Honeywell BW Flex Series User Manual page 16

Calibrate the detector if the gas readings varies during start up.
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Calibrate the sensor before defining the alarm setpoints.
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Calibrate only in a safe area that is free of hazardous gas in an atmosphere of 20.9% oxygen.
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Do not calibrate the detector during or immediately after charging is complete.
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The oxygen sensor can be automatically calibrated each time upon activation (if this feature
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is enabled). Activate the detector in a normal (20.9%/20.8% oxygen) atmosphere.
Allow the detector to stabilize for 1 minute after activation before performing a calibration or
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bump test.
If a certified calibration is required, contact Honeywell.
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BW Flex Series 15 User Manual