RFT9709 Transmitter Instruction Manual
23
Wiring
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External zero switch wiring
The RFT9709 can be configured to allow flowmeter zeroing from an
external switch.
• The switch must be a momentary-type contact, normally open, and
must carry 1 mA of current in the closed position. The open circuit
voltage is 23 VDC.
• The flowmeter zeroing procedure is described in Section 3.2, page 27.
Figure 2-15.
Remote-zero switch wiring
WARNING
Failure to comply with requirements for intrinsic
safety in a hazardous area could result in an
explosion.
External zero switch wiring is not intrinsically safe.
Keep external zero switch wiring separated from
power-supply wiring, intrinsically safe sensor wiring, and
any other intrinsically safe wiring.
RFT9709 terminals
for output wiring
1
1
12 1
3
14 1
5
16
17
18
19
20
21 22
F GND (return)
ZERO+ (signal line)
Remote
switch
Terminal 18 is a common return for the frequency/pulse
output, the control output, and the external zero input.
09wire.fm Page 23 Monday, March 1, 1999 4:31 PM
Summary of Contents for Fisher-Rosemount RFT9709
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