Toshiba Density (Consistency) Meter LQ500, Руководство по эксплуатации

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10.7 Density Multiplier Switching by External Signals
10.7.1 Density multiplier switching function by external signals
When switching around multiple measurement objects fulid of differing measurement sensitivities
to measure their respective sensitivities, it is possible to take appropriate density measurements by
resetting the density multiplier to a value in accordance with the relevant measured object fluid
each time the measured object fluid is changed. In the event that the measurement objects fluid are
limited to no more than four types, this function can be used to save the trouble of resetting the
density multiplier each time through manual input. Implement the span calibration in terms of each
measured object fluid in advance, obtain and set the respective density multipliers C1 to C4 and
then switch around the density multipliers to be used for density calculation by means of the
external voltage signals of two points in accordance with the measurement objects fluid being
switched around.
Table 10.7.1 shows the relationship between the statuses of external voltage signals and selected
density correction factors.
Table 10.7.1
Status of External Voltage Signal
DI2 DI3
Selected Density Multiplier
L L C1(Same as the normally used density multiplier C)
H L C2
L H C3
H H C4
H: Voltage signals of 20 to 30VDC
L: Signals of no more than 2VDC
10.7.2 Setting the density multiplier switching by external signals
(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 "OTHERS" setting menus (see Subsection 5.2.5)
Initially, the menu list of menu numbers 5 to 8 is displayed. However, by pressing the [UP] key,
this display is switched to the menu list of the next menu numbers 9 to 11. Use the [
→
] key to
move the LCD indicator cursor to the menu number "11" of "11: OTHERS" and then press the
[SET] key to select the menu of "11: OTHERS."
(3) Selecting of density multiplier switching ON/OFF(see Subsection 5.2.16)
Press the [UP] key once to display "DI: C CHANGE ON/OFF". Press the [SET] key here to
switch to the setup display. Each time the [UP] or [DN] key is pressed, the set value
alternates between "ON" and "OFF". Therefore, when using the function of density multiplier
switching by external signals, set the value to "ON" and then press the [SET] key to verify it.
The screen will be returned to the immediately preceding one; make sure that the value is