Toshiba Density (Consistency) Meter LQ500, Руководство по эксплуатации

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
98

6 F 8 A 0 5 2 1
Meter-measured value X
O
(density multiplier 1.000) before linearization and meter-measured
value X after linearization have the following relationship.
For X
0
≤
A X = C ( K
1
X
0
)
For A < X
0
≤
B X = C { K
1
A
＋
K
2
( X
0
−
A)}
For B < X
0
X = C { K
1
A
＋
K
2
( B
−
A ) + K
3
( X
0
−
B )}
where
C: Density multiplier.
The procedures for making 1inearizer lines and setting them into the meter are as follows:
(1) Create a graph
Plot the relationships between the meter-measured value (X
0
) at a density multiplier of 1.000
and manual analysis value to make into a graph as shown in figure 10.6.1.
(2) Draw approximate straight lines
Draw in three straight lines that approximate the relationships.
(3) Read densities at crosspoints
Read the meter-measured values (X
O
) at the cross-points of these lines and get cross-point
densities A and B.
(4) Get the slopes of the lines.
Calculate the slopes of the straight lines as follows to determine K1, K2, and K3.
K
1
= d / a
K
2
= e / b
K
3
= f / c
●
Defaults are set as : A = 0.60, B = 1.00, K1 = 1.00, K2 = 1.00, K3 = 1.00
Example of set values (Fig. 10.6.l)
A = 0.6 (%), B = 1.0 (%)
K 1 = 0.8 / 0.6 = 1.33
、
K 2 = 0.4 / 0.4 = 1.00
、
K 3 = 0.3 / 0.5 = 0.6
10.6.2 Linearizer setting
(1) Switching to the setting mode (see Subsection 5.2.5)
First of all, press the [ESC] key of the converter several times (normally once although this
varies with the operation status) to return to the initial menu display. Next, use the [
→
] key to
move the LCD indicator cursor to the menu number "2" of "2 SETTING MENU" and then
press the [SET] key to display the warning message saying "Test output will be valid.". Make
sure that there is no problem and then press [
→
] to get into the setting mode. And return to [2:
SETTING MENU]. Then, the output will be switched to the simulated output that is set
beforehand.
(2) Selecting the linearizer menu (see Subsection 5.2.5)
Initially, the menu list of the menu numbers 5 to 8 is displayed. Press the [UP] key to switch to
the menu list display of the menu numbers 9 to 11. Use the [
→
] key to move the cursor of the
LCD indicator to the menu number "9" of "9: LINEARIZ/CNDUCTVTY" and then press the
[SET] key to select the menu of "9: LINEARIZ/CNDUCTVTY".