Siemens SITRANS P310 with HART - Page 18

SITRANS P310 with HART
A5E35075329-01, 05/2015
17
● 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
Pressure transmitter belo
w 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
H
1
≤ 7 m (23 ft); with halocarbon oil as the filling liquid, only H
1
≤ 4 m(13.1 ft)
Key
p
MA
Start of scale value
p
ME
Full scale value
ρ
FL
Density of the process medium in the container
ρ
oil
Density of the filling oil in the capillary line of the remote seal
g
Acceleration due to gravity
H
U
Lower filling level
H
O
Upper filling level
H
1
Distance between the container flange and the pressure transmitter