Casella CEL CEL-281 - Manual (Page 63)

+ (both keys pressed simultaneously)
While in calibration delay or calibration modes or when the
display has been switched off, this key combination will be ig-
nored.
In any other display mode, this key combination cancels the
other mode and displays the first time and date (since the cur-
rent data record was started) at which the 200 Pa level was ex-
ceeded in hh:mm:ss format for time, where hh = hours, mm =
minutes, and ss = seconds, or dd:mm:yy for date where dd =
day, mm = month, and yy = year.
The display will indicate _ _:_ _:_ _ if the 200 Pa level has not
been exceeded.
Pressing the key displays the last time or date at which
the 200 Pa level was exceeded, then pressing the key dis-
plays the first exceedance time or date.
Then pressing the key displays the time at which 200 Pa
was exceeded, while pressing displays the date.
3.3.10 "Q" Key
(yellow key: selects results calculated with different exchange
rates Q)
This key is active only while %Dose, Projected %Dose or L AVG
values are being displayed. While they are being displayed, re-
peatedly pressing the key cycles through results calculated with
CEL-281 Operator's Handbook - Page 55
How It Works