Lindorm, Inc.
Lindorm, Inc.
"Sedimeter sensors designed and
built by Lindorm are a fantastic
tool for measuring water column
turbidity and siltation." (Gravity)
SM3 system
SediMeter™ instrument and accessories
SediMeter™ specifications

Sensor Cleaner None Mechanical Vibrator UV+Vibrator UV+Mechanical UV+Vibrator
Length 700 mm 760 mm 730 mm 730 mm 770 mm 750 mm
Mass 140 g 380 g + 230 g shuttle 145 g ca 150 g ca 390 g + 230 g shuttle ca 170 g
Diameter 15 mm 15 mm sensor
20 mm house
60 mm shuttle
15 mm 15 mm 15 mm lower part
20 mm upper part
60 mm shuttle
20 mm
Recheargable Battery 300 mAh 1800 mAh 300 mAh 300 mAh 1800 mAh 1800 mAh
Battery Duration (typical) 3...12 months 1 year w 50 cleanings 2 weeks w 5000 cleanings TBD TBD TBD
Connector Top end Bottom end Top end Top end Bottom end Top end
SediMeter OBS Array 36 OBS detectors 1 cm apart measuring 36 straight backscatter and 35 oblique backscatter turbidity values, for a 35 cm long profile with 5 mm resolution, used both for the turbidity profile and for the bottom level estimate
Turbidity Sensors (above the OBS array) One identical to the SediMeter array OBS, measuring straight backscatter in 945 nm (NIR), mounted 11 cm higher up (unit: FBU) One ISO-style nephelometric turbidimeter measuring 90º scattered 850 nm light (unit: FNU)
One EPA-style nephelometric turbidimeter measuring 90º scattered white light (unit: NTU)
Accelerometer N/A 3-axis accelerometer for determining instrument tilt; can optionally be used as motion detector, for recording seismic vibrations, etc.
Auxiliary sensors Temperature; battery voltage
Data Output
Bottom Level Resolution 0.01 mm, detection threshold 0.1 mm, linearity 1 mm, total range 35 cm, at least 30 cm of which have the stated linearity
Turbidity Profile 35 cm range, 5 mm vertical resolution, 1 FTU intensity resolution, range to over 10,000 FTU, composed of 36 straight backscatter (FBU) and 35 oblique scatter (FNU) measurements in 945 nm NIR
Turbidity Optical backscatter detector, units FBU (945 nm) ISO 7027-style, units FNU (850 nm NIR, 90º scatter)
U.S. EPA-style, units NTU (white light, 90º scatter)
Tilt, Acceleration N/A 3-axis instantaneous gravity for tilt determination
Temperature Resolution 0.01°C, accuracy ±0.5°C, time constant 100 s
Battery voltage Resolution 1 mV
Measurement interval Up to 24 hours, any value set in hh:mm:ss
Memory 16,384 measurements TBD
Burst samples Up to 20, with 1 to 16 seconds interval TBD
Burst channels Bottom level, backscatter turbidity (OBS #37) TBD (turbidity and accelerometer are contemplated)
Computer interface RS-485 (a.k.a. RS485, TIA-485)
Baud rates 9600 baud; 115,200 baud (9600,N,8,1 after RESET)
Network Daisy-chained cables, or SediLink radio modems
Protocol LogDator Communication Protocol ver. 3.0
Input voltage range 5 V ≤ Usupply ≤ 15 V
Battery charge time Ca 5 hours Ca 1 hour Ca 5 hours
User Interface LEDs
Power Connected Blue
Battery Yellow for charging, green for full Red for charging, green for full
Communication Yellow for listening, green for transmitting Yellow for receiving, green for transmitting
Measurements Red blink after each measurement White blink of turbidimeter doubles as indicator
Control Using PC software and USB cable; Reset magnet
Kit Accessories (where applicable)
Mounting hardware Anchor, holder tube or rod, and handle to screw it down
Cable USB to SediMeter cable, 1.8 m standard length
Blind plug Protects UW connector when used stand-alone
Software SediMeter.exe for Windows, for instrument set-up, download, data display, and real-time monitoring of one or many instruments (additional hardware required for network operation)
Depth rating Pressure tested to 45 m
Ambient light Each OBS must be submerged 10 cm to filter out daylight
Temperature From 0ºC to 50ºC, not exposed to direct sunlight
Optical liquid medium SIlicon oil, non flammable
Counterweight Made of lead (the EU RoHS directive has an exception for counterweights)
RoHS No Yes

More Information

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We reserve the right to change specifications and prices without notice, and do not assumte responsibility for typos or other inadvertent errors, or slight variations in dimensions, weights, etc. The turbidimeter accuracy of 10% is inherited from the accuracy of the Formazin calibration standard. NWIS PCODE = 63682 (FBU), 63680 (FNU), and 63684 (FNMU).

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