American Magnetics 286 Multi-Sensor Liquid Level Instrument (CE-Marked) - Manual (Page 63)

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Operation
Menu Reference
4.3.8.3 Empty Detection
The empty detection menu allows the user to specify whether
simple timeouts or the remote contact senses will be used to
determine the availability of liquid from each storage vessel.
If the Timeout option is selected, the Model 286 will use the
changeover time as the maximum amount of time allowed for an
auto-fill cycle to complete. If the auto-fill cycle does not complete
within the changeover time, the fill expires and the respective front
panel FILL LED blinks, and an attempt is made to complete the
auto-fill cycle from the other storage vessel. If both vessels are in a
timeout condition, no auto-fill cycle is possible.
If the Contacts option is selected, the Model 286 uses the remote
contact senses available in connectors J5A and J5B (see page 96 for
the pinout). The remote contact sense of J5A is used for AC Output
1, and the remote contact sense of J5B is used for AC Output 2. If
the respective remote contact is closed, the associated storage
vessel is assumed to contain liquid. Note that if a contact sense is
disconnected, this appears as an “open” remote contact and will
preclude fill from the associated storage vessel.
The user may also optionally define a fill timeout that can be used
as fail-safe indicator if the contacts method of empty detection is
selected.
4.3.8.4 Changeover Time
If the timeout method of empty detection is selected, then a
changeover time can be specified. The changeover time defines the
maximum time allowed for the auto-fill cycle to complete before the
Model 286 assumes the storage vessel is empty and attempts to
complete the fill from the other storage vessel in the auto-
changeover system.
Empty Detection:
Use? $Timeout
Empty Detection:
Use? $Contacts
Changeover Time:
10.0 min