Toshiba Density (Consistency) Meter LQ500, Руководство по эксплуатации

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(3-3) Reading and recording measured conductivity and density values
The externally installed conductivity meter is used to measure the conductivity (E
1
) of
the measured object fluid while, at the same time, reading the measured density (M
1
)
from the LCD indicator or from the LED display outside the converter. Take notes of
each measured value.
Next, while varying the conductivity of the measured object fluid, measure as well as
take notes of the conductivity (E
2
) and the measured density (M
2
). At this time, take
care to prevent the actual density of the measured obje ct fluid from changing.
E
1
, E
2
: Conductivity (mS/cm)
M
1
, M
2
: Measured density value (%TS)
(4) To calculate the electric conductivity correction factor
Obtain the electric conductivity correction factor (
γ
) in accordance with the following
arithmetic expression
.
γ
=
Δ
M/(a
×Δ
E)
a : Density line slope (see Table 9.1: varies with the aperture)
Δ
M : Measured density value difference (M
2
– M
1
)
Δ
E : Measured conductivity value difference (E
2
– E
1
)
For example, if the meter size is 150 mm, it follows that a = 0.056. At this time, let's assume
that the conductivity and the measured density (specified value) are as follows respectively.
1st measurement: E
1
=1 mS/cm M
1
=4.0%TS
2nd measurement: E
2
=2 mS/cm M
2
=4.2%TS
From here, it follows that
DE =1 mS/cm
DM=0.2 %TS
and the conductivity correction factor is
γ
= 0.2/(0.056
×
1)
= 3.57
(5) To correct the electric conductivity correction factor by means of the conductivity meter's
range.
In the event that the range of the conductivity meter being used is other than "0 to 10 mS/cm",
correct the conductivity correction factor in accordance with the conductivity meter range
while referring to the method of calculating the correction factor in the event that the
conductivity meter range is other than the standard described in Subsection 10.4.1.
(6) To set the ele ctric conductivity correction factor
In the same manner as the operation described in (2), set the electric conductivity correction
factor to the value calculated in (4) and (5).
(7) To return the density multiplier to its original value
In the same manner as the operation described in (1), return the density multiplier to its original
value which has been previously recorded.
(8) To return to the measuring mode
Press the [ESC] key twice to return to the initial menu screen and return to the measuring