Honeywell Touchpoint Pro Technical Handbook page 86

9.3.12 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
Note: Rate Alarms should always be set to Latching or connected to a latching input on other equipment. A non-latching
alarm will only be displayed whilst the rate is exceeded. The alarm will reset when the gas concentration achieves full scale
or the gas rate falls below the set rate.
9.3.13 Rate Alarm Settings 2
Access Level: Engineer
Parameter Name
Rate Alarm Time Interval
9.3.14 Inhibit Delay Settings
Access Level: Engineer
Parameter Name
Power-On Delay Enable
Fault Recovery Delay
Enable
Inhibit Delay Time
Part. No. 2400M2501_6
CONFIGURATION
Default Setting
Disabled
0.05*(Gas Range Max - Gas Range
Min)
Rising
Latching
Default Setting
1 s
Default Setting Value Range
Enabled Enabled /
Disabled
Enabled Enabled /
Disabled
30 s 5 to 3000 s
Value Range
Enable / Disable
Gas Range Min to Gas Range Max
Rising / Falling
Non-Latching / Latching
Value Range
1 s to 30 s
Comment
If enabled, the channel will be inhibited for a
specific time interval (the Inhibit Delay Time) after
power-up in order to prevent false alarms (e.g.
during sensor warm-up).
If disabled, the channel is inhibited for a fixed 5
second delay.
If enabled, the channel will be inhibited for a
specific time interval (the Inhibit Delay Time) after
a channel fault condition has been cleared in order
to prevent false alarms (e.g. due to sensor
recovery).
If disabled, the channel is inhibited for a fixed 5
second delay.
This is the delay time before a channel returns to
normal operation if the Power-On Delay or the
Fault Recovery Delay are enabled.
79
Comment
Determines the Rate Alarm
evaluation interval.
Touchpoint Pro
Technical Handbook