Installation For Level; Connection Of The Negative Pressure Line - Siemens SITRANS P DS III Manual

● The measuring point must be as close as possible
● Vibration-free
● Within the permitted ambient temperature values
3.4.2

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.
3.4.3

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 Lower filling level
U
h Upper filling level
O
p Pressure
16
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 (7MF4.33.. 7MF4.34.. 7MF4.35..)
= ρ · g · h
MA U
= ρ · g · h
ME O
A5E03434626-03, 06/2013