Teledyne 3000MA - Paramagnetic oxygen analyzer - Manual (Page 45)

Percent Oxygen Analyzer Operation 4
4-15 Teledyne Analytical Instruments
4.6.1 Setting the Analog Output Ranges
To set the ranges, enter the range function mode by pressing the
Range button on the front panel.
L—1.00 M—5.00
H—10.00 Mode—AUTO
Use the < > arrow keys to blink the range to be set: low (
L), medium
(
M), or high (H).
Use the
∆∇
arrow keys to enter the upper value of the range (all ranges
begin at 0 %). Repeat for each range you want to set. Press Enter to accept
the values and return to Analyze mode. (See note below.)
Note: The ranges must be increasing from low to high. For example,
if range 1 is set as 0–1 % and range 2 is set as 0–10 %, range 3
cannot be set as 0–5 % since it is lower than range 2.
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.