The once-determined alignment will be typical for a particular platform construction; it
will now only depend on the manufacturing tolerances of the platform and the care taken
during installation (alignment!). This should be written down so that the determined
installation position used for installation of this type of platform is optimal right from the
beginning.
The efect is designed to enable the load cell to ofer two zero crosses when turned
around its central axis. When doing so, the sensitivity can be increased or decreased by
turning from around the zero point. That means that the shift errors can actually be
adjusted to the value of 0.0 kg, depending on the platform’s construction. This increases
the play for stack and of-center loading errors.
7.6.3
Systematically minimizing shift error
Result
Recommended action
Step 1:
No previous measurement
The load cells are installed in such a way
that all adjustment chambers point slightly
outwards, i.e. To the longitudinal edge of
the weighbridge,
α
= +20°.
Step 2:
If, after corner load correction, the irst
shift test does not produce satisfactory re-
sults:
In the center, lower readout than at the be-
ginning and end of the weighbridge.
Rotate all load cells outwards by
approx. -20° to position
α
= 0°.
In the center, higher readout than at the
beginning and end of the weighbridge.
Rotate all load cells by a20° to po-
sition
α
= 40°.
7 Preparing for calibration
Weighbridge Load Cell PR 6221
EN-29
Minebea Intec