4
Converting the Surface Scatter
®
7 sc Turbidimeter to SS7 sc-HST
9. Install the vent cover on the top of the slant tube using the threaded disk and ¼-inch
screw. Tighten until snug.
10. Tighten the screws that hold the light source.
11. Check the alignment of the light source after installing the cover and readjust if
necessary, using the new alignment plate included in the kit. See the Surface
Scatter 7 sc Turbidimeter User Manual (Cat. No. DOC026.53.00769) for alignment
instructions.
12. Connect the elbow in the vent cover and the straight hose fitting in the PVC bulkhead
adapter with a section of ¾-in. hose. No clamps are required.
13. Screw the flow multiplier into the outside of the PVC bulkhead adapter as shown in
Figure 2.
14. Connect a filter/pressure regulator to the flow multiplier. (The filter/pressure regulator,
tubing, and tubing fittings are not provided in this kit.) The flow multiplier has a
1
/8-in.
NPT male fitting. A ¾-in. hose should be connected to the output of the flow multiplier
and routed to a suitable place to vent the fumes and/or condensate coming out of
the hose.
15. Set the pressure regulator to 20 psi initially. Adjust the flow up or down as needed.
16. The enclosed drain trap should be used to prevent air from being drawn in through the
drain. See Figure 2.
17. When reconnecting the hydraulics to the bottom of the unit, hold the ¾-in. bulkhead
fittings on the inside of the enclosure with the door open.
18. Replace the label displaying the part number and serial number of the sensor unit (not
the control unit) with the label enclosed in the upgrade kit. Thoroughly clean the
enclosure surface where the old label was attached and place the new label in the
same location. This identifies the product as a reconditioned product (for service and
compliance purposes).
19. Calibrate the instrument using the calibration cup as described in the user manual.
Operation
• 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 slant tube 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. Make sure
the cover sits flat on top of the slant tube when reinstalled.
• Calibrate the instrument using the calibration cup as described in the user manual.
Note: Do not operate the instrument without the cover.
Note: Do not operate the instrument unless the flow multiplier is also operating.
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