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In Table 9.3.1 above,
C: Density multiplier (Varies with the character of the measured matter.)
a: Density slope
The values of the respective meter size in C = 1, 0.7 and 1.8 as examples of the value X
N is judged to be too large are listed in Table 9.3.2. Each of the values is the result of the value
when C=1 in Table 9.3.2 multiplied by C.
C
50mm
42.34
0.7
60.48
1.0
108.86
1.8
9.3.5
Restrictions and invalidation in applying the automatic adjustment of phase angle
rotations
This function of automatic adjustment of phase angle rotations involves some application
restrictions. For example, it cannot be applied to the case of measuring high density as follows.
<Example> In the case of meter size: 150 mm; upper density measurement range: 20%TS; and
density multiplier: 0.7
As shown in Table 9.3.2, X
exceeds 14.11(%TS), the adjustment of decreasing the number of phase angle
rotations applie s as shown in Table 9.3.1, thus making it impossible to measure the
density in excess of 14.1(%TS).
To solve the problems as shown in the example above, measurement is taken so that the function of
automatic adjustment of phase angle rotations is automatically invalidated if the upper measured
density range exceeds X
Check the operating conditions to see if the function of automatic adjustment of phase angle
rotations is applicable or not.
[NOTE]
In the cases where the automatic adjustment of phase angle rotations is not applicable, after
the density meter detector is temporarily made empty, it is necessary to reset the phase angle
rotation to an appropriate value through manual input. In the cases, it is more desirable to
perform the external synchronized operation.
9.3.6
Invalidation by setting the automatic adjustment of phase angle rotations
As mentioned in the previous subsection, the density meter is equipped with the function of
automatically invalidating the function of automatic adjustment of phase angle rotations, based on
the conditions for setting the upper density measurement range and the density multiplier.
However, in the state of starting the operation, the upper density measurement range is determined
but the density multiplier is not determined yet (determined in the span calibration described in
Section 6.5), thus the operation is started with a provisional value (initial value: 1). Therefore, the
function of automatic adjustment of phase angle rotations, which is supposed to be invalidated, may
not be invalidated, making it impossible to take an appropriate measurement (including the span
calibration). This applies to the case in which the original density multiplier is smaller than the
current set value (the initial value 1 in the initial operation).
(A constant determined by the meter size)
Table 9.3.2 Value of X
80mm
100mm
150mm
26.46
21.17
37.80
30.24
68.04
54.43
=14.11(%TS). Therefore, when the measured density
max
.
max
79
(%TS)
MAX
Aperture
200mm
250mm
14.11
10.57
20.16
15.12
32.29
27.22
6 F 8 A 0 5 2 1
in which
max
300mm
8.57
7.06
12.24
10.08
22.03
18.14
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