The Seametrics
AO55 is a blind (non-indicating) 4-20 mA, transmitter, designed for use
with almost all Seametrics flow sensors. It accepts a pulse frequency
input from the flow sensor, and converts this input into a continuous
analog output signal.
Power for the transmitter is taken from the current
loop itself, so only two wires are required. The digital design makes it
possible to span the unit in the field without tools. The frequency at
which 20 mA is desired is entered on a set of rotary switches, and an
internal micro controller automatically scales all other values
accordingly. An additional benefit of the micro controller is its ability
to average inputs, for smoothing of the output signal. The degree of
averaging can be selected in the field, from 2 to 16 seconds.
For maximum
environmental protection, the electronic components are encased in a
special semi-flexible urethane potting material. The housing is cast
from aluminum and fuse-coated. The clamp shell housing is connected
directly to the flow sensor or, in the wall mount version, provided with
mounting feet.
The AO55 will operate on a relatively wide range
of current loop voltages, 24 to 36 Vdc. Lower voltages limit the load
that can be applied to the loop without distortion of the signal. (See
Load/Supply chart if there is a question regarding voltage vs.load.) A
built-in power regulator supplies the appropriate power to the flow
sensor.Typical applications for this transmitter are telemetry (or
SCADA), distributed control systems, programmable controllers, data
logging, and chart recording.
APPLICATIONS
•Telemetry/SCADA
•Distributed control systems
•Programmable controllers
•Chart recording
•Data logging
FEATURES
•Pulse-to-analog converter
•Current loop powered
•Smooth output signal
•Easy set-up
•Durable
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