KROHNE OPTISWITCH 4000C Transistor EN - Manual (Page 10)

The process fitting must be sealed if there is gauge or low
pressure in the vessel. Before use, check if the seal material is
resistant against the measured product and the process
temperature.
The max. permissible pressure is stated in the "Technical
data" in the "Supplement" or on the type label of the sensor.
The vibrating level switch is a measuring instrument and must
be treated accordingly. Bending the vibrating element will
destroy the instrument.
Warning:
The housing must not be used to screw in the instrument!
Applying tightening force on the housing can damage its
internal mechanical parts.
To screw in, use the hexagon above the thread.
4.2 Mounting instructions
For welded socket with O-ring in front and welding marking.
OPTISWITCH 4000 C has a defined thread runout point. This
means that every OPTISWITCH 4000 C is in the same position
after being screwed in. Remove therefore the supplied flat seal
from the thread of OPTISWITCH 4000 C. This flat seal is not
required when using a welded socket with front-flush O-ring.
Before welding, unscrew OPTISWITCH 4000 C and remove
the rubber ring from the welded socket.
The welded socket has a marking (notch). For horizontal
mounting, weld the socket with the notch facing upward or
downward; in pipelines aligned with the direction of flow.
Pressure/Vacuum
Handling
Welded socket
10 OPTISWITCH 4000 C - with transistor output
Mounting
31763
-EN
-060830