Siemens SITRANS P DS III Operating Instructions Manual page 48

Pressure transmitter with hart
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Installing/mounting
4.4 "Level" installation
Measurement assembly on a closed container (strong
condensate formation)
h
U
h
O
h
V
p
The process connection on the negative side is a female thread
Lay the line for the negative pressure using a seamless steel tube 12 mm x 1.5 mm.
48
Lower filling level
Upper filling level
Gland distance
Pressure
Formula:
Start-of-scale value:
Δp
= g · (h
MA
Full-scale value:
Δp
= g · (h
MA
Δp
Start of scale value
MA
Δp
Full-scale value
ME
ρ
Density of the measured medium in
the container
ρ '
Density of fluid in the negative
pressure line corresponds to the
prevailing temperature there
g
Acceleration due to gravity
/
-18 NPT or an oval flange.
1
4
Operating Instructions, 06/2013, A5E00047092-09
· ρ- h
· ρ')
U
V
· ρ- h
· ρ')
O
V
SITRANS P DS III with HART

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