VEGA VEGADIF 34 … 51 - Manual (Page 45)

VEGADIF 34 … 51 45
20094-EN-030731
1 Inlet valves
2 Transmitter
3 Vent or drain valves
4 Block valves
5 Pressure tapping point
6 Vent screw
If due to constructional reasons the transmitter
must be mounted below the pressure tapping
point, a separator for impurities as well as a
blow down valve must be installed in the low-
est position of the impulse line.
1 Inlet valves
2 Transmitter
3 Vent or drain valves
4 Block valves
5 Pressure tapping point
6 Vent screw
7 Vent vale (impulse line)
6
4
1
5
7
-
3
2 +
6
4
1
5
-
3
2 +
1 Inlet valves
2 Transmitter
3 Vent or drain valves
4 Block valves
5 Pressure tapping point
6 Vent screw
If the transmitter is mounted above the pres-
sure tapping point, the vent or drain valves on
the process flange must be turned towards
the top. The impulse lines are provided with an
additional vent valve.
For this connection, the height difference „h“
between tapping point and measuring cell
center must be taken into account for adjust-
ment of zero and span (the liquid column acts
only on the plus side of the measuring cell). Installation connection for gases
For the pressure measurement of gases, the
transmitter should be preferably positioned
above the pressure tapping point The impulse
line must be connected to the plus side of the
transmitter. The minus side remains open to
the atmosphere. In a very dirty atmosphere
the use of a filter on the minus side or an open
tube bent down are recommended. This pro-
tects the minus side against buildup.
The impulse lines must be run with continuous
gradient so that condensation can drain off
automatically. If a gas contains impurities,
special pressure tapping sockets must be
used.
Installation connections