Hach-Lange SURFACE SCATTER 7 sc Turbidimeter - Manual (Page 45)

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Maintenance
6.4.2 Light source assembly maintenance
No maintenance of the light source assembly is normally necessary
beyond changing the lamp. The lamp, several lenses, apertures
and other components are located in the light source housing. If
these components are removed for any reason, they must be
installed exactly as they were removed. Placing any of the
components in the wrong position or orientation can cause
measurement errors and lack of alignment.
Figure 19 illustrates the
correct installation and orientation of the components. If difficulty is
experienced in reassembly, contact Technical Support for
assistance. Refer to
Section 9 on page 53 .
Figure 18 Alignment details
1 Flat notch 6 Light source assembly
2 Alignment template 7 Mounting screws
3 Calibration cylinder 8 Target area
4 Turbidimeter body 9 Adjust light source to align light beam in target area
5 Install calibration cylinder and alignment template