Installing/mounting
4.4 Installation instructions
SITRANS LR250 with FOUNDATION FIELDBUS
32
Operating Instructions, 09/2021, A5E32221411-AH
Note
•
On devices with a removable head, there is no limit to the number of times a device can
be rotated without damage.
•
When mounting, orient the front or back of the device towards the closest vessel wall or
obstruction.
•
Do not rotate the enclosure after programming and vessel calibration, otherwise an error
may occur, caused by a polarity shift of the transmit pulse.
4.4.1
Threaded versions
WARNING
Pressure applications
Danger of injury or poisoning.
It may be necessary to use PTFE tape or other appropriate thread sealing compound, and to
tighten the process connection beyond hand-tight. (The maximum recommended torque
for Threaded versions is 40 N-m (30 ft.lbs.)
1.
Before inserting the device into its mounting connection, check to ensure the threads are
matching, to avoid damaging them.
2.
Simply screw the device into the process connection, and hand tighten, or use a wrench.
4.4.2
Flanged versions
NOTICE
Improper materials
The user is responsible for the selection of bolting and gasket materials (except for Flanged
encapsulated antenna) which will fall within the limits of the process connection and its
intended use, and which are suitable for the service conditions.
Special Instructions for PTFE flanged encapsulated antenna only
Note
•
Use spring washers
•
Lens assembly acts as integral gasket, no other required
•
Use recommended torque values for tightening bolts