Flow Calibration
FLOWSIC600 · Technical Information · 8010125 V 4.0 · © SICK AG 83
Subject to change without notice
Figure 30 Signal window displaying ultrasonic signal on the "Path Diagnosis" page
Additionally the validity of the settings can be verified by checking the time plausibility and
the SOS:
Open the "Meter status" window (
Figure 25). If the indicator "Time plausibility" on tab
"Advanced or path status" is on, the zero phase is incorrect.
Open the "Meter values" page (select Meter / Meter values).
Check that the measured SOS values are almost the same at all paths of the
FLOWSIC600, and that they differ by less then 0.1% (
Figure 31),
Switch between display of absolute and difference SOS by clicking the right mouse
button on the SOS graph and using the context-menu).
Check that the measured SOS deviates no more than 0,3% from a theoretical SOS,
which is calculated from gas composition, pressure and temperature.
Figure 31 SOS per path on the "Meter values" page (left: absolute SOS, right: % difference to average)
In the case of very low gas velocities (< 1 m/s or 3 ft/s), there may be more
significant differences between the paths due to thermal stratification. In this
case, the SOS on the upper paths (1 and 2) will be higher than on the lower
paths.
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