Rosemount Tank Radar AB 5900 用户手册

300520EN, Rev AA
November 2009

3-39

Rosemount 5900 Series

Section 3. Installation

The electronics housing has entries for ½ - 14 NPT. Optional M20×1.5, 
minifast and eurofast adapters are also available. The connections are made 
in accordance with local or plant electrical codes.

Make sure that unused ports are properly sealed to prevent moisture or other 
contamination from entering the terminal block compartment of the electronics 
housing.

NOTE!
It is recommended that a sealant is used on the cable entry threads to prevent 
water from entering the housing interior.

NOTE!
Use the enclosed metal plugs to seal unused ports. The orange plastic plugs 
mounted at delivery are not sufficient as seal!

The housing should always be grounded in accordance with national and 
local electrical codes. Failure to do so may impair the protection provided by 
the equipment. The most effective grounding method is direct connection to 
earth ground with minimal impedance. There are three grounding screw 
connections provided. Two are located inside the Field Terminal side of the 
housing and the third is located on the housing. The internal ground screws 
are identified by a ground symbol: 

NOTE!
Grounding the transmitter via threaded conduit connection may not provide 
sufficient ground.

Signal wiring of the fieldbus segment can not be grounded. Grounding out 
one of the signal wires will shut down the entire fieldbus segment.

To protect the fieldbus segment from noise, grounding techniques for shield 
wire usually require a single grounding point for shield wire to avoid creating a 
ground loop. The ground point shall be located at the power supply.

The Raptor devices are designed for “daisy-chain” connection of shield wiring 
in order to enable a continuous shield throughout the Tankbus network.