
4.5.2 Installation of the remote seal with the capillary line
Notes
●
Do not rest the measurement assembly on the capillary line.
● Do not bend capillary lines; risk of leakages and/or risk of considerable increase in the
setting time of the measuring system.
● Owing to the risk of bending and breakages, pay attention to mechanical overloads at the
joints such as capillary line-remote seal and capillary line-measuring device.
● Unwinding the excess capillary lines with a radius of at least 150 mm.
● Fasten the capillary line such that there are no vibrations.
● Permissible height differences:
– When installing the pressure measuring device above the measuring point, keep the
following in mind: the height difference of H
1max.
for remote seal measuring systems with
silicone, glycerin or paraffin oil filling. = 7 m must not be exceeded.
– If halocarbon oil is used as the filling liquid, this maximum height difference is only
H
1max.
= 4 m, see installation types A and B.
If negative overpressure is observed during measurements, reduce the permissible height
difference accordingly.
Installation type for gauge pressure and level measurements (open containers)
Installation type A
Pressure transmitter above the
measuring point
Start of scale value:
p
MA
= ρ
FL
* g * H
U
+ ρ
oil
* g * H
1
Full-scale value:
p
ME
= ρ
FL
* g * H
O
+ ρ
oil
* g * H
1
Installation type B
Installing/mounting
4.5 "Remote seal" installation
SITRANS P, DS III series with HART
Operating Instructions, 09/2012, A5E00047092-08 49
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