16
GF 9950-10 Six Channel Transmitter
GF
fl
ow sensors 515/8510, 525, 2000, 2100, 2507, 2536/8512 and 2540 provide a
frequency output. (Flow sensors 2537, 2551 and 2552 can be con
fi
gured with either
Digital (S
3
L) or Frequency outputs).
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 (-1).
• The input terminals on the 9950 carry frequency data signals from the sensor.
• The 9950 has a selection for 515/525 under the input menu. Select "Yes" for optimum
signal performance.
• 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.
Flow sensor
models with
Frequency
Output
Maximum
Cable Length
60 m
(200 ft)
305 m
(1000 ft)
515/8510
X
525
X
2000
X
2100
X
2507
X
2536/8512
X
2537
X
2540
X
2551
X
2552
X
Signal Type: Frequency
• The input terminals on the 9950 carry Digital (S
3
L) serial data 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.
• 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
3
L) bus varies depending on the types
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.
In case of noise
interference, connect
the cable shield to earth
ground.
Maximum total cable length
of the Digital (S
3
L) Bus:
The quality of the cable used
in the bus determines the
maximum length.
The maximum cable length
may not exceed
305 m (1000 ft),
regardless of current
requirements.
Signal Type: Digital (S
3
L)
Mfr. Part No.
Code
Description
3-9950.394-1
159 001 894
Single Channel Direct Conductivity Resistivity Module
3-9950.394-2
159 001 847
Dual Channel Conductivity/Resistivty Module
3-9950.395-M
159 001 905
Modbus Module
3-9950.398-2
159 001 848
Dual Channel 4 to 20 mA Current Loop Output Module
Conductivity, Loop and Modbus Modules
Direct Conductivity Resistivity Module
Compatible with all GF Conductivity Electrodes. Maximum Conductivity cable length is 30
m (100 ft). Up to two modules can be installed in a 9950 Transmitter.For longer distances
use the 3-2850 Conductivity Sensor Electronics.
Dual Channel 4 to 20 mA Module
Two additional 4 to 20 mA passive current loop outputs in a single module, allows up to
six current loop modules in the 9950 Transmitter.
Modbus Module
The Modbus Module connects the 9950 to serial RS485 Modbus automation networks.
