Promass 40 3 Installation
Endress+Hauser 11
The proposed configuration in Fig. 5, however, permits installation in an open down
pipe. Pipe restrictors or the use of an orifice with a smaller cross-section than the nom-
inal diameter prevent the sensor from running empty while measurement is in progress.
Fig. 5: Installation in a down pipe (e.g. for batching applications)
1 Supply tank
2 Sensor
3 Choke, restrictor
4Valve
5 Batching tank
System pressure
It is important to ensure that cavitation does not occur, because it would influence the
oscillation of the measuring tube. No special measures need to be taken for fluids which
have properties similar to water under normal conditions.
In the case of liquids with a low boiling point (hydrocarbons, solvents, liquefied gases)
or in suction lines, it is important to ensure that pressure does not drop below the vapour
pressure and that the liquid does not start to boil. It is also important to ensure that the
gases that occur naturally in many liquids do not outgas. Such effects can be prevented
when system pressure is sufficiently high.
Consequently, it is generally best to install the sensor:
• downstream from pumps (no risk of partial vacuum)
• at the lowest point in a vertical pipe
Promass E / DN 8 15254050
Ø orifice / pipe restriction 6 mm 10 mm 14 mm 22 mm 28 mm
F06-xxxxxxxx-11-00-00-xx-002
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