VEGA VEGAPULS 68 (≥ 2.0.0 - ≥ 4.0.0) 4 … 20 mA_HART - two-wire - Manual (Page 14)

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4 Mounting
VEGAPULS 68 • 4 … 20 mA/HART - two-wire
36535-EN-130205
4 Mounting
4.1 General instructions
With instruments with threaded process fitting, suitable tools must be
applied for tightening the hexagon.
Warning:
The housing must not be used to screw the instrument in! Applying
tightening force can damage internal parts of the housing.
Use the recommended cables (see chapter "Connecting to power
supply") and tighten the cable gland.
You can give your instrument additional protection against moisture
penetration by leading the connection cable downward in front of
the cable entry. Rain and condensation water can thus drain off. This
applies mainly to outdoor mounting as well as installation in areas
where high humidity is expected (e.g. through cleaning processes) or
on cooled or heated vessels.
Make sure that all parts of the instrument exposed to the process, in
particular the active measuring component, process seal and process
fitting, are suitable for the existing process conditions. These include
above all the process pressure, process temperature as well as the
chemical properties of the medium.
You can find the specifications in chapter "Technical data" and on the
type label.
4.2 Mounting preparations - Horn antenna
The instrument is also available in versions with an antenna whose
diameter is larger than the process fitting (thread, flange). In such ca-
ses the antenna must be disconnected from the process fitting before
mounting. Proceed as follows:
1. Loosen the hexagon socket screws (3) on the antenna socket
with an Allen wrench (size 3)
2. Remove the antenna (4)
Note:
The plastic cone may not be pulled out of the antenna socket.
3. Insert the antenna from below into the vessel socket and secure it
against falling off
4. Retighten the antenna with hexagon screws to the antenna so-
cket; torque max. 2.5 Nm (1.8 lbf ft)
Note:
The radar sensor with rinsing air connection or antenna extension
is provided with a notch on the antenna socket. This notch must be
aligned with the marking on the process fitting (the marking specifies
the position of the polarisation plane of the radar signal).
Screwing in
Moisture
Suitability for the process
conditions