Threshold Alarm Hysteresis - Honeywell touchpoint Pro Operating Instructions Manual

MAN0923_Issue 3_04/15
15. Appendix 2 - Configurable
Parameter Reference Guide

15.2.10 Threshold Alarm Hysteresis

Access Level: Engineer
Parameter Name
Threshold Alarm Hysteresis 2 %FSD
15.2.11 Rate Alarm Settings 1
Note: The Rate of Change Alarm is set when a specific 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 configured. 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
Rate Alarm Enable
Rate Alarm Level
Rate Alarm Trigger
Rate Alarm Latch
15.2.12 Rate Alarm Settings 2
Access Level: Engineer
Parameter Name
Rate Alarm Time Interval
Default Setting Value Range
0.0 to 10.0 %FSD The hysteresis value will be applied to a channel coming out
Default Setting
Disabled
5 %FSD
Rising
Latching
Default Setting
1 s
Comment
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.
Value Range
Enable / Disable
According to sensor range
Rising / Falling
Non-Latching / Latching
Value Range
1 s to 30 s
204
Touchpoint Pro
Operating Instructions
Comment
Determines the Rate Alarm
evaluation interval.