Define Instruments PRO-WEI100 Manual page 5

Tare This feature 'zeroes' the display, and is usually used to deduct the weight
of the container from the total weight, leaving only the weight of the
product.
This feature clears the current tare value and shows the gross weight on
Tare Reset
the display.
See 6.2H–K and Appendix A for instructions on setting up and operating these features.
2.4 - Zero maintenance
The Zero Maintenance feature is used to automatically compensate for slow drift in
loadcell output due to factors such as temperature change, rain and dust accumula-
tion over time.
When Auto Zero is enabled (see 6.4B), the controller display will zero automatically
if changes to the loadcell are within the user specified Capture Band, Motion Band
and Zero Band parameters (see 6.4C–E):
Capture Band (6.4C)
Motion Band (6.4D)
Zero Band (6.4E)
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This is the maximum number of display counts that the controller
will automatically zero within. The Capture Band is referenced to
the current zero value. If the input value on the load cell is not
within the Capture Band setting then the controller displays the
current loadcell value and does not zero.
Capture Band can be set from 1 to 254 counts, and should always be
set to less than the smallest weight to be measured. Setting the Cap-
ture Band to 0 will turn the auto zero feature off.
This provides a rate of change limit setting, to determine the num-
ber of counts/second allowed within the Capture Band. If the
count change is within the Capture Band, but the speed of the
count change is more than the selected Motion Band, then the
controller displays the current loadcell value and does not zero.
The Motion Band can be set from 0 to 255 counts. Typical value is 1
or 2 counts/sec.
This provides a limit for the number of counts of zero offset
allowed to accumulate, relative to the calibrated zero setting. If
the accumulated zero offset becomes greater than this window,
then the controller displays the current loadcell value and does
not zero.
The suggested limit for the Zero Band is 2% of the calibrated span. If
the controller fails to zero, check for mechanical or electrical faults.
PRO-WEI100-MAN-19V01 (0225)
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