SICK FLOWSIC600-XT

98 FLOWSIC600-XT · Operating Instructions · 8018846/1BHP/V2-1/2021-05 · © SICK Engineering GmbH
Maintenance
Subject to change without notice
Fig. 47 Meter values
5.2.2
Comparing theoretical and measured sound velocity (SOS)
One of the main criteria for correct operation of an ultrasonic gas flow meter is conformity
between the theoretical sound velocity calculated for the actual gas composition,
temperature and pressure, and the sound velocity measured by the ultrasonic gas flow
meter.
The Speed of Sound Calculator (SOS Calculator) available in the FLOWgate™ operating soft-
ware calculates a theoretical SOS for a specific gas composition at a specified temperature
and pressure (→ Fig. 48). The calculation of thermodynamic properties is based optionally
on the “GERG-2008” or “AGA10” algorithm.
1 Connect FLOWSIC600-XT and FLOWgate™, → p. 86, §4.3.1.
2 Open “SOS Calculator” in the “Diagnostics” menu.
3 Select the gas composition and confirm with “Apply”. The gas composition can be
entered manually or loaded as file.
4 Enter the current process conditions and select “Calculate SOS”.
1
1 Diagnostic information
2 Measured SOS
3 System status
4 Status bar
2 43