Lindorm, Inc.
Lindorm, Inc.
SediMeter
SediMeter 20% Off in August
Swedish Innovations
for Sediment Research
SediMeter
SediMeter™ SM2A with optional light sensor. See in shop

SediMeter SM2A with optional light and pressure sensors. The backlight on the display can be turned off to save power.
SediMeter Model 2
The SediMeter kit comes in a watertight storage and transportation case with wheels.
SediMeter™ Model 2 specifications, firmware rev. 2

SM2 versions SM2A - all operating modes and features
SM2N - made for network slave operation
Physical
Dimensions 700 mm x 51 mm (27.6" x 2" - excluding finger screw)
Mass 0.5 kg (1 lb.)
Buoyancy in sea water Will lay down on the bottom
Depth rating 45 m (150') standard
Temperature From 0ºC to 50ºC, not exposed to direct sunlight
Sedimeter sensor
Active sensor length 350 mm (13.8")
Detectors per sensor 36 optical backscatter detectors (OBS)
Detector zoning 6 zones times 6 detectors (this increases the signal-to-noise ratio)
Detector spacing 10 mm
Turbidity resolution 1 FBU (formazin backscatter units, aka FTU)
Turbidity accuracy 6 FBU, estimated
Turbidity accuracy in holder 100 FBU, estimated
LED wavelength 945 nm
Visual indicator A white LED at the top of the sensor blinks once per measurement
PCODE 63682 (turbidity sensor classification in NWIS of USGS)
Other sensors
Built-in channels Temperature (cK, ±0.3 K), battery voltage (mV, ±0.1 V)
Optional sensors 2 channels with signal conditioning (e.g., light, pressure)
Logger
Modes Sleep, stand-alone logger, network slave, network master, USB-network adapter
Model LogDator™ LM-01-00/D, firmware rev. 2
A/D converter 12-bit resolution in hardware, 16-bit after anti-aliasing
Sedimeter channels 6 analog channels, one for each phototransistor zone
Sedimeter sampling Each LED lits up individually, measures background light and signal
Optional sensor sampling Bursts of 0 to 84 samples at 0.5 Hz to 50 Hz
Measurement interval User selectable from 1 second to 24 hours
Real-time clock UTC (GMT) by default, can be set to within 0.02 s
Data records 512-byte records that include metadata and 16-bit analog data
Analog data Stored in physical units for standard sensors, pressure, and light
Conversion and calibration Built-in calibration values, can be re-calibrated from software
Internal memory 2 MB (4096 records)
Memory cards SD and MMC cards up to 2 GB*
User interface NavPin control stick and 2 x 8 char LCD display*
Diver interface Magnetic switch for mode change and supervision of operation
Computer interface USB* and RS-485 (TIA-485 standard, 9600,N,8,1)
Network Up to 255 units per RS-485 cable
Network protocol LogDator Communication Protocol ver. 2.0
Power supply options 2 size AA Li batteries 2.1 Ah*, RS-485 cable, USB* (only for set-up and download)
Power backup Keeps settings for up to 30 minutes from 7.2 V
Power demand
Input voltage range 5.5 V < Usupply < 9 V during measurements, 3.5 V < Usupply < 9 V during communication
Minimum RAM retention voltage 1.8 V (lower voltages lead to a Reset)
Current use in idle, no card 34 μA in any mode (with USB disconnected)
Current use of memory card MMC and SD cards typically add some 50 μA when not in use
Current drain from supply Ipeak < 27 mA, Iaverage < 1 mA
Multiple power sources at once The one with the highest voltage is used (battery, USB, or RS-485 cable)
Version specific: Model SM2A
Supported features All those mentioned above
Version specific: Model SM2N
Supported features RS-485, 2 MB memory, network slave mode, cable power**
Unsupported features USB, user interface, memory cards, battery compartment
Underwater RS-485 connector 1 included, a second one optional
Power Supplied via the underwater RS-485 connector
Software "sedimeter.exe"
* Features marked with an asterisk only apply to certain models
** SM2N can be used as a stand-alone logger but to re-establish communication one has to reset it by cutting power for >30 minutes

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 inadvertet errors. Accuracy values refer to one standard deviation and are estimates unless otherwise noted.

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