VEGA VEGADIF 55 4 … 20 mA_HART - Manual (Page 23)

Vacuum application
I
n applications under vacuum, we recommend mounting the pressure
transmitter below the lower isolating diaphragm. A vacuum load on the
isolating diaphragm due to the filling oil in the capillaries is thus
avoided.
W hen mounting the pressure transmitter above the lower isolating
diaphragm, the max. difference in height H1 must not be exceeded
according to the following illustrations. The max. difference in height
depends on the density of the filling oil and the smallest pressure
which can occur on the plus side of teh isolating diaphragm (empty
vessel), see following illustration.
+ –
+
–
H1
– +
Fig. 19: Mounting above the lower isolating diaphragm
VEGADIF 55 • 4 … 20 mA/HART 23
4 M ounting
31731
-EN
-081119