Siemens SITRANS P Betriebsanleitung Seite 49

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Seitenansicht 48
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Measurement assembly on a closed container (strong condensate
formation)
Formula:
Start-of-scale value:
Δp
MA
= g · (h
U
· ρ
- h
V
· ρ')
Full-scale value:
Δp
MA
= g · (h
O
· ρ- h
V
· ρ')
h
U
Lower filling level Δp
MA
Start of scale value
h
O
Upper filling level Δp
ME
Full-scale value
h
V
Gland distance ρ Density of the measured medium in the
container
p Pressure ρ ' Density of fluid in the negative pressure
line corresponds to the prevailing
temperature there
g Acceleration due to gravity
The process connection on the negative side is a female thread
1
/
4
-18 NPT or an oval flange.
Lay the line for the negative pressure using a seamless steel tube 12 mm x 1.5 mm.
4.5
"Remote seal" installation
4.5.1 Remote seal installation
General installation instructions
Keep the measuring system in the factory packing until it is installed in order to protect it
from mechanical damage.
When removing from the factory packing and installing: ensure that damage to and
mechanical deformations in the membrane are prevented.
Installing/mounting
4.5 "Remote seal" installation
SITRANS P, DS III series with HART
Operating Instructions, 09/2012, A5E00047092-08 47
Seitenansicht 48
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