A General Alarm (Mass or Response) is active during Survey mode
and while data logging. If the displayed reading (based on Time
Constant setting) exceeds the Alarm value, the alarm triggers.
Depending on settings in the ALARMS MENU, the display will flash
red or the LEDs on the membrane switch may flash or an audible
beeper may sound. All three of those alarm indications can be turned
ON/OFF through the ALARMS MENU.
Once triggered, the Alarm stays active until the displayed reading
drops below 95% of the Alarm value. The alarm can be “delayed” or
“muted” with the Ringback delay function. If the displayed reading is
more than 90% of the Alarm value, the display flashes yellow.
A STEL Alarm (Mass or Response) is active during data logging only
and is not active in Survey mode. If the displayed Time Constant
reading exceeds the STEL Alarm value, the STEL Alarm triggers.
When the STEL Alarm triggers, a STEL Record is started in the
logged data. A STEL Record contains the average concentration
taken every minute during the length of the STEL Record. Only the
concentration of the channel which triggered the alarm (Mass
Concentration or Response Factor Concentration) is recorded.
STEL Record length is selectable from 5 to 30 minutes through
TrakPro™ software. Since the start of a STEL Record is not usually
aligned with the Log Interval, the values of averages saved in the
STEL Record will generally not match the values saved each
Log Interval.
Ringback delay: The Ringback delay is a
user function that will “mute” an activated
alarm for the selected period of time.
General Alarms and STEL Alarms can be
muted for the duration of the Ringback delay
setting: 30 sec, 1 min, 3 min, 5 min, 10 min,
off. After the Ringback delay expires, the
Alarm will sound again.
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