Calibration Methods; Operation - Nuvair Pro O2 alarm Analyzer Operation Manual

3.1. Calibration Methods

Calibration should always be performed at the same temperature and humidity conditions as
the gas being measured. This is not always possible, for example, in a tropical environment
where dry breathing gas from a high-pressure scuba cylinder will be measured after Analyzer
calibration has been performed in the warm, humid ambient air. Under these conditions a
calibration correction value may be required, or dry air must be used for calibration. It may be
required for the analyzer to be auto calibrated to a certified calibration gas.
Obtain proper training before attempting special calibration procedures. Improper
calibration may result in the use of incorrect breathing gas mixtures, which may cause
serious injury or death to the person using the gas mixture.
To assure the greatest accuracy for other applications, use the calibration gas concentration
closest to the expected concentration in the gas being measured.

4.0 Operation

Prior to each Analyzer use:
1) Turn unit on by holding on/off button for 2 sec, until display shows "On", after that the
"Att" (Wait) message will be displayed for about 4 seconds, then the sensor auto-
calibration procedure is started.
2) The auto-calibration last about 5 seconds; during this time the display will show the
message "CAL" and "Att" alternatively. Be sure during this time the exposed to the gas
mix with oxygen percentage as programmed in the O2c (calibration) parameter (SEE
PROGRAMMING PROCEDURE). By default, for simplicity, the O2c value is set at 21%
that corresponds to the percentage of Oxygen in free air in this case be sure that flows
air on the sensor before switching on and during the warm up time.
3) At the end of the warming up and calibration time, the display will show the blinking
value in mV read from the oxygen sensor during calibrations: the instrument is now
ready to read oxygen concentration of the gas.
4) Connect the sensors flow adaptor to the gas. The flow rate of gas must equal 1 – 5
L/min. To produce this flow, a Flow Restrictor and Regulator may be required. See
Spares and Accessories section. The display will now read the oxygen content
continuously of the gas flow.
5) While the analyzer is displaying the oxygen percentage press the calibrate button for
more than 1 second to initiate the mV output display mode. It is important to
periodically monitor this value in order to confirm the sensor is working properly and
not expired.
Gas, even under moderate pressures, can cause extreme bodily harm. Never allow any
gas stream to be directed at any part of your body.
NUVAIR Rev.02.01.2012
Pro O alarm Oxygen Analyzer Manual
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alarm Oxygen Analyzer
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