Seametrics AO55 Specifications
FEATURES
• Pulse-to-analog converter
• Current loop powered
• Smooth output signal
• Easy set-up
• Durable
APPLICATIONS
• Telemetry/SCADA
• Distributed control systems
• Programmable controllers
• Chart recording
• Data logging
AO55
Blind Analog Transmitter
GENERAL INFORMATION
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 conver ts 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 microcontroller automatically scales all other values accordingly. An additional
benefit of the microcontroller 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 clamshell 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 distor tion 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 telemetr y (or
SCADA), distributed control systems, programmable controllers, data logging, and chart recording.
FEATURES
Loop
Power
(Vdc)
Load Resistance (Ohms)
700 900 1100 1300
Load vs. Supply Voltage
Ope r a t i n g
Reg i o n
36
34
32
30
28
26
24
1500
AO55
Blind Analog Transmitter
Fusion coated cast aluminum housing
Easy to use rotary switches for frequency setting
Potted for moisture protection
Loop power indicator light
4-20 mA adjustment switches
Averaging time switches
AO55 Wall Mount Shown
(meter mount also available)
SPECIFICATIONS*
Power
Temperature
Input
Input Averaging
Response Time
Frequency Minimum
Maximum
Setting
Output
*Specifications subject to change. Please consult our website for the most current data (www.seametrics.com).
24 - 36 Vdc
32˚ - 130˚ F (0˚ - 55˚ C)
Open-collector solid state sensor
2 - 16 seconds (switch selectable)
2-60 seconds; 90% of full scale (dependent on input averaging)
10 Hz (@20 mA)
999.9 Hz
4 Rotary DIP switches
Proportional 4-20 mA
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