INSTALLATION AND COMMISSIONING
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Manual USZ 08 · EN05 · 2015-06
20
Start-up
After the meter has been installed and the ERZ 2000 USC has been connected, the parameters of
the meter have to be checked on the computer. They are listed on the verification certificate of the
meter together with the coordinates. Parameters from the verification certificate without any
coordinate stated are directly stored in the ultrasonic electronic system of the measuring element
(IGM/USE 09). They can be found on the inspection certificate of the measuring element and can
be checked using the RMGView diagnostic software. In the case of a meter without an
ERZ 2000 USC, all parameters are programmed into the ultrasonic electronic system on the test
facility and it is not necessary to check them.
As soon as the meter is pressurized, it is possible to check its function. To do this, check the
velocities of sound measured for each path (lines 9 to 14) in column FH (Ultrasonic diagnosis) on
the ERZ 2000 USC. The velocity of sound varies with the gas composition, pressure and
temperature. The values of the individual paths should differ only slightly. However, a comparison
with the velocity of sound of the fluid can be made only to a limited extent, since such velocity of
sound can be determined only in a very inaccurate way under operating conditions.
If there is no flow rate available during start-up, thermal layering may occur in the piping, so that
the velocities of sound of the paths of different measuring planes may differ considerably from each
other.
If there is no ERZ 2000 USC available (model with totalizer on the meter case), the velocities of
sound (columns L to Q) can be read out using the RMGView software.
If the velocity of sound of a device with an ERZ 2000 USC should not be plausible, it is necessary to
perform troubleshooting using RMGView.
If the velocities of sound of the measuring element are OK, but not on the ERZ 2000, this is in most
cases due to the connection between the measuring element and the computer. In such a case,
check not only the cable but also the screening and earthing as well as the terminating resistor on
the ERZ 2000 USC. If only a single path has failed, it is likely that the fault is to be found in the
wiring of the path.
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