Delta OHM HD45 Series Manual page 19

7. Relay activates above threshold A with hysteresis
The contact closes when the measuring value rises above threshold A value. The
contact opens if the measuring value falls below the threshold minus the
hysteresis (A-H).
8. Relay activates above threshold A and below threshold B with hysteresis
Relay action is different depending if threshold A value is greater or lower than
threshold B value.
If threshold A value is greater than threshold B value, the contact is closed if the
measuring value rises above threshold A value or falls below threshold B value.
The contact is open if the measuring value is within the interval ranging between
threshold B plus the hysteresis (B+H) and threshold A minus the hysteresis
(A-H).
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