Maintenance - Endress+Hauser Proline Prosonic Flow 93 Operating Instructions Manual

Proline Prosonic Flow 93 FOUNDATION Fieldbus
!
Endress+Hauser
7

Maintenance

The flow measuring system Prosonic Flow 93 requires no special maintenance.
Exterior cleaning
When cleaning the exterior of measuring devices, always use cleaning agents that do not attack the
surface of the housing and the seals.
Coupling fluid
A coupling fluid is required to ensure the acoustic link between the sensor and the piping. This is
applied to the sensor surface during commissioning. Periodic replacement of the coupling fluid is
usually not required.
Note!
• Clean and reapply new coupling fluid when sensor is removed from the pipe.
• Avoid to use a thick layer of the coupling fluid (less is more).
• On rough pipe surface e.g. GRP pipes ensure that the gaps crevices within the surface roughness
are filled. Apply sufficient coupling fluid.
• On rough pipe surfaces where a thicken layer of coupling fluid has been applied the risk for dust
collection on washing away is present. In such cases it is recommended to seal the external gap
between the sensor holder and the pipe surface e.g. with.
• A change in the signal strength might indicate a change of the coupling fluid. No action is required
as long as the signal strength is higher than 50 dB.
Maintenance
91