0(4) - 20mA - RACO-International, LP
ELECTRONIC POSITION TRANSMITTER DMU 2
Application
0(4) - 20mA
Angular Position
Sensor
Dependable
Robust
Easy to use
Accurate
The RACO angular position transducer,
DMU 2, converts the angle of a rotating
shaft into a proportional, load
independent, direct current signal of 0
(4) to 20 mA. Angular position
transducers are particularly useful as
feedback devices to position actuators in
a closed loop system for valve, gate,
louver and screen applications, or in
general, as angular positioning
indicators. For measurements of angular
positions, exceeding 345°, gear sets are
available from RACO’s modular
program to facilitate these applications.
adjustment of the 4 mA starting angular
position is easily achieved by rotating
the supplied mechanical clutch. The slip
clutch mechanism connects the DMU 2
potentiometer shaft to the rotating
equipment shaft which allows for
rotational
and
some
angular
misalignment.
The mounting of the DMU2 is
comparable to the mounting of a
standard potentiometer and, therefore,
makes it very easy to upgrade from a 0
to 10V angular position voltage signal
to the more robust and noise immune 420 mA angular position signal.
Principle of Operation
Design
The RACO angular position transducer,
DMU 2, consists of a precision
potentiometer and an electronic circuit
board encapsulated in a potted housing
for temperature uniformity and
environmental protection. On the back
side of the angular position transducer
two multi turn trim potentiometers and a
selector switch providing easy access
for angular range, offset and gain
adjustment. The position of the selector
switch defines the current output signal
as 0(4) to 20 mA or 20 to (4)0 mA. The
As the potentiometer rotates, an angular
proportional voltage will be generated.
This voltage will be converted via
control amplifiers into a load
independent proportional self regulated
current signal. Variations in the supply
voltage are automatically compensated
by the control amplifiers via feedback
control loops of the output current
signal. The output current is limited to a
maximum value of 24mA.
Specifications:
Power Supply:
Potentiometer:
Current dissipation:
Output signal:
Linearity:
Temperature range:
Load:
15 to 30 V DC, filtered
1 kΩ
30 mA max.
0(4) to 20 mA
<8%
-20°C to +70°C
1200 ohm max, 30V
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