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Quick Installation Guide
00825-0100-4716, Rev DA
October 2009
Rosemount 3095 MultiVariable
12
STEP 4: CONNECT WIRING AND POWER UP (HART)
STEP 4: CONNECT WIRING AND POWER UP (HART)
Use the following steps to wire the transmitter:
1. Remove the housing cover on the side marked FIELD TERMINALS.
2. Connect the signal leads to the terminals.
NOTE
Do not connect the powered signal wiring to the test terminals. Power could damage the test
diode in the test connection. Shielded twisted pair cable should be used for best results. Use
24 AWG or larger wire and do not exceed 5,000 feet (1500 meters).
3. Plug and seal unused conduit connections.
4. Install wiring with a drip loop. Arrange the drip loop so the bottom is lower than the
conduit connections and the transmitter housing.
5. Replace the housing cover.
Figure 8 shows wiring connections necessary to power a 3095 and enable communications
with a hand-held HART communicator.
Figure 8. Transmitter Wiring Diagrams (4–20 man Power Supply)
The dc power supply should provide power with less than two percent ripple. The total
resistance load is the sum of the resistance of the signal leads and the load resistance of the
controller, indicator, and related pieces. Note that the resistance of intrinsic safety barriers, if
used, must be included.
Figure 9. Load Limitation
R
L
250
Current
Meter
24 Vdc Supply
Installation of the transient protection terminal block does not provide
transient protection unless the 3095 case is properly grounded.
Max. Loop Resistance = Power Supply Voltage-11.0
0.022
2000
Load (Ohms)
0
11.0 42.4
(1)
55
Operating
Region
(1) For CSA approval, power supply must not exceed 42.4 Vdc.
(2) HART protocol communication requires a loop resistance value between 250-1100 ohms, inclusive.
Power Supply
250
16.5
(2)