INST No INE -403-0P0
−
27
−
w
1-
w
2
w
1-
w
0
×１００
(%H
2
O)
7.2 Sample measurement
Be careful with the following cautions during measurement.
(1) Before measurement, warming- up of this moisture meter more than 1 hour is required.
(2) Place a sample at the same position as in actual measurement, set the calibration curve
number to 0, and read the display (absorbance "x").
(3) Perform the measurement rapidly.
7.2.1 Powder or granular
(1) Prepare the trays (Diameter 100 to 150mm, Depth about 20mm) by the same quantity as
the measuring sample quantity.
(2) Weigh the weight w
0
of each tray.
(3) Spread the sample being sealed in the polyethylene bag on the tray it till the surface
becomes flat and the bottom cannot be seen.
(4) Put the tray at the measuring position, set the calibration curve number to 0, and read the
display (absorbance "x"). If the measured value cannot be read easily, delay the response
by the smoothing function.
(5) Stir the sample rapidly with a spoon and measure it again. Repeat this measurement 2 or
3 times per sample.
(6) Weigh the weight w
1
of the tray together with the sample.
(7) Perform the same measurement sequentially about all samples.
(8) Put each sample together with its tray into a dryer, and dry it out to be the absolute dry
condition (for longer than 2 hours at 105 to 110ºC usually).
(9) Cool down the sample after drying, and weigh the weight w
2
of each tray together with
the sample.
(10) Record the measured value in the following table every measurement, and obtain the
moisture value by the following formula.
No. Absorbance "x" w0
W1
w2
Moisture value (%H
2
O)
1
x1
y1
2
x2
y2
3
:
x3
:
y3
:
N
xn
y4
7. Preparation of calibration curves
