Validation & Calibration
Page 38 of 111
6. Refit the wiper unit loosely. Observe the displayed value at the Turbidity analyzer.
7. If the displayed value is near 0.0 NTU (i.e. +/- max.2 NTU), the validation at Zero point
is successful. Please repeat steps 2-7 but use standard 40 NTU and then 10 NTU to
complete the validations. The display value shall be near the value of the standard used
(i.e. +/- max.2 NTU). When the validation is completed, please jump to the step 24.
8. If the displayed value has drifted more than +/- 2 NTU a cleaning and/or a calibration
is needed.
9. For Calibration: Make sure that the measuring chamber is clean and filled with standard
0.0 NTU. DO NOT FILL COMPLETELY.
10. On the Turbidity Analyzer: Press followed by x 2.
11. Press to select Formazine STD.
12. Press to begin Zero Calibration – observe “Calibrating Zero”.
Note: Pressing the again will skip the zero calibration.
13. After approximately 1 minute the text “Fill Span Sol.” indicates a successful zero
calibration and the system is ready for Span calibration.
14. Loosen the union nut on the top – remove the wiper – park it.
15. Turn VALVE 2 from STOP to DRAIN and back to STOP again when draining is done.
16. Pour Standard 40 NTU into the chamber. DO NOT FILL COMPLETELY.
17. Refit the wiper unit loosely.
18. Use the ↑ and ↓ keys to adjust the value to 40 NTU. Press the to confirm.
Note: Pressing the again will skip the span calibration.
19. After approximately 1 minute the text “CAL. Complete” indicates a successful span
calibration. Press until the turbidity value is displayed.
20. Loosen the union nut on the top – remove the wiper – park it.
21. Turn VALVE 2 for the WM unit (and the internal valve for the WMRTU) to DRAIN
and back to STOP when draining is done.
22. Pour Standard 10 NTU into the chamber. DO NOT FILL COMPLETELY.
23. Refit the wiper unit and tighten the union nut and observe a 10 NTU value on the
display.
24. If the displayed value is within +/- 2 NTU, the calibration is successful.
25. Drain the sensor & tighten the union nut by hand.
26. Turn internal valves to RUN.
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