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CHAPTER 4 - CALIBRATION
About Calibration of
the Hardy Bench Scale
C2 Second Generation
Calibration
The Hardy Bench Scales come calibrated from
the factory. Make sure the scale is correctly wired
to the weighing instrument or indicator. Refer to
the weighing instrument or indicator manual for
calibration instructions.
C2 electronically calibrates a scale system with-
out the need for test weights. If you are using a
Hardy Process Solutions Weight Controller,
Weight Processor, Indicator or Weigh Module, all
that’s required is to enter a reference point. Refer
to the instrument or module manual for calibra-
tion instructions using C2
Test Weight
Calibration (Hard Cal)
This is the traditional means of calibration requir-
ing certified class F test weights equal to a mini-
mum of 80% of the rated scale capacity.
Three weights between 10% and 100% of the
scale capacity should be available to check the
mid-range. Several low capacity weights equiva-
lent to one or two instrument divisions are neces-
sary to check the system sensitivity.
Material Substitution
When certified test weights are not available you
can use an accurately weighed material to cali-
brate the system. In this method, a material is
weighed on a secondary, calibrated scale and
delivered to the site of the scale to be calibrated.
The secondary calibrated scale should be of the
same accuracy or greater and have a capacity
approximately equal to the scale being cali-
brated.
