Xylem 6308DT INDUSTRIAL DISSOLVED OXYGEN TRANSMITTERS - Manual (Page 16)

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If the relay action is set to HIGH and the hysteresis mode is CENTER,
the relay will turn ON at [(RELAY SETPOINT) + (0.5 * hysteresis value)],
and will turn OFF at [(RELAY SET POINT) - (0.5 * hysteresis value)].
If the relay action is set to HIGH and the hysteresis mode is EDGE, the relay will
turn ON at (RELAY SET POINT), and will turn OFF at [(RELAY SET POINT) -
(hysteresis value)].
If the relay action is set to LOW and the hysteresis mode is CENTER, the
relay will turn OFF at [(RELAY SET POINT ) + (0.5 * hysteresis value)], and
will turn ON at [(RELAY SET POINT) - (0.5 * hysteresis value)].
If the relay action is set to LOW and the hysteresis mode is EDGE, the relay will
turn ON at (RELAY SET POINT), and will turn OFF at [RELAY SET POINT+
(hysteresis value)].