Page 36 709-BTP3 Manual
connected back to the display ground or the breaker panel
ground.
14. All that remains now is calibration and testing. The tank
senders will self calibrate to whatever length they are cut, so
they will always read from 0% to 100%. The display needs
to be set to a single or double sender system for each tank.
See the chapter entitled “DISPLAY CALIBRATION” and the
section “To program the number of senders for each tank”
for details. Make sure you do it for each tank.
15. For the initial test, have the tank at least ¼ full of water or
sewage, and verify that the percent level reading looks correct
(see the chapter entitled “OPERATING INSTRUCTIONS”
and the section “To read a water or sewer tank level” for
details). Check to see that the signal power is at least 20%
(see the chapter entitled “TROUBLESHOOTING GUIDE”
and the section “To review the sender diagnostics” for
details). If the signal power is too low, make sure that the
sender(s) is well stuck to the side of the tank and that the
tank is reasonably clean inside, as a large buildup will reduce
signal strength. The gauge will work with maximum signal
strengths as low as 20%, but it is good to have at least 50% to
60% at installation so that there is some margin available for
buildup in the tank. Note that the system “learns” about the
characteristics of the tank with use, so the readings may be
inaccurate when the tank is empty or almost empty when the
system is rst tested. Once the tank has been lled at least
¼ full the system will be properly “taught” and should read
correctly after that.
16. Calibrate the LPG by lling the tank and following the
instructions in Chapter 4 entitled “DISPLAY CALIBRATION”
and the section ”To calibrate the LPG sender”.
17. If equipped, connect the pump switch as required.
18. WARNING: The pump switch is rated for a maximum
of 7.5 amps. The use of a relay is required if more than 7.5
amps is needed. A 7.5 amp (max) fuse must be installed
in the series with the 12V power circuit to the switch!
19. Verify that the battery voltage reads correctly. If it appears
low, make sure you have good wiring for the 12 volt power
and the ground.
20. The common alarm output provides a connection to ground
when the alarm is active. The maximum current that can be
put through the alarm output is 100mA, be sure to use a relay
if more current is required. Program and test the alarm output
to ensure that it functions as desired.
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