Operation - Toshiba LQ500 Operation Manual

6 F 8 A 0 5 2 1

6.6 Operation

(1) Startup (see Subsection 5.2.5)
When the power is turned ON, the menu setup is automatically changed to the measuring mode
(the state of "1: MONITORING MENU"), thus starting the density measurement. If the meter is in
setting mode (the state of "2:SETTING MENU"), the density measurement operation is started by
pressing the [ESC] key several times (varying between one to three times depending on the
operation status) and thus pulling the menu setup out of the setting mode.
◆ In the event that the external synchronized operation is selected, the menu setup is changed to
the measuring mode and the external contact input signal is turned ON, thus starting the density
measurement after the specified delayed time has elapsed.
(2) Executing the measurement
Executes the density measurement while updating the output values (density current output value;
LED density display; LCD density display on the monitor menu) approximately every second.
(3) Suspending the measurement (see Subsection 5.2.5)
When stopping the measurement, select "2: SETTING MENU" from the initial menu list to get into
the setting mode. Once in the setting mode, the density measurement will be suspended and the
output will be switched to the simulated value that was set beforehand.
◆ In the event that the external synchronized operation is selected, the density measurement is
suspended if the external contact input signal is turned OFF even in the measuring mode. For
details including the output when the density measurement is suspended, refer to Section 6.7.
◆ In the event the fluid does not flow continuously in the pipeline where the density meter
[NOTE]
is installed or the pipeline is temporarily left empty due to the intermittent operation of the
shifting pump, perform the external synchronized operation described in Section 6.7.
◆ When the flow in the pipeline is stopped, solid matters may settle down or float causing
the density in the pipe to lose its uniformity, which in turn may cause the density measured
value to gradually rise or fall. In addition, if the fluid drains out from the pipeline, the
pipeline where the density meter is installed is not completely filled with the fluid, the
density measured value turns out to be erroneous (such as exceeding the full-scale range;
shifting to the minus side; major marginal error). However, this does not mean that the
density meter has failed. Even to avoid such a phenomenon, it is necessary to perform the
external synchronized operation.
 64 