MAN0923_Issue 3_04/15 Touchpoint Pro
Operating Instructions
204
15. Appendix 2 - Congurable
Parameter Reference Guide
15.2.10 Threshold Alarm Hysteresis
Access Level: Engineer
Parameter Name Default Setting Value Range Comment
Threshold Alarm Hysteresis 2 %FSD 0.0 to 10.0 %FSD The hysteresis value will be applied to a channel coming out
of an alarm condition, e.g. if the alarm level is 20 %FSD, and
hysteresis is set to 2 %, the alarm will not be cancelled until
the reading has dropped below 18 %FSD.
15.2.11 Rate Alarm Settings 1
Note: The Rate of Change Alarm is set when a specic rate of rise (or fall; depending if the Rate Alarm
Trigger is set as Rising or Falling) is observed. The Alarm Level and the Alarm Interval can be congured. If
the Alarm Level = 10 %LEL and the Alarm Interval = 5 s, the Rate Alarm will be set if the concentration has
risen by 10 %LEL within 5 s.
The rate alarm is calculated from the displayed reading.
Note: If zero suppression is used it has the effect of sensitizing the rate alarm. It is recommended to set the
rate alarm to twice the suppression band value to avoid nuisance alarms.
Access Level: Engineer
Parameter Name Default Setting Value Range
Rate Alarm Enable Disabled Enable / Disable
Rate Alarm Level 5 %FSD According to sensor range
Rate Alarm Trigger Rising Rising / Falling
Rate Alarm Latch Latching Non-Latching / Latching
15.2.12 Rate Alarm Settings 2
Access Level: Engineer
Parameter Name Default Setting Value Range Comment
Rate Alarm Time Interval 1 s 1 s to 30 s Determines the Rate Alarm
evaluation interval.
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