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D) Connect white boot to pin 10. (white lead)
E) Touch black boot clip to pin 3, you should get a continuous tone. This indicates a good
sensor and wire connection to the sensor. If no tone is heard open sensor cap
compartment one. Test the sensor directly with the FT520 using the same test lead set.
If the sensor give a continuous tone the sensor is good. Look for a bad wire connection
between the sensor and socket.
F) Now touch the black boot clip to pin 4. Repeat the same step E procedure.
G) Repeat the same test on pins 5, 6, 7, and 8. In Canada follow the same test for pins 1
and 2.
H) Note on tanks with fewer than 8 compartments an electronic signal dummy is used. If
a FloTech or Civacon dummy, follow the same procedure as in E to test the dummy. If
a Scully dummy, it can only be tested on the blue wire.
TESTING A THERMISTOR DUMMY:
This procedure will test 6 wire FloTech, Scully, or Civacon electronic thermistor dummy using
the FloTech FT520 tester.
A) Plug the thermistor output test lead set into the FT520 Optic System Tester. This is the
test lead set with three clip lead (RED, ORANGE, BLACK) and a RED probe.
B) Clip the ORANGE clip lead to the BLUE dummy wire. Clip the BLACK clip lead to
the WHITE dummy wire. And clip the RED clip lead to the RED dummy wire.
C) Turn on the tester. The YELLOW power light should be lit.
D) Touch the RED probe to the BLUE dummy wire and a continuous tone should be heard
from the FT520 Tester.
E) Touch the RED probe to the RED dummy wire and a continuous tone should be heard
from the FT520 Tester.
F) Move the RED clip lead to the BLACK dummy wire. Touch the RED probe to the
BLACK wire, a continuous tone should be heard from the FT520 tester.
G) Move the RED clip lead to the GREEN dummy wire. Touch the RED probe to the
GREEN wire, a continuous tone should be heard from the FT520 tester.
H) Move the RED clip lead to the YELLOW wire. Touch the RED probe to the Yellow
wire, a continuous tone should be heard from the FT520 tester.
NOTE: On Scully electronic Thermistor dummies the ORANGE clip lead must always
be connected to the BLUE dummy wire. This is how the dummy receives power to
operate the internal electronics. Use the ORANGE clip and RED test probe to test each
wire.
Rev: January 2010
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