MAN0923_Issue 3_04/15 Touchpoint Pro
Operating Instructions
196
15. Appendix 2 - Congurable
Parameter Reference Guide
LTEL=(TEN_MIN_TWA1+TEN_MIN_TWA2+……….+TEN_MIN_TWAN)/LTELN
Where
LTEL = Long Term Exposure Limit TWA.
TEN_MIN_TWA1=1stTenMinuteTWA,
TEN_MIN_TWA2=2ndTenMinuteTWA
TEN_MIN_TWAN=NthTenMinuteTWA
LTELN = Number of Ten Minute TWA Samples received in 8 hours
Access Level: Engineer
Parameter Name Default Setting Value Range
LTEL Alarm Enable Disabled Enabled / Disabled
LTEL Alarm Level 10 %FSD According to sensor range
LTEL Alarm Latch Latching Latching / Non-Latching
15.1.13 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
15.1.14 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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