System pressure – FMC Corporation - Talstar 80 Benutzerhandbuch
Seite 15
Proline Promass 80 PROFIBUS PA
Installation
15
a0003597
Fig. 7:
Installation in a vertical pipe (e.g. for batching applications)
1 = Supply tank , 2 = Sensor, 3 = Orifice plate, pipe restrictions (see Table), 4 = Valve, 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 vapor 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.
For this reason, the following installation locations are preferred:
• Downstream from pumps (no danger of vacuum)
• At the lowest point in a vertical pipe.
1
2
3
4
5
DN
Ø Orifice plate, pipe
restrictor
DN
Ø Orifice plate, pipe
restrictor
mm
inch
mm
inch
1
1/24"
0.8
0.03
40
1½"
22
0.87
2
1/12"
1.5
0.06
40 FB
1½"
35
1.38
4
1/8"
3.0
0.12
50
2"
28
1.10
8
3/8"
6
0.24
50 FB
2"
54
2.00
15
½"
10
0.40
80
3"
50
2.00
15 FB
½"
15
0.60
100
4"
65
2.60
25
1"
14
0.55
150
6"
90
3.54
25 FB
1"
24
0.95
250
10"
150
5.91
FB = Full bore versions of Promass I