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 wonderful source of calibrated oxygen at 20.9%, therefore under ambient
conditions; verification of the
Air Check
O
2
monitor to 20.9% oxygen is constantly
being performed. 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 from the gas
company 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
