VEGA VEGAPULS 63 (≥ 2.0.0 - ≤ 3.8) 4 … 20 mA_HART - four-wire - Manual (Page 14)

4 .2 Instructions for installation
T he flange screws of VEGAPULS 63 must be always screwed with the
torque stated in the technical data so that the PTFE washer of the
encapsulated antenna system seals.
Y ou can counteract the material-induced tension loss with PTFE by
doing the following:
1 M ake sure the number of flange screws corresponds to the
number of flange holes
2 U se disc springs in addition to the flange screws for fastening the
fl ange
3 T ighten the screws steadily with the torque specified in the
technical data
W hen mounting the VEGAPULS 63, keep a distance of at least
200 mm (7.874 in) to the vessel wall. If the sensor is installed in the
center of dished or round vessel tops, multiple echoes can arise.
T
hese can, however, be suppressed by an appropriate adjustment
( see chapter "Setup").
I f you cannot keep this distance you should carry out a false echo
storage before setup. This applies mainly if buildup on the vessel wall
is expected. In this case, we recommend repeating a false echo
storage later with existing buildup.
> 200 mm
(7.87")
Fig. 5: Mounting on round vessel tops
1 Reference plane
2 Vessel center or symmetry axis
I n vessels with conical bottom it can be advantageous to mount the
sensor in the center of the vessel, as measurement is then possible
down to the lowest point of the vessel bottom.
Mounting of instruments
with PTFE-coated flan-
ges
Mounting position
14 VEGAPULS 63 • 4 … 20 mA/HART - four-wire
4 M ounting
28441
-EN
-120530