ppbRAE 3000 User’s Guide
64
TWA Alarm
You can change the TWA (time-weighted average) Alarm limit value.
The value is typically set by the instrument to match the value for the
calibration gas. It is expressed in parts per billion (ppb). Note: The
default value depends on the measurement gas.
To change the TWA Alarm value:
1. Press [Y/+] to increase each digit’s value.
2. Press [N/-] to advance to the next digit.
3. Again, use [Y/+] to increase the number.
Repeat this process until all numbers are entered.
When you have completed your selections, press [MODE]. You will
see two choices:
Save
Undo
You have the opportunity to register the new settings or to change
your mind and revert to your previous settings.
Press [Y/+] to save the changes.
Press [N/-] to undo the changes and revert to the previous
settings.
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