YSI 9300 Photometer - Manual (Page 9)

Expressing Different Chemical Forms
If the test result can be expressed in different chemical forms, the chemical
symbol will have flashing and
to indicate this. Use the the and keys
to step through the options available.
Reading in Transmittance and Absorbance
When taking readings in Transmittance or Absorbance mode, use the and
keys to step through the wavelengths until the required wavelength is reached.
Timer
The photometer features a countdown timer with alarm as an aid to carrying
out test procedures. The timer can be accessed at any time by selecting
‘Timer’ from the ‘Options’ menu.
The following display will appear:
Timer
00:00
EXIT
Key in the time required in minutes and seconds, maximum 29 minutes and
59 seconds, using the numerical keys, then press [OK] to start the timer. Use
the and keys to reposition the cursor and re-enter the time if it is keyed in
incorrectly.
The timer will count down, giving an audible alarm at the end of the timed
period. Press [OK] to stop the alarm.
During the timer countdown period, an ‘Options’ menu is available :-
Stop - to abort the timing operation, or stop the alarm at the end of
the timed period
Exit - to return to the program screen to take readings. The timer
will continue to run and give an audible alarm at the end of
the period.
Exit and Read - to return to the program screen with the timer counting down
on screen - the instrument will automatically take a reading at
the end of the timed period - no alarm will sound.
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