VEGA VEGABAR 51 Profibus PA - Manual (Page 14)

14
4 Mounting
VEGABAR 51 • Profibus PA
36714-EN-130321
Instruments in the version "Oil and grease free for oxygen" should
be unpacked just before mounting. After the protective cover of the
process fitting has been removed, the label "O
2
" on the process fitting
is visible.
Danger:
Avoid oil, grease or contamination. Explosion danger!
4.2 Mounting steps
For mounting VEGABAR 51, a welded socket is required. You can find
these components in the supplementary instructions manual "Welded
socket and seals".
Seal the thread with resistant seal material on the process fitting
thread 1½ NPT.
→
Screw VEGABAR 51 into the welded socket. Tighten the hexagon
on the process fitting with a suitable wrench. Wrench size, see
chapter "Dimensions".
Warning:
The housing must not be used to screw the instrument in! Applying
tightening force can damage internal parts of the housing.
Seal the flange connections according to DIN/ANSI with a suitable,
resistant seal and mount VEGABAR 51 with suitable screws.
Use the seal suitable for the respective process fitting. You can find
the components in the supplementary instructions manual "Welded
socket and seals".
4.3 Mounting steps, tube isolating diaphragm
The isolating systems are temperature and pressure-aged at 80 °C
and 18 bar. The zero point is adjusted at 22 °C ±2 °C and a torque
of 275 Nm. The defined installation position is: Tube chemical seal
horizontal, VEGABAR 51 vertical.
For mounting proceed as follows:
1. Position VEGABAR 51 with tube chemical seal
2. Tighten the threaded fittings step-by-step once on the right and
on the left
3. Hold VEGABAR 51, to avoid distortion from the defined installa-
tion position.
Caution:
Apart from mounting, the tube chemical seal must not be permanently
under torsion.
4. Check current after mounting. The current must be between 3.9
and 4.1 mA. In case of a deviating value, losen threaded fitting
and mount again.
Oxygen applications
Welding the socket
Sealing/Screwing in
threaded versions
Sealing/Screwing in
flange versions
Sealing/Screwing in
hygienic fittings