Percent Oxygen Analyzer Operation 4
4-5
Teledyne Analytical Instruments
4.5 Selecting a Fixed Range or AutorangingThe Model 3300PA can operate in fixed high, fixed low, or
autoranging mode. To change modes:
1. Press and then release the SET HI RANGE and the SET LO
RANGE buttons simultaneously.
2. Immediately (within 5 seconds) press either the ∆ or ∇ button
until Auto, Lo, or Hi displays on the LCD, as desired.
After about three seconds, the analyzer resumes monitoring in the
selected range mode.
4.6 CalibrationPreliminary—If not already done: Power up the Analyzer and
allow the LED reading to stabilize. Set the Alarm setpoints and
the fullscale ranges to the desired values.
3300PA SpanProcedure:
1. Press the SPAN button once.
Note: The numeric LED starts flashing and will continue to flash for five
minutes before timing-out. During this five minutes interval, the LED
will continue to track gas through the analyzer.
2. Flow span gas of a known oxygen concentration into the
analyzer. The analyzer will begin to track the span gas.
Note: The alarms will not change state during span calibration.
3. When the meter stabilizes, use the UP/DOWN arrows to adjust
the analyzer span value to the exact percent O2 concentration in
the span gas.
Note: When an arrow button is first pressed, the LED begins flashing
slightly more rapidly and no longer tracks the span gas. Instead, it
responds to the UP/DOWN keystrokes.
Note: While the LED is flashing slightly more rapidly, the SPAN routine will
time-out in five seconds (instead of five minutes), if no further key-
strokes are entered.
4. When the span value is set to the known concentration of O2 in
the span gas, stop pressing the keys and wait for five seconds.