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Sequoia LISST-200X User Manual
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Sequoia LISST-200X User Manual

Path reduction module
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LISST-200X
Path Reduction
Module
User's Manual
Version 1.1
(November 2018)
2700 Richards Road, Suite 107
Bellevue, WA 98005-4200
Tel: (425) 641-0944 Fax: (425) 643-0595

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Summary of Contents for Sequoia LISST-200X

  • Page 1 LISST-200X Path Reduction Module User’s Manual Version 1.1 (November 2018) 2700 Richards Road, Suite 107 Bellevue, WA 98005-4200 Tel: (425) 641-0944 Fax: (425) 643-0595...

  • Page 3: Table Of Contents

    Removing the PRM ......................6 Maintaining the LISST-200X Path Reduction Module ............ 7 Technical assistance For technical assistance please contact your local Distributor or Sequoia. Please be sure to include the type of battery pack with any correspondence. Sequoia Scientific, Inc. contact information:...

  • Page 5: Overview Of Lisst-200X Path Reduction Module

    Overview of LISST-200X Path Reduction Module The LISST-200X has been designed to cover a wide range of concentrations of particles. However, when the concentrations are high the light scattering from the particles can included multiple scattering which will affect the measurement of particle size and concentration.

  • Page 6: Installing The Path Reduction Module (Prm)

    Installing the Path Reduction Module (PRM) The PRM for the LISST-200X consists of a highly polished quartz cylinder and mounting hardware. The quartz cylinder is press against the smaller transmit windows with a small drop of highly filtered water. The plastic holder and spacers hold the quartz cylinder in place during deployments.
  • Page 7 PRM mostly installed. water background, as described in the next step. • Check the Clean Water Background using the standard procedure described in the LISST-200X User’s Guide. The results should be close to the factory values. However, they may not receive a PASS result because of the instrument being in air.

  • Page 8: Background Collection And Software Configuration

    A clean water background must be collected with the PRM in place. Open the Collect Background window and select the PRM checkbox. Proceed to collect and save a new background using the Standard procedure described in the LISST-200X User’s Guide. Clean water background collected with PRM installed.
  • Page 9 • When processing a data file collected with the PRM installed, a message will appear in the data preprocessing window. This indicates the data are being processed assuming a reduced path length. Data processed using the correct path length. LISST-200X Path Reduction Module User’s Manual Page 5...

  • Page 10: Removing The Prm

    LISST-200X. STEP ACTION RESULT • Clean the LISST-200X optics head and PRM components to remove any large debris that could scratch the glass windows or cylinder when the PRM is removed. • It may be necessary to remove any hard growth, such LISST-200X and PRM as barnacles, before removing the PRM.

  • Page 11: Maintaining The Lisst-200X Path Reduction Module

    PRM components to fully clean them. STEP ACTION RESULT • Remove the PRM from the LISST-200X and clean the PRM clean, ready for assembly as much as possible. use or storage. Note: Full disassembly of the PRM is not usually required and not recommended unless absolutely necessary.
  • Page 12 • Reattach the PRM Plugs using the two screws to keep all parts together. PRM re-assembled and • Wrap the optics with protective soft tissue and store ready for storage or the assembly in a safe place. use. LISST-200X Path Reduction Module User’s Manual Page 8...