Instruction manual
78
RFT9739 Field-Mount Transmitter Instruction Manual
RFT9739 Specifications
continued
Functional specifications
Output Signals Analog
Two independently configured analog outputs, designated as primary
and secondary, can represent mass or volumetric flow rate, density,
temperature, event 1 or event 2. These outputs cannot be changed from
active to passive. With a pressure transmitter, outputs can also provide
indication for pressure. Internally powered, can be selected as 4-20 mA
or 0-20 mA current outputs. Galvanically isolated to ±50 VDC, 1000 ohm
load limit. Out-of-range capability: 0-22 mA on 0-20 mA output;
3.8-20.5 mA on 4-20 mA output.
Milliamp (mA) output rangeability
Flow
Maximum span determined by sensor specifications.
Range limit determined by sensor maximum rate.
Minimum recommended span (% of nominal flow range):
ELITE sensors 2.5%
F-Series sensors 10%
D, DT, and DL sensors 10%
D300 and D600 sensors 5%
High-pressure (DH) sensors 20% typical
Density
Range limit 0 to 5 g/cc (0 to 5000 kg/m³)
Minimum span 0.05 g/cc (50 kg/m³)
Temperature
Range limit –400 to 842°F (–240 to 450°C)
Minimum span 36°F (20°C)
Frequency
One frequency/pulse output can be configured to indicate mass flow rate,
volumetric flow rate, mass total (inventory), or volume total (inventory),
independent of analog outputs. Internally powered, 0-15 V square wave,
unloaded; 2.2 kohm impedance at 15 V, galvanically isolated to
±50 VDC
.
In open collector configuration: sinking capability, 0.1 amps in "on"
condition (0 volt level), 30 VDC compliance in "off" condition. Signal can
be scaled up to 10,000 Hz. Out-of-range capability to 15,000 Hz.
Programmable pulse width for low frequencies.
Control
One control output can represent flow direction, fault alarm, zero in
progress, event 1 or event 2. Internally powered, digital level, 0 or 15 V,
2.2 kohm pull-up, galvanically isolated to ±50 VDC. In open collector
configuration: sinking capability, 0.1 amps in "on" condition (0 volt level),
30 VDC compliance in "off" condition.