Operation - Toshiba LQ300A00 Series Operation Manual

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.
[NOTE]
◆ In the event that the measured matter does not flow continuously or the interior of the detector is
temporarily left empty due to the intermittent operation of the shifting pump to the tank or the piping
system on which the tank or the piping system (where the density meter is installed) is installed,
perform the external synchronized operation described in Section 6.7.
◆ When the flow in the pipe has stopped, solid matters may subside 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 some fluid escapes from the pipe and thus the tank or the piping system (where the
density meter is installed) is not completely full of the measured matter, the density measured value
turns out to be erroneous (such as full-scale excess; shift 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.
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