10 days, is that a time period, sensors A 3 and sensor B4 replace rotation work
Make.
In time rank, it was an operation interval with 24 hours.When sensors A 3 is in working time section, its
It is to measure sensor, is in power-up state (except when demarcating window, demarcate after window definition and be described in detail) all the time, and sensor B
4 is calibration sensor, only powers on when demarcating window and opening, demarcates sensors A 3；
In each operation interval (24 hours), setting two and demarcate window, one is referred to as Zero calibration window, a title
Window is demarcated for span value.Start to judge to demarcate window whether to meet the time point of unlocking condition and can fix, it is possible to according to reality
Work condition environment sets；
After the necessary success of Zero calibration, span value could be started and demarcate；
The condition meeting the unlatching of Zero calibration window is: the reading measuring sensor is less than 5%LEL, and during stable reading
Between more than 5～10 minutes.The condition meeting span value demarcation window unlatching is: the reading measuring sensor is more than 10%LEL, and
The stable reading time was more than 5～10 minutes；
Meet zero point, the condition of span value demarcation close is: calibration sensor completes a stably measured process, mark
The stable reading time determining sensor must be over 1～3 minute；The whole demarcation window the shortest opening time is 5 minutes, time the longest
Between be 15 minutes, if in 15 minutes, the stable reading time of calibration sensor is difficult to meet all the time, then close demarcate window
Mouthful, resume waiting for next window of demarcating and open；
At an operation interval, demarcate window and only open once, be not then turned on after having demarcated, wait next working area
Between select a good opportunity again unlatching.If in an operation interval, not met demarcates window unlocking condition, then demarcate window and be not turned on, etc.
Treat that next operation interval is selected a good opportunity unlatching again；
When satisfied demarcation window, powering on to two-bit triplet electromagnetic valve, fuel gas is switched to demarcate gas by measuring gas circuit
Road, by the measured value of calibration sensor, revises zero point and the sensitivity measuring sensor.Concrete modification method is shown in Fig. 2 and 3 flow processs
Figure.
Claims (4)
1. the catalytic combustion sensor method of work of a non-calibrating, it is characterised in that:
1) combustible gas detector uses sensors A and sensor B, and the zero point of two sensors is identical with sensitivity, two biographies
By demarcating record zero point and sensitivity when sensor dispatches from the factory；
2) combustible gas detector employing working sensor gas circuit is: arrive first at two three by the fuel gas after flame proof net
Three-way electromagnetic valve, 1 mouthful and the 2 mouthfuls conducting when two-bit triplet electromagnetic valve power-off, 1 mouthful and 3 mouthfuls, 2 mouthfuls and 3 mouthfuls block；Work as two-bit triplet
1 mouthful and 3 mouthfuls conducting when electromagnetic valve powers on, 1 mouthful and 2 mouthfuls, 2 mouthfuls and 3 mouthfuls block；Fuel gas passes through the 2 of two-bit triplet electromagnetic valve
Mouth or 3 mouthfuls of entrance downstream gas circuits, by measured when sensors A or sensor B, then by check valve, by check valve
Two-way gas circuit, is merged into a road by three-way valve, sampling pump empty after sampling；
3) in time rank, it was an operation interval with 24 hours, in each operation interval, sets two and demarcate window
Mouthful, one is Zero calibration window, demarcates window for span value for one, starts to judge to demarcate whether window meets unlocking condition
Time point is fixed or according to actual condition environment set；Start span value after Zero calibration success to demarcate；
4) when sensors A is in working time section, it is to measure sensor, is in power-up state all the time, and sensor B is to demarcate
Sensor, only powers on when demarcating window and opening, demarcates sensors A；
5) when satisfied demarcation window, powering on to two-bit triplet electromagnetic valve, fuel gas is switched to demarcate gas circuit by measuring gas circuit,
Zero point and the sensitivity of sensor is measured by the measured value correction of calibration sensor；
6) original operating state: two-bit triplet electromagnetic valve power-off, powers on to sensors A in 2 mouthfuls of downstream gas circuits and makes it normally work；
Now sensor B power-off in 3 mouthfuls of downstream gas circuits of two-bit triplet electromagnetic valve, thereafter gas circuit under sampling pump is constantly bled in low very
Dummy status, sensor B is in a dormant state.
The catalytic combustion sensor method of work of a kind of non-calibrating the most as claimed in claim 1, it is characterised in that:
At an operation interval, demarcate window and only open once, be not then turned on after having demarcated, wait next operation interval again
Selecting a good opportunity unlatching, if in an operation interval, not met demarcates window unlocking condition, then demarcate window and be not turned on, under wait
Individual operation interval is selected a good opportunity unlatching again.
The catalytic combustion sensor method of work of a kind of non-calibrating the most as claimed in claim 2, it is characterised in that:
The condition meeting the unlatching of Zero calibration window is: the reading measuring sensor is less than 5%LEL, and the stable reading time surpasses
Spend 5～10 minutes；The condition meeting span value demarcation window unlatching is: the reading measuring sensor is more than 10%LEL, and reading
Stabilization time was more than 5～10 minutes；
Meet zero point, the condition of span value demarcation close is: calibration sensor completes a stably measured process, demarcates and passes
The stable reading time of sensor must be over 1～3 minute；The whole demarcation window the shortest opening time is 5 minutes, and maximum duration is
15 minutes, if in 15 minutes, the stable reading time of calibration sensor was difficult to meet all the time, then close and demarcate window, weight
The new wait next one is demarcated window and is opened.
The catalytic combustion sensor method of work of a kind of non-calibrating the most as claimed in claim 3, it is characterised in that: sensor with
Segmented model works, and within 7～10 days, is that a time period, sensors A and B alternate wheel change jobs.
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| CN107677330A (en) * | 2017-06-22 | 2018-02-09 | 广东万和新电气股份有限公司 | A kind of current quantity measuring method, controller and water flow sensor |
| CN110763808A (en) * | 2019-11-13 | 2020-02-07 | 山东多瑞电子科技有限公司 | Factory calibration-free method for gas detector |
| CN111156413A (en) * | 2019-12-30 | 2020-05-15 | 清华大学 | Hydrogen pipeline system |
| CN112557599A (en) * | 2020-12-07 | 2021-03-26 | 河南省日立信股份有限公司 | Sensor field correction method |
| CN113588732A (en) * | 2021-07-28 | 2021-11-02 | 合肥微纳传感技术有限公司 | Gas sensor working device and working method thereof |
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Application publication date: 20170111 |