Siemens SITRANS P DS III Manual page 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)
h Lower filling level
U
h Upper filling level
O
p Pressure
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)
h Lower filling level
U
SITRANS P DS III (7MF4.33.. 7MF4.34.. 7MF4.35..)
A5E03434626-03, 06/2013
Formula:
Start-of-scale value: Δp
Full-scale value: Δp
Δp Start of scale value
MA
Δp Full-scale value
ME
ρ Density of the measured medium in the container
g Acceleration due to gravity
Formula:
Start-of-scale value:
Δp
Full-scale value:
Δp
Δp Start of scale value
MA
= ρ · g · h
MA
= ρ · g · h
ME O
= g · (h · ρ- h · ρ')
MA U V
= g · (h · ρ- h · ρ')
MA O V
U
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