Teledyne 3300PB - Low cost percent oxygen analyzer - Manual (Page 29)

Percent Oxygen Analyzer Operation 4
4-5 Teledyne Analytical Instruments
4.5 Selecting a Fixed Range or Autoranging
The Model 3300PB 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 Calibration
Preliminary—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.
3300PB 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 O
2
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 O
2
in
the span gas, stop pressing the keys and wait for five seconds.