
4.4.3 Connection of the negative pressure line
Assembly on an open container
A line is not required when taking measurements in an open container since the negative
chamber is connected with the atmosphere.
Ensure
that no dirt enters the open connection ports, for example by using connection screws
with a 7MF4997-1CP bleed valve.
+
)XOOVFDOHYDOXH
6WDUWRIVFDOHYDOXH
K
2
K
8
Measurement assembly on an open container
Formula:
Start of scale value: p
MA
= ρ ·
g · h
U
Full-scale value: p
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
Installing/mounting
4.4 "Level" installation
SITRANS P, DS III series with HART
Operating Instructions, 09/2012, A5E00047092-08 45
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