Fuji Electric ZKMA, Instruction Manual

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Hysteresis
:
If the value fluctuates around the condition value, there is a possibility that alarms occur frequent-
ly. When determining alarms, set a hysteresis width for the condition in order to prevent chattering.
For alarm check, set the percentage (%) of the range compared to the full scale as hysteresis width
(see the figure below).
This is common among “HH limit value,” “High limit value,” “Lower limit value,” and “LL limit
value.”
High limit judgment
Lower limit judgment
High limit value
Lower limit value
Hysteresis
Oxygen concentration value
HH limit value
LL limit judgment
HH limit judgment
LL limit value
HH / LL limit judgment
High / lower limit judgment