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E
Support for HART
®
Transmitters
E.1
Overview
The Rosemount
™
3490 Series Control Unit (“control unit”) is able to accept digital data
from any HART 5/6/7 compatible transmitter. However, the control unit is not Device
Descriptor (DD) based and only fully supports transmitters that have been factory
programmed into the on-board library.
E.2
Fully supported HART transmitters
Fully supported HART transmitters, where all parameters of the transmitter are accessible
for reading and writing by the control unit:
•
Rosemount 3102 Level Transmitter (HART 5)
•
Rosemount 3105 Level Transmitter (HART 5)
•
Rosemount 3107 Level Transmitter (HART 5)
•
Rosemount 3108 Flow Transmitter (HART 5)
Note
If a Rosemount 3100 Series Transmitter is connected, refer to the Rosemount
3101/3102/3105
or Rosemount 3107/3108
for full
information about programming the transmitter parameters.
E.3
Generic support for HART transmitters
E.3.1
Compatibility between transmitter and control unit
The control unit is designed to provide an intrinsically safe power supply to power a I.S-
approved transmitter that is field-mounted in a hazardous area. The control unit provides
a nominal 24 Vdc supply.
Communication with the transmitter is HART, provided the transmitter current output is
configured in a passive mode to enable the control unit to power the current loop.
The addition of components (both resistive and semiconductor) as part of the I.S
certification and HART communication result in the terminal voltage varying with load
current. Increasing the load current in the loop results in a decrease in the terminal output
voltage of the control unit. Most HART transmitters require a minimum input voltage to
work correctly, and for HART communication to function. For example, a Rosemount 3105
Ultrasonic Level Transmitter can operate over a voltage range of 12 to 40 Vdc (12 to 30
Vdc for intrinsically safe installations). Consideration must be given to the loop resistance
of the cable connecting the transmitter to the controller to ensure sufficient input voltage
is available at the transmitter.
Reference Manual
Support for HART
®
Transmitters
00809-0100-4841
January 2021
Emerson.com/Rosemount
185
Summary of Contents for Rosemount 3490 Series
Page 4: ...4 ...
Page 8: ...Introduction Reference Manual January 2021 00809 0100 4841 8 Emerson com Rosemount ...
Page 16: ...Control unit overview Reference Manual January 2021 00809 0100 4841 16 Emerson com Rosemount ...
Page 36: ...Installation Reference Manual January 2021 00809 0100 4841 36 Emerson com Rosemount ...
Page 134: ...Getting started Reference Manual January 2021 00809 0100 4841 134 Emerson com Rosemount ...
Page 184: ...Additional features Reference Manual January 2021 00809 0100 4841 184 Emerson com Rosemount ...
Page 189: ...Reference Manual 00809 0100 4841 January 2021 Emerson com Rosemount 189 ...