Reference Manual
00809-0200-4841, Rev BA
December 2014
Section 3: Installation
16
3.4
Electrical installation
3.4.1
Connecting the transmitter
The Rosemount 3490 Series is a two-wire loop-powered transmitter accepting power supplies
as follows:
12 to 40 Vdc in a non-hazardous area (ordinary location)
12 to 30 Vdc in a hazardous area (classified location)
Note
To comply with the CSA requirements, the transmitters must be powered from a
Rosemount 3490 Series Control Unit or 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 the loop to avoid devices being reset.
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
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.
See
“Wiring to allow HART communication” on page 18
if HART digital communication is
required.
Installation in a non-hazardous area (ordinary location)
The 3107 and the 3108 are suitable for non-hazardous (ordinary location) applications.
To connect the transmitter:
1.
Make sure that the power supply is disconnected.
2.
Connect the cable wires as shown in
, taking note of the required
voltage of
12 to 40 Vdc for non-hazardous (ordinary location) applications
.
Installation in a hazardous area (classified location)
The 3107 and the 3108 are suitable for Intrinsically Safe (IS) applications.
has the safety approval information and control drawings.
When the transmitters are used with a Rosemount 3490 Series Control Unit, no additional
safety barriers are required as the control unit output is Intrinsically Safe.
If powering the transmitter from any other source, ensure a suitable Intrinsically Safe (IS) barrier
is fitted in the non-hazardous 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 (see
Appendix B: Product Certifications
for the parameter values). In addition, the sum of the capacitance and the inductance of the
transmitter and any extra cable fitted must not exceed the maximum specified for the barrier.
Suitable barriers include the MTL products 706, 706S, 787, and 787S.
Summary of Contents for 3107
Page 2: ......
Page 4: ...Reference Manual 00809 0200 4840 Rev BA Title Page December 2014 ...
Page 16: ...6 Reference Manual 00809 0200 4840 Rev BA Section 2 Transmitter Overview December 2014 ...
Page 145: ......
Page 146: ......
Page 147: ......