4690 Series
Turbidity systems 7 Calibration
IM/4690–EN Rev. A 25
Continued from previous page
Fill Span Solution
1. Remove the dry standard
and place it in its storage container.
Note. Do not touch the light reflecting parts of the standard.
2. Fill the flow chamber with the formazine span solution and refit the wiper unit or wiper plug.
3. Using the and keys, set the display to the NTU value of the formazine span solution.
4. Press the key. The display changes to Calibrating Span.
Note. If span calibration is not required, press the key again to advance to Cal.
Complete.
Calibrating Span
After approximately one minute, the display changes to Cal. Complete if calibration is successful.
1. Remove the wiper unit or wiper plug
.
2. Drain the flow chamber, ensuring all the formazine span solution is removed.
3. Refit the wiper unit or wiper plug
and open the inlet valve
.
If Cal Fail is displayed, drain the flow chamber, remove the wiper unit or wiper plug and clean the
emitter and receiver lenses. Repeat the calibration procedure ensuring that an in-date or fresh
formazine solution is used and that the Fill Span Solution parameter is set to the NTU value of the
formazine span solution.
Advance to
Access to Configuration pages – see Section 8.1, page 26.
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