ABB 4690 User Manual page 27

4690 Series
Turbidity systems
Continued from previous page
Return to
top of page
IM/4690–EN Rev. A
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
key. The display changes to Calibrating Span.
4. Press the
Note. If span calibration is not required, press the
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
formazine span solution.
Advance to
Access to Configuration
keys, set the display to the NTU value of the formazine span solution.
Fill Span Solution
pages – see Section 8.1, page 26.
key again to advance to Cal.
parameter is set to the NTU value of the
7 Calibration
25