5200 Multi Purpose and 5200 Multi Purpose HF Gas Analysers
05230001A / Revision 944
6.5.3 Hysteresis levels
The hysteresis level associated with a measurement alarm determines when an alarm
condition (once activated) is deactivated, and this depends on the alarm mode, as
follows:
For example:
• If a ‘low’ alarm has an alarm level of 18% and a hysteresis level of 1%, the alarm
will be activated when a sample measurement is < 18%, and the alarm will not be
deactivated until a sample measurement is > 19%.
• If a ‘high’ alarm has an alarm level of 20% and a hysteresis level of 2%, the alarm
will be activated when a sample measurement is > 20%, and the alarm will not be
deactivated until a sample measurement is < 18%.
Alarm mode Effect of hysteresis
Low alarm Once the low alarm condition has been activated, the
alarm condition will not be deactivated until a sample
measurement is above (alarm level + hysteresis level).
High alarm Once the high alarm condition has been activated, the
alarm condition will not be deactivated until a sample
measurement is below (alarm level - hysteresis level).
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