Quick Start Guide
11
September 2016
Note
The use of a pin or a ferrule wire terminal is not recommended as the connection may be
more susceptible to loosening over time or under vibration.
6. Reinstall the housing cover and tighten so the cover is fully seated with metal
to metal contact between the housing and cover in order to meet explosion
proof requirements.
Figure 10. Transmitter Wiring for RS-485 Bus
5.1 Grounding
Signal wire grounding
Do not run signal wiring in conduit or open trays with power wiring, or near heavy
electrical equipment. Ground the shield of the signal wiring at any one point on
the signal loop. The negative terminal of the power supply is a recommended
grounding point. Device must be properly grounded or earthed according to local
electric codes.
Transmitter case
Always ground the transmitter case in accordance with national and local
NOTICE
When the enclosed threaded plug is utilized in the conduit opening, it must be installed with a minimum
engagement of five threads in order to comply with explosion-proof requirements. Reference the
Rosemount 4088 MultiVariable Transmitter
Reference Manual
for more information.
Note
Installation of the transient protection terminal block does not provide transient protection
unless the transmitter housing is properly grounded.
A. RS-485 (A)
B. RS-485 (B)
C. RS-485 bus, twisted pair required
D. Bus Termination: AC Termination on 4088
(see
“Set the switches” on page 9
) or
120
resistor
E. User-provided power supply
D
D
B
A
C
E
Ω
Summary of Contents for 4088A MultiVariable
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