# US 8,771,597 B2 · Apparatus for the determination of a concentration of a component to be measured in a gas

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- Number: US 8,771,597 B2
- Document ID: US8771597B2
- Status: Granted
- Kind: B2
- Application number: 13/471,524
- Filed: 2012-05-15
- Published: 2013-02-14
- Granted: 2014-07-08
- Earliest claimed: 2011-05-16
- Assignees: Sick AG
- Applicants: Michael Zochbauer; Carsten Rogge; Dominikus Huttner
- Inventors: Michael Zochbauer; Carsten Rogge; Dominikus Huttner
- Web page: https://patentgrep.com/patent/US8771597B2

## CPC

- G01N 33/0024: {a chemical reaction taking place or a gas being eliminated in one or more channels}
- G01N 21/05: Flow-through cuvettes (G01N21/09 takes precedence; handling fluid samples G01N1/10)
- G01N 21/314: {with comparison of measurements at specific and non-specific wavelengths (dual wavelength spectrometry G01J3/427)}
- G01N 21/33: using ultraviolet light (G01N21/39 takes precedence)
- G01N 33/0044: {Sulphides, e.g. H2S}
- G01N 2021/3174: {Filter wheel}
- G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q)

## Abstract

The invention relates to an apparatus for the determination of a concentration of a component to be measured in a gas, comprising a light source, a wavelength selection unit, a measurement cuvette, a reference cuvette arranged in the optical beam path in parallel thereto, at least one light receiver and an evaluation unit which determines the concentration from the signals of the light receiver, wherein the gas to be analyzed is supplied to the measurement cuvette, on the one hand, and, on the other hand, to the reference cuvette via an absorption apparatus which includes a substance which completely absorbs the component to be measured. Further, the component to be measured is H2S and a wavelength selection unit is provided for the selection of an absorption wavelength.

## Claims

### Claim 1

An apparatus for the determination of a concentration of a component to be measured in a gas, comprising:
a light source (12);
a measurement cuvette (28) including an input opening and outlet opening, positioned to receive light from the light source;
an absorption apparatus having an inlet and an outlet, positioned in fluid communication with the measurement cuvette via the outlet opening of the measurement cuvette;
a reference cuvette (40) having an input opening and an outlet opening, arranged in the optical beam path in parallel to the measurement cuvette, the outlet of the absorption apparatus in fluid communication with the input end of the reference cuvette;
at least one light receiver (32, 44);
and an evaluation unit (34) which determines the concentration from the signals of the light receiver (32, 44),
wherein the gas to be analyzed is supplied to the measurement cuvette (28), on the one hand, and, on the other hand, via an absorption apparatus (50) which includes a substance which completely absorbs the component to be measured to the reference cuvette (40),
wherein the component to be measured is H2S and wherein a wavelength selection unit (13) is provided for the selection of an absorption wavelength (λAbs), and
wherein the gas to be analyzed flows serially, initially through the measurement cuvette (28) arranged to receive gas and discharge gas into the absorption apparatus (50), then through the absorption apparatus (50) arranged to receive gas and discharge gas into the reference cuvette (40), and is finally guided through the reference cuvette (40) arranged to receive gas and discharge gas.

### Claim 2 (depends on 1)

An apparatus in accordance with claim 1, wherein the absorption apparatus (50) is configured as a cartridge (54) arranged to receive gas and discharge gas, wherein the cartridge contains an absorber (56) which includes the absorbing substance.

### Claim 3 (depends on 2)

An apparatus in accordance with claim 2, wherein the absorber (56) includes silica gel as a carrier for the absorbing substance.

### Claim 4 (depends on 3)

An apparatus in accordance with claim 3, wherein the absorbing substance comprises elements of the fifth main group.

### Claim 5 (depends on 4)

An apparatus in accordance with claim 4, wherein the elements of the fifth main group are present in combination with halides.

### Claim 6 (depends on 4)

An apparatus in accordance with claim 4, wherein the absorbing substance includes a two-component buffer system having an acid with 0<pKs<2 as a first component and a hydroxide salt as a second component.

### Claim 7 (depends on 4)

An apparatus in accordance with claim 4, wherein the absorbing substance includes a hygroscopic halide compound.

### Claim 8 (depends on 2)

An apparatus in accordance with claim 2, wherein the loading of the absorber (56) with H2S is optically detectable.

### Claim 9 (depends on 8)

An apparatus in accordance with claim 8, wherein the loading of the absorber with H2S is optically detectable in terms of color.

### Claim 10 (depends on 1)

An apparatus in accordance with claim 1, wherein a respective light receiver is arranged to receive and transform light into an electric signal and pass to the evaluation unit (34), both for the light (26) passing through the measurement cuvette (28) and for the light (39) passing through the reference cuvette (40) and the evaluation unit (34) is configured to determine the concentration by means of the double formation of quotients.

### Claim 11

An apparatus for the determination of a concentration of a component to be measured in a gas, comprising:
a light source (12);
a measurement cuvette (28) including an input opening and outlet opening, positioned to receive light from the light source;
an absorption apparatus having an inlet and an outlet, positioned in fluid communication with the measurement cuvette via the outlet opening of the measurement cuvette;
a reference cuvette (40) having an input opening and an outlet opening, arranged in the optical beam path in parallel to the measurement cuvette the outlet of the absorption apparatus in fluid communication with the input end of the reference cuvette;
at least one light receiver (32, 44);
and an evaluation unit (34) which determines the concentration from the signals of the light receiver (32, 44),
wherein the gas to be analyzed is supplied to the measurement cuvette (28), on the one hand, and, on the other hand, via an absorption apparatus (50) which includes a substance which completely absorbs the component to be measured to the reference cuvette (40),
wherein the component to be measured is H2S and wherein a wavelength selection unit (13) is provided for the selection of an absorption wavelength (λAbs), and
wherein the gas to be analyzed is supplied in parallel to the measurement cuvette (38) arranged to receive gas and discharge gas into the absorption apparatus, on the one hand, and, on the other hand, via the absorption apparatus (50) arranged to receive and discharge gas into the reference cuvette (40), wherein a current matching apparatus (51) is arranged in the supply for the measurement cuvette (28) which, from a construction point of view, is of identical design to the first absorption apparatus (50), but does not include any substance absorbing the component to be measured.

### Claim 12 (depends on 11)

An apparatus in accordance with claim 11, wherein the absorption apparatus (50) is configured as a cartridge (54) arranged to receive gas and discharge gas, wherein the cartridge contains an absorber (56) which includes the absorbing substance.

### Claim 13 (depends on 12)

An apparatus in accordance with claim 12, wherein the absorber (56) includes silica gel as a carrier for the absorbing substance.

### Claim 14 (depends on 13)

An apparatus in accordance with claim 13, wherein the absorbing substance comprises elements of the fifth main group.

### Claim 15 (depends on 14)

An apparatus in accordance with claim 14, wherein the elements of the fifth main group are present in combination with halides.

### Claim 16 (depends on 14)

An apparatus in accordance with claim 14, wherein the absorbing substance includes a two-component buffer system having an acid with 0<pKs<2 as a first component and a hydroxide salt as a second component.

### Claim 17 (depends on 14)

An apparatus in accordance with claim 14, wherein the absorbing substance includes a hygroscopic halide compound.

### Claim 18 (depends on 12)

An apparatus in accordance with claim 12, wherein the loading of the absorber (56) with H2S is optically detectable.

### Claim 19 (depends on 18)

An apparatus in accordance with claim 18, wherein the loading of the absorber with H2S is optically detectable in terms of color.

### Claim 20 (depends on 11)

An apparatus in accordance with claim 11, wherein a respective light receiver is arranged to receive and transform light into an electric signal and pass to the evaluation unit (34), both for the light (26) passing through the measurement cuvette (28) and for the light (39) passing through the reference cuvette (40) and the evaluation unit (34) is configured to determine the concentration by means of the double formation of quotients.