Installing the LWT 21Installing the LWT instrumentNOTICEInstalling the LWT system directly on the top of the vessel provides the best returnsignal.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 a proper sealant on the NPT threads and screw the couplerin the NPT flange.NOTICEAs much as possible, avoid using PTFE tape on the threaded connection as this typeof tape can affect the ground connection between the coupler and the tank. If PTFEtape is used, it shall be used in a very thin layer to avoid electrically isolating thecoupler from the tank.– If your coupler came in a flanged configuration, make sure that the appropriate gasket is installedbefore inserting the coupler assembly, and secure the flange with the appropriate nuts and boltsto the torque required by the flange class.Rotating the housingTo improve HMI visibility or field access to the wiring, you may rotate the LWT housing 360° from itsinitial position, and secure it in any of these positions.To rotate the housing:1 With an hexagonal key, slightly loosen the head adapter security screw (less than one full turn) (seeFigure 10).—Figure 10 Rotating the housingHead adapter security screwM4 hex headlocking screwsHead adapter
