Connection Of The Negative Pressure Line; Measurement In An Open Container - Siemens Sitrans P500 Operating Instructions Manual

Install
4.6 "Level" installation
Procedure
To install the pressure 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 pressure transmitter's flange.
3. Observe the installation position.
4.6.3

Connection of the negative pressure line

4.6.3.1

Measurement in an open container

Connection of the negative line is not necessary when measuring in an open container, since
the negative side is connected to the atmosphere.
h
U
h
O
p
Measurement assembly on an open container
42
Start of scale value
Full scale value
Pressure
Formula:
Start of scale value
p
MA
Full scale value
p
ME
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
Operating Instructions, 12/2014, A5E02344528-09
= ρ • g • h
U
= ρ • g • h
O
SITRANS P500 with HART