CN202041463U - Methane sensor device based on NDIR (non-dispersive infrared-red) principle - Google Patents
Methane sensor device based on NDIR (non-dispersive infrared-red) principle Download PDFInfo
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- CN202041463U CN202041463U CN 201120148347 CN201120148347U CN202041463U CN 202041463 U CN202041463 U CN 202041463U CN 201120148347 CN201120148347 CN 201120148347 CN 201120148347 U CN201120148347 U CN 201120148347U CN 202041463 U CN202041463 U CN 202041463U
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Abstract
The utility model relates to a methane sensor device based on the NDIR (non-dispersive infrared-red) principle, which comprises a casing. An NDIR detecting probe is arranged at the front end of the casing, an LED display unit is arranged on the casing, and a data processing unit connected with the NDIR detecting probe and the LED display unit respectively is arranged in the casing. The methane sensor device is capable of displaying actual probe detection data more effectively and working under the anaerobic environment, wide in measuring range, free of impact damage caused by high-concentration gas, long in service life, nontoxic, fast and accurate in measuring, high in selectivity for gas types, stable in measuring, long in calibration cycle and low in maintaining load, and is slightly interfered by other gases. Besides, by adopting the NDIR detecting probe, the methane sensor device has functions of online automatic zero calibration and automatic fault detection, is free of maintenance and provides a high-efficiency stable detecting method for enterprises.
Description
Technical field
The utility model relates to a kind of sensor device, especially a kind of methane transducer device based on non-dispersion infrared (NDIR) principle.
Background technology
Toxic and harmful explosion accidents such as methane are one of main threats of colliery, petrochemical industry safety in production, and the toxic and harmful blast is the great difficult problem of puzzlement mining, petrochemical industry always, and the accident that creates greater casualties occurs repeatedly, and causes tremendous loss.The environment that sensor uses can cause very big influence to sensor.Especially some material may cause sensor and poison or the reduction performance.Some material may decomposition catalyst and is formed solid matter at catalyst surface, and this may cause transducer sensitivity to reduce.The high concentration silicon-containing compound can make sensor damage immediately.Thereby other some materials can be absorbed or form new compound by catalyzer suppresses catalytic reaction, and this inhibition may be temporary, will recover automatically as long as sensor is placed in the fresh air a period of time, comes to this such as the influence of halogenated hydrocarbons.In any case but recovering all can not be completely, all can cause very big influence to the sensitivity of sensor.Other materials such as sulfuretted hydrogen, may have above-mentioned two kinds of influences.High concentration can make sensor lose efficacy immediately, and low concentration then has slight influence to sensitivity.Obviously existing detection means can't satisfy the use under the particular surroundingss such as colliery, petrochemical industry.
Summary of the invention
The purpose of this utility model is for overcoming above-mentioned the deficiencies in the prior art, the methane transducer device based on the NDIR principle that provides a kind of online methane simple in structure, easy to use, that oxides such as siliceous sulphur such as environmental impact is little, be applicable to the colliery, petrochemical industry detect methane gas to detect.
For achieving the above object, the utility model adopts following technical proposals:
A kind of methane transducer device based on the NDIR principle comprises housing, and the housing front end is provided with NDIR principle detection probe, and housing is provided with led display unit, is provided with respectively the data processing unit that links to each other with led display unit with NDIR principle detection probe in the housing.
Described data processing unit comprises cpu circuit, be connected with infrared signal receiving circuit, data storage circuitry, sound light alarming circuit, LED display circuit, frequency signal output circuit, power circuit, 485 signal output apparatus, 1-5mA circuit signal output circuit and serial communication circuit by distinct interface respectively on the described cpu circuit, described serial communication circuit also links to each other with NDIR principle detection probe; Described power circuit also links to each other with NDIR principle detection probe, LED display circuit, frequency signal output circuit, 485 signal output apparatus, 1-5mA circuit signal output circuit respectively.
Each circuit described in the utility model is prior art, does not repeat them here.
After the utility model front end NDIR principle detection probe detects surrounding environment system for tax payment alkane concentration, by serial communication circuit concentration signal is passed to cpu circuit, cpu circuit calculates by the communications protocol formula of formulating digital signal with densimeter after, by comparing with the high-concentration and low-concentration warning limit value that is stored in the data storage circuitry the inside, if surpass higher limit, to carry out onsite alarming by sound light alarming circuit, if the higher limit of being no more than is passed through 1-5mA circuit signal output circuit with concentration signal, 485 signal output apparatus, a kind of in the frequency signal output circuit is transferred to upper substation.
The utility model adopts the NDIR detection probe to have on-line automatic suppressed zero function, and the automatic fault measuring ability can be realized non-maintainingly, and the detection means of efficient stable is provided for enterprise.
Compared with prior art, the beneficial effects of the utility model embody in the following areas:
1) front end sensors detection head signal is output as digital signal, can eliminate the shortcoming of aspects such as mimic channel signal drift, components and parts circuit somewhat complex design with back segment CPU digital communication mode, shows that more effectively actual probe detects data.
2) can in oxygen-free environment, work.Oxygen concentration is a problem that must be noted that when measuring flammable explosive gas.Catalytic sensor requires at least the oxygen of 8-10% just can accurately measure.And under 100% combustible gas concentration, the reading of this instrument will be 0%VOL.Therefore in measuring rules, require before the %VOL that measures flammable explosive gas, must at first measure oxygen concentration.This also is the reason that requires must measure simultaneously oxygen and LEL why in confined space is measured.Be easy to obtain wrong result if under the situation of complete anaerobic, measure the LEL value.And the infrared type sensor need not the oxygen participation owing to measuring, and measurement result and oxygen content are irrelevant.
3) there is not the phenomenon that damaged by the high concentration gas gas percussion in measurement range big (range can be expanded arbitrarily).For catalytic sensor, the degree of accuracy of inflammable and explosive sensor also can be subjected to the influence of high concentration flammable gaseous mixture, and for the evaporation of the excessive heat meeting accelerator activator of measuring bridge, this can make the sensitivity of sensor partly or entirely reduce.Overheatedly also can burn measuring bridge.And, be exposed among the flammable explosive gas of the higher concentration of oxygen when not enough, then can cause the deposition of carbon black, and gathering of carbon black can cause the sensor explosion and damage circuit at sintered surface.And the infrared type sensor is based on the absorption of gas to light, need not heating during measurement, also can not produce heat, can measure the flammable explosive gas concentration of 0-100%VOL, the height of concentration for measuring sensor and process without any influence.
4) there are not poisoning problem, long service life.For catalytic sensor, the environment that sensor uses can cause very big influence to sensor.Especially some material may cause sensor and poison or the reduction performance.Some material may decomposition catalyst and is formed solid matter at catalyst surface, and this may cause transducer sensitivity to reduce.The high concentration silicon-containing compound can make sensor damage immediately.Thereby other some materials can be absorbed or form new compound by catalyzer suppresses catalytic reaction, and this inhibition may be temporary, will recover automatically as long as sensor is placed in the fresh air a period of time, comes to this such as the influence of halogenated hydrocarbons.In any case but recovering all can not be completely, all can cause very big influence to the sensitivity of sensor.Other materials such as sulfuretted hydrogen, may have above-mentioned two kinds of influences.High concentration can make sensor lose efficacy immediately, and low concentration then has slight influence to sensitivity.And, do not have the chemical reaction element to exist for the infrared type sensor, there are not the poisoning problem of element thereby long service life.
5) measure quick and precisely, gaseous species is had very high selectivity, be subjected to the interference of other gas little, the infrared type sensor, measurement is a kind of physical process, measuring speed is fast.Because the characteristic spectral line that has of gas with various is different, the emission spectrum of light source only just produces absorption in overlapping with gas absorption spectrum, thereby has the selectivity characteristic of height.
6) surveying work is stable, and calibration cycle is long, and maintenance workload is little.
As mentioned above, for catalytic sensor, be vulnerable to the erosion of high concentration gas and sulfide, after using a period of time, produce drift zero point, sensitivity descends, and therefore (about a week) will carry out the correction of zero point and sensitivity with calibrating gas at set intervals.Because the infrared type sensor does not exist poisoning problem and high concentration gas shock problem, it is highly stable to work, and the calibration cycle of zero point and sensitivity is long, and general needs several months or half a year once to proofread and correct.
Description of drawings
Fig. 1 is the utility model circuit theory diagrams.
Embodiment
Below in conjunction with drawings and Examples the utility model is further specified.
As shown in Figure 1, a kind of methane transducer device based on the NDIR principle comprises housing, and the housing front end is provided with NDIR principle detection probe, housing is provided with led display unit, is provided with respectively the data processing unit that links to each other with led display unit with NDIR principle detection probe in the housing.
Described data processing unit comprises cpu circuit, be connected with infrared signal receiving circuit, data storage circuitry, sound light alarming circuit, LED display circuit, frequency signal output circuit, power circuit, 485 signal output apparatus, 1-5mA circuit signal output circuit and serial communication circuit by distinct interface respectively on the described cpu circuit, described serial communication circuit also links to each other with NDIR principle detection probe; Described power circuit also links to each other with NDIR principle detection probe, LED display circuit, frequency signal output circuit, 485 signal output apparatus, 1-5mA circuit signal output circuit respectively.
After the utility model front end NDIR principle detection probe detects surrounding environment system for tax payment alkane concentration, by serial communication circuit concentration signal is passed to cpu circuit, cpu circuit calculates by the communications protocol formula of formulating digital signal with densimeter after, by comparing with the high-concentration and low-concentration warning limit value that is stored in the data storage circuitry the inside, if surpass higher limit, to carry out onsite alarming by sound light alarming circuit, if the higher limit of being no more than is passed through 1-5mA circuit signal output circuit with concentration signal, 485 signal output apparatus, a kind of in the frequency signal output circuit is transferred to upper substation.
Claims (2)
1. methane transducer device based on the NDIR principle, it is characterized in that: comprise housing, the housing front end is provided with NDIR principle detection probe, and housing is provided with led display unit, is provided with respectively the data processing unit that links to each other with led display unit with NDIR principle detection probe in the housing.
2. the methane transducer device based on the NDIR principle according to claim 1, it is characterized in that: described data processing unit comprises cpu circuit, be connected with infrared signal receiving circuit, data storage circuitry, sound light alarming circuit, LED display circuit, frequency signal output circuit, power circuit, 485 signal output apparatus, 1-5mA circuit signal output circuit and serial communication circuit by distinct interface respectively on the described cpu circuit, described serial communication circuit also links to each other with NDIR principle detection probe; Described power circuit also links to each other with NDIR principle detection probe, LED display circuit, frequency signal output circuit, 485 signal output apparatus, 1-5mA circuit signal output circuit respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120148347 CN202041463U (en) | 2011-05-11 | 2011-05-11 | Methane sensor device based on NDIR (non-dispersive infrared-red) principle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120148347 CN202041463U (en) | 2011-05-11 | 2011-05-11 | Methane sensor device based on NDIR (non-dispersive infrared-red) principle |
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| Publication Number | Publication Date |
|---|---|
| CN202041463U true CN202041463U (en) | 2011-11-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201120148347 Expired - Fee Related CN202041463U (en) | 2011-05-11 | 2011-05-11 | Methane sensor device based on NDIR (non-dispersive infrared-red) principle |
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| CN (1) | CN202041463U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103529095A (en) * | 2013-10-28 | 2014-01-22 | 新疆智翔科技有限公司 | Poisonous and harmful gas monitoring system |
| CN104730126A (en) * | 2015-03-20 | 2015-06-24 | 江苏三恒科技股份有限公司 | Methane sensor vibration identification recovery system |
-
2011
- 2011-05-11 CN CN 201120148347 patent/CN202041463U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103529095A (en) * | 2013-10-28 | 2014-01-22 | 新疆智翔科技有限公司 | Poisonous and harmful gas monitoring system |
| CN104730126A (en) * | 2015-03-20 | 2015-06-24 | 江苏三恒科技股份有限公司 | Methane sensor vibration identification recovery system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111116 Termination date: 20150511 |
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| EXPY | Termination of patent right or utility model |