Sequoia LISST-PORTABLE XR, Manual

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LISST-Portable|XR manual 31
What liquids can I use for
suspending my particles? Use ONLY water (fresh or salt water), ethanol or isopropanol (isopropyl alcohol) or non-corrosive
oils for suspending particles!
Use of solvents such as acetone, toluene etc. for suspending particles will permanently
damage the instrument and void the warranty!!
Does the instrument detect
different types of particles? Regardless of the type of suspended particles, the LISST-P
ORTABLE
|XR will measure the size
and volume concentration of the particles. However, it cannot discriminate different types of
particles (e.g. quartz and feldspar; organic and inorganic) from each other.
What is the volume of the
mixing chamber? When the mixing chamber is filled to the top with the lid in place it contains 117 ml.
What are the units for the
concentration
measurements? The units for the concentration are in terms of particle volume per unit volume of liquid
– micro-
liters / l or µl/l.
Can I convert volume
concentration or mass
concentration to ppm
(parts-per-million)?
Yes. If you are looking for ppm by VOLUME, then the volume concentration in µl/l is equivalent to
ppm by VOLUME. If your ppm is by MASS, then you must convert the volume concentration to
mass concentration (see above) with units of mg/l. The units of mg/l are equivalent to ppm by
MASS.
What is the operating range
of the instrument in terms
of optical transmission? The operating range of the LISST-P
ORTABLE
|XR in terms of optical transmission is 75-95%.
Above 95% transmission the data will become increasingly noisy. Below 75% optical
transmission the data will become increasingly influenced by multiple scattering and you may end
up ‘inventing’ fine particles.
Do you have a question not answered here? Try the FAQ webpage on our website
(
http://www.SequoiaSci.com/faq/?SectionName=faq )! Otherwise contact us; see the front of this manual for detailed contact
information.