Auto Zero Maintenance

Automatic drift compensation for load cell applications

Technical Documentation › Auto Zero Maintenance

The auto zero maintenance feature automatically compensates for gradual drift in load cell output caused by temperature fluctuations and dust buildup. The controller maintains zero readings when three programmable conditions are met.

Auto Zero Capture Band [AZ_C]

This sets the maximum display count range for automatic zeroing, referenced from accumulated zero counts. The setting range is 1–254 counts and should remain below the smallest measurable weight. When drift exceeds this band, the controller stops zeroing and displays the change.

Auto Zero Capture Band diagram

Auto Zero Motion [AZ_M]

This establishes a rate-of-change limit measured in counts per second within the capture band. Even if changes stay within the capture band, exceeding the specified counts-per-second threshold causes the controller to halt zeroing. Settings range from 0–255 counts, typically below the capture band value.

Auto Zero Motion diagram

Auto Zero Aperture Window [AZ_A]

This limits accumulated zero offset relative to calibrated zero. Exceeding this window stops auto zero operation. The suggested limit for the aperture window is 2% of the calibrated span.

Auto Zero Aperture Window diagram

The system automatically maintains zero when load cell changes remain within all three parameters.