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SDI-12 Shaft Encoder 56-0540


SDI-12 Shaft Encoder 56-0540

    • Revolves one rotation of the 5/16 in. input shaft into 400 increments
    • Low power (less than 2.5mA from a 12VDC supply @ 2.5 rev/sec)
    • Uses solid state, low power optical sensor technology Low starting torque (less than 0.25 ounce/inch)
    • Surge protected
    • Externally accessible, internal back-up battery. Can use standard AA battery.
    • Accepts commands and returns data in the industry standard SDI-12 format, allowing it to interface with dataloggers that have SDI-12 communications ports such as the Xpert Datalogger
    • User selectable resolution.
    • User specified scaling (Does not require specific circumference wheel).
    • User selectable direction for increasing counts (CW or CCW).
    • 32 bit resolution counter.
    • Range limited by SDI-12 to 7 digits. With 2 decimal place resolution, +99999.99. With 3 decimal place resolution, +9999.999.
    • Programmable rate of change tracking. Factory default 2.5 rev/sec.
    • Built-in 2 line by 8 character LCD display with backlight
    • Internal back-up battery voltage readable via SDI-12
    • Excessive shaft speed indicated on display.
    • Display turned on by depressing “DISPLAY” button
    • Display is continuously update with current value.
    • Communications interfaces: SDI-12, SDI-12 protocol over RS-485, RS-232
    • Double bearing design to support up to 10 lbs on the shaft.
    • Groundwater monitoring
    • Gate position indicator


    File Name Revision Number Release Date File Size Description
    SDI-12 Shaft Encoder Datasheet
    Sep 28, 2016 146.68KB


    File Name Revision Number Release Date File Size Description
    SDI-12 Shaft Encoder O&M Manual
    B Apr 3, 2014 445.48KB


    File Name Revision Number Release Date File Size Description
    SDR PC
    3.3.6 Nov 14, 2017 775.55KB
    Change notes:
    SDR Pocket PC
    3.3.6 Nov 14, 2017 397.94KB
    Change notes:

    Tender Specifications

    File Name Revision Number Release Date File Size Description
    SDI-12 Shaft Encoder Tender Specifications
    Jan 19, 2015 15.63KB

    Parameters Specifications
    • Input Voltage
    7 to 16 VDC over voltage and reverse voltage protected
    • Power Consumption
    • Starting Torque
    < 0.25 inch-ounce
    • Shaft Diameter
    5/16 inch with both threads and a flat
    • Rotation Resolution
    400 count per revolution
    • Counter Resolution
    32 bit
    • Reported Resolution
    User selectable Range 7 decimal digits (examples: ±99999.99 or ±9999.999)
    • Display
    2 line, 8 character per line with backlight Backup Battery AA size, 1.5V or 3.6V accepted
    • Bearing Supports
    Double bearing arrangement supports up to 10 lb. shaft load
    • Supported Wheels
    User specifies wheel size – no required circumference
    • Support Units
    User specified
    • Rotation Speed
    User specified – factory default 2.5 rev/s
    • Maximum Rotation Speed
    5 rev/s
    • Temperature Range
    -40ºC to +60ºC (Display viewable -20ºC to +60ºC)
    • Communication Interfaces
    SDI-12, RS-232, SDI-12 protocol over RS-485 (on -DT unit)
    • SDI-12 Support
    V1.3 – will work with V1.0, V1.1, V1.2, and V1.3 dataloggers

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