24
4 Mounting
NCR-84 Two-wire 4 … 20 mA/HART
51141-EN-181127
Flange with encapsulated antenna system
Socket diameter d
Socket length h
50 mm
2"
≤ 200 mm
≤ 7.9 in
80 mm
3"
≤ 400 mm
≤ 15.8 in
100 mm
4"
≤ 500 mm
≤ 19.7 in
150 mm
6"
≤ 800 mm
≤ 31.5 in
The VEGAPULS 64 with flange and encapsulated antenna system,
the PTFE washer of the antenna encapsulation serves also as pro-
cess seal.
2
1
Fig. 18: VEGAPULS 64 with flange and encapsulated antenna system
1 PTFE washer
2 Antenna encapsulation
However, PTFE-plated flanges have a preload loss over time at high
temperature changes.
Note:
Therefore, use disc springs to compensate for this preload loss during
mounting. They are included in the scope of delivery of the instrument
and are intended for the flange screws.
To seal effectively, the following requirements must be fulfilled:
1. Make sure the number of flange screws corresponds to the num-
ber of flange holes
2. Use of disc springs as previously described
1
2
Fig. 19: Use of disc springs
1 Disc spring
2 Sealing surface
3. Tighten screws with the necessary torque (see chapter "
Technical
data
", "
Torques
")
Sealing to the process
925-0373 Rev A