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Welcome to the

LISST-25X Suspended Sediment Sensor

Technical Specifications of the LISST-25X

•

Parameters Measured

-Particle Volume Concentration (µ/l)
-Sauter Mean Diameter (SMD)
-Optical Transmission
-Depth (meters)

•

Optical Path

-2.5 cm optical path with 0.1% resolution

•

Operating Range

-Concentration: Approximately 0.1 to 1,000 mg/l with 30 micron

(limits change linearly with particle size)

-Size Range: 1.25-250 µm (Type B), or

2.50-500 µm (Type C)

-Transmission: 0 – 100%
(optimal range for measuring concentration and SMD: 30-98%)

•

Data Storage

-28,000 recordings of measured parameters

•

Power Supply

-Internal 4 x 9V alkaline batteries
-External 6-12V DC @ 250 ma maximum

•

Physical Dimensions

-3.5” diameter x 18” long (8.0 cm diameter x 45 cm L)
-8.0 lbs (3.6 kg) in air
-2.0 lbs (0.9 kg) in water

•

Depth Rating

-300 meters



This document is the property of SEQUOIA SCIENTIFIC, INC. It shall not be reproduced, disclosed, used

in whole or part, for any purpose, without the specific written authorization of SEQUOIA SCIENTIFIC, INC.

Содержание LISST-25X

Страница 1: ...Operating Manual Version 1 0 2700 Richards Road Bellevue WA 98005 Tel 425 641 0944 Fax 425 643 0595 LISST 25X Suspended Sediment Sensor...

Страница 2: ...1 25 250 m Type B or 2 50 500 m Type C Transmission 0 100 optimal range for measuring concentration and SMD 30 98 Data Storage 28 000 recordings of measured parameters Power Supply Internal 4 x 9V alk...

Страница 3: ...g a maximum of 5 mW of visible red light at a wavelength of 670nm The laser beam under normal circumstances is not a threat However if objects are placed in the path of the laser beam the light could...

Страница 4: ...Email keir sequoiasci com Tel 425 641 0944 ext 104...

Страница 5: ...ttom samples at the site of interest to calibrate their sensors This calibration will provide a constant that produces a linear response to concentration However the problem with this approach is that...

Страница 6: ...side this range will cause measurement errors An extremely heavy concentration of particles causes a condition called multiple scattering Multiple scattering arises when scattered light from particles...

Страница 7: ...hite plastic instrument stands and set them on a flat working surface Remove the LISST 25X from its case and set it on the stands The LISST 25X has two distinct ends that are referred to as the Optics...

Страница 8: ...oper communication port is selected These settings are accessed by choosing the Settings option of the File menu Clicking on the Serial Port tab will display the current settings The LISST 25X is ship...

Страница 9: ...aterial to the water to take actual measurements of suspended solids Add the material and make sure it is well mixed At the prompt enter GX The date and time total volume mean size and optical transmi...

Страница 10: ...e connector endcap will light This can be very useful in visually confirming that the instrument continues operating before deployment Step 12 Download stored data The batch file will continue until S...

Страница 11: ...Note Because the LISST 25X has data for two size classes the plots of the data will not be displayed correctly A new version of the software designed specifically for the LISST 25X will be available...

Страница 12: ...ll appear Select the Save values as Default box to store the setting for future use Step 16 Print Preview and Print data Select Print Preview from the File menu to display a preview of the page to be...

Страница 13: ...lace batteries The batteries are mounted to a card To replace the batteries remove the card by lifting on the white levers The card should slide out Replace the four 9 volt batteries and re insert the...

Страница 14: ...een LED on the endcap can be used to see if the instrument is still running as programmed Step 8 Recover the instrument Upon recovery rinse and dry the area around the connector endcap Reconnect the C...

Страница 15: ...mmunications baud rate to x where x 300 600 1200 3400 4800 9600 19200 or 38400 SC x Set Calibration Constant equal to x SF x Set output format where x sample code SM x Set output display mode to x cod...

Страница 16: ...ory EB Exit Batch file GT x Goto batch command line x x 1 to 25 LB xx cmd Load batch command line x with cmd string x 01 to 25 Note command line must be two digits RP x ER Repeat code between RP and E...

Страница 17: ...amount of available memory can be accessed by the DM command The amount of available memory is then displayed The units will be in number of samples Example input DM output Memory available 28103 samp...

Страница 18: ...scription Returns all settings to startup defaults Does not effect datafile batch file or clock A warning prompt will ask you if you are sure you want to reset to defaults Enter Y or y followed by a e...

Страница 19: ...nput SB 9600 output The baud rate is now set to 9600 Note The output message is printed at original baud rate before it is changed to the new rate Cautions Resetting the baud rate does not effect the...

Страница 20: ...or power up See Also DT Display Time command Example input ST 01 05 2001 21 05 03 Cautions The clock resets to 12 00 am 1 1 80 upon powering up Acquisition Action commands GR Grab and store samples as...

Страница 21: ...sample Syntax XS or xs Description Transmits the last acquired averaged sample to the screen in the same format as the GX command The sample will be from the last GR GS or GX command Example Input XS...

Страница 22: ...p Cautions The background scattering data and other settings are not affected by the ZZ command Batch File Commands BP Print batch file to screen Syntax BP or bp Description Prints the current batch f...

Страница 23: ...ommand line x with cmd string x 1 to 25 Syntax LB x command or lb x command Description Loads batch file memory with desired command Example Input LB 01 GR 100 Output Batch file 1 GR 100 Cautions Batc...

Страница 24: ...seconds The WE 0 command is only executed once The during the loop the previous WE 300 command is used to reset the timer for the next WE 300 command Cautions If the wait time specified has already el...

Страница 25: ...ze_sub 63 micron Range Sauter Mean Diameter 1000 Depth depth in meters 100 The values are stored in the following order using the specified number of bytes Date 4 bytes Time 4 bytes Vol 4 bytes Size 4...

Страница 26: ...Window 6 After a Reset the parameters will return to default values These include the time date samples per average and calibration constant The internal pointers to the data storage memory are also a...

Страница 27: ...mples per average will also need to be reset to desired values The background scatter data will be reset to factory default values Therefore a new background must be recorded 11 After setting the para...

Страница 28: ...the later of one 1 year after SEQUOIA s delivery of the original Product or 90 days after SEQUOIA s delivery of the repaired or replacement Product Any Product component part or other item replaced b...

Страница 29: ...tware No title to or ownership of any software or intellectual property rights are transferred to Customer 10 U S Government Restricted Rights Notice All software data technical information and writte...

Страница 30: ...andard commands To download the data choose Xmodem Offload from the TattleTale menu A window will appear showing the number of bytes store in memory and the number of bytes to offload By default the n...

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