Endress+Hauser Turbimax W CUS31 Operating Instructions Manual page 10

Installation
10
3.2.5 Flow operation in the drinking water sector
(with special calibration)
When the sensor is ordered with assembly E or S, the sensor is individually calibrated in the
factory with the assembly ordered.
Therefore, no initial calibration on site is necessary.
1
P
2
3
P
1
P > P
2 1
5
P
2
7
P
1
P > P
2 1
Fig. 9: Installation situations with flow assembly E resp. S
1. Correct: pressure reduction after measurement
Degassing is avoided. The gas in the water remains dissolved.
2. Incorrect: Pressure reduction before measurement
The pressure reduction creates favourable conditions for gas bubble formation.
3. Correct: Outlet of the assembly raised and vented
Gas cannot collect in the upper section of the assembly. The outlet pipe is vented at the highest
point. A slight overpressure forms in the assembly as a result of the height difference of the
raised outlet.
4. Incorrect: Outlet raised but not vented
A low pressure forms in the assembly if venting via the downcomer outlet pipe does not take
place due to too small a cross-section.
5. Correct: Standard application in event of little initial pressure
Slight overpressure due to raised outlet level, no gas collecting in the upper section of the
assembly.
6. Limited application: The valve reduces the volume flow
!
Note!
The outlet line may not be too thin or too long as otherwise a low pressure forms in the
assembly. A vent for the drain line must be present. The outlet must be completely opened at
regular intervals as otherwise the raising of the outlet level would not make any sense.
If using a tube as the drain line, avoid formation of siphon draw (low points in the tube)!
Otherwise venting does not take place.
Turbimax W CUS31
2
P
2
4
P
1
P < P
2 1
6
P
2
8
P
P < P
1
2 1
Endress+Hauser
a0008121