Emerson 3107 Manuel D’Utilisation

December 2014

10



To comply with the CSA requirements, the transmitters must be powered from a 

Rosemount 3490 Series Control Unit, or a class 2 or separate extra-low voltage 
(SELV) source.



Other devices may reset if connecting the transmitter to a multi-drop system while the 

loop is powered. De-energize loop to avoid devices being reset.

The 3107 and 3108 are two-wire, loop-powered transmitters accepting external 

power supplies as follows: 



12 to 40 Vdc in a non-hazardous area



12 to 30 Vdc in a hazardous area

Each transmitter is supplied with a factory-fitted PVC sheathed, two-core, shielded 

cable for 

 and 

 connections. There are no cable 

conduit entries and no covers to remove. The cable may be cut to length on site or 
may be extended using a junction box and suitable extension cable.

Installation in a non-hazardous area

1. Make sure that the power supply is disconnected.
2. Connect the cable wires (

), taking note of the required voltage of

.

Installation in a hazardous area

When used with a Rosemount 3490 Series Control Unit, no additional safety barriers 

are required. If powering the transmitter from any other source, ensure a suitable 
Intrinsically Safe barrier is fitted in the non-hazardous (safe) area.

To connect the transmitter:
1. Make sure that the power supply is disconnected.
2. Connect the cable wires (

), taking note of the restricted voltage of

 

.

A. Remote Temperature Sensor (3108 Only)
B. Black: 0 Vdc
C. Red: 12 to 40 Vdc (non-hazardous area), 12 to 30 Vdc from protective barrier (hazardous area)
D. Non-hazardous Area: Connect Cable Screen To Standard Ground (Earth) or

Hazardous Area: Connect Cable Screen To I.S. Ground (Earth)