Siemens SITRANS P500 Kompaktbetriebsanleitung Seite 9

"Level" installation
Installation for level
Note
Seals are required for the installation. The seals must be compatible with the medium to be measured.
Seals are not included in the delivery.
Procedure
To install the transmitter for level, proceed as follows:
1. Attach the seal to the container's mating flange.
Ensure that the seal is centrically positioned and that it does not restrict the movement of the flange's seal diaphragm in
any way as otherwise the tightness of the process connection is not guaranteed.
2. Screw on the transmitter's flange.
3. Observe the installation position.
Connection of the negative pressure line to the closed vessel
When taking measurements in a closed container without or with little condensation formation, the negative pressure line is
not filled.
h Start of scale value
U
h Full scale value
O
p Pressure
Measurement assembly on a closed container:
no or little condensation separation
When taking measurements in a closed container with strong condensation formation, you must fill the negative pressure
line (mostly with the condensation of the measured medium) and install a condensation pot.
For measurement on open vessels there is no need to connect the minus pipework, since the minus side is open to the
atmosphere.
SITRANS P500 with HART
A5E02344532-02, 09/2010
Δp Start of scale value to be adjusted
MA
Δp Full scale value to be adjusted
ME
ρ Density of the measured medium in the
container
g Acceleration due to gravity
Formula:
Start of scale value
Δp = ρ · g · h
MA U
Full scale value
Δp = ρ · g · h
ME O
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