
Reference Manual
00809-0100-4841, Rev. AA
May 2007
Rosemount 3490 Series
4-2
SWITCHING ON
Switching on the
3491/3493
The Rosemount 3490 Series Control Unit takes the input from a HART
transmitter or 4-20mA transmitter.
3491 and 3493 support level, content and flow measurements. 3493 software
has data logging support.
After completing the installation of both 3490 Series Control Unit and
transmitter, apply power to the 3490 Series Control Unit.
Figure 4-1. 3490 Series Control
Unit with 1 transmitter
The factory default is for the 3490 Series Control Unit to automatically locate a
HART compatible transmitter, which may have any polling address in the
range 0 to 15.
NOTE:
If a transmitter is not connected, the Primary Display will appear after a few
seconds, but showing a PV of zero.
If a 4-20mA transmitter is connected, the 3490 Series Control Unit will poll up
to address 15, and then report that no transmitter was found. The Primary
Display will appear after a few seconds, but showing a PV of zero. It is then
necessary to configure the 3490 Series Control Unit for a 4-20mA input
instead of a digital input. See Section “Transmitter inputs to the 3490“ on
page 4-13 for details of this procedure.
A HART transmitter will normally be located within 30 - 40 seconds. When
found, it will automatically be designated Ch1 (Transmitter #1) and
automatically assigned to 3490’s Channel 1.
However, unless the poll address was zero (factory default), prompts then
appear for changing the poll address and the tag name; this is optional and
pressing the red (ENTER) button will continue to start-up process. During this
time, the 3490 Series Control Unit will read parameters from a HART
transmitter and make them available within the hierarchical menu system.
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