Operating Instructions

Table Of Contents
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
Flange bolting: recommended torque
Pressure class Nominal pipe size (NPS) Number of bolts Recommended torque
(Nm)
ASME B16.5, Class 150 2" 4 30 – 50
3" 50 – 70
4" 8 40 – 60
6" 70 – 90
EN1092-1, PN16 /
JIS B 2220, 10K
DN50/50A 4 30 – 50
DN80/80A 8
DN100/100A
DN150/150A 60 – 80
Installing/mounting
4.4 Installation instructions
SITRANS LR250 with mA/HART
32 Operating Instructions, 10/2019, A5E32220602-AG