QRAE II User Guide
Page 29
3. Press [MODE] to select either the other arrow or to advance to Save or Quit.
4. With Save selected, press [Y/+] to save your settings, or [MODE] to advance to
Quit (without saving settings).
If you choose to quit without saving the changes, press [Y/+]. You will see this message:
Not Saved!
If you want to make further changes to the settings, press [MODE] to repeat stepping
through the choices.
Back. Press [MODE] to return to the top of the Calibrate Monitor menu, or press [Y/+] to
return to the top of the Normal Mode menu.
4.5.4 Change Alarm Limits
The high and low alarm limits, as well as the points at which the STEL and TWA alarms
are triggered, can be modified in this set of menus. Each sensor’s limits for each of these
can be set separately, providing extremely precise alarm thresholds.
Alarm Signals. During each measurement period, the gas concentration is compared
with the programmed alarm limits (gas concentration alarm limit settings: Low, High,
TWA and STEL). If the concentration exceeds any of the preset limits, the loud buzzer,
red flashing LED, and vibration alarm are activated immediately to warn of the alarm
condition. In addition, the QRAE II alarms if one of the following conditions occurs:
battery voltage falls below a preset voltage level (3.1 volts for Li-ion, 3.3 volts for
alkaline batteries), or when the datalog memory is full. When the low battery alarm
occurs, there will be approximately 20 to 30 minutes of operating time remaining. When
the battery voltage falls below the low threshold, the QRAE II turns off automatically.
Submenus in this section are:
High Alarm Limit
Low Alarm Limit
Stel Alarm Limit
Average Alarm Limit
The submenus and actions are shown in the following diagram:
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