Table of Contents
Advertisement
4.4.1
Option 4: Data input on fixed defaults
If there are no live data available for the gas analysis, then the gas data can be
stored as fixed values in the USM-GT-400. For the AGA-10 calculation these de-
fault values are used as fixed gas shares (AX-20 - AX-44; in chapter 10 the matrix
notation of parameters, measured values and variables will be explained). To
change these values, they have to be confirmed by selecting "Accept new Comp."
in parameters AX-11 and to be confirmed in "takeover gas components". Only
then they will be taken over as new values for the AGA-10 calculation.
1. Parameter AX-01 "AGA-10 Source"
Default data
2. Setting of the default values of the individual gas components
Parameter AX-20 to AX-44
Methane default value ....
....
Propene default value
3. Takeover with parameter AX-11 "AGA-10 Source"
"Taking over new components"
4.4.2
Data input on fixed defaults for air
In mode "default air" fixed values of air composition for the gas analysis can be
used. With the additional parameter "rel. humidity" in AX-06 the water content and
component is calculated in mol-% and the remaining components of the air are
normalized to 100%. The unnormalized default values for air are:
Nitrogen: 78,105 mol-%
Oxygen: 20,946 mol-%
Argon: 0,916 mol-%
Carbon dioxide: 0,033 mol-%
Water: 0,0 .. mol-% (calculated)
The water content is calculated via the relative humidity.
1. Parameter AX-01 "SoS source":
"Default air"
2. Setting of the default values relative humidity
Parameter AX-06 "relative humidity"
4 Functional principle – Ultrasonic-flow measurement
Manual USM GT400 · EN10 · May 2021
43
Advertisement
Table of Contents
