Hach-Lange SURFACE SCATTER 7 sc Turbidimeter - Manual (Page 43)

41
Maintenance
5. Wipe the replacement lamp clean to remove any dust and
fingerprints. Fingerprints left on the glass bulb can permanently
damage the lamp. Install the lamp in the light source block.
6. Slide the notched spacer over the lamp cable with the notch
away from the lamp base. Route the lamp cable through the
notches. Install the lamp and spacer into the end of the housing
with the spacer notch aligned with the notch in the housing.
7. Install the end plate using the two screws removed in step 3 .
8. Install the assembled light source assembly in the sample unit
using the two screws removed in step 2 . Connect the lamp
cable connector.
9. Using the alignment template supplied with the turbidimeter,
verify that the light source assembly is positioned properly
as follows:
a. Be sure the lamp door is closed tightly. Apply power to the
sc100 controller. Wait for the display to show the current
turbidity reading before continuing.
b. Install the calibration cylinder in the top of the turbidimeter
body ( Figure 16 on page 33 ).
c. Place the alignment template on top of the calibration
cylinder with the guide pin down and against the flat notch
on the inside of the cylinder (
Figure 18 ). The back edge of
the template should be against the sample unit back plate.
d. Check the position of the lamp image on the alignment
template surface. It should fall on the target area so the
center of the beam is centered between the lines
(
Figure 18 ).
e. If the light source assembly needs adjustment, loosen the
two mounting screws enough to adjust the position of the
lamp image. Tighten when aligned properly.
10. Calibrate the instrument as described in section 5.5 on
page 31 .