Siemens SITRANS P300 Operating Instructions Manual page 33

Procedure
To install the transmitter for level, proceed as follows:
1. Attach the seal to the container's mating flange.
2. Screw on the transmitter's flange.
3. Observe the installation position.
SITRANS P300 with HART communication
Operating Instructions, 06/2005, A5E00359579-02
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.
Installation
4.3 Installation for level version
4-7