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< 7. Calibration >
7-8
IM 12E01B30-02EN 2nd Edition : June 09 , 2021-00
7.4 Slope calibration (Check tool)
When you calibrate both zero point and slope, first calibrate the zero point and then the
slope. See ■ ”Check Tool” to confirm about check tool.
[How to perform Slope calibration-Check tool]
1 Turn on the maintenance mode. Remove the top cover from the top of the detector. Loosen
the four screws fixing the clear cover and remove the clear cover.
2 Feed the zero turbidity water into the Flow cell to the level little higher than the measurement
window. Set the check tool and fix it with four screws.
3 Open the valve for zero turbidity water and run the zero water for five minutes. ( if no piping
is installed for the zero turbidity water, use the zero water filed in the Flow cell in the process
2 above, and you skip this process. In this case, make sure that there is no bubble adhered
on the surface of the check tool.)
4 Verify that the reading is stable, then shut the valve for supplying zero turbidity water.
5 Press on Main screen and go to the calibration menu.
6 On the calibration menu, select [Slope calibration (Check tool)] of turbidity manual
calibration.
7 Confirm the reading is stable. Press [check stability].
8 After the message pops saying the reading is stable, confirm that a value of the check tool is
correctly displayed. Then press [Next].
9 Check the result of calibration and press [Accept] to update the Slope of the calibration
parameter.
10 Remove the check tool and place the clear cover and the top cover on top of the detector. If
you finish the calibration, run the sample and turn off the maintenance mode.
7.5 Slope calibration (Standard solution)
If you perform both Zero and Slope calibration, perform Zero calibration first then do Span
calibration. Prepare a standard solution referring to “n Turbidity Standards”
1 Turn on the maintenance mode.
2 Press on Main screen and go to the calibration menu.
3 Select [Slope calibration (standard solution)] on the calibration menu.
4 Remove the top cover from the top of the detector. Loosen the four screws fixing the clear
cover and remove the clear cover.
5 Use a funnel and pour the standard solution down the side of the funnel into the Flow cell.
Fill the cell with the solution to a little higher level than the measurement window.
When the Flow cell is filled up to the level, drain the standard solution which has been
poured.
Pour slowly the standard solution for a second time down the side of the funnel again. Do
not allow bubbles enter the cell.
When the Flow cell is filled with the solution for the second time to the level which is a little
higher than that of the measurement window, put the top cover in place.
6 Confirm the reading is stable. Press [check stability].
7 After the message pops saying the reading is stable, enter the calibration value. Then press
[Next].
8 Check the result of calibration and press [Accept] to update the Slope of the calibration
parameter.
9 Drain the sample and clean the Flow cell with zero turbidity water. Place the clear cover and
the top cover on top of the detector. If you finish the calibration, run the sample and turn off
the maintenance mode.