FloTech FT520 Manuel D'instructions page 5

B) Check for permit LED. The permit LED is green and should be lit. If the green permit
LED is not lit continue with testing procedure.
C) Connect two-wire test lead set to FT520 tester and turn on the power switch.
D) Connect the black lead to the onboard monitor housing. And touch the probe to the yellow
terminal where the sensors are wired to the monitor. If a tone is sounded move the probe
to the orange terminal. Go to step E. If no tone is sounded remove the yellow sensor wire
from the terminal block. Touch the red probe to the yellow terminal again. If no tone is
sounded replace the monitor. If a tone is sounded that means something in the sensor
string is shorting the yellow pulse to ground. Look for a short to ground in the sensor
wiring somewhere on the trailer or sensor housings.
E) Test the orange terminal on the onboard monitor. If a tone is sounded but the green permit
light is out replace the onboard monitor. If no tone is sounded then the problem is
somewhere in the sensor string.
F) Remove the sensor caps and, starting with compartment one, test for a tone on the yellow
wire into each sensor and the orange out of each sensor. The problem can be found where
the tone is not sounded. If a tone is sounded on the yellow wire of a sensor but not the
orange the probe is defective. Replace the sensor.
G) If a tone is sounded on the orange wire of a sensor but not sounded on the yellow of the
next sensor a wiring problem exist between the two sensors. Replace sensor cable between
sensors.
H) Retest system. Look for permit light on onboard monitor.
I) Contact your local FloTech / Bayco Distributor for quality replacement parts.
TESTING A TWO WIRE OPTIC SENSOR (SCULLY OR CIVACON TOP OR BOTTOM
SENSORS:
A) Connect the two-wire test lead with white and black boots.
B) For a SCULLY (white & black wire) sensor, connect the white boot to the white wire and
the black boot to the black wire. For a CIVACON (red & black wire) two-wire sensor
connect the red lead (Black boot) to the red sensor wire and the black lead (White boot) to
the black sensor wire.
C) Turn on the tester. The FT520 tester should sound a continuous tone.
D) If the sensor is defective the sensor will not sound the Sonalert or light the green LED.
E) Contact your local FloTech / Bayco Distributor for quality replacement parts
TESTING TWO WIRE FLOTECH PLUG AND PLAY SENSORS:
A) Connect the two-wire test lead with plug and play connector.
B) Plug the plug and play probe into the test lead set.
C) Turn on the tester. The FT520 tester should sound a continuous tone.
D) If the sensor is defective the sensor will not sound the Sonalert or light the green LED.
E) Contact your local FloTech / Bayco Distributor for quality replacement parts
TESTING TWO WIRE OPTIC SENSORS WIRED STRAIGHT TO THERMISTOR
SOCKET:
A) Connect the two wire test lead with white and black boots.
B) Turn on tester.
C) Remove socket face plate to connect test lead to back of socket.
Rev: January 2010 Page 5 of 7