Emerson Rosemount 3051S MultiVariable Reference Manual page 87

Reference Manual
00809-0100-4803
Three-wire RTD
A four-wire Pt 100 RTD is required to maintain published performance specifications. A
three-wire Pt 100 RTD may be used with degraded performance. If connecting to a three-
wire RTD, use a four-wire cable to connect the Rosemount 3051SMV terminal block to the
RTD connection head. Within the RTD connection head, connect two of the same colored
wires from the Rosemount 3051SMV to the single colored wire of the RTD sensor.
Surges/transients
The transmitter will 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.
Optional transient protection terminal block
The transient protection terminal block can be ordered as an installed option (code T1 in
the transmitter model number) or as a spare part to retrofit existing Rosemount 3051SMV
in the field. For a complete listing of spare part numbers for transient protection terminal
blocks, refer to . A lightning bolt symbol on a terminal block identifies it as having transient
protection.
Note
Grounding the transmitter case using the threaded conduit connection may not provide a
sufficient ground. The transient protection terminal block (option code T1) will not
provide transient protection unless the transmitter case is properly grounded. See
Emerson.com/Rosemount
Figure 3-12: Rosemount 3051SMV RTD Wiring Connection
C
A. Ground lug
B. RTD cable assembly wires
C. Pt 100 RTD sensor
B
Installation
October 2018
A
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