I INTRODUCTION
1
This, oscillating weight balance, which was developed from
space technology, uses frequency measurement to determine
mass (weight in grams). The weight is measured by reference
to a frequency, which varies with mass and is detected
through an electro—magnetic system and processed by the
computer. This weighing technique offers flexibility in
sample size allowing the use of samples between 20 and 240
grams.
3. Temperature Correction
The capacitance of a sample increases with temperature. A
temperature sensing thermistor is mounted in the sample cell
and the microprocessor carries out an automatic correction.
The capacitance corrected for weight and
temperature is known as the instrument reference reading but
in practice it is commonly referred to as the capacitance
value.
III OPERATING INSTRUCTIONS
111:1 MEASURING % MOISTURE CONTENT
a) Place the hopper on the sample cell
ensuring the hopper slider is in the closed position.
b) Pour the sample into the hopper ensuring the amount
used will not exceed level “A” (see Section IX) when
the cell is filled. Experience will tell you how much
of each product type you need.
[See point C) in ‘Notes on Instrument Use’).
C) Tap slider upwards to allow the sample
to flow through the hole and into the cell.
d) Remove hopper.
Check that the cell is not overfull. If the sample is
heaped on one side, refill sample cell again. Any sample
remaining on the cell cap should be brushed off into the
sample cell.
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