Levelflex FMP51, FMP52, FMP54 PROFIBUS PA Mounting
Endress+Hauser 19
Shortening coax probes
Coax probes must be shortened if the distance to the container floor or outlet cone is less than
10 mm (0.4 in).
Coax probes can be shortened max. 80 mm (3.2 in) from the end. They have centering
units inside, which fix the rod centrally in the pipe. The centerings are held with borders
on the rod. Shortening is possible up to approx. 10 mm (0.4 in) below the centering unit.
The coax probe is shortened by sawing the pipe at the bottom end.
6.2.3 Mounting the device
Mounting devices with thread
A0012528
Devices with mounting thread are screwed into a welding boss or a flange and are usually also
secured with these.
• Tighten with the hexagonal nut only:
– Thread 3/4": Hexagonal wrench 36 mm
– Thread 1-1/2": Hexagonal wrench 55 mm
• Maximum permissible torque:
– Thread 3/4": 45 Nm
– Thread 1-1/2": 450 Nm
• Recommended torque when using the supplied aramid fibre seal and a process
pressure of 40 bar (580 psi):
– Thread 3/4": 25 Nm
– Thread 1-1/2": 140 Nm
• When installing in metal containers, take care to ensure good metallic contact
between the process connection and container.
Flange mounting
If a seal is used, be sure to use unpainted metal bolts to ensure good electrical contact
between probe flange and process flange.
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