CN101666769A - Intelligent gas sensor residual service life prediction device and method - Google Patents
Intelligent gas sensor residual service life prediction device and method Download PDFInfo
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- CN101666769A CN101666769A CN200910153438A CN200910153438A CN101666769A CN 101666769 A CN101666769 A CN 101666769A CN 200910153438 A CN200910153438 A CN 200910153438A CN 200910153438 A CN200910153438 A CN 200910153438A CN 101666769 A CN101666769 A CN 101666769A
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Abstract
The invention relates to the technical field of intelligent field apparatuses, in particular to an intelligent gas sensor residual service life prediction device and a method, which can be used for monitoring the residual service life, aging rule and quality analysis of the gas sensor in the field apparatuses so as to maintain and manage in due time to avoid faults generated when used. During instrument calibration for each time, standard calibration gas is led in, and the device can detect the gain resistance value under the condition of output scale span and compares the gain resistance value with the corresponding gain resistance value of a new probe so as to obtain the residual service life of the probe even the sensor. The invention has the advantages of convenient use, accuracy and high reliability, improves the monitoring quality of field apparatuses and has wide application market and high economic benefit.
Description
Technical field
The present invention relates to a kind of intelligent gas sensor residual service life prediction device and method, be applied to gas sensor and the replacing and the maintenance of industry spot, belong to intelligent field apparatus technical field.
Background technology
In modern industry is produced, along with the raising of the increase of robotization capital investment, energy demand rising, plant factor, be equipped with microprocessor instrumentation---intelligent field apparatus has obtained widespread use.But, how to guarantee these automatically the smart machine that changes of adaptation condition remain under the safe condition and move, that is exactly the content that the health intelligent forecasting techniques is probed into.For many years, many safety equipment manufacturer has all developed the instrument that can announcement apparatus operator equipment is about to break down, for example to the indication of catalytic sensor residual life.In recent years along with the development of digital communication protocol technology, the operator can more effectively use smart devices, obtains measurement data and other data in real time, can analyze on-the-spot trend, but also input equipment supervisory routine is to obtain the better information of best maintenance period aspect.
The core of predictive maintenance is an intelligent diagnostics, and at various field apparatus, the method and apparatus of its intelligent diagnostics is also far from each other.In the prior art, the gas sensor that is used to monitor the state of inflammable gas, steam etc. is used very wide, comprising intelligent gas sensor based on microprocessor, but so far, determining of the prediction of the residual life of gas sensor and replacement cycle also do not have suitable method and apparatus available.
Summary of the invention
In order to address the above problem, the invention discloses a kind of intelligent gas sensor residual service life prediction device and method.The technical scheme that adopts is as follows:
A kind of intelligent gas sensor residual service life prediction device comprises transducing signal extraction unit, signal Processing and amplifying unit, full scale adjustment unit, residual life determination unit; The transducing signal extraction unit is connected with amplifying unit with signal Processing, and signal Processing is connected with the full scale adjustment unit with amplifying unit, and the full scale adjustment unit is electrically connected or communicates to connect with the residual life determination unit.
Preferably, the transducing signal extraction unit comprises transducing signal input port and bridge measuring circuit; Bridge measuring circuit is the resistance bridge metering circuit that comprises two pairs of resistance, and wherein the resistance of a pair of resistance equates, another resistance to resistance is roughly the same, and wherein the resistance of a resistance can be done suitable adjustment.
Preferably, signal Processing and amplifying unit adopt the differential amplifier circuit based on accurate instrumentation amplifier, and two output terminals of transducing signal extraction unit are received at the two ends of its signal input respectively, and accurate instrumentation amplifier is INA129.
Preferably, the full scale adjustment unit adopts digital regulation resistance; The effective resistance of its formation is in parallel with the gain resistor in the amplifying unit with signal Processing, and digital regulation resistance is AD5162BRZ10.
Preferably, the residual life determination unit comprises microprocessor and register, and its adjusting situation according to the full scale adjustment unit is calculated, and draws the residual life of gas sensor.
Preferably, this prediction unit can be integrally formed with gas sensor, also can exist in mode independently.
The intelligent gas sensor residual service life prediction method that adopts above-mentioned prediction unit to carry out may further comprise the steps:
Whether the probe of distinguishing this gas sensor earlier is new probe, if, the step 1 below carrying out; Otherwise, the step 2 below carrying out;
Step 1: the verification gas that feeds standard to sensing probe; Adjust the full scale adjustment unit, change the output voltage of signal Processing and amplifying unit; Continue the full scale adjustment unit, reach full scale until the output voltage of signal Processing and amplifying unit; The adjustment situation of record full scale adjustment unit this moment;
Step 2: the verification gas that feeds standard to sensing probe; Adjust the full scale adjustment unit, change the output voltage of signal Processing and amplifying unit; Continue the full scale adjustment unit, reach full scale until the output voltage of signal Processing and amplifying unit; The adjustment situation of record full scale adjustment unit this moment; The adjustment situation of the full scale adjustment unit of this old probe of obtaining and the adjustment situation of the full scale adjustment unit of the new probe of record are in advance carried out computing relatively; According to computing result relatively, draw this old probe and new relativity of popping one's head in, the i.e. serviceable life of this old sensor residual.
Preferably, adjusting the full scale adjustment unit is the SPI interface setting value of adjusting the digital regulation resistance in the full scale adjustment unit; The adjustment situation of record full scale adjustment unit is the SPI interface setting value of preserving probe.
Preferably, the adjustment situation of the full scale adjustment unit of the new probe preserved in the adjustment situation of the full scale adjustment unit of this old probe of obtaining and the register is carried out computing relatively be meant, the SPI interface setting value of the old probe that obtains and the SPI interface setting value of the new probe of record are in advance carried out division arithmetic.
Advantage of the present invention is, before and abnormal conditions that may cause meeting accident not enough in serviceable life of gas sensor take place, just predict the serviceable life of this sensor of staff in real time and even send caution, it has overturned the daily servicing of traditional gas sensor, can save passive maintenance work of maintainer and maintenance cost greatly.
Description of drawings
The block scheme of Fig. 1 residual service life prediction device of the present invention;
Fig. 2 is the hardware synoptic diagram of residual service life prediction device of the present invention;
Fig. 3 is the hardware circuit principle figure of residual service life prediction device of the present invention;
Fig. 4 is the FB(flow block) of method that the present invention adopts;
Symbol description
1 transducing signal extraction unit
2 signal Processing and amplifying unit
3 full scale adjustment units
4 residual life determination units
Embodiment
As shown in Figure 1, be a kind of intelligent gas sensor residual service life prediction device.Comprising: transducing signal extraction unit 1, signal Processing and amplifying unit 2, full scale adjustment unit 3, residual life determination unit 4 etc.Transducing signal extraction unit 1 is connected with amplifying unit 2 with signal Processing, and signal Processing is connected with full scale adjustment unit 3 with amplifying unit 2, and full scale adjustment unit 3 is electrically connected or communicates to connect with residual life determination unit 4.
This prediction unit can also comprise residual life indicating member (not shown), directly be connected with residual life determination unit 4 or residual life determination unit 4 connects through being attached thereto behind the suitable treatment circuit again, being used for the residual life of this intelligent gas sensor is indicated or pointed out, for example can be display device, acousto-optic hint device, voice device etc.This class indicating device is very common in the prior art, does not repeat them here.
As shown in Figure 2, be the hardware synoptic diagram of residual service life prediction device of the present invention.Wherein, transducing signal extraction unit 1 adopts bridge measuring circuit, for example resistance bridge metering circuit; The differential amplifier circuit that signal Processing and amplifying unit 2 adopt based on accurate instrumentation amplifier; Full scale adjustment unit 3 adopts potentiometer, and the gain (that is enlargement factor) that is used for differential amplifier circuit is adjusted, so that the output of differential amplifier circuit can be adjusted to certain value; Residual life determination unit 4 (not shown)s comprise microprocessor and register, its function can realize by the method for microprocessor in conjunction with software setting, be used for carrying out corresponding calculating, and draw the residual life of this intelligent gas sensor according to the adjusting position of potentiometer.
As shown in Figure 3, be the hardware circuit diagram of residual service life prediction device of the present invention.Wherein, transducing signal extraction unit 1 includes transducing signal input port WHT, RED and BLK and the main resistance bridge metering circuit of being made up of resistance R 2, R6, R9, R10, wherein R2 and R6 resistance equate, for example be 3.57k, R9 and 10 resistances are roughly the same, and the R10 resistance can be done suitable adjustment; Accurate instrumentation amplifier in signal Processing and the amplifying unit 2 adopts the INA129 chip of Texas Instrument, and two output terminals of transducing signal extraction unit 1 are received at the two ends of its signal input respectively, and gain resistor adopts resistance R 5, for example is 15k; Full scale adjustment unit 3 adopts digital regulation resistance AD5162BRZ10, its connected mode is seen Fig. 3, effective resistance (between 3,9 pin) is in parallel with the gain resistor R5 of accurate instrumentation amplifier, thereby, realize adjusting to the gain of accurate instrumentation amplifier by the setting of software to digital regulation resistance AD5162BRZ10; Residual life determination unit 4 can realize that its implementation further specifies below in conjunction with specific embodiments by the method for microprocessor in conjunction with software setting.
A kind of intelligent gas sensor residual service life prediction device adopts framework, the hardware of Fig. 2 and the detailed circuit of Fig. 3 of Fig. 1 to constitute, and operates on certain gas sensor, carries out life prediction for this sensor, draws the residual life of this sensor.Its Forecasting Methodology is as shown in Figure 4:
If this gas sensor is new sensor, sensing probe is new probe, then
The 1st step: the verification gas that feeds standard to sensing probe.Because the sensor of this moment is brand-new qualified sensor, therefore transducing signal extraction unit 1 obtains specified input signal from transducing signal input port WHT, RED and BLK, two output terminals should be a ratings, for example be that 100mV is (if there is deviation, can adjust by adjustable resistance R10), this 100mV differential signal is input to the input end of the accurate instrumentation amplifier INA129 in signal Processing and the amplifying unit 2, produces an output voltage at the INA129 output terminal.
The 2nd step: adjust the SPI interface setting value of digital regulation resistance, change the output voltage of signal Processing and amplifying unit 2.If verifier wishes that the output voltage of signal Processing and amplifying unit 2 is the full scale of AD reference voltage, for example be 4.1V, because this moment, the difference of INA129 was input as 100mV, then the enlargement factor of INA129 should be adjusted into G=4.1 * 1000/100=41, and according to its circuit characteristic, G=1+49.4k/ (R//15k), wherein R is the equivalent resistance (3 of digital regulation resistance AD5162BRZ10, between 9 pin), therefore, the operator can be by regulating digital regulation resistance AD5162BRZ10, change the gain of INA129, thereby make the output voltage of INA129 reach required value.
The 3rd step: continue to adjust the SPI interface setting value of digital regulation resistance, until AD full scale output (representing that with the AD full scale residual life is 100%).
The 4th step: preserve SPI interface setting value that this moment should new probe at 100% o'clock to register (promptly note residual life be SPI interface setting value).
If this gas sensor is used old sensor, sensing probe is used old probe, then
The 1st step: the verification gas that feeds standard to old probe.Transducing signal extraction unit 1 obtains specified input signal from transducing signal input port WHT, RED and BLK, because the sensor of this moment is old sensor, the output valve of two output terminals then is not original ratings, for example be 80mV, this 80mV differential signal is input to the input end of the accurate instrumentation amplifier INA129 in signal Processing and the amplifying unit 2, produces an output voltage at the INA129 output terminal.
The 2nd step: adjust the SPI interface setting value of digital regulation resistance, change the output voltage of signal Processing and amplifying unit 2.If verifier wishes that the output voltage of signal Processing and amplifying unit 2 is the full scale of AD reference voltage, for example be 4.1V, because this moment, the difference input of INA129 for example was 80mV, then the enlargement factor of INA129 should be adjusted into G=4.1 * 1000/80=51.25, and according to its circuit characteristic, G=1+49.4k/ (R ' // 15k), wherein R ' is the digital regulation resistance AD5162BRZ10 equivalent resistance (3 of this moment, between 9 pin) (obviously, R and R ' resistance are also unequal), therefore, the operator can change the gain of INA129, thereby make the output voltage of INA129 reach required value by regulating digital regulation resistance AD5162BRZ10.
The 3rd step: continue to adjust the SPI interface setting value of digital regulation resistance, until the output of AD full scale (because R and R ' resistance and unequal, therefore the SPI interface setting value of the old probe of this moment and be not equal to the SPI interface setting value of the new probe of preserving in the register).
The 4th step: the SPI interface setting value of the new probe of preserving in the SPI interface setting value of the old probe that will obtain and the register is carried out division arithmetic.
The 5th step: according to the ratio value that the result of computing obtains, draw the relativity of this old probe and new probe, that is the serviceable life of this old sensor residual.
Following table has been enumerated the input/output relation of digital regulation resistance in the mode of example, and its essence upper body has showed the merchant of twice SPI interface setting value and the corresponding relation of life-span number percent.
| ??D(Dec) | ?R WR(Ω) | ??Output?State |
| ??255 ??128 ??1 ??0 | ?9,961 ?5,060 ?139 ?100 | ??Full?scale(R AB-1LSB+R W) ??Midscale ??1LSB ??Zero?scale(wiper?contact?resistance) |
It is to be noted, SPI is as a kind of four line locking serial communication interfaces, MCU can be transferred to digital regulation resistance with setting value by the SPI interface, the output resistance of CONTROLLED POTENTIAL device, SPI interface setting value mentioned herein, all be meant the setting value that obtains according to its SPI interface in digital regulation resistance, its effective resistance with digital regulation resistance this moment is corresponding, has reflected the effective resistance value of digital regulation resistance this moment in fact; The verification gas of this paper mentioned standard in two embodiment is meant the verification gas of equal number and character, and its quantity and character also can be decided as required.
Among the embodiment of front, the transducing signal extraction unit adopts the resistance bridge metering circuit, but the transducing signal extraction unit among the present invention is not limited thereto, and can also adopt other metering circuit to realize, as sensitive resistance, galvanic couple etc.
Among the embodiment of front, signal Processing and amplifying unit adopt the differential amplifier circuit based on accurate instrumentation amplifier, but signal Processing and amplifying unit among the present invention are not limited thereto, and can also adopt other amplifying circuit to realize, as other high-precision operational amplifier.
Among the embodiment of front, full scale adjustment unit 3 adopts digital regulation resistance, but the full scale adjustment unit 3 among the present invention is not limited thereto, also can adopt other resistance adjustment part to realize, as adjustable resistance, it is 100% that the resistance position of transferring by the timing signal of will newly popping one's head in is designated as residual life, different with embodiment is, the operator is carrying out timing signal to old probe, can pass through the physics number of turns of the resistance R adjusted and calculate adjusted gain resistor value, thereby calculate the residual life of this old sensor.
Among the embodiment of front, the model of the part components and parts of this prediction unit has been carried out the example explanation, but each components and parts among the present invention are not limited thereto, also can adopt the components and parts of other model to realize.
Describe the present invention with way of example above, but the invention is not restricted to above-mentioned specific embodiment, allly all belong to the scope of protection of present invention based on any change or modification that the present invention did.
Claims (10)
1. an intelligent gas sensor residual service life prediction device is characterized in that: comprise transducing signal extraction unit (1), signal Processing and amplifying unit (2), full scale adjustment unit (3), residual life determination unit (4); Described transducing signal extraction unit (1) is connected with amplifying unit (2) with signal Processing, signal Processing is connected with full scale adjustment unit (3) with amplifying unit (2), and full scale adjustment unit (3) is electrically connected or communicates to connect with residual life determination unit (4).
2. prediction unit according to claim 1 is characterized in that, described transducing signal extraction unit (1) comprises transducing signal input port and bridge measuring circuit; Described bridge measuring circuit is the resistance bridge metering circuit that comprises two pairs of resistance, and wherein the resistance of a pair of resistance equates, another resistance to resistance is roughly the same, and the resistance of one of them resistance can be done suitable adjustment.
3. prediction unit according to claim 1, it is characterized in that, described signal Processing and amplifying unit (2) adopt the differential amplifier circuit based on accurate instrumentation amplifier, and two output terminals of transducing signal extraction unit (1) are received at the two ends of its signal input respectively.
4. prediction unit according to claim 3 is characterized in that, described accurate instrumentation amplifier is INA129.
5. prediction unit according to claim 1 is characterized in that, described full scale adjustment unit (3) adopts digital regulation resistance; The effective resistance of its formation is in parallel with the gain resistor in the amplifying unit (2) with signal Processing.
6. prediction unit according to claim 5 is characterized in that; Described digital regulation resistance is AD5162BRZ10.
7. prediction unit according to claim 1 is characterized in that, described residual life determination unit (4) comprises microprocessor and register, and its adjusting situation according to full scale adjustment unit (3) is calculated, and draws the residual life of gas sensor.
8. employing such as the described prediction unit of the claim 1-7 intelligent gas sensor residual service life prediction method of carrying out is characterized in that, may further comprise the steps:
Whether the probe of distinguishing this gas sensor earlier is new probe, if, the step 1 below carrying out; Otherwise, the step 2 below carrying out;
Step 1:
1.1 feed the verification gas of standard to sensing probe;
1.2 adjust full scale adjustment unit (3), change the output voltage of signal Processing and amplifying unit (2);
1.3 continue to adjust full scale adjustment unit (3), reach full scale until the output voltage of signal Processing and amplifying unit (2);
1.4 the adjustment situation of record full scale adjustment unit this moment (3);
Step 2:
2.1 feed the verification gas of standard to sensing probe;
2.2 adjust full scale adjustment unit (3), change the output voltage of signal Processing and amplifying unit (2);
2.3 continue to adjust full scale adjustment unit (3), reach full scale until the output voltage of signal Processing and amplifying unit (2);
2.4 the adjustment situation of record full scale adjustment unit this moment (3);
2.5 the adjustment situation of the full scale adjustment unit (3) of this old probe that will obtain is carried out computing relatively with the adjustment situation of the full scale adjustment unit (3) of the new probe that writes down in advance;
2.6, draw this old probe and new relativity of popping one's head in, i.e. the serviceable life of this old sensor residual that this old probe is corresponding according to computing result relatively.
9. intelligent gas sensor residual service life prediction method according to claim 8 is characterized in that, described adjustment full scale adjustment unit (3) is a SPI interface setting value of adjusting the digital regulation resistance in the full scale adjustment unit (3); The adjustment situation of described record full scale adjustment unit (3) is the SPI interface setting value of preserving probe.
10. intelligent gas sensor residual service life prediction method according to claim 9, it is characterized in that, the adjustment situation of the full scale adjustment unit (3) of described this old probe that will obtain is carried out computing with the adjustment situation of full scale adjustment unit (3) of the new probe of record in advance and relatively is meant, the SPI interface setting value of the new probe preserved in the SPI interface setting value of the old probe that obtains and the register is carried out division arithmetic.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109238339A (en) * | 2018-09-30 | 2019-01-18 | 北京英视睿达科技有限公司 | The intelligence of the enviromental monitoring equipment of ginseng more than a kind of determines longevity method and device |
| CN110646569A (en) * | 2019-06-17 | 2020-01-03 | 上海是杰工业技术有限公司 | Method and device for predicting service life of gas sensor and computing equipment |
| CN113075263A (en) * | 2021-03-24 | 2021-07-06 | 南京信息工程大学 | Calibration device for CO gas sensor |
| CN113720989A (en) * | 2021-07-14 | 2021-11-30 | 浙江华消科技有限公司 | Detection system and detection method for service life of sensor |
-
2009
- 2009-10-12 CN CN200910153438A patent/CN101666769A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109238339A (en) * | 2018-09-30 | 2019-01-18 | 北京英视睿达科技有限公司 | The intelligence of the enviromental monitoring equipment of ginseng more than a kind of determines longevity method and device |
| CN109238339B (en) * | 2018-09-30 | 2023-10-13 | 国际商业机器（中国)投资有限公司 | Intelligent life-fixing method and device for multi-parameter environment monitoring equipment |
| CN110646569A (en) * | 2019-06-17 | 2020-01-03 | 上海是杰工业技术有限公司 | Method and device for predicting service life of gas sensor and computing equipment |
| CN113075263A (en) * | 2021-03-24 | 2021-07-06 | 南京信息工程大学 | Calibration device for CO gas sensor |
| CN113720989A (en) * | 2021-07-14 | 2021-11-30 | 浙江华消科技有限公司 | Detection system and detection method for service life of sensor |
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Application publication date: 20100310 |