FTB700-T INSTRUCTIONS
Page 7
omega.com
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.
Loop
Power
(Vdc)
Load Resistance (Ohms)
700
900
1100
1300
Load vs. Supply Voltage
Operating
Region
36
34
32
30
28
26
24
1500
*Specifications subject to change. Please consult our web site for current data
(omega.com).
Power
24 - 36 Vdc
Temperature
32˚ to 130˚ F (0˚ to 55˚ C )
Input
Open collector solid state sensor
Input Averaging
2 - 16 seconds (switch selectable)
Response Time
2 - 60 seconds; 90% of full scale
(dependent on input averaging)
Frequency
Minimum
10 Hz (@20mA)
Maximum
999.9 Hz
Setting
4 Rotary DIP switches
Output
Proportional 4-20 mA
Specifications
