Installation With Remote Seal - Siemens SITRANS P Operating Instructions Manual

Installing/mounting

5.4 Installation with remote seal

To compensate the liquid column on the minus side, reset the zero point.
Measurement assembly on a closed container (strong condensate
formation)
h
U
h
O
h
V
p
The process connection on the negative side is a female thread
Lay the line for the negative pressure using a seamless steel tube 12 mm x 1.5 mm.
5.4 Installation with remote seal
Notes
● Keep the measuring system in the factory packing until it is installed in order to protect it from
mechanical damage.
● When removing from the factory packing and installing: ensure that damage to and
mechanical deformations in the membrane are prevented.
● Never loosen the sealed filling screws on the remote seal and the measuring instrument.
54
Lower filling level
Upper filling level
Gland distance
Pressure
Formula:
Lower range value:
Δp
MA
Upper range value:
Δp
MA
'
-
Δp Lower range value
MA
Δp Upper range value
ME
ρ Density of the measured medium in
the container
ρ ' Density of fluid in the negative pres‐
sure line corresponds to the prevailing
temperature there
g Acceleration due to gravity
/
1
4
SITRANS P320/P420 with 4 to 20 mA/HART
Operating Instructions, 11/2019, A5E44852162-AC
= g · (h · ρ - h · ρ')
U V
= g · (h · ρ - h · ρ')
O V
-18 NPT or an oval flange.