Quick Installation Guide
Rosemount 3095 MultiVariable
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
Figure 8. Transmitter Wiring Diagrams
24 Vdc Supply
Current RL≥ 250Ω
Meter
Installation of the transient protection terminal block does not provide transient protection unless the 3095 case is properly grounded.
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
Max. Loop Resistance = Power Supply
2000 | 0.022 |
|
Load (Ohms) |
| Operating |
|
250 |
| Region |
|
0 | 16.5(2) | 42.4(1) |
|
11.0 | 55 | ||
| Power Supply |
| |
(1)For CSA approval, power supply must not exceed 42.4 Vdc.
(2)HART protocol communication requires a loop resistance value between
12