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7-4. Moisture preparation
In the measurement of moisture content, if samples to fully cover the measurement range cannot
be prepared in the regular moisture control process (drying or adding water), prepare the samples
by moisture preparation. To derive a sample with different moisture by moisturising or drying a
source sample is called "moisture preparation". There are various ways to change the moisture
content, such as spraying water using an atomizer or drying the high moisture content sample.
Make samples with different moisture by selecting an optimum method according to the measuring
object. Also, when samples are made by moisture preparation, it is recommended to wait five to
seven days until added water is well soaked to obtain better consistency of moisture. Then, perform
measurement following the next section "7-5 Standard composition measurement" and "7-6 Making
the calibration curve (optical measurement)".
7-5. Measuring the standard composition
Precisely measure the composition of a part of each sample.
(Apply the over-drying method, etc. for the moisture content.)
Then, consider the obtained data as the standard composition.
* As the over-drying method, the official method or a measurement using an infrared moisture analyzer is
available.
* Note that the sample cannot be reused in the standard composition measurement.
* If the sampling amount is not sufficient or when performing the standard composition measurement and
actual measurement using the same samples, perform the optical measurement described in "7-6 Making
the calibration curve (optical measurement)" first, then measure the standard composition.
7-6. Making the calibration curve (optical measurement)
Set the main unit. (→ 5. Preparing the main unit (P.10))
Use the supplied PC software to create a calibration curve.
For details, refer to the PC software operating manual (4-1. Making the calibration curve).
Perform measurement under the same condition in making calibration curve and regular
measurement.
7-7. Correction
Setting the offset value and tilt correction value will enable correction of measurement value.
* no. how to set the offset value and tilt correction value, refer to the items described in "Setting the channel
parameter" (P.20) or the PC software operating manual (4-2. Correction).
Composition value (displayed composition) after correction =
Composition value before correction x Tilt correction value + Offset value
