Ashcroft GC55 - Differential Pressure Transducer with Digital Display - Manual (Page 17)

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11. switch operation – Hysteresis/Deadband
setting the upper limit .
This is the mode in which the switch operates with the setting value (A) as
the upper limit. The upper limit setting is determined when you select a
positive number (including 0) for setting value (b).
setting the lower limit.
This is the mode in which the switch operates with the setting value (A) as
the lower limit. The lower limit setting is determined when you select a neg-
ative number for setting value (b)