Commissioning and Operation
FLOWSIC600-XT · Operating Instructions · 8018846/1BHP/V2-1/2021-05 · © SICK Engineering GmbH
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4.4.4
Checking the speed of sound
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Open the tile “Meter values” in the “Diagnostics” menu.
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Check the speed of sound (SOS).
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The speed of sound values must be almost identical on all paths of the FLOWSIC600-XT
and may only differ by less than 0.1%.
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When moving the mouse over the bar graphs, the current measured values are shown
in the diagram.
Fig. 45
Speed of sound
In the case of very low gas velocities (< 1 m/s or 3 ft/s), there may be more significant
differences between the sound velocities of the paths due to thermal stratification. In this
case, larger differences between the paths can also occur.
Ensure the measured SOS deviates no more than 0.3% from a theoretical SOS which is
calculated from gas composition, pressure and temperature
theoretical and measured sound velocity (SOS)”.
Further diagnostics values, e.g. velocity of gas (VOG), signal amplification (AGC), signal-to-
noise ratio (SNR), turbulence, symmetry and swirl are shown in the “Diagnostics / Meter
values” menu.
SOS absolute
SOS difference to average
