Hach-Lange SURFACE SCATTER 7 sc Turbidimeter - Manual (Page 40)

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Operation
5.7 Operating the SS7 sc-HST
• If condensation forms in the enclosure, increase the air
pressure (and flow) by increasing the air pressure setting of the
pressure regulator for the flow multiplier.
• Make sure the bubble trap is working. Bubbles on the surface
of the liquid will cause incorrect readings.
• If deposits accumulate inside the unit, wash the inside with
warm water spray.
• The vent cover at the top of the turbidimeter body ( Figure 6 on
page 14 , item 5 ) can be removed for cleaning if necessary.
Loosen the light source before removing the cover. Check the
alignment of the light after reinstalling the cover using the new
alignment plate included in the kit (
section 6.4.1 on page 40 ).
Make sure the cover sits flat on top of the slant tube
when installed.
• Calibrate the instrument using the calibration cup and formazin
as described in
section 5.5.2 on page 31 .
Note: Do not operate the instrument without the cover. Do not operate the
instrument if the flow multiplier is not working.