15
4 Mounting
VEGACAL 64 • Two-wire 4 … 20 mA/HART
30030-EN-200929
Use a concentric tube in non-conductive products or linearize the
meas. signal.
Metric threads
In the case of instrument housings with metric thread, the cable
glands are screwed in at the factory. They are sealed with plastic
plugs as transport protection.
You have to remove these plugs before electrical connection.
NPT thread
In the case of instrument housings with self-sealing NPT threads, it is
not possible to have the cable entries screwed in at the factory. The
free openings for the cable glands are therefore covered with red dust
protection caps as transport protection.
Prior to setup you have to replace these protective caps with ap-
proved cable glands or close the openings with suitable blind plugs.
4.2 Mounting instructions
During operation, the probe must not touch any installations or the
vessel wall. The measured value can also change if the distance to
the vessel wall changes considerably. If necessary, secure the end of
the probe (insulated).
1
2
1
2
Fig. 6: Fasten the probe
1 Measuring probe
2 Plastic socket
In vessels with conical bottom it can be advantageous to mount the
sensor in the centre of the vessel, as measurement is then possible
down to the bottom.
If the instrument is mounted in the filling stream, unwanted false
measurement signals can be generated. For this reason, mount the
instrument at a position in the vessel where no disturbances, e.g. from
filling openings, agitators, etc., can occur.
This applies particularly to instrument versions with a longer probe.
Cable entries - NPT
thread
Cable glands
Installation position
Inflowing medium
