Vega VEGAPULS 64 Operating Instructions Manual page 22

4 Mounting
Mounting, PTFE threaded
adapter
22
Fig. 18: VEGAPULS 64 with flange and encapsulated antenna system
1 PTFE washer
2 Antenna encapsulation
After a certain time under the effect of large temperature changes,
PTFE plated flanges tend to lose their pre-tensioning. To compensate
for this, disc springs from the scope of delivery (instrument) must be
used with 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
Fig. 19: Use of disc springs
1 Disc spring
2 Sealing surface
3. Tighten screws with the necessary torque (see chapter "Technical
data", "Torques")
Note:
We recommend re-tightening the screws at regular intervals, depend-
ing on process pressure and temperature. Recommended torque
(see chapter "Technical data", "Torques").
PTFE threaded adapters are available for VEGAPULS 64 with thread
G1½ or 1½NPT. Due to this, only PTFE is in contact with the medium.
Mount the PTFE threaded adapter in the following way:
1
2
1
2
VEGAPULS 64 • HART and accumulator pack