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

Installing / mounting
4.4 "Level" installation
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.
Measurement assembly on an open container
h
U
h
O
p
50
Lower filling level
Upper filling level
Pressure
Formula:
Start of scale value: p
Full-scale value: p
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
SITRANS P DS III/P410 with PROFIBUS PA
Operating Instructions, 02/2016, A5E00053276-08
= ρ · g · h
MA U
= ρ · g · h
ME O