Siemens SITRANS P DS III - Page 57

Installing / mounting
4.5 "Remote seal" installation
SITRANS P DS III with PROFIBUS PA
Operating Instructions, 06/2013, A5E00053276-07
57
Note
Effects of temperature
Keep the following instructions in mind in order to minimize keep the effects of temperature
in remote sea
l measuring systems with the differential pressure measuring device:
Install the device such that the positive and negative sides are symmetrical as far as ambient
effects, especially ambient temperatures, are concerned.
Installation type for differential pressure and flow rate measurements
Installation type D
Start of scale value:
p
MA
= p
start
- ρ
oil
* g * H
V
Full
-scale value:
p
ME
= p
end
- ρ
oil
* g * H
V
Key
p
MA
Start of scale value
p
ME
Full
-scale value
p
start
Start of scale pressure
p
end
Full scale pressure
ρ
oil
Density of the filling oil in the capillary line of the remote seal
g
Acceleration due to gravity
H
V
Gland distance