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Frequently Asked Questions
LISST |
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Q:
How do we deal with bio-fouling of optical windows ?
Q:
What type of batteries do the instruments use? Where can I get these batteries? How long can the batteries last ?
Q:
What is the effect of particle shape on the measurement ?
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How do the instruments work?
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Do I need to process my data differently when using an optical path reduction module (PRM)?
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What is in the .LOG file that I can create in real-time mode?
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I have a problem with my data and/or my data processing and would like you to have a look at them - can you do that? What data do I need to send to you?
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What is the acceptance angle of the LISST?
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Are there any instrument-specific files that I need in order to use my LISST-100/-100X?
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What is the upper and lower size range for each of the 32 bins of the LISST instruments?
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What is the InstrumentData.txt file and where can I find it?
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Is there a low velocity threshold for the LISST-SL? Does it need a minimum flow speed in order to sample? What is that?
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Can I program the LISST-SL and deploy it without the connection to the top side control box?
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How do I find a distributor?
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Where can I find information about scientific and/or applied research with the LISST instruments?
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I only need a LISST for a short time period - can I rent one?
Q:
I get an error message similar to this when trying to process my data in MATLAB: ??? Invalid MEX-file 'C:\matlab\lisst\factory_info\nlia.dll': C:\matlab\lisst\factory_info\nlia.dll is not a valid Win32 application. What am I doing wrong?
Q:
Can I get a raw data file (.DAT extension) from a file that I've collected in real-time mode?
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Can the LISSTs be used to measure the size and concentration of oil droplets in water?
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What is a USGS B-reel? What is it being used for?
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Is it possible to process multiple LISST-100X files at once? Can I do batch processing of LISST-100X files?
Q:
Where do I find the Volume Conversion Constant (VCC) for my LISST-100X?
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What kind of liquids are safe to use with my LISST instrument if I want to do laboratory work using the LISST-Portable or the test chambers that are available for the LISST-100/-100X/-25X?
Q:
What is a hologram?
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Why can't the LISST-HOLO be used when the flow speed is larger than 0.4 m/s?
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Why does it take 2 minutes to process one hologram?
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Is it possible to get data in real-time from the LISST-HOLO?
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Why doesn't the LISST instruments cover the submicron size ranges?
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Can the LISST-StreamSide handle freezing temperatures?
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Is there some recommendation for the pump flushing time when using the LISST-StreamSide?
Q:
What is scintillation?
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How many open-close cycles are the batteries in the BioBlock capable of?
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Does the BioBlock reduce the working life of the LISST batteries because it has to work more and send signals to the BioBlock?
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Does the BioBlock come into contact with the LISST windows either through the copper plates or some sort of wiper?
Q:
Does the BioBlock restrict the flow through the LISST compared to none fitted? And does this affect the readings of the LISST?
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Which way should BioBlock be mounted in relation to the flow i.e. facing 'upstream' or 'downstream' the prevailing flow?
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Should the zscat measurement be taken prior to fitting the BioBlock?
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Can I fit a BioBlock on all LISSTs?
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What is BioBlock?
Q:
When I try to program my LISST I get an error message: 'Could not find [Instrumentxxxx] section in LISST.INI'. What should I do?
Q:
I have just recovered my submersible LISST from a long deployment and now it is covered in algae and barnacles. How should I clean it?
Q:
Is Sequoia and the LISST instruments ISO certified?
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I need to ship a LISST back for service from within the US. Is there anything I should be aware of?
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I need to ship a LISST back to you for service from abroad. Is there anything I should be aware of?
Q:
What is the difference between the LISST-100 and the LISST-100X?
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What is the threading on the black cap that goes into the hole of the LISST-Portable lid? Is it a standard NPT threading size?
Q:
I have noticed differences between the battery voltage reported back by the 'DB' command given to our LISST-100X instrument and the battery voltages reported back by the query instrument function within LISST-SOP. Also, if measuring the voltage directly on the battery with a voltmeter I get a 3rd value. Why is that, and which one should I believe and/or use?
Q:
What is the minimum battery voltage that my LISST-100X will work with?
Q:
What is the default IP-address of the LISST-HOLO?
Q:
Can the LISST-100X or LISST-STX safely be unplugged from an external battery pack under water?
Q:
What is the noise in the output from the LISST ring detectors?
Q:
Does Sequoia manufacture mooring frames or tripods that I can buy for my LISST, in order to make it easier for me to deploy it?
Q:
How does the LISST measurement of suspended particles compare with transmissometers and other scattering sensors?
Q:
How does the LISST-ST measure size dependent settling velocity?
Q:
How does the LISST-25 instrument obtain a constant calibration measurement of total suspended volume concentration of particles?
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What is the Sauter Mean Diameter (SMD) measured by the LISST-25?
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What is size distribution?
Q:
Can the submersible LISST instruments do "range gating" similar to an acoustic sensor?
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Does the concentration estimate include particles bigger or smaller than the specified size range (1.25 - 250 micron)?
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What are some of the non-standard (custom) configurations made so far?
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Can I buy instruments outside the standard specifications (larger/smaller particle sizes)?
Q:
What is the maximum concentration that the instruments can work in? Why is the useful working range of the instruments specified in terms of optical transmission?
Q:
Why is the size range limited? Can it be expanded to cover a greater dynamic range?
Q:
Can I buy LISST instruments in the green wavelength?
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What is the range of measured sizes?
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Can the instruments be used in the profiling mode?
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Can I store data on the instrument and transmit data up a wire at the same time?
Q:
In the profiling mode how long a wire can I use for data communications?
Q:
Does daylight affect the measurement? How should I deal with it?
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Can I convert the LISST-100 to a LISST-ST and vice versa?
Q:
What is the maximum depth for a submersible LISST instrument?
Q:
How long can the back-up battery preserve my data?
Q:
Can the LISST instruments measure bubbles?
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What is the minimum measurable concentration of suspended material? What sets the limit?
Q:
Can I extend the operating limits by shortening or lengthening the optical path?
Q:
What happens when particles in a natural suspension are outside the measurement range?
Q:
What is the size resolution of the LISST instruments?
Q:
Can I specify a certain refractive index for my measurements of size distribution with the LISST-100?
Q:
Is there any effect of flow disturbance around the instrument?
Q:
Can the LISST-ST be used as a standard LISST-100 ?
Q:
Why does the LISST-ST report settling velocity in only 8 size classes, not 32 ?
Q:
Can LISST instruments be towed? How fast? Is there an effect of tow speed on the measurement?
Q:
What is the best orientation to use the instrument? In laboratory, field?
Q:
What type of mounting should I use ?
Q:
How can I get more than standard life out of the battery ?
Q:
Can I specify a certain refractive index for my measurements of size distribution with the LISST-25 ?
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Can I use a mix of refractive indices ?
Q:
What is the result if the scatterers are aggregates ?
Q:
What is the effect of particle index of refraction on the measurement ?
Sequoia visit to Colombia and Ecuador!
Sequoia's Yogi Agrawal and Ole Mikkelsen visited C'Particulas, Sequoia's Colombian distributor 28-30 November 2011. See the pictures on our facebook page!
Association Of Environmental & Engineering Geologists 54th Annual Meeting
Anchorage, AK, 19-23 September 2011, booth 31

CASQA 2011
Monterey, CA, 26-28 September 2011, booth 41


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