Method for the direct presentation of a differential measured quantity in terms of its correct physical unit

Claim 1

A method for obtaining the direct measurement of a differential gas concentration in a gas analyzer comprising the steps of: measuring a detector output signal at a plurality of levels respectively corresponding to a plurality of input gas concentrations, said detector having a non-linear relationship between said plurality of levels and said plurality of input gas concentrations; plotting a characteristic curve in an absolute coordinate system based on said plurality of detector output signals and said plurality of input gas concentrations, said absolute coordinate system having a defined scaling; defining a reference value on said characteristic curve, said reference value corresponding to a level at which a differential gas measurement is to take place; using said reference value as an origin of a differential coordinate system, said differential coordinate system having a scaling equal to said scaling of said absolute coordinate system; measuring a concentration of a gas to be measured using said detector, said detector having an output level corresponding to said concentration of said gas to be measured; locating said output level along said characteristic curve; directly ascertaining a differential measurement value in said differential coordinate system based on said output level located on said characteristic curve; displaying said differential measurement value on said gas analyzer.

Claim 2

A method for obtaining the direct measurement of a differential gas concentration in a gas analyzer comprising the steps of: measuring a detector output signal at a plurality of levels respectively corresponding to a plurality of input gas concentrations, said detector having a non-linear relationship between said plurality of levels and said plurality of input gas concentrations; plotting a characteristic curve in an absolute coordinate system based on said plurality of detector output signals and said plurality of input gas concentrations, said absolute coordinate system having a defined scaling; defining a reference value on said characteristic curve, said reference value corresponding to a level at which a differential gas measurement is to take place; using said reference value as an origin of a differential coordinate system, said differential coordinate system having a scaling equal to said scaling of said absolute coordinate system; measuring a concentration of a gas to be measured using said detector, said detector having an output level corresponding to said concentration of said gas to be measured; locating said output level along said characteristic curve; directly ascertaining a differential measurement value in said differential coordinate system based on said output level located on said characteristic curve; displaying said differential measurement value on said gas analyzer.

Claim 5

A method for obtaining the direct measurement of a differential gas concentration value in a gas analyzer comprising the steps of: obtaining an absolute measurement with a detector, said detector having a first output signal level corresponding to a first gas concentration value; obtaining a differential measurement with said detector, said detector having a second output signal level; adding said first output signal level to said second output signal level in an arithmetic unit to obtain an output sum, said output sum corresponding to a second gas concentration value; subtracting said second gas concentration value from said first gas concentration value to obtain said differential gas concentration value; and, displaying said gas concentration value on said gas analyzer.

Claim 6

A method for obtaining the direct measurement of a differential gas concentration value in a gas analyzer comprising the steps of: obtaining an absolute measurement with a detector, said detector having a first output signal level corresponding to a first gas concentration value; obtaining a differential measurement with said detector, said detector having a second output signal level; adding said first output signal level to said second output signal level in an arithmetic unit to obtain an output sum, said output sum corresponding to a second gas concentration value; subtracting said second gas concentration value from said first gas concentration value to obtain said differential gas concentration value; and, displaying said gas concentration value on said gas analyzer.

Claim 7

A method for the direct presentation of a differential gas measurement, comprising the steps of: recording a characteristic curve in a first coordinate system, said characteristic curve representing a dependency between absolute output values of a detector and gas concentrations; defining a reference value on said characteristic curve, said reference value corresponding to a level at which a differential gas measurement between a gas under measurement and a comparison gas is to take place, said reference value defining an origin of a second coordinate system.

Claim 8

A method for the direct presentation of a differential gas measurement, comprising the steps of: recording a characteristic curve in a first coordinate system, said characteristic curve representing a dependency between absolute output values of a detector and gas concentrations; defining a reference value on said characteristic curve, said reference value corresponding to a level at which a differential gas measurement between a gas under measurement and a comparison gas is to take place, said reference value defining an origin of a second coordinate system.