IV CALIBRATION ADJUSTMENTS
14
The weight balance is checked using a sample that weighs 180
grams. Any 180g sample should read 64.5 kg/hI ±1.0 when lb/bu is
pressed,
kg/hi
i.e. between 63.5 and 65.5.
‘The weight balance should be reset if 180 g
weighs less than 63.5 kg/hi or greater than 65.5
kg/hi.
Capacitance
This is checked using .a capacitance reference sample. With the
sample in the cell press 0 and then press %H
2
0. The result should
be no greater than ± 0.6 from the value of the capacitance
reference sample.
If any of these measurements are out of tolerance, the instrument
should be reset.
As a daily check. the Q~ key can be used to
AUTO
c’heck that the instrument is set up correctly when the sample
cell is empty. The procedure is as follows:
Display Shows
1. Switch on.. _ HI — 1
2. Press CAL’ I AUTO
AUTO
After 5 seconds A 000
This indicates that for the empty sample cell test, the weight and
capacitance are within the limits. The first two zeros are
capacitance checks. The third 0 is’ the chec’k of the empty cell
weight.
NB.
If the display shows anything other than f A 000
then the
instrument needs to be reset.
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