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6.4 Zero Calibration
All the density meters are calibrated for zero point [zero point phase ( θ
(T
), and atmospheric temperature (A
0
do not need to calibrate the meter for zero point before using it at site.
In the case of the density readings are found to be way off from the result by manual analysis, or when
you need to read just the zero point for a particular reason, follow the procedures below in calibrating
the zero.
For information on the converter operation and the LCD display regarding zero-point calibration, please
refer to Subsection 5.2.11.
(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) Stop the flow in or out from the tank and in the piping system.
If it is possible to stop the flow in or out from the tank and in the piping system where the density
meter is installed, do so by, for example, turning off the pump.
● If it is not allowed to stop the fluid flow through the pipeline:
When it is not permitted to stop the flow of the line, bypass the flow by opening the valve on
the bypass pipe.
◆ It is recommended that the bypass piping be installed for adjustment/maintenance
purposes such as zero calibration in the event that the flow in the pipe line cannot be
stopped.
(3) Close the upstream valve and downstream valve
Close the shutoff valves on both sides of the detector tightly.
Note: Be sure to close the upstream valve first.
◆ In the event that the density meter is installed on the discharge side of the pump, make
sure to shut the valves starting from the upstream one to prevent the fluid pressure in
the density meter from rising.
(4) Drain the detector pipe
Open the drain valve on the pipeline to discharge the fluid from the main pipe of the detector.
(5) Open the zero water feed port
Open the valve or remove the cap to feed zero water.
◆ Make sure that the pressure of the fluid in the detector gets low enough to let the valve
open without causing blow out of the fluid. Any remaining pressure will cause the
measured matter to be spurted out. Be careful about this.
(6) Close the drain valve
) ] at the time of shipment and parameters are set correctly. You
0
60
6 F 8 A 0 7 8 7
) zero point liquid temperature
1
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