PureAire Monitoring Systems, Inc.
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6: Maintenance & Sensor Verification
Only qualified personnel should perform maintenance and sensor verification
6.1 Sensor Verification
The earth is a stable source of calibrated oxygen at 20.9%, therefore under ambient
conditions you can perform a visual verification of the
Air Check
O
2
monitor to verify
it’s reading at 20.9%. As the oxygen sensor ages over time, it may require a slight
adjustment to 20.9%. The O
2
monitor also requires periodic testing with nitrogen to
verify the cells response to 0% oxygen.
6.1.1 Sensor Verification Gas
For testing the
Air Check
O
2
monitor, PureAire recommends the use of
nitrogen. This can be purchased from your gas supplier, or the gas supplier
listed
below:
6.1.2 Sensor Verification Equipment
This can be purchased from your gas supplier or from the gas supplier listed
below:
Part Number
Description
Quantity
Calgaz/Air Liquide Nitrogen 103 liter cylinder, 99.99%
p/n CZF6D400281
1
Calgaz/Air Liquide Regulator, Model 715 500 cc per minute flow
p/n CZF7R000255
1
Calgaz/Air Liquide Zero Grade Air 103 liter cylinder
p/n CZF6D040283
1
NOTE:
If the instrument is connected to a controller, set the controller to the
standby mode to avoid accidental alarms.
NOTE:
If your safety protocol requires, you may subject the Air Check
monitor to different concentrations of oxygen span gas.
*Air Liquide can be reached at 800-638-1197
