Teledyne 3000PA - General purpose percent oxygen analyzer - Manual (Page 48)

4 Operation Model 3000PA
4-16 Teledyne Analytical Instruments
4.6.2 Autoranging Analysis
Set your analysis ranges as in 4.6.1, above. Leave Mode in Auto , or
use the arrow buttons to change back to Auto .
When operating in autoranging, if the oxygen concentration in your
sample goes ABOVE your HIGHEST range setting, the analyzer will go
into the special 25 % cal range.
However, if one of your range settings is below 0-25 % and another is
set above 0-25 %, the special 0-25 % Air Cal range will NOT activate as the
oxygen level goes through 25 %. Nevertheless, if the oxygen concentration
in your sample goes ABOVE your HIGHEST range setting, the analyzer
will THEN drop back down into the special 25 % cal range.
Once the oxygen concentration drops back down into your highest
range setting, the analyzer will automatically switch back to that range.
CAUTION: While the analyzer is in the Air Cal range, the oxygen
reading cannot go over 25 %, even if the oxygen
concentration is higher than 25 %.
4.6.3 Fixed Range Analysis
The autoranging mode of the instrument can be overridden, forcing the
analyzer DC outputs to stay in a single predetermined range.
To switch from autoranging to fixed range analysis, enter the range
function by pressing the Range button on the front panel.
Use the < > arrow keys to move the blinking over AUTO .
Use the
∆∇
arrow keys to switch from AUTO to FX/LO , FX/MED, or
FX/HI to set the instrument on the desired fixed range (low, medium, or
high).
L—1.00 M—5.00
H—10.00 Mode—FX/LO
or
L—1.00 M—5.00
H—10.00 Mode—FX/MED
or
L—1.00 M—5.00
H—10.00 Mode—FX/HI