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Trace Oxygen Analyzer Operation 4
4-5
Teledyne Analytical Instruments
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: If the analyzer output goes above the high alarm setpoint or
below the low alarm setpoint, the front panel ALARM Indica-
tor, beneath the SET Function buttons, will blink. When the
SPAN key is pressed to enter SPAN mode, Alarm indicator
stops blinking.
2. Press the SPAN button once.
3. Within 5 seconds press either the ∆ or ∇ button until the display
is stable and reads 20.9 %.
The unit is now calibrated.
Note: If you use a span gas other than air, do not span in the
0-10 ppm range. Calibration at this level is not dependable.
Note: If you use a span gas other than air, and the span gas oxygen
concentration is less than 10,000 ppm, the analyzer could take
up to 65 seconds to to settle. The lag is caused by a digital
filter that is active only below 10,000 ppm (1%) oxygen.
If the output of the sensor as measured by the 3190 outside of the
expected range due either to:
a) Bad electrical connection between the unit and the sensor,
b) Improperly analyzed or entered calibration gas value,
c) Electronics failure
The unit will not accept the calibration attemped and flash 5000 on the
LED display unit a valid calibration has been performed.
4.7 Displaying Percent & PPM on the LED
Display
The analyzer displays the concentration in percent whenever the read-
ing is over 9999 ppm. When the reading changes to percent, the LED
display will alternate between flashing “PC” and the oxygen concentration.
On the other hand, if the instrument is displaying ppm, only the concentra-
tion reading will be shown.