66
FLOWSIC30 · Operating Instructions · 8020999/173B/V1-4/2020-02 · © SICK Engineering GmbH
Maintenance and repair
Su
bj
ec
t t
o
ch
an
ge
w
ith
ou
t n
ot
ice
5.1
Routine checks
5.1.1
Comparing theoretical and measured Speed of Sound (SOS)
One of the most important criteria for the correct operation of a gas meter is the
consistency between the theoretical SOS, calculated for the actual gas composition,
temperature and pressure, and the SOS measured by the gas meter.
The Speed of Sound Calculator (SOS Calculator) available in FLOWgate
TM
calculates a
theoretical SOS for a specific gas composition at a specified temperature and pressure.
The calculation of thermodynamic properties is based on the “GERG-2004 XT08 Wide-
Range Equation of State for Natural Gases and other Mixtures”. The algorithms that are
implemented in the SOS calculator were developed by the Ruhr-University Bochum
(Germany).
5.1.2
Checking the meter health
The FLOWSIC30 provides the user with further details on alarms, warnings and status
information in the following manner:
● The LCD display indicates active system alarms and warnings. If a current error or
warning is active, a corresponding message will be displayed providing further
information on the event.
● The meter event list can be read via HART
®
● To get visual feedback about the meter‘s health, the “Device Information Bar” in the
FLOWgate
TM
operating software provides a compact overview (refer to FLOWgate
software manual).
▸
If any errors or warnings occurred, please refer to
5.1.3
Creating a parameter report
▸
Use the FLOWgate
TM
operating software to create a parameter report (refer to
FLOWgate Software Manual).
Please refer to the FLOWgate software manual or further details on the SOS
calculator.
