22
RFT9709 Transmitter Instruction Manual
Wiring
continued
Slug-flow inhibit
The RFT9709 senses density outside user-selected limits. The output
holds at the last measured flow rate before a slug-flow condition
occurred, for a programmed time of 0-60 seconds, then defaults to 0 Hz.
Damping
A wide range of filter constants is available for damping on flow.
Control output
The control output can indicate flow direction, RFT9709 zeroing in
progress, fault alarm, event 1, or event 2.
Figure 2-14.
Control output terminals
Output performance
• When configured to indicate flow direction, the output is high (+23 V)
when indicating forward flow, and low (0 V) when indicating reverse
flow.
• When configured to indicate RFT9709 zeroing in progress, the output
is low (0 V) when zeroing is in progress and high (+23 V) at all other
times.
• When configured to indicate faults, the output is low (0 V) when a fault
condition exists and high (+23 V) during normal operation.
• When configured to indicate event 1 or event 2, the output switches ON
(0 V) or OFF (+23 V) when the flow rate, flow total, density,
temperature, pressure, or viscosity of the process fluid achieves a
programmed setpoint.
• RFT9709 output is nominal 0 or +23 V, unloaded.
• Output impedance is 3.3 kohm.
• If necessary, the control output can be configured for open collector
mode. For instructions, see Appendix D, page 53. When used in the
open collector mode, the output circuit is rated to 30 VDC, with 0.1
ampere maximum sinking capability.
RFT9709 terminals
for output wiring
1
1
12 1
3
14 1
5
16
17
18
19
20
21 22
F GND (return)
CNTRL (signal line)
Terminal 18 is a common return for the frequency/pulse
output, the control output, and the external zero input.
09wire.fm Page 22 Monday, March 1, 1999 4:31 PM
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