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If a zero is unsuccessful the AirGuard will display a fault screen.
Below is an example of low or no flow associated with the calibration regulator flow, on/off position
Enter the Span Function
Prepare the Span Gas (10 ppm Carbon Monoxide) cylinder.
Attach the regulator to the Calibration Span cylinder.
Connect the regulator to the calibration port on the side of the AirGuard.
Open the gas regulator fully by turning the on/off knob two turns counter clockwise.
The AirGuard will display a warning screen to make sure the compressor is disconnected.