Oxygen Analyser Calibration - Parker MIDIGAS 2 Guia Del Usuario

5.5 Oxygen Analyser Calibration

Hot surfaces and hazardous live terminals. Take care when performing the following calibration procedure as there are
hazardous live voltages and potentially hot surfaces within the enclosure.
The O analyser should be calibrated at least once every three months
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against a calibrated gas supply or a calibrated independent
analyser.
For low purity applications the calibration may be performed using
compressed air, however this method is not recommended when the
purity of the gas is critical.
The purity of the calibration gas should not exceed 50ppm for high purity
generators (ppm oxygen cells) and 5% for lower purity generators (%
oxygen cells). Do not exceed 7barg pressure.
The pressure regulator and flow control valve are
factory set to deliver 250cc/min. to the O
Adjusting either component could cause damage to the
O cell or incorrect calibration.
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Using a calibrated gas supply
• Select menu 3.1 and enable the O
• Connect the gas supply to the O
the side of the generator.
• Locate the calibration ball valve (2) inside of the shroud and rotate
the handle clockwise so that it is pointing down as shown.
• Wait for the O reading to stabilise before entering the calibrated level.
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Using a calibrated independent analyser
• Select menu 3.1 and enable the O
• Connect the analyser to the nitrogen outlet port of the generator.
• Wait approximately for the O
Using compressed air
• Select menu 3.1 and enable the O
• Connect the O sample line between the elbow push in fitting, located on the ball valve (3), and the O
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If a sample line other than the one provided by Parker domnick hunter is used ensure that it is suitable rated for the
working pressure of the generator.
• Open the ball valve (3) and rotate the handle of the calibration ball valve (2) so that it is pointing downwards as shown.
• Wait for the O reading to stabilise before entering the calibrated level.
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The sample line will need to be depressurised prior to disconnection. Close the ball valve (3) and wait until the pressure
shown on the pressure gauge (4) reaches zero. When the line is fully depressurised, rotate the handle of the calibration
ball valve (2) so that it is pointing upwards and disconnect the line from the generator.
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cell.
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Alarm Over-ride.
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Analyser calibration port (1) on
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Alarm Over-ride.
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reading to stabilise before entering the calibrated level.
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Alarm Over-ride.
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Analyser calibration port (1).
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