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SBS-3510 User’s Manual
Before you fill samples with unknown cleaning properties into the measuring
cell, always perform provisional cleaning experiments on a glass plate (e.g.
a microscopic slide). A sample should only be introduced into the density
measuring cell if it can be removed completely by rinsing (not wiping!) with a
suitable solvent.
Aqueous (polar) samples are best rinsed with polar liquids like water, alcohol
or acetone.
Organic samples (oils, fuels, lubricants, etc.) are best rinsed with organic
liquids (e.g. petroleum naphtha, petroleum ether, toluene, n-nonane).
Samples containing organic and aqueous components (like mayonnaise,
which contains oil and water) may have to be rinsed alternately with organic
and aqueous rinsing agents several times.
Samples containing protein (e.g. beer, milk) should never be brought into
contact with alcohol, because this can cause denaturation of the protein and
precipitation on the glass wall. Protein residues can build up when samples
like beer wort or grape juice are measured over a long time. Enzymatic lab
cleaners are usually best suited for removing these contaminants. We
recommend “Winepress Cleaner PM Membrane Presses”, cat. no. 409004,
by Wigol
®
or “TM Desana” by Thonhauser. Refer to the instructions of the
manufacturer concerning the concentration of the cleaning agent.
Strong alkaline lab cleaners (pH > 10.5) should only be applied briefly and at
temperatures below 25°C, because strong alkalis attack the glass surface
upon prolonged exposure and at high temperatures.
12.3 Cleaning the Filling Pump
Clean the filling pump regularly. Intervals depend on your application. If you
measure aggressive samples, e.g. battery acid, clean the filling pump more
often.
Dismounting the pump
1. Push the pump lever upwards with both thumbs (see fig. 9).
2. Release the pump by a quarter turn counterclockwise.
3. Pull out the pump.
