US 2025/0354967 A1 · METHOD FOR CALIBRATING SENSOR UNITS FOR DETERMINING A CONCENTRATION OF A GAS IN A GAS MIXTURE

Abstract

The present invention relates to a method for calibrating at least one sensor unit which is provided for determining a concentration of a gas in a gas mixture, wherein a limit value concentration (XG) is predetermined, comprising an initial calibration of the sensor unit at at least two concentrations (X1, X2) of the gas in a respective calibration gas mixture, at least comprising the steps of determining an initial zero point output (Y1) of the sensor unit with a first calibration gas mixture, determining a further output (Y2) of the sensor unit with a second calibration gas mixture, and forming an output straight line of the sensor unit based on the initial zero point output (Y1) and the further output (Y2), wherein the output line has an initial straight line slope (α). According to the invention, the method further comprises a recalibration at a later point in time, comprising the steps of determining a limit value output (YG′) of the sensor unit with a limit value gas mixture in which the concentration (XG) of the gas substantially corresponds to the limit value concentration (XG), and forming an updated output straight line of the sensor unit based on the limit value output (YG′) and the initial zero point output (Y1) or based on the limit value output (YG′) and the initial line slope (α).

Claims20

Dependent claims

A method of calibrating at least one sensor unit provided for determining a concentration of a predetermined gas in a gas mixture, the method comprising:

performing an initial calibration of the at least one sensor unit at using at least two calibration gas mixtures, wherein a first calibration gas mixture has a first predetermined concentration of the predetermined gas, wherein a second calibration gas mixture has a second predetermined concentration of the predetermined gas, and wherein performing the initial calibration comprises:
determining an initial zero point output of the at least one sensor unit with the first calibration gas mixture in which the first predetermined concentration of the predetermined gas is zero;
determining a further output of the at least one sensor unit with the second calibration gas mixture in which the second predetermined concentration of the predetermined gas is greater than a limit value concentration;
and
forming an output straight line of the at least one sensor unit based on the initial zero point output and the further output, wherein the output straight line has an initial line slope;
performing, after the initial calibration, a recalibration of the at least one sensor unit, wherein performing the recalibration comprises:
determining a limit value output of the at least one sensor unit with a limit value gas mixture having a concentration of the predetermined gas corresponding to the limit value concentration;
and
forming an updated output straight line of the at least one sensor unit based on the limit value output and the initial zero point output.

6 more elements

An analysis unit for gas mixtures, comprising:

at least one sensor unit designed to output sensor data representing a concentration of a predetermined gas in a gas mixture;
and
a control unit operatively coupled to the at least one sensor unit and designed to determine, while in a working mode, the concentration of the predetermined gas based on the sensor data, wherein the control unit is switchable between the working mode and a calibration mode, and wherein while in the calibration mode, the control unit is configured to perform a calibration method comprising:
performing an initial calibration of the at least one sensor unit using at least two calibration gas mixtures, wherein a first calibration gas mixture has a first predetermined concentration of the predetermined gas, wherein a second calibration gas mixture has a second predetermined concentration of the predetermined gas-and wherein performing the initial calibration comprises:
determining an initial zero point output of the at least one sensor unit with the first calibration gas mixture in which the first predetermined concentration of the predetermined gas is zero;
determining a further output of the at least one sensor unit with the second calibration gas mixture in which the second predetermined concentration of the predetermined gas is greater than a limit value concentration;
and
forming an output straight line of the at least one sensor unit based on the initial zero point output and the further output, wherein the output straight line has an initial line slope;
performing, after the initial calibration, a recalibration of the at least one sensor unit, wherein performing the recalibration comprises:
determining a limit value output of the at least one sensor unit with a limit value gas mixture having a concentration of the predetermined gas corresponding to the limit value concentration;
and
forming an updated output straight line of the at least one sensor unit based on the limit value output and the initial zero point.

9 more elements

Dependencies are inferred from the claim text.

Method for calibrating sensor units for determining a concentration of a gas in a gas mixture

Life of this patent

Method for calibrating sensor units for determining a concentration of a gas in a gas mixture

Life of this patent

Abstract

Claims20