42
RFT9709 Transmitter Instruction Manual
RFT9709 Specifications
continued
Low-flow cutoff
Flow values below the user-defined low-flow cutoff cause digital, mA,
and frequency outputs to default to zero flow levels.
Slug-flow inhibit
RFT9709 senses density outside user-selected limits. Flow output holds
at last measured value prior to slug condition, for a programmed time of
1-60 seconds, before defaulting to the level that represents zero flow.
Damping
Wide range of programmed filter time constants for damping on flow,
density, and temperature. Additional damping may be applied to mA
outputs.
Fault indication
Faults can be indicated by user-selected downscale (0-2 mA, 0 Hz) or
upscale (22-24 mA, 15-19 kHz) output levels. The control output can
also be configured to indicate a fault condition at 0 V.
Output testing
Current source
RFT9709 can produce a user-specified current between 2 and 22 mA on
a 4-20 mA output.
Frequency source
RFT9709 can produce a user-specified frequency between 0.1 and
15,000 Hz.
Power supply options
11 to 30 VDC, 7 watts typical, 14 watts maximum, fused with IEC 127-3
1.6A/125V, time-lag, subminiature. At startup, transmitter power source
must provide a minimum of 1.6 ampere of short-term current at a
minimum of 12 volts at the RFT9709 power input terminals.
Environmental limits
Ambient temperature limits
Operating:
–40 to 122°F (–40 to 50°C)
Storage:
–40 to 176°F (–40 to 80°C)
Humidity limits
Meets SAMA PMC 31.1-1980
Vibration limits
Meets SAMA PMC 31.1-1980, Condition 2
Environmental effects
Ambient temperature effect on transmitter
On mA outputs: ±0.005% of span/°C
On mA input:
±0.01% of span/°C
09specs.fm Page 42 Tuesday, March 2, 1999 9:30 AM
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