20
4 Mounting
VEGAPULS 64 • 4 … 20 mA/HART - two-wire
51141-EN-160815
4.4 Mounting instructions
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. 9: VEGAPULS 64 with flange and encapsulated antenna system
1 PTFE washer
2 Antenna encapsulation
After a certain time, PTFE plated flanges have a normal voltage loss.
For compensation, disc springs must be used for the flange screws.
We recommended elastic washers or detent edged rings:
Screw size
Disc spring type Article no.
M16,
5
/
8
"
Detent edged ring
Gross VS KD
2.32880
M20,
3
/
4
"
Detent edged ring
Gross VS KD
2.32881
M24,
7
/
8
"
Retaining washer
Schnorr VS or S
2.32882
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
2
1
Fig. 10: Use of disc springs
1 Single disc spring
2 Laminated disc spring
3. Tighten screws with the necessary torque (see chapter "Technical
data")
Sealing to the process