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If Xmax is greater than the upper density measurement range, the function of automatic adjustment of
phase angle rotations is applicable. Therefore, return the function of automatic adjustment of phase
angle rotations which is set to "OFF" in Subsection 9.3.6 to"ON".
If Xmax is smaller than the upper density measurement range, the function of automatic adjustment of
phase angle rotations is invalid. Therefore, it is unnecessary to return the function of automatic
adjustment of phase angle rotations which is set to "OFF" in Subsection 9.3.6 to "ON".
9.3.8
Return to the normal through manual input of the phase angle rotations
If the function of automatic adjustment of phase angle rotations is not applicable whereas the piping
system (where the density meter is installed) is temporarily made empty thus causing the number of
phase angle rotations to jump to a faulty number, the number of phase angle rotations fails to return to
an appropriate value even when the piping system (where the density meter is installed) is refilled with
the matter to be measured, thus allowing the measured density to remain in error. In this connection, it is
necessary to reset the phase angle rotation to an appropriate value through manual input. The setting
method is described below.
(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. To get into [2: SETTING MENU], it is
necessary to further enter the password "8000". Then, the output will be switched to the
simulated output that is set beforehand.
(2) Selecting the "ANGLE ROTATION" setting menu (see Subsection 5.2.5)
In the state that the menu list of menu numbers 5 to 8 is displayed, use the [→] key to move the
LCD indicator cursor to the menu number "8" of "8: ANGLE ROTATION" and then press the
[SET] key to select the menu of "8: ANGLE ROTATION".
(3) Verifying or changing the number of phase angle rotations (see Subsection 5.2.13)
Press the [DN] key once (or the [UP] key twice) to display "N: ROTATION". On this screen, it is
possible to verify the number of phase angle rotations. Here, press the [SET] key to switch to the
setup display of the number of phase angle rotations and enter an appropriate value (note). At the
initial digit, use the [UP] or [DN] key to select whether to attach the "-" symbol or not. Use the
[→] key to move to the digit, and use the [UP] or [DN] key to alter the numeric value of the
relevant digit. When entering input is completed, press the [SET] key to confirm it. The screen
will be returned to the immediately preceding one; make sure that the value is correctly reset.
Note: In many cases, an appropriate value for the number of phase angle rotations N is 0. In the
event that the density or the fluid temperature is high, this value may be 1. In the event that
the density or the fluid temperature is low, it may be -1. Set either of 0, 1 and -1 and then
verify that the measured density at this time has returned to an appropriate value.
(4) Returning to the measuring mode
Press the [ESC] key twice to return to the initial menu screen and return to the measuring mode
from the setting mode to resume the normal measurement.
80
6 F 8 A 0 7 8 7
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