Understanding the Spill Alarm Reset

The TD80 and TD100 Transmitters with Dual-rod probes have different levels where the Spill alarm is reset. The TD80 transmitter is more susceptible to having the Spill alarm stuck in an alarming state than the newer TD100 transmitter. The stuck Spill alarm may be due to overfilling the compartment or deliberately filling it to the Spill alarm level.

On transmitters equipped with a dual-rod probe, the Spill alarm is reset by a specific set of conditions while unloading.

For TD80 transmitters:

1. The TD80 system must be powered on and operating normally. The Finch display initially shows a volume or 2LO and the Spill alarm annunciation.
2. While the system is turned on, unload the compartment to a point 2” or greater below the High-High alarm level.
3. If the system is turned off during unloading, the Spill alarm will not be reset.

For TD100 transmitters:

1. The TD100 system must be turned on and operating normally. The Finch display initially shows a volume or 2LO and the Spill alarm annunciation.
2. While the system is turned on, unload the compartment to a point 1” or greater below the Spill alarm level.
3. If the system is turned off during unloading, the Spill alarm will not be reset.

What causes the Spill alarm to be stuck in an alarming state?

1. The compartment may be loaded to or above the Spill alarm level. The only resolution is to unload the compartment while the system is turned on.
2. The compartment was loaded to or above the High-High alarm level and not to the Spill alarm level. Sloshing while driving with the system turned on may trigger the Spill alarm. If the liquid level does not drop below the Spill alarm reset level, the Spill alarm will be stuck in the alarming state.

For TD80 transmitters, the liquid level must drop at least 2.5” below the Spill alarm level to reset. 2” below the High-High alarm level is where the Spill alarm resets. The High-High alarm level is programmable. It may be as close as 0.5” below the Spill alarm level and as low as the customer determines the maximum loaded capacity of the compartment. The liquid level must drop at least 2.5” or many more inches from the Spill alarm level. If the loaded liquid level is at or slightly higher than the High-High alarm level, the Spill alarm will be stuck in an alarming state due to sloshing while loading or driving.

For TD100 transmitters, the liquid level must drop at least 1” below the Spill alarm level to reset. The High-High alarm level is programmable. It may be as close as 2” below the Spill alarm level. If the loaded liquid level is at or slightly higher than the High-High alarm level, the Spill alarm will always reset after sloshing while driving. The condition for a stuck Spill alarm is loading to within 1” of the Spill alarm and sloshing while loading or driving.

The Spill Alarm Specifications

Band-Clear (For Dual-Rod or Coaxial Probes)

• TD100: liquid level must be detected at least 1” below and within 16.5” of the Spill alarm level.
• TD80: liquid level must be detected at least 2” below the High-High alarm level and within 16.5” of the Spill alarm level.

Auto-Clear (For Coaxial Probes ONLY)

• TD100: the liquid must be detected at least 1” below the Spill alarm level.
• TD80: the liquid must be detected at least 2” below the High-High alarm level.