21
Alarm Settings
During each measurement period, the gas concentration is compared with the
programmed alarm limits (Low, High, TWA and STEL). If the concentration
exceeds any of the preset limits, the loud buzzer and red flashing LED are
activated immediately to warn of the alarm condition. Press the Right key to
enter the Alarm Setting menu.
Alarm Limits
In this menu, the High, Low, STEL, and the TWA
alarm limits can be changed. Press the Right key
to enter the Alarm Limits menu.
High Alarm
The High Alarm limit is set by the instrument to match the default value
for the current measurement gas. To change the High Alarm limit, press
the Up or Mode key to increase or decrease each digit’s value, and the
Right or Left key to move the cursor. Move the cursor to ‘
√
’ after the
setting is complete, and press Up to save and exit.
Low, STEL and TWA Alarms
Set the Low, STEL and TWA Alarm limits in the same manner as described above for the High
Alarm limit.
Note:
All default alarm limits depend on the measurement gas and are expressed in ppm.
Alarm Mode
There are two selectable alarm modes:
Latched
When the alarm is triggered, it stays on even when the concentration falls back below the alarm
limit. The alarm must be stopped manually by pressing the Right key. The latched setting only
controls High, Low, STEL, and TWA alarms.
Automatic Reset
When the alarm condition is no longer present, the alarm stops automatically.
Press the Up or Mode key to step from one alarm mode to the other. Press Right to select an alarm
mode followed by Left to save and exit.
Alarm Settings
The buzzer and light alarms can be programmed to be on or off individually or in combination. The
choices are:
•
Both on
•
Light only
•
Buzzer only
•
Both off
Press the Up or Mode key to step from one option to the next. Then press Right to make a selection
followed by Left to save and exit.
Set High Alarm
_ 1 0 0 ppm
√ ×
Alarm Limits
High Alarm
Low Alarm
STEL Alarm
TWA Alarm
