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Trace Oxygen Analyzer Operation
Teledyne Analytical Instruments 53
change from ppm units to percent when the concentration is above
10,000 ppm.
4.6.2 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/M ED,
or FX/H I to set the instrument on the desired fixed range (low, medium,
or high).
L—100 M—1000
H—1 0000 Mode—FX/ LO
or
L—100 M—1000
H—1 0000 Mode—FX/MED
or
L—100 M—1000
H—1 0000 Mode—FX/ HI
Press Escape to re-enter the Analyze mode using the fixed range.
Note: When performing analysis on a fixed range, if the oxygen
concentration rises above the upper limit (or default value)
as established by the operator for that particular range, the
output saturates at 1 VDC (or 20 mA). However, the digital
readout and the RS-232 output continue to read the true
value of the oxygen concentration regardless of the analog
output range.