MSA QuickCheck Altair 4 Manual De Instrucciones página 13

7. Test time may vary, based on the:
• instrument software version
• sensor condition
• gas tolerance level.
8. The gas tolerance level appears on the label located
on the bottom of the QuickCheck Station.
• Five tolerance levels are available.
• During a test, the gas tolerance level indicates where the read
gas levels must be to pass the gas test.
FOR EXAMPLE:
If a 30% gas tolerance level QuickCheck is used and the
calibration cylinder contains 60 ppm CO, the instrument sensor
must read or span above 42 ppm CO for the gas test to pass.
[60 - (60*.30) = 42].
• Oxygen is the only exception to this calculation.
Oxygen passes a test if the reading:
• for the 20% gas tolerance unit
is less than or equal to 17% O 2
• for the 30% gas tolerance unit
is less than or equal to 18% O 2
• for the 40% gas tolerance unit
is less than or equal to 19% O 2
• for the 50% gas tolerance unit
is less than or equal to 19.5% O 2 .
NOTE: A value of 15% must be used as a calibration
concentration for O 2 .
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