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Testing and Adjustment Sequence on Balances/Scales with
Strain Gauge Systems
Preparations: Place the balance/scale on a solid, level surface that is free of vibration, e.g.
a stone table. Level the balance/scale using the level indicator. Turn the balance/
scale and allow it to warm up for about 30-60 minutes, depending on the model.
Calibrate/adjust the balance/scale on this place.
Note: Testing must be carried out according to the following Sartorius Standard Operating
Procedure for Testing WKD-037-02 and WKD-038-02. They are also equivalent to the
given adjustment data as described in this service manual.
You will need to check and, if necessary, adjust the following:
1. Overload stop
2. Zero point offset adjustment
3. Repeatability
4. Off-center loading error
5. Span adjustment
6. External linearity
Checking the Overload Stop
Note: Overload stops only need to be checked after replacing a strain gauge system.
Setting the Overload Stop
Setting the overload stops is only necessary in the case of mechanical damage or
after replacing the load cell!
After opening the balance/scale , screw off the load plate and remove it from the
weighing system.
If there is only one load plate, the two screws (A) have to be removed to obtain
access to the strain gauge.
Adjust the two overload stop screws (B) so that a distance of about 0.1 mm (paper-
thick) remains between the screws and the base plate when the maximum load plus
around 10% is placed on the balance/scale.
Caution: The overload stop screws (B) are not lock nuts. If ERR 02/03 appears during
adjustment work, make that the overload stop screws are at the proper setting.
Testing and Adjustment Sequence on Balances/Scales with Strain Gauge Systems
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