Malvern

Sequoia Scientific and offer robust monitors for particle sizing in aquatic environments.

Sequoia Scientific are based in Seattle on the pacific coast of north America, in Washington state. They specialise in designing portable and submersible particle analysers - typified by the selection in the photograph.

The core product is the LISST-100x shown on the far right of the instruments. LISST-100x is a rugged, submersible unit that can be left underwater for months, passively collecting data on the size of particles suspended in that environment. The size range is 1.25 ~ 250 or 2.5~500 microns and the data is transferred to PC and software analysis when recovered to the surface. The LISST-Deep version can be lowered to 6000 metres!

Variants like the LISST-LX unit to the leftmost can measure settling velocities in 8 size classes in situ. The aerodynamically shaped LISST-SL is a self contained isokinetc sampling and sizing system for use in flowing streams and rivers; again it operates unattended under water and you collect data that has been stored.

The portable (yellow) box contains a self contained, battery operated particle sizer - dedicated to field use so that you can manually analyse size distributions of slurries or solid wastes or sediments or dirty water samples. The results are held in asci files for subsequent offload to PC and excel reporting's.

The other (Perspex) box is a fixed location monitor to facilitate upstream/downstream waters where you need to check on loads of contaminants or outfalls etc. Again it sizes the sediment loads for you and holds the data.

This page is under development, and to see all the Sequoia products and their sizing technology for environmental/aquatic testing,
please link to their web site www.sequoiascientific.com