Reference Manual
00809-0200-4840, Rev BA
Section 2: Transmitter Overview
December 2014
3
Section 2
Transmitter Overview
Introduction to the transmitters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 3
Theory of operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 4
Components of the transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 4
System architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 5
2.1
Introduction to the transmitters
The Rosemount 3107 and Rosemount 3108 are sealed 4–20 mA loop-powered liquid level
transmitters, and are designed for use in waste water and effluent treatment plant applications.
The 3108 is MCERTS certified for open flow channel applications.
These rugged UPVC transmitters are certified Intrinsically Safe for use in Zone 0 areas, and
factory fitted with up to 164 ft. (50 m) of two-core cable for simple low cost installation in
sumps, wet-wells and over open channel flow structures.
The transmitters can be connected directly to a plant control system, or used with a Rosemount
3490 Series Control Unit for programmable control functionality.
Note
The Rosemount 3490 Series Control Unit software must be version 3.40 or later.
Figure 2-1. Typical application using a Rosemount 3108 flow transmitter
A. Rosemount 3108 Flow Transmitter
E. Pump
B. Rosemount 3490 Series Control Unit
F. Transmitter Bottom Reference
C. 4–20 mA signal output
G. 4–20 mA and HART signal input
D. Relay
B
E
E
20mA
4mA
F
D
D
C
A
G
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