Casella CEL CEL-281 - Manual (Page 18)

6. If necessary, view the current threshold level (at "Thr") by press-
ing the key once.
7. If necessary, press the key slowly sufficient times to
show the required threshold on the main display. Then press
the key again to display dose calculated using the new
threshold level.
1.8 Retrieve Peak Exceedance Times
With the CEL-281 switched ON, the keypad installed:
1. Press the key once.
The main display indicates current time.
2. If necessary, press the key again to check the date.
3. Press the + key combination once.
The main display indicates the first time or date when the
200 Pa level was exceeded. If the displays shows __:__:__ ,no
exceedance has occurred.
4. If time is indicated, press the key once to see the date.
5. If date is indicated, press the key once to see the time.
Page 10 - CEL-281 Operator's Handbook
Getting Started_