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Percent Oxygen Analyzer Operation
Teledyne Analytical Instruments 35
2. Immediately (within 5 seconds) press either the Δ 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 Oxygen Calibration
There are two types of calibration one is air calibration, and the
other is span which uses some other gas other than air. Since the zirconia
sensor uses air as reference, the output is nearly zero millivolts. So, in
doing the air calibration, you are basically reading the offset of the
sensor. The span calibration (using gas other than air) would make the
sensor give an output other than zero, thus it is the high calibration.
4.6.1 Span Calibration
Connect a suitable span gas to the port on the side of the probe
head. To do this, remove the plug on the gland on the side of the probe
marked REF. See Figure 4.2 Attach the span gas at this port using a
suitable fitting and use a flow rate between 1-5 lilters per minute. The
span gas exits at the tip of the probe. A suitable span gas can be an
oxygen mixture between 1 to 16 %, with the balance being nitrogen.
Using a concentration between 1 to 5% is preferable, as the sensor will
yield a higher output.
Power up the instrument and allow the LED reading to stabilize.
Set the alarm setpoints and the full scale ranges to the desired values.
Figure 4-2: Calibration Port on Probe Head
Span Procedure:
1. Press the SPAN button once.
Note: The numeric LED starts flashing and will continue to flash