Connection Of The Negative Pressure Line - Siemens SITRANS P Series Operating Instructions Manual

Connection of the negative pressure line

Measurement in 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.
Measurement assembly on an open container
h Lower filling height
U
h Upper filling height
O
p Pressure
SITRANS P, DS III series (7MF4.33.. 7MF4.34.. 7MF4.35..)
A5E03434645-01, 08/2011
+
Δp
MA
Δp
ME
ρ
g
Formula:
Start of scale value: p
Full scale value: p
ME
Start of scale value
Full scale value
Density of the measured medium in the
container
Acceleration due to gravity
= ρ · g · h
MA U
= ρ · g · h
O
17