Connecting The Transmitter - Emerson Rosemount 3107 Quick Start Manual

Quick Start Guide
5

Connecting the transmitter

Note
To comply with the Canadian Standards Association (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 Rosemount 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 communications and external power supply connections.
There are no cable conduit entries or covers to remove. The cable may be
cut to length on site or may be extended using a junction box and suitable
extension cable.
5.1 Installation in a non-hazardous area
Procedure
1. Make sure that the power supply is disconnected.
2. Connect the cable wires
voltage of 12 to 40 Vdc for non-hazardous applications.
5.2 Installation in a hazardous area
When the transmitters are 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:
Procedure
1. Make sure that the power supply is disconnected.
2. Connect the cable wires
voltage of 12 to 30 Vdc for hazardous applications.
16
(Figure 5-1), taking note of the required
(Figure 5-1), taking note of the restricted
Rosemount Ultrasonic 3107 Level and 3108 Flow Transmitters
August 2019