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The Green PERMIT LED will light when the tester detects a good signal from the sensor.
The Red DIAGNOSTIC LED will light when a good signal from the green diagnostic wire
from a 5 wire sensor.
The connection in the upper center is for connection of the test lead sets. The tester comes with
four test lead sets that provide testing of sensors or sockets on any onboard monitor.
Sonalert horn located in the center of the tester provides a load audible signal when a good
signal is detected. When the two or three wire test lead set is used a good signal will report a
continuous audible beep. The five wire test lead set will provide a intermittent "beeping"
signal which corresponds with the echo of digital pulses sent to and received from a good
sensor.
USING THE FT520 OPTIC SYSTEM TESTER:
Look below for the type of test you wish to perform. Follow the directions as written.
TESTING A FIVE WIRE OPTIC SENSOR:
Follow this test procedure if you suspect a sensor is defective.
A) Connect the five-wire test lead set to the connector on the tester. Connect each clip lead to
a matching color wire from the sensor.
B) Turn on the tester.
C) The red LED should be lit (it will sometimes blink with green light), the green LED should
be lit when connected to a green wire, and the Sonalert should sound with an intermittent
beeping signal. This is a GOOD sensor.
D) IF the green LED is not lit and the Sonalert does not beep then the sensor is BAD.
E) IF the green LED is lit and the Sonalert is beeping but the red LED is out then the sensors
diagnostic circuit has failed. If this sensor is used on an onboard monitor, the monitor will
provide a permissive signal to the load rack but the sensor will cause a red diagnostic LED
to light on the monitor as well. This is a BAD sensor.
TESTING AN ONBOARD MONITOR OPTIC OUTPUT:
Follow this procedure if the monitor has a permissive LED lit but no permit is given at an
optic load rack.
A) Remove the optic socket faceplate so you have access to the wire connection on the rear of
the socket faceplate.
OPTION: Use the FT521, FT522 or FT523 API compatible test plug to make a quick
connection to the socket front. This test plug is similar to the plug used at the load rack.
If the monitor output to the socket is good the Sonalert will beep and the sensor ok light
Rev: January 2010
will flash.
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