Signal Type: Frequency; Signal Type: Digital (S 3 L) - Signet 9900 Operating Instructions Manual

Signal Type: Frequency

Signet fl ow sensors 515/8510, 525, 2000, 2100, 2507, 2536/8512 and 2540 provide a
frequency output. (Flow sensors 2551 and 2552 can be confi gured with either Digital (S
or Frequency outputs, see page 13.)
The maximum allowable cable length for sensors with frequency output is dependent upon
the output signal strength of the sensors themselves, and the degree to which the signals
are susceptible to EMI or "noise." This is largely a function of whether the sensors are
self-powered (515/8510 and 525), or powered by an external source.
● The input terminals on the 9900 carry frequency data signals from the sensor.
● Do not route sensor or output cables in conduit containing AC power wiring.
Electrical noise may interfere with sensor signal.
● Routing cable in grounded metal conduit will help prevent electrical noise and
mechanical damage.
● Seal cable entry points to prevent moisture damage.
● Only one wire should be inserted into a terminal. Splice double wires outside the terminal.
● In case of noise interference, ground the sensor SHIELD wire to a local earth ground
at a point near the sensor.
● Consult the sensor manual for additional wiring information.
Signal Type: Digital (S
● The input terminals on the 9900 carry Digital (S
● Do not route sensor or output cables in conduit containing AC power wiring.
Electrical noise may interfere with sensor signal.
● Routing cable in grounded metal conduit will help prevent electrical noise and
mechanical damage.
● Seal cable entry points to prevent moisture damage.
● Only one wire should be inserted into a terminal. Splice double wires outside the terminal.
● The TOTAL cable length from I/O devices to the transmitter must not exceed 305 m (1000 ft).
● In case of noise interference, ground the sensor SHIELD wire to a local earth ground
at a point near the sensor.
● Consult the sensor manual for additional wiring information.
● The maximum cable length of the Digital (S
of sensors connected and the size of the conductors in the cable. For best results,
determine the maximum cable length for the system before routing cables.
● There are several methods that can help route the digital cables and remain within the
distance limitations.
L)
3
3 L) serial data from the sensor.
3 L) bus varies depending on the types
Flow sensor
3 L)
models with
Frequency
Output
(200 ft)
515/8510
525
2000
2100
2507
2536/8512
2537
2540
2551
2552
In case of noise
interference, connect
the cable shield to
earth ground.
Maximum total cable length
of the Digital (S
The quality of the cable
used in the bus determines
the maximum length of all
branches combined.
The maximum cable length
may not exceed
305 m (1000 ft),
regardless of current
requirements.
9900 Transmitter
Maximum
Cable Length
60 m 305 m
(1000 ft)
X
X
X
X
X
X
X
X
X
X
L) Bus:
3
9