LISST-SL V2.1
User’s Guide
40
APPENDIX C: Cleaning the Optics
See also video:
15,16
After a deployment, connect a tygon tube to the sample intake fitting and flush
it with clean water. A funnel is included in the accessories kit. Fill it with water and with a
pinch clamp on the tygon tubing, capture a volume of water inside to keep the windows
wetted until a convenient time and place is available for cleaning.
Cleanliness of the optics can be determined by observing the ring values in the Background
Calibration function. Cleaning should be repeated until the ring values do not decrease any
further. Refer to Appendix D for a discussion on the acceptable quality of clean optics.
Set the LISST-SL on the instrument stands. Angle the SL so the nose is higher than the
nose (to prevent contamination from the pump cavity from flowing back onto the windows).
Drain out all water, rinse it with clean water. Attach a cleaning patch on the cleaning rod
using the tweezers provided. Wet the cleaning patch with the cleaning solution. Insert it into
the sampling tube. Rotate it and stroke it over the last 3 cm of travel. The windows are 32
cm from the end of the sampling tube. Some resistance can be felt as the patch is passing
between the windows. Repeat this procedure 3 or 4 times and rinse with clean water.
Replace the cleaning patches frequently.
To verify the cleanliness of the windows, check the View Rings function under the
Background Calibration (check the View Rings box on the lower left). This will be like a
normal calibration, but the View Rings screen will update after each sample. Since the
pump is running whenever the LISST-SL is in the Background Calibration mode, a large
clean water source or the copper tube loop including the 0.2 micron filter needs to be filled
and purged first.
If extensive cleaning is required, a pumping loop may help. Set up a circulating loop with an
external pump. Pump from a one liter volume container through the LISST-SL and returning
to the liter container. Add some cleaning solution or mild detergent to the water and let it
circulate for 15 to 30 minutes. Letting the solution foam and having lots of bubbles helps to
clean the windows. Even adding some sediment such as the AC Coarse will help. After this
cleaning, a thorough rinsing will be necessary again.
Water spots on the windows must be avoided. Do not leave water inside the LISST-SL to
dry out. Either leave it filled with water (for short periods of time) or if uncertain when it will
be used again, dry it out. Dry it out by draining the water through the tail. Leave the nose
slightly elevated. Canned air can be used to blow the inside dry from the sample tube end.
Check that the passage to the window is dry by inserting a clean patch on the cleaning rod.
The LISST-SL is now ready for long term storage.
Photo showing instrument ready for recirculation of slightly soapy water for cleaning
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