# US 10,309,943 B2 · Infrared gas detector with secondary sensor

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- Number: US 10,309,943 B2
- Document ID: US10309943B2
- Status: Granted
- Kind: B2
- Application number: 15/771,675
- Filed: 2016-10-26
- Published: 2018-11-08
- Granted: 2019-06-04
- Earliest claimed: 2015-10-29
- Assignees: Inficon GmbH
- Applicants: INFICON GmbH
- Inventors: Johan Hellgren; Henrik Vennerberg; Fredrik Enquist
- Web page: https://patentgrep.com/patent/US10309943B2

## CPC

- G01N 33/0031: {comprising two or more sensors, e.g. a sensor array}
- G01N 21/3504: for analysing gases, e.g. multi-gas analysis
- G01N 21/61: Non-dispersive gas analysers {(G01N21/3504 takes precedence)}
- G01N 33/0022: {using a number of analysing channels}
- G01N 33/0032: {using two or more different physical functioning modes}
- G01N 33/0062: {concerning the measuring method or the display, e.g. intermittent measurement or digital display}
- 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

Infrared gas detection system comprising a gas inlet, an infrared gas analyzer connected to the gas inlet and a secondary gas sensor connected to the gas inlet, and an evaluation device evaluating the measurement signals from both the infrared gas analyzer and from the secondary gas sensor, such that a gas is identified only if both the infrared measurement signal and the secondary measurement signal coincide in time.

## Claims

### Claim 1

A method for detecting gas components analyzed by an infrared gas analyzer and a secondary gas sensor, comprising detecting an analyzed gas component as a specific gas component only, by evaluating when the measurement signals of both the infrared gas analyzer and the secondary gas sensor coincide with said gas component or coincide in time, wherein a measurement signal of the secondary gas sensor is employed for detection of the specific gas component only, by evaluating when a measurement signal of an infrared sensor of the infrared gas analyzer is below a predetermined threshold, and wherein the predetermined threshold is an electrical signal amplitude corresponding to a specific acceleration measured by the infrared sensor.

### Claim 2 (depends on 1)

The method according to claim 1, wherein a measurement signal from the infrared gas analyzer is employed as a reference signal for determining a current 0 ppm baseline of the secondary gas sensor, when the measurement signal from an infrared sensor of the infrared gas analyzer indicates 0 ppm of a specific gas component.