TD80™ Level Gauging and Overfill Prevention System Product Manual
Page 122 TD80 Operation/ Rev. 2, August 4, 2015
5.5.2 Fill / Fall Alarm
The Fill/Fall alarm level is an operator set value for use in filling or draining the tank to a
predetermined level. This alarm is associated with the Fill Alarm Relay. The Fill Alarm
Relay is intended for use with a horn or visible indicator. When the Fill/Fall level is
reached the alarm is triggered and the relay is activated. The Fill/Fall Alarm continues
until it is acknowledged. To acknowledge the alarm, momentarily press one of the buttons
on the front of the Finch Display or the External Alarm Acknowledge button (if installed).
5.5.3 High High Alarm
The High High alarm (HH) level is set when programming the TD80 transmitter. This level
is set to a volume of a minimum ½” below the Spill Level. This alarm is associated with
the HH alarm relay. When the HH alarm is triggered, the HH alarm relay is activated, the
display alternately flashes the current level and “HH”.
To acknowledge this alarm the operator must either press the External Alarm
Acknowledge button (if installed) or press the buttons on the front panel in the following
order: up - up - down - up.
If the Fill/Fall alarm and the High High alarm are triggered at the same time, they can
both be acknowledged at the same time by pressing the External Alarm Acknowledge
button or the front panel button sequence.
5.5.4 Fail Alarm
The Fail alarm reports when a system error has occurred. This alarm is associated with
the Spill/Fail alarm relay. This alarm will activate the relay when an error message is
received from the TD80 transmitter or the Finch Display does not receive any
communications for over 6 seconds.
This alarm is self resetting, when the cause of the alarm is removed, the alarm resets. No
acknowledgment is required for this alarm. For example if the unit does not receive any
communications for 6 seconds the alarm will be set, but if communication is received 1
second later, the alarm will reset.
5.5.5 Disabling the 2 LO Message
The Finch Display can be set to show the level within the bottom dead band by inserting
the 2 LO Disable jumper during installation. This will prevent the 2 LO message from
appearing on the display. When installed, this jumper will enable the Finch to display the
tank level all the way to the top of the shorting block (2 ½” minimum from the bottom of
the tank).
Note: It is not recommended that the unit be operated in this state. The readings within
the bottom dead band are inaccurate and unreliable.
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