Installation Instructions; Flange Bolting, Flanged Encapsulated Antenna Only - Siemens SITRANS LR250 PROFIBUS PA Operating Instructions Manual

Installing/mounting

4.3 Installation instructions

4.3 Installation instructions
For pressure applications, it will 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.) See Flange
bolting, Flanged encapsulated antenna only (Page 22) for FEA recommended torque
values.)
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 wall.
• Do not rotate the enclosure after programming and vessel calibration, otherwise an error
may occur, caused by a polarity shift of the transmit pulse.
Threaded versions
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.
For pressure applications see Warning above.
Flanged versions
See Flanged Horn with extension (Page 182), Raised-Face Flange per EN 1092-1 (Page 194),
Flat-Face Flange (Page 197), and Flanged encapsulated antenna (3"/DN80/80A sizes and
larger) (Page 188) for dimensions.
4.4

Flange bolting, Flanged encapsulated antenna only

Note
• Use spring washers
• Do not use additional gasket
• Use recommended torque values for tightening bolts
22
WARNING
SITRANS LR250 (PROFIBUS PA)
Operating Instructions, 01/2014, A5E32221386-AB