50
Reference Manual
00809-0100-4108, Rev CA
Electrical Installations
March 2017
Electrical Installations
Transmitter case grounding
Always ground the transmitter case in accordance with national and local electrical codes.
The most effective transmitter case grounding method is a direct connection to earth
ground with minimal impedance. Methods for grounding the transmitter case include:
Internal ground connection: the internal ground connection screw is inside the FIELD
TERMINALS side of the electronics housing. This screw is identified by a ground symbol
( ). The ground connection screw is standard on all Rosemount 2088, 2090F, 2090P
transmitters. Refer to Figure 4-9 on page 50.
External ground connection: The external ground connection is located on the exterior of
the transmitter housing. Refer to Figure on page 50. This connection is only available
with option T1.
Figure 4-9. Internal Ground Connection
A. Internal ground location
B. External ground location
C. Positive
D. Negative
E. Test
Note
Grounding the transmitter case via threaded conduit connection may not provide sufficient
ground continuity.
Transient protection terminal block grounding
The transmitter can withstand electrical transients of the energy level usually encountered
in static discharges or induced switching transients. However, high-energy transients, such
as those induced in wiring from nearby lightning strikes, can damage the transmitter.
The transient protection terminal block can be ordered as an installed option (Option Code
T1) or as a spare part to retrofit existing Rosemount 2088, 2090F, and 2090P transmitters in
the field. See “Ordering information” on page 81 for part numbers. The lightning bolt
symbol shown in Figure 4-10 on page 51 identifies the transient protection terminal block.
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