EP0467307A2
Expired / Lapsed
EP
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Gas analyzer
Assignee: Horiba Ltd
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Filing: 1991-07-16
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Granted: —
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Expires: 2011-07-16
Abstract
Abstract According to the present invention, a first sample gas line (1) through which a sample gas (G) passes as it is, and a second sample gas line (2) branched from said first sample gas line (1) and provided with a treatment portion (3) for treating a specified ingredient in said sample gas or a first sample gas line and a second sample gas line, through which sample gases independent and different to each other pass, respectively, and a zero gas line (15), through which a zero gas (Z) passes, are connected with a single analytical portion (14) so that they may be parallel to each other. The sample gas (G) passing through said first sample gas line (1) and the sample gas (G') passing through said second sample gas line (2) being alternately introduced into said analytical portion (14) through said zero gas (Z) by means of a gas-controlling mechanism (17) to divide an output from the analytical portion (14) at that time into signals based on a plurality of modulation frequencies different to each other relating to said switch-over cycle, respectively, and these signals being added and subtracted to detect said concentrations of the same ingredient contained in the respective sample gases.
Inventors
- 👤 Norio Kada
- 👤 Naoki Noguchi
- 👤 Takao Imaki
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 21:12
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/0004; G01N33/0009; G01N33/0027; G01N33/0036; G01N33/0037; G01N33/0022; Y; Y02; Y02A; Y02A50/00; Y02A50/20
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
344 words
A gas analyzer, characterized in that a first sample gas line (1), through which a sample gas (G) passes as it is, a second sample gas line (2) branched from said first sample gas line (1) and provided with a treatment portion (3) for treating a specified ingredient in said sample gas and a zero gas line (15), through which a zero gas (Z) passes, are connected with a single analytical portion (14) so that they may be parallel to each other, the sample gas (G) passing through the first sample gas line (1) and the sample gas (G'), which has been treated, passing through said second sample gas line (2) being alternately introduced into said analytical portion (14) through said zero gas (Z) by means of a gas-controlling mechanism (17) to divide an output from the analytical portion (14) at that time into signals based on a plurality of modulation frequencies different to each other relating to said switch-over cycle, respectively, and these signals being added and subtracted to detect said concentrations of said ingredients contained in the sample gas. 2. A gas analyzer, characterized in that a first sample gas line (61) and a second sample gas line (62), through which sample gases (Gi, G 2 ) independent and different to each other pass, respectively, and a zero gas line (63), through which a zero gas (Z) passes, are connected with a single analytical portion (14) so that they may be parallel to each other, said sample gas (61) passing through said first sample gas line (61) and said sample gas (62) passing through said second sample gas line (62) being alternately introduced into said analytical portion (14) through said zero gas (Z) by means of a gas-controlling mechanism (64) to divide an output from the analytical portion (14) at that time into signals based on a plurality of modulation frequencies different to each other relating to said switch-over cycle, respectively, and these signals being added and subtracted to detect said concentrations of the same ingredient contained in the respective sample gases.
Claim 2
Dependent Claim
344 words
A gas analyzer, characterized in that a first sample gas line (1), through which a sample gas (G) passes as it is, a second sample gas line (2) branched from said first sample gas line (1) and provided with a treatment portion (3) for treating a specified ingredient in said sample gas and a zero gas line (15), through which a zero gas (Z) passes, are connected with a single analytical portion (14) so that they may be parallel to each other, the sample gas (G) passing through the first sample gas line (1) and the sample gas (G'), which has been treated, passing through said second sample gas line (2) being alternately introduced into said analytical portion (14) through said zero gas (Z) by means of a gas-controlling mechanism (17) to divide an output from the analytical portion (14) at that time into signals based on a plurality of modulation frequencies different to each other relating to said switch-over cycle, respectively, and these signals being added and subtracted to detect said concentrations of said ingredients contained in the sample gas. 2. A gas analyzer, characterized in that a first sample gas line (61) and a second sample gas line (62), through which sample gases (Gi, G 2 ) independent and different to each other pass, respectively, and a zero gas line (63), through which a zero gas (Z) passes, are connected with a single analytical portion (14) so that they may be parallel to each other, said sample gas (61) passing through said first sample gas line (61) and said sample gas (62) passing through said second sample gas line (62) being alternately introduced into said analytical portion (14) through said zero gas (Z) by means of a gas-controlling mechanism (64) to divide an output from the analytical portion (14) at that time into signals based on a plurality of modulation frequencies different to each other relating to said switch-over cycle, respectively, and these signals being added and subtracted to detect said concentrations of the same ingredient contained in the respective sample gases.
Claim 3
Dependent Claim
69 words
The gas analyzer as set forth in claim 1 or claim 2, wherein said output from the analytic portion (14) is divided into said signals based on a plurality of modulation frequencies different to each other relating to the switch-over cycle by means of two treating lines (25, 26) each comprising a band pass filter (27, 30), a synchronous detecting circuit (28, 31) and a gain-regulating circuit (29, 32).
Claim 4
Dependent Claim
52 words
The gas analyzer as claimed in one of the claims 1 to 3, characterized in that the open periods of the gas-controlling mechanism (17) for the gas passing through the first sample gas line, the gas passing through the second sample gas line and the zero gas are equal to each other.
Claim 5
Dependent Claim
47 words
The gas analyzer as claimed in claim 4, characterized in that the period of the modulation frequency of the band pass filter (27, 30) in the first treating line (25)/second treating line (26) is twice/fourth as high as the open period of the gas-controlling mechanism (17)(Fig. 4).
References Cited (Backward Citations)
No citation records indexed.
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