Kett AN-820, Руководство по эксплуатации

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6-4. BIAS Adjustment
With a rice-analysis device that applies Near-Infrared method like this unit, there
are times when the extended use of light-emitting parts, sensors, etc. experiences
minor changes that happen over time that can cause the measurement value to
change. The difference between AN-820 ’s measurement value and composition
values of standard samples (The known sample from the previous correct
composition value) is referred to as the bias.
To adjust bias of the unit, there are two models manual or automatic.
To set unit manually, prepare several standard samples which should be different
values per each composition, performing measurement as usually several times.
And then calculate requested bias per composition by manual.
To set unit automatically, prepare one standard sample, and as you measure
according to display, the automatic bias adjustment should run smoothly.
Note : With the automatic adjustment, you need only one standard sample, so it is often convenience
to do, but you need to be careful of doing the adjustment incorrectly when making mistakes with
standard sample or doing other things to throw off the results.
(1) Protein CM Display (CM : Constant Moisture basis)
AN-820 ’s protein content shows the percentage contain in terms of whole grain, including
moisture. This altenative is convenient at times, when you are, for example, calculating the
weight of protein inside grain that was measured. But when you compare proteins among
many different moisture is contained, there are times when it is convenient to assume the fixed
moisture content. This consideration is “CM Protein” which is displayed as protein conversion
by assuming the fixed moisture content (with AN-820, this is the same as the “@ Moisture %” is
specified). When the fixed moisture content is assumed to be “ 0% ”, this is referred to as a “dry
conversion” (DM : Dry Moisture Basis)
The conversion formula is as follows, so if Protein, Moisture, and / or “@ Moisture %” are set
incorrectly, The “CM Protein” conversion value will not be displayed correctly.
(2) Calculation of Q.E.V. (Quality Evaluation Value)
Calculation of Q.E.V is based on moisture and Protein (as is) when “Protein CM” is not set.
When moisture is set under 10% and “Protein CM” , Q.E.V is calculated based on Moisture and
CM (as is). When Moisture is set over 10%, and “Protein CM” , Q.E.V is calculated based on
preset Moisture and Protein (CM).
Protein × (100
－
@ Moisture %)
100-Moisture
Protein CM =