Installing The Lwt System; Rotating The Housing - ABB LWT300 series User Manual

Installing the LWT system

NOTICE
Installing the LWT system directly on the top of the vessel provides the best return
signal.
Once the probe and coupler/head assembly have been attached, you need to:
1 Insert the probe end into the flange, down the nozzle and to the bottom of the vessel.
2 Secure the coupler as necessary:
– If you have an NPT-style coupler, apply the proper sealant (or PFTE tape1) on the NPT threads and
screw the coupler in the NPT flange.
– If your coupler came in a flanged configuration, make sure that the appropriate gasket is installed
between the process and coupler flanges, and fix the flange with the appropriate nuts and bolts
to the torque required by the flange class.

Rotating the housing

To improve HMI visibility or field access to the wiring, you may rotate the LWT housing 360° from its
initial position, and fix it in any of these positions.
To rotate the housing:
1 With an hexagonal key, unscrew the coupler adapter security screw (see Figure 8) by no more than
one turn (do not pull out the screw). This should allow the housing to rotate freely.
—
Figure 8 Rotating the housing
2 Loosen the coupler adapter by a quarter turn.
3 Position the housing in a way that is optimal to your location.
4 Once the housing is in the proper position, re-tighten the coupler adapter.
5 Re-tighten the coupler adapter security screw to secure the coupler adapter.
1 PFTE tape needs to be applied very carefully to ensure good electrical contact between the coupler, the flange and (if conductive) the tank.
M4 hex head
locking screws
Coupler adapter security screw
19
Installing the LWT