4690 Series
Turbidity systems 7 Calibration
24 IM/4690–EN Rev. A
7. Calibrate the sensor as follows:
Sensor Calibration
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or
Press to advance to next parameter.
Calibration Security Code
Enter the required calibration code number, between 00000 and 19999. If an incorrect value is
entered, access to calibration is prevented and the SENSOR CAL. page is displayed.
Dry Standard Calibration
Press the key to select Formazine Std.
Zero Calibration
Press the key. The display changes to Calibrating Zero.
Calibrating Zero
After approximately one minute, the display changes to Fill Span Sol. if zero calibration is
successful.
If Cal Fail is displayed, remove the dry standard and ensure the emitter and receiver lenses are
clean and dry. Refit the dry standard, ensuring it is fitted correctly (see step 6, page 22) and repeat
the procedure.
Note. Do not touch the light reflecting parts of the standard.
Continued on next page.
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