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    SDI-12 Submersible Depth Sensor | Level & Temperature | Pa993D

    SDI-12 Output, Fully Submersible, Very Compact Ø23mm and Surge Protected
    Submersible Depth Sensor
    Lead Time
    2 weeks
    Prices From
    (excl. VAT)
    Quantity, OEM & educational discounts
    3D CAD models available

    At a Glance

    • Ranges:0-1mWG up to 0-100mWG
    • 23mm Diameter
    • Output: SDI-12 v1.4
    • Environmental Protection: IP68 to 100 metres
    • Accuracy: <±0.15%/FS (Optional 0.1% and 0.06% Versions)
    • Low Power Consumption: <4mA
    • Compact Only 23mm Diameter
    • Accurate Level & Temperature Readings
    • Fully Submersible & Long-Term Immersion Protected to 100m 
    • Intelligent 16-Bit Electronics for Complex Calibrations
    • High Integrity Waterproof Assembly
    • Robust Stainless Steel Silicon Sensing Element
    • Protected Against Power Surges from Lightning Strikes


    The Pa993D SDI-12 submersible depth sensor is an intelligent microprocessor enhanced depth sensor designed for both level and temperature readings as standard.   With its narrow diameter of just 23mm, it is ideal for V-notch weir flow measurement in open channel flow applications and environmental monitoring.

    Thanks to its embedded 16-bit microprocessor-based electronics, the Pa993D SDI-12 submersible depth sensor can perform complex linearisation, temperature compensation and calibration to deliver extremely high accuracy of less than ±0.15% full scale, with an option to increase this to 0.1% or 0.06% if required, making them ideal for laboratory & research testing applications, environmental monitoring and flood defence systems.

    The Pa993 is perfect for applications using battery or solar panels as it has a very low power consumption and can be powered from as low as 6V supply.  Plus, it is extremely useful in multi-sensor setups as one or more SDI-12 submersible depth sensors can be used to interface with one datalogger.

    They have a robust 316 stainless steel silicon sensing element coupled with a choice of Nitrile (NBR) or Viton (FKM), guaranteeing long term immersion protection to 100 metres.  In addition, their moulded cable exit fitted with vented polyurethane (PUR) cable and strain wire provide a high integrity waterproof assembly as standard, making them ideal for the measurement of pressure within rivers, reservoirs and boreholes.

    The Pa993D SDI-12 submersible depth sensor has a surge protection circuit to mitigate the effects of electrical transients caused by nearby lightning strikes and power supply fluctuations.

    If you need to connect this sensor to a PC, try our USB-SDI12 converter. Using the free downloadable logging software, you can data log up to 10 SDI-12 sensors connected to the USB-SDI12 converter to a PC/Laptop.

    Applied Measurements are proud members of the SDI-12 support group, a non-profit corporation who provide SDI-12 specification and additional information about SDI-12.

    Technical Specifications

    Pressure Ranges:1, 2.5, 3.5, 5, 10, 20, 25, 50, 75, 100metres Water Gauge (mWG) *
    Pressure Reference:Gauge (Sealed Gauge + Absolute optional)
    Safe Overpressure:150% Pressure Range
    Burst Pressure:300% Pressure Range
    Supply Voltage:6-36Volts DC
    Current Consumption:<0.25 (idle), <4 (when active)mA
    Digital Output:SDI-12 v1.4
    Electrical Connections:Screened polyurethane (PUR) cable with vent tube, strain and drain wire
    Level Accuracy:<0.15 (0.1% or 0.06% optional)±%Pressure Range
    Temperature Accuracy0.5±%/FS
    Temperature Resolution0.01˚C
    Temperature Range Operating:-10 to +60 (non-freezing media only)˚C
    Temperature Range Compensated:20 ± 20˚C
    Temperature Effect on Output:<0.01 typical±%/˚C
    Temperature Effect On Zero:<0.01 typical±%/Rated Output/˚C
    Long Term Stability:<0.1±%/FS
    Environmental Protection:IP68 to 100mWG (10bar)
    Weight:300 (sensor), 48g/metre (cable)grams
    Construction / Wetted Parts:316 St/Steel, Viton (EPDM + NBR optional) + PUR
    Permissible Media:All fluids compatible with wetted parts.
    Electrical Protection:EMC Immunity: EN50082-1 & Surge (Lightning) Protection: EN61000-4-5
    Reverse Polarity Protection:No damage but no function.
    *Other engineering units selectable in software: mm, inches, feet, mbar.

    Product Dimensions

    Pa993D SDI Outline

    Wiring Details

    Red+ve supply
    Blue-ve supply
    YellowSDI-12 output
    Whiteto case
    Green/Yellowcable screen

    Ordering Codes & Options

    Pa993DA-10mWG-AAAV-01-000 (example code)Pa993DA-10mWG-AAAV-01-000
    Product Family
    Electrical Output
    A = SDI-12 v.1.4A
    Pressure Range
    10mWG = 0 to 10 metres of water gauge (H2O)-10mWG
    10mWA = 0 to 10 metres of water absolute (H2O)-10mWA
    10mWSG = 0 to 10 metres of water sealed gauge (H2O)-10mWSG
    Accuracy (Non-Linearity & Hysteresis)
    A = <±0.15%/FS-A
    B = <±0.1%/FS-B
    C = <±0.06%/FS-C
    Process Connection
    A = Nose Cone (G1/4” DIN 3852 male when removed)A
    Housing Material
    A = 316 Stainless SteelA
    O-Ring Material
    V = Viton (FKM)V
    N = Nitrile (NBR)N
    Cable Length (in metres)
    01 = 1 metre-01
    10 = 10 metres-10
    Specials Code
    000 = No Special Requirements-000


    CAD Model Files

    Our 3D models are provided in STEP format and can be viewed using FreeCAD. Other formats can be provided on request.

    The .zip file below contains a separate model for each product variant.

    Interested in this product? Send us an enquiry...

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