Siemens SITRANS P DS III - Page 17

SITRANS P DS III (7MF4.33.. 7MF4.34.. 7MF4.35..)
A5E03434626-03, 06/2013
17
Assembly on a closed container
When taking measurements in a closed container without or with little condensate formation, the negative pressure line is
not filled. Lay the line in such a way that pockets of condensate do not form. Install a condensation container if required.
Measurement assembly on a closed container (no or little
condensate separation)
Formula:
Start
-of-scale value: Δp
MA
= ρ · g · h
U
Full
-scale value: Δp
ME
= ρ · g · h
O
h
U
Lower filling level
Δp
MA
Start of scale value
h
O
Upper filling level
Δp
ME
Full-scale value
p
Pressure
ρ
Density of the measured medium in the container
g
Acceleration due to gravity
When taking measurements in a closed container with strong condensate formation, you must fill the negative pressure line
(mostly with the condensate of the measured medium) and install a condensate pot. You can cut off the device using the
dual pneumatic block 7MF9001-2.
Measurement assembly on a closed container (strong condensate
formation)
Formula:
Start
-of-scale value:
Δp
MA
= g · (h
U
· ρ- h
V
· ρ')
Full
-scale value:
Δp
MA
= g · (h
O
· ρ- h
V
· ρ')
h
U
Lower filling level
Δp
MA
Start of scale value