4 Electrical installation
4.1 Connecting the cable(s) to the transmitter
The Rosemount 3100 Series is a two-wire loop-powered transmitter
accepting power supplies as follows:
• The 3101: 12 to 30 Vdc
• The 3102: 12 to 40 Vdc
• The 3105: 12 to 40 Vdc(non-hazardous area), 12 to 30 Vdc (hazardous
area)
Note
• To comply with the CSA approval requirements, the Rosemount 3101
and 3102 must be powered from a Rosemount 3490 Series Control Unit
or a class 2 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 the loop to avoid devices
being reset.
Each transmitter is supplied with two cable entries. A suitable conduit
system or cable gland must be used to maintain the weather-proof rating
and hazardous area protection. Any unused entry must be sealed with a
suitably rated blanking plug.
A two-core, shielded/screened cable is required for external power supply
and output signal connections. The cable is not supplied.
4.1.1 Hazardous area installation (Rosemount 3105 only)
When the Rosemount 3105 is used with a Rosemount 3490 Series Control
Unit, no additional safety barriers are required. If powering the Rosemount
3105 from any other source, ensure a suitable Intrinsically Safe (IS) barrier is
fitted in the non-hazardous (safe) area. The barrier must be chosen such that
its output parameters Uo, Io, and Po are less than Ui, Ii, and Pi of the
transmitter.
IS parameters: Ui = 30 V, li = 120 mA, Pi = 0.82 W, Li = 108 mH, Ci = 0 nF
The sum of the capacitance and the inductance of the transmitter and the
connecting cable must not exceed the maximum specified for the barrier
chosen.
Quick Start Guide August 2019
10 www.emerson.com
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