Teledyne 3290 - OEM percent oxygen analyzer - Manual (Page 37)

Percent Oxygen Analyzer Operation
Teledyne Analytical Instruments 27
Procedure:
1. Expose the sensor to ambient air or instrument grade air (20.9%
oxygen). Allow time for the sampling system to purge and the
analyzer to achieve equilibrium.
Note: Teledyne recommends not to use breathing air cylinders
as a calibration source since the oxygen concentration has
been found to vary between 19.5-23.5% oxygen. Always
refer to the analysis certificate supplied with the gas
cylinder and use the analyzed concentration for the
calibration value. This will ensure the maximum accuracy
for the analyzer.
Note: If the analyzer goes overrange, the display will go blank
and the front panel ALARM Indicator, beneath the SET
function buttons, will blink. Hold down the SPAN button
until the ALARM Indicator stops blinking.
2. Press the SPAN button once.
3. Immediately (within 5 seconds) press either the  or  button
until the display is stable and reads 20.9%.
The unit is now calibrated.
Note: The alarms will be disabled for about 25 seconds after the
SPAN button is released. Disabling the alarms allows air to
be purged from the sample system without tripping any
alarm set below span (20.9%). Do not attempt to adjust
any alarm setpoints while the alarms are disabled during
the 25-second period.