CN115436329A - Gas measuring device - Google Patents
Gas measuring device Download PDFInfo
- Publication number
- CN115436329A CN115436329A CN202210558802.9A CN202210558802A CN115436329A CN 115436329 A CN115436329 A CN 115436329A CN 202210558802 A CN202210558802 A CN 202210558802A CN 115436329 A CN115436329 A CN 115436329A
- Authority
- CN
- China
- Prior art keywords
- gas
- detector
- signal
- processing unit
- detection
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000001514 detection method Methods 0.000 claims abstract description 66
- 238000012545 processing Methods 0.000 claims abstract description 49
- 238000005259 measurement Methods 0.000 claims abstract description 27
- 238000007781 pre-processing Methods 0.000 claims abstract description 21
- 238000012937 correction Methods 0.000 claims abstract description 18
- 238000006243 chemical reaction Methods 0.000 claims description 8
- 238000000034 method Methods 0.000 claims 3
- 238000011161 development Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 6
- 101100422768 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) SUL2 gene Proteins 0.000 description 4
- 239000000758 substrate Substances 0.000 description 4
- 230000001678 irradiating effect Effects 0.000 description 2
- HGUFODBRKLSHSI-UHFFFAOYSA-N 2,3,7,8-tetrachloro-dibenzo-p-dioxin Chemical compound O1C2=CC(Cl)=C(Cl)C=C2OC2=C1C=C(Cl)C(Cl)=C2 HGUFODBRKLSHSI-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/59—Transmissivity
- G01N21/61—Non-dispersive gas analysers
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N2021/0106—General arrangement of respective parts
- G01N2021/0112—Apparatus in one mechanical, optical or electronic block
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention provides a gas measuring device. The gas measurement device is provided with: a sample gas chamber; a light source; a detection unit that detects the intensity of light transmitted through the sample gas chamber; and a CPU that repeatedly analyzes the gas component in the sample gas. The detection section includes: a first detector that detects a gas component to be analyzed; and a plurality of second detectors that detect a plurality of components for interference correction used for interference correction of a gas component to be analyzed. The interface circuit includes: a preprocessing circuit that preprocesses a detection signal of the first detector so as to be input to the CPU and transmits the signal to the CPU; and a second signal processing unit that preprocesses a detection signal of the second detector so as to be input to the CPU, and sequentially transmits the detection signal to the CPU in a time-sharing manner. This can suppress development cost and improve accuracy.
Description
Technical Field
The present disclosure relates to a gas measuring device.
Background
Japanese patent application laid-open No. 9-49797 discloses an infrared gas analyzer that measures the concentration of a gas component by switching between a sample gas and a reference gas. In the infrared gas analyzer, the sample gas and the reference gas are alternately supplied into the gas chamber at a predetermined cycle by switching the three-way valve. In parallel with this, by intermittently irradiating infrared light from the light source into the gas chamber by rotating the sector by the motor, the detector can alternately detect the infrared light transmitted through the sample gas or the reference gas, and can analyze the gas component based on the output ratio of the detection output of the reference gas to the detection output of the sample gas.
Disclosure of Invention
The infrared gas analyzer disclosed in the above-mentioned Japanese patent application laid-open No. 9-49797 detects SO in a sample gas 2 Except by SO 2 Is also defined by CO, CO 2 、NO x Etc. are defined such that there is a difference in SO 2 Also for CO, CO 2 、NO x Etc. to monitor the concentration requirements. Therefore, a multi-component measuring instrument capable of measuring a plurality of gas components has also been developed.
For measuring various gas components, e.g. SO 2 、CO、CO 2 NO, 4 detectors and a CPU (Central Processing Unit) having at least 4 ports for receiving output signals from the detectors.
In recent years, in order to further improve detection accuracy, it has been required to detect a component interfering with a gas to be detected and to correct a detection result in addition to the gas component to be detected. However, in order to improve the conventional devices for use, the input port of the CPU is often insufficient. However, a huge development cost is required to design and manufacture a new device by changing the CPU.
The purpose of the present disclosure is to provide a gas measurement device that can reduce development costs and improve accuracy.
The disclosed gas measurement device is provided with: a sample gas chamber filled with a sample gas; a light source that irradiates light to the sample cell; a detection unit that detects the intensity of light emitted from the light source to the sample gas cell after the light has transmitted through the sample gas cell; a central processing unit that repeatedly analyzes the gas component in the sample gas based on the detection result of the detection unit; and an interface circuit that transmits the detection signal detected by the detection unit to the central processing unit. The detection section includes: a first detector that detects a gas component to be analyzed in the sample gas; and a plurality of second detectors that detect a plurality of components for interference correction used for interference correction of a gas component to be analyzed. The interface circuit includes: a first signal processing unit that preprocesses a detection signal of the first detector so that the detection signal can be input to the central processing unit, and transmits the signal to the central processing unit; and a second signal processing unit that preprocesses detection signals of the plurality of second detectors so that the detection signals can be input to the central processing unit, and sequentially transmits the detection signals to the central processing unit in a time-division manner.
The gas measurement device of the present disclosure can be developed with a reduced number of development steps, without changing the central processing unit, since it is only necessary to change a part of the signal processing unit with respect to the conventional configuration. In addition, it is also easy to improve the existing apparatus to improve the accuracy.
The above objects, features, aspects and advantages of the present invention and other objects, features, aspects and advantages will become apparent from the following detailed description of the present invention read in conjunction with the accompanying drawings.
Drawings
Fig. 1 is a diagram schematically showing the overall configuration of a gas measurement device according to the present embodiment.
Fig. 2 is a block diagram showing the configuration of control device 30 in fig. 1.
Fig. 3 is a diagram for explaining signals input to the ports of the CPU.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the drawings. In the drawings, the same or corresponding portions are denoted by the same reference numerals, and description thereof will not be repeated.
Fig. 1 is a diagram schematically showing the overall configuration of a gas measurement device according to the present embodiment. The gas measurement device 1 shown in fig. 1 includes a sample gas line ML, a reference gas line RL, a switching valve 5, and a sample gas chamber 9.
The sample gas M is introduced into the sample gas line ML. The sample gas line ML includes: a filter 2 through which the sample gas M passes, a pump 3 that sends out the sample gas M, and a needle valve 4 that adjusts the flow rate of the sample gas M.
The reference gas R is introduced into the reference gas line RL. The reference gas line RL includes: a filter 12 through which the reference gas R passes, a pump 13 that sends out the reference gas R, and a needle valve 14 that adjusts the flow rate of the reference gas R.
The switching valve 5 includes a three-way valve 5M disposed in the sample gas line ML and a three-way valve 5R disposed in the reference gas line RL. The three- way valves 5M, 5R constitute flow paths as follows: in response to the selection signal SEL, the gas that has passed through one of the reference gas line RL and the sample gas line ML is sent to the sample gas chamber 9, and the gas that has passed through the other is discharged. By switching the selection signal SEL, the reference gas and the sample gas are alternately filled into the sample gas chamber.
The gas measurement device 1 further includes a motor 6, a sector 8, a light source 7, a detection unit 20, and a control device 30.
The sample cell 9 has a gas inlet 9a and a gas outlet 9b. The sample gas or the reference gas is supplied from the gas inlet 9a into the sample gas chamber 9 through the switching valve 5, and is discharged from the gas outlet 9b. A light source 7 for emitting infrared light is disposed at one end of the sample cell 9, and a detection unit 20 for detecting infrared light transmitted through the sample cell 9 is disposed at the other end of the sample cell 9.
A sector 8 for cutting off infrared light is provided between the light source 7 and the end of the sample gas cell 9. The segment 8 has a light shielding portion and a light transmitting portion. The sector 8 is configured to rotate around a sector rotation axis 8 e. When the light-transmitting portion is on the sample gas cell 9, infrared light is irradiated into the sample gas cell 9, and when the light-shielding portion is on the sample gas cell 9, irradiation of infrared light into the sample gas cell 9 is cut off. The control device 30 controls the rotational position of the sector 8 by the motor 6, and controls the drive of the switching valve 5 in synchronization with the rotation of the motor 6 based on the selection signal SEL.
The detector 20 includes a first detector 21 for detecting the measurement target gas and a second detector for detecting the calibration gas. The first detector 21 comprises a detector for detecting SO 2 SO as detection object 2 Detector 22, NO detector 23 for detecting NO, and CO for detecting COAnd a CO detector 24. The second detector comprises a second detector for detecting CO 2 CO as detection target 2 Detector 25 and detector CH 4 CH as detection target 4 A detector 26.
SO 2 NO and CO absorb light (SO) having a specific wavelength in the infrared region 2 :7.4 μm, NO:5.3 μm, CO:4.6 μm). Therefore, if the absorption of infrared light after passing through the measurement gas is measured by a detector sensitive to only each of these wavelengths, the concentration of each component can be measured.
Each detector is filled with a detection target gas in a sample gas, and detects an infrared light intensity of a frequency specific to the detection target gas based on a change in internal pressure. Then, the control device 30 that receives the detection output of the detection unit 20 performs predetermined signal processing to calculate a concentration value indicating the concentration of the measurement gas in the sample gas.
Fig. 2 is a block diagram showing the configuration of control device 30 in fig. 1. The structure of the gas measurement device 1 including the internal structure of the control device 30 will be described with reference to fig. 1 and 2.
The gas measurement device 1 includes: a sample gas chamber 9; a switching valve 5 that selectively supplies a reference gas and a sample gas to the sample gas chamber; a light source 7 for irradiating the sample cell with light; and a detection unit 20 that detects the intensity of light emitted from the light source 7 to the sample cell 9 after the light has transmitted through the sample cell 9.
The gas measurement device 1 further includes a control device 30. The control device 30 includes an interface circuit 36, a calculation unit (CPU) 31, a storage unit (memory) 32, a density display unit 33, an input unit 34, and an output unit 35. The user performs input for calibration, setting, and the like via the input unit 34. Further, the CPU 31 outputs a density value and the like from the output unit 35.
The interface circuit 36 transmits the detection signal detected by the detection section 20 to the CPU 31. The CPU 31 repeatedly analyzes the gas component in the sample gas based on the detection result of the detection section 20.
The detection unit 20 includes: a first detector 21 for detecting a gas component (SO) to be analyzed 2 NO, CO); to be provided withAnd CO 2 Detector 25 and CH 4 Detector 26 of the CO 2 Detector 25 and CH 4 The detector 26 detects each of a plurality of Components (CO) for interference correction of a gas component to be analyzed 2 、CH 4 ). The interface circuit 36 includes: a first signal processing unit (41, 42, 43) that preprocesses a detection signal of the first detector 21 so that the detection signal can be input to the CPU 31 and transmits the signal to the CPU 31; and a second signal processing unit (44) for converting CO into a signal 2 Detector 25 and CH 4 The detection signal of the detector 26 is preprocessed so as to be input to the CPU 31, and is alternately transmitted to the CPU 31 in a time-sharing manner.
The light irradiated from the light source 7 to the sample cell is infrared light. Further, even in a gas measurement apparatus using ultraviolet light, the calibration component can be alternately transmitted in time division as in the present embodiment.
The gas component to be analyzed contains SO 2 Gas, NO gas, and CO gas. The first detector 21 comprises an SO 2 A detector 22, a NO detector 23, and a CO detector 24. The plurality of components for interference correction include CH 4 Gas and CO 2 A gas. The CPU 31 has a first port P1, a second port P2, a third port P3, and a fourth port P4.
The first signal processing unit (41, 42, 43) has: a first preprocessing circuit 41 that preprocesses SO 2 The output signal of the detector 22 is preprocessed and output to the first port P1; a second preprocessing circuit 42 that preprocesses an output signal of the NO detector 23 and outputs the output signal to a second port P2; and a third preprocessing circuit 43 that preprocesses an output signal of the CO detector 24 and outputs the output signal to the third port P3.
The second signal processing unit 44 is configured to couple CH 4 Signals obtained by preprocessing the output signal of the detector 26 and CO 2 The output signal of the detector 25 is preprocessed and the resultant signal is alternately output to the fourth port P4.
The first preprocessing circuit 41 includes: analog circuit 51 that adjusts SO 2 The gain of the output signal of the detector 22; and a conversion circuit 52 to convertThe output of the analog circuit 51 is converted so as to be input to the first port P1.
The second preprocessing circuit 42 includes: an analog circuit 53 that adjusts the gain of the output signal of the NO detector 23; and a conversion circuit 54 that converts the output of the analog circuit 53 so as to be input to the second port P2.
The third preprocessing circuit 43 includes: an analog circuit 55 that adjusts the gain of the output signal of the CO detector 24; and a conversion circuit 56 that converts the output of the analog circuit 55 so as to be input to the third port P3.
The second signal processing section 44 includes: a second analog circuit 58 which adjusts CH 4 The gain of the output signal of detector 26; a third analog circuit 57 for adjusting CO 2 The gain of the output signal of the detector 25; a multiplexer 59 that alternately selects the output of the second analog circuit 58 and the output of the third analog circuit 57; and a second conversion circuit 60 that converts the output of the multiplexer 59 so as to be input to the fourth port P4.
With the above-described structure, in the present embodiment, CO is introduced 2 Signal sum CH of detector 25 4 The signals of the detectors are alternately switched in time and input to one port P4 to calculate CO respectively 2 Concentration and CH 4 And (4) concentration.
CO 2 And CH 4 All of which are objects of measurement for correcting interference and are not air pollution components SO which are main objects of measurement 2 NO, or CO to be measured for monitoring incomplete combustion as a measure against dioxin. Thus, for CO 2 And CH 4 Even if the signal from the detector is thinned out and the concentration calculation is performed to slightly increase the minimum detection limit (about 1.4 times), the gas measurement is not disturbed.
Fig. 3 is a diagram for explaining signals input to each port of the CPU. The ports P1 to P3 of the CPU 31 continuously receive signals from the corresponding detectors without switching. The control device 30 performs switching of the switching valve 52 times in a period of 1 cycle and 20 seconds by the selection signal SEL. The detection signal when the sample gas chamber 9 is filled with the reference gas R from the reference gas line RL is input in the first half of the 1 cycle and the 20 second cycle, and the detection signal when the sample gas chamber 9 is filled with the sample gas M from the sample gas line ML is input in the second half.
In fig. 3, R represents a detection signal (reference signal) when the sample gas chamber 9 is filled with the reference gas, and M represents a detection signal (measurement signal) when the sample gas chamber 9 is filled with the sample gas. The CPU 31 calculates the concentration of the measurement target gas in the sample gas by applying the reference signal and the measurement signal to a predetermined calculation formula.
Port P4 receives data from the CO for switching every 1 cycle for 20 seconds 2 Signal from detector 25 and from CH 4 The signal of the detector 26. The CPU 31 selects the a input and the B input of the multiplexer 59 as shown in fig. 3 using the selection signal SEL2. The selection signal SEL2 has a period 2 times as long as the selection signal SEL of the switching valve 5. CO for interference correction 2 、CH 4 The CPU 31 also calculates the concentration of the measurement target gas in the sample gas by applying the reference signal and the measurement signal to a predetermined arithmetic expression. The frequency of updating the concentration is determined by the SO as the main analysis object 2 The ratio of NO to CO is half of the update frequency. In the present embodiment, the selection signal SEL2 is output from the CPU 31, but it is also possible to generate SEL2 in the second signal processing unit 44 using the selection signal SEL by providing a frequency dividing circuit in the second signal processing unit 44.
It is also easy to realize the gas measuring apparatus of the present embodiment by improving the existing gas measuring apparatus. For example, only CO as an interference component is corrected and CH as an interference component is not corrected by the same configuration as the preprocessing circuits 41 to 43 in place of the second signal processing unit 44 4 If each preprocessing circuit 41 is composed of 1 replaceable substrate, the correcting device of (1)It is also possible to introduce CH as an interference component by replacing 1 substrate of the conventional substrates with the substrate of the second signal processing unit 44 and changing the arithmetic processing of the CPU 31 by software change 4 The correction of (2).
In this case, since it is easy to modify the existing delivered goods, the device modification time is only about half a day, and therefore, the measurement time can be shortened, and the man-hours of the service staff can be suppressed.
In the above-described embodiment, the case where the gas components to be detected are 3 types and the gas components for noise correction are 2 types has been described, but the number of them may be changed. The gas components to be detected may be 1 to 2 or 4 or more. Further, the number of gas components for the disturbance correction may be 3 or more. Even in this case, the number of ports to be used can be reduced by using 1 port for each 1 component of the gas component to be detected and sequentially inputting the gas component for interference correction to 1 port of the CPU in a time-division manner.
In addition, although the infrared gas analyzer using the reference gas has been described in the present embodiment, the same idea can be applied to an infrared gas analyzer that does not use the reference gas and performs concentration calculation only with a measurement signal of the sample gas, and an infrared gas analyzer that does not circulate the reference gas and uses a reference gas chamber obtained by filling and sealing a gas chamber.
[ means ]
It will be appreciated by those skilled in the art that the above exemplary embodiments are specific in the following manner.
(first item)
The disclosed gas measurement device is provided with: a sample gas chamber filled with a sample gas; a light source that irradiates light to the sample gas cell; a detection unit that detects the intensity of light transmitted through the sample gas cell from the light source to the sample gas cell; a central processing unit that repeatedly analyzes the gas component in the sample gas based on the detection result of the detection unit; and an interface circuit that transmits the detection signal detected by the detection unit to the central processing unit 31. The detection section includes: a first detector that detects a gas component to be analyzed in the sample gas; and a plurality of second detectors that detect a plurality of components for interference correction used for interference correction of a gas component to be analyzed. The interface circuit includes: a first signal processing unit that preprocesses a detection signal of the first detector so that the detection signal can be input to the central processing unit, and transmits the signal to the central processing unit; and a second signal processing unit that preprocesses detection signals of the plurality of second detectors so that the detection signals can be input to the central processing unit, and sequentially transmits the detection signals to the central processing unit in a time-sharing manner. With this configuration, even when the number of input ports of the central processing unit is small, the detection results of the plurality of components for the interference correction can be processed by the central processing unit.
(second item) preferably, the light irradiated from the light source to the sample cell is infrared light.
(third item) more preferably, the gas component to be analyzed contains SO 2 Gas, NO gas, and CO gas. The first detector comprises SO 2 A detector, a NO detector, and a CO detector. The plurality of components for interference correction comprise CH 4 Gas and CO 2 A gas. The plurality of second detectors include CH 4 Detector and CO 2 A detector. The central processing unit has a first port, a second port, a third port and a fourth port. The first signal processing unit includes: a first preprocessing circuit for preprocessing SO 2 The output signal of the detector is preprocessed and output to a first port; a second preprocessing circuit that preprocesses an output signal of the NO detector and outputs the output signal to a second port; and a third preprocessing circuit that preprocesses an output signal of the CO detector and outputs the output signal to a third port. The second signal processing unit is configured to pair CH 4 Signal obtained by preprocessing output signal of detector and CO 2 The output signal of the detector is preprocessed and the preprocessed signal is alternately output to the fourth port.
(the first one isFour) more preferably, the first to third preprocessing circuits each include: a first analog circuit that adjusts a gain of an output signal of a corresponding detector; and a first conversion circuit that converts an output of the first analog circuit so as to be input to a corresponding one of the first to third ports. The second signal processing section includes: a second analog circuit for adjusting CH 4 A gain of an output signal of the detector; a third analog circuit for adjusting CO 2 A gain of an output signal of the detector; a multiplexer that alternately selects an output of the second analog circuit and an output of the third analog circuit; and a second conversion circuit that converts an output of the multiplexer so as to be input to the fourth port.
The embodiments of the present invention have been described, but the embodiments disclosed herein are not limited to the examples in all aspects. The scope of the present invention is indicated by the appended claims, and all changes that come within the meaning and range of equivalency of the claims are intended to be embraced therein.
Claims (4)
1. A gas measurement device is provided with:
a sample gas chamber filled with a sample gas;
a light source that irradiates light to the sample cell;
a detection unit that detects the intensity of light transmitted through the sample gas cell from the light source to the sample gas cell;
a central processing unit that repeatedly analyzes a gas component in the sample gas based on a detection result of the detection unit; and
an interface circuit that transmits the detection signal detected by the detection unit to the central processing unit,
wherein the detection section includes:
a first detector that detects a gas component to be analyzed in the sample gas; and
a plurality of second detectors that detect a plurality of components for interference correction used for interference correction of the gas component to be analyzed,
the interface circuit includes:
a first signal processing unit that preprocesses a detection signal of the first detector so that the detection signal can be input to the central processing unit, and transmits the signal to the central processing unit; and
and a second signal processing unit that preprocesses the detection signals of the plurality of second detectors so that the detection signals can be input to the central processing unit, and sequentially transmits the detection signals to the central processing unit in a time-division manner.
2. The gas measuring apparatus according to claim 1,
the light irradiated from the light source to the sample gas cell is infrared light.
3. The gas measuring apparatus according to claim 2,
the gas component to be analyzed contains SO 2 A gas, an NO gas, and a CO gas,
the first detector comprises an SO 2 A gas detector, an NO gas detector and a CO gas detector,
the plurality of components for interference correction include CH 4 Gas and CO 2 The gas is used for generating a gas, and the gas is used for generating a gas,
the plurality of second detectors include CH 4 Gas detector and CO 2 A gas detector for detecting the presence of a gas,
the central processing device has a first port, a second port, a third port and a fourth port,
the first signal processing unit includes:
a first pre-processing circuit to pre-process the SO 2 The output signal of the gas detector is preprocessed and output to the first port;
a second preprocessing circuit that preprocesses an output signal of the NO gas detector and outputs the output signal to the second port; and
a third pre-processing circuit that pre-processes an output signal of the CO gas detector and outputs the pre-processed output signal to the third port,
the second signal processing unit is configured to process the CH 4 Signal obtained by preprocessing output signal of gas detector and CO 2 The output signal of the gas detector is output to the fourth port alternately.
4. The gas measuring apparatus according to claim 3,
the first to third preprocessing circuits each include:
a first analog circuit that adjusts a gain of an output signal of a corresponding detector; and
a first conversion circuit that converts an output of the first analog circuit so as to be input to a corresponding one of the first to third ports,
the second signal processing section includes:
a second analog circuit that adjusts the CH 4 Gain of the output signal of the gas detector;
a third analog circuit that adjusts the CO 2 Gain of the output signal of the gas detector;
a multiplexer that alternately selects an output of the second analog circuit and an output of the third analog circuit; and
a second conversion circuit that converts an output of the multiplexer so as to be input to the fourth port.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2021094406A JP2022186267A (en) | 2021-06-04 | 2021-06-04 | gas measuring device |
| JP2021-094406 | 2021-06-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115436329A true CN115436329A (en) | 2022-12-06 |
Family
ID=84241029
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210558802.9A Pending CN115436329A (en) | 2021-06-04 | 2022-05-20 | Gas measuring device |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2022186267A (en) |
| CN (1) | CN115436329A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001330562A (en) * | 2000-05-23 | 2001-11-30 | Shimadzu Corp | Infrared gas analyzer |
| CN101587068A (en) * | 2009-05-27 | 2009-11-25 | 陈小英 | Multi-sensor gas analyzer |
| CN102007397A (en) * | 2008-04-15 | 2011-04-06 | 株式会社岛津制作所 | Gas analyzing apparatus with built-in calibration gas cell |
| CN202133610U (en) * | 2011-06-15 | 2012-02-01 | 西安毅达信息***有限公司 | Signal detection circuit of laser on-line detection system of smoke gas content |
| CN103149171A (en) * | 2011-12-06 | 2013-06-12 | 株式会社岛津制作所 | Combustion exhaust analysis device |
-
2021
- 2021-06-04 JP JP2021094406A patent/JP2022186267A/en active Pending
-
2022
- 2022-05-20 CN CN202210558802.9A patent/CN115436329A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001330562A (en) * | 2000-05-23 | 2001-11-30 | Shimadzu Corp | Infrared gas analyzer |
| CN102007397A (en) * | 2008-04-15 | 2011-04-06 | 株式会社岛津制作所 | Gas analyzing apparatus with built-in calibration gas cell |
| CN101587068A (en) * | 2009-05-27 | 2009-11-25 | 陈小英 | Multi-sensor gas analyzer |
| CN202133610U (en) * | 2011-06-15 | 2012-02-01 | 西安毅达信息***有限公司 | Signal detection circuit of laser on-line detection system of smoke gas content |
| CN103149171A (en) * | 2011-12-06 | 2013-06-12 | 株式会社岛津制作所 | Combustion exhaust analysis device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2022186267A (en) | 2022-12-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7030381B2 (en) | Method for detecting a gas using an infrared gas analyser and gas analyser suitable for carrying out said method | |
| CN102954939B (en) | The method and system of the moisture in detection natural gas | |
| US5077469A (en) | Calibrating a nondispersive infrared gas analyzer | |
| US5125747A (en) | Optical analytical instrument and method having improved calibration | |
| CN102007397B (en) | It is mounted with the gas analyzing apparatus of correction air chamber | |
| US9234905B2 (en) | Method of calibrating and calibration apparatus for a moisture concentration measurement apparatus | |
| JP6513762B2 (en) | Analyzer, program for analyzer and analysis method | |
| CN105548075A (en) | Device and method for detecting oxygen content in glass medicine bottle | |
| US8044353B2 (en) | Non-dispersive infrared gas analyzer | |
| CN112763443B (en) | Carbon dioxide sensor, calibration method and online detector | |
| CN109085133B (en) | Off-axis integral cavity atmosphere CH based on real-time reflectivity correction4Concentration measuring device and measuring method thereof | |
| KR20080085747A (en) | Method and apparatus for gas concentration quantitative analysis | |
| US8035816B2 (en) | Method and apparatus for measuring the optical absorption of samples | |
| US20060255278A1 (en) | Gas Sensor Arrangement and Measuring Method for Improving Long-Term Stability | |
| CN115436329A (en) | Gas measuring device | |
| JP7042742B2 (en) | Wide range gas detection method using infrared gas detector | |
| CN102980871B (en) | Optical gas analytical equipment | |
| CN105531579A (en) | Method for determining the concentration of a substance in a deformable container | |
| CN108896511A (en) | A kind of intelligent method for repairing the deformation of spectroanalysis instrument spectrogram | |
| JPH10104215A (en) | Absorbance detector, chromatographic device, absorbance detecting method, and chromatographic analyzing method | |
| JP2945050B2 (en) | Method for determining performance degradation of zero gas generator in ozone concentration measurement device | |
| CN110231313B (en) | Online zero calibration method and device for laser gas analyzer | |
| US20230375468A1 (en) | Multi-monochromatic light source system for slope spectroscopy | |
| JP2009058527A (en) | Ndir photometer for measuring multiple components | |
| SU693172A1 (en) | Method of continuously measuring the quantity of substance in moving paper web |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |