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FTB700-T
Blind Analog Transmitter Instructions
The Omega FTB700-T is a blind (non-indicating) 4-20 mA transmitter. 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 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 provided with mounting
feet or remote mounting.
The FTB700-T 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.
Specifications
Power
Temperature
Input
Input Averaging
Response Time
Frequency
Minimum
Maximum
Setting
Output
*Specifications subject to change. Please consult our web site for current data
(omega.com).
24 - 36 Vdc
32˚ to 130˚ F (0˚ to 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 (@20mA)
999.9 Hz
4 Rotary DIP switches
Proportional 4-20 mA
36
Operating
34
32
Loop
Power
30
(Vdc)
28
26
24
700
Page 7
FTB700-T INSTRUCTIONS
Load vs. Supply Voltage
Region
900
1100
1300
Load Resistance (Ohms)
1500
omega.com
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