Emerson Rosemount 5900S Quick Start Manual page 12

Quick Start Guide
3.3 Electrical requirements
3.3.1 Cable/conduit entries
The electronics housing has two entries for ½ - 14 NPT. Optional M20×1.5,
minifast and eurofast adapters are also available. The connections must be
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
Use the enclosed metal plugs to seal unused ports. The plastic plugs
mounted at delivery are not sufficient as seal!
Note
Thread sealing (PTFE) tape or paste on male threads of conduit is required to
provide a water/dust tight conduit seal and to meet the required degree of
ingress protection as well as to enable future removal of the plug/gland.
NPT is a standard for tapered threads. Engage the gland with 5 to 6 threads.
Note that there will be a number of threads left outside the housing as
illustrated below.
Figure 3-5: Cable Entry with NPT Threaded Gland
A. The NPT threaded gland leaves a number of threads outside the housing
Ensure that glands for the cable entries meet requirements for IP class 66
and 67.
3.3.2 Grounding
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 terminal compartment of the housing and the third is located on
12 Rosemount 5900S Radar Level Gauge
March 2020