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6 F 8 A 0 5 2 1
6.4 Zero Calibration
All the density meters are calibrated for zero point [zero point phase ( θ
temperature (T
) ] at the time of shipment and parameters are set correctly. You do not need to
0
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. And return to [2: SETTING MENU].
Then, the output will be switched to the simulated output that is set beforehand.
(2) Stopping the flow in the pipeline
If it is allowed to stop the flow in the pipeline where the detector 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 of the pipeline where the detector is installed to discharge the fluid.
(5) Open the zero water feed port
Open the valve or remove the cap to feed zero water.
◆ When you open the zero water feed port, make sure that the pressure of the fluid in the pipeline
where density meter is installed becomes zero before opening the port. Any remaining pressure
will cause the measured matter to be spurted out. Be careful about this.
(6) Close the drain valve
(7) Supplying zero water
Put zero water (such as tap water) in the pipeline where the density meter is installed through the
zero water supply port by using a vinyl hose.
60
) and zero point water
1
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