Honeywell Touchpoint Pro Technical Handbook page 77

9.2.14 Rate Alarm Settings 1
The Rate of Change Alarm is triggered when a specific rate of rise or fall is observed (the Rate Alarm Trigger can be set
as Rising or Falling).
The Alarm Level and the Alarm Interval can be configured. E.g. If the Alarm Level = 10 %LEL and the Alarm Interval = 5
s, the Rate Alarm triggers 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.
9.2.15 Rate Alarm Settings 2
Access Level: Engineer
Parameter Name
Rate Alarm Time Interval
9.2.16 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 Value Range
1 s 1 s to 30 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
Comment
Determines the Rate Alarm evaluation
interval.
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 is enabled.
70
Touchpoint Pro
Technical Handbook