Zero Sensors

WARNING! 

Do not activate zero sensors unless you are certain you are in fresh, uncontaminated air; otherwise, inaccurate readings can occur which can falsely indicate that a hazardous atmosphere is safe.

If you have any doubts as to the quality of the surrounding air, do not use the zero sensors feature. Do not use zero sensors as a substitute for daily calibration checks. The calibration check is required to verify span accuracy.

Failure to follow this warning can result in serious personal injury or death.

Zero sensors will calibrate the zero readings (or 20.8% volume for oxygen) of the device. Zero sensors can be accessed from the device's menu. Zero sensors allows for wider sensor tolerances than a Fresh Air Baseline when it is performed.

To zero the sensors:

1.

Navigate to the Zero Sensors menu option.

2.

Confirm you are in fresh air.

3.

Press Start.