WL16 Water Level Logger

Price$1,346.00 (US Only)



In Stock 0 - Available for Backorder

Accurate and reliable datalogger and pressure transducer combination designed for remote monitoring and recording of water level and pressure data in groundwater pumping and sludge tests, stormwater flood analysis, and run-off, as well as surface water irrigation canals, streams, and river gauging.

For temperature, the WL-T Temperature Output Option AN0000 is needed for WL16 Water Level Logger.

  • Overview

    The WL16 Water Level Logger is a datalogger and submersible pressure transducer combination designed to remotely monitor and record water level, pressure data, and/or temperature (item AN0000 required). The water level logger can record over 81,000 readings and has four unique recording options, fast (10 samples per second), programmable interval (1 second to multiple years), logarithmic, and exception. Multiple depth ranges are available from 3 to 500 feet of water level change.

    Key Features:

    • Four sample modes: 10 times per second, timed, logarithmic, and exception
    • Highly accurate water level measurements
    • User-programmable start and stop alarms, engineering units, and field calibration setup
    • Wet-wet transducer eliminates vent tube concerns.
    • Automatic barometric pressure and temperature compensation
    • Well-built to support depths of 3ft to 500 ft
    • Can measure level and temperature

    The WL16, Water Level Logger, is housed in a weather-resistant cylindrical enclosure, slips inside a standard 2-inch PVC pipe. The Water Level Recorders are easily adapted with standard hardware for wellhead mounting, stream, or other installations.  Two internal 9 VDC Alkaline batteries will typically power each of the Water Level Loggers for approximately one year, even if one of the batteries fails. A third onboard lithium battery ensures your data is safe in the event both 9V batteries fail. All Water Level Loggers include Windows and PDA software, allowing easy data upload on a laptop, desktop, or PDA for transfer to spreadsheet programs.

    The vented submersible pressure transducer uses a unique silicon diaphragm to interface between your water and the sensing element. The diaphragm is highly flexible and touches the sensing element, producing a sensor with exceptional linearity and low hysteresis. A stainless steel micro-screen cap protects the pressure transducer diaphragm. The micro-screen cap has hundreds of openings, making fouling the sensor with silt, mud, or sludge virtually impossible.

  • Specifications
    Certifications CE
    Connectivity / Communications USB Type B
    Data Management

    Storage Capacity:  81,759 time and date stamped data points (including battery voltage) Data Overwrite:  Select memory wrap or unwrap (unwrap will stop logging data once memory is full)

    Memory Non-volatile flash memory
    Operating Temperature -40° to +185°F (-40° to +85°C)
    Power Two 9VDC Alkaline Batteries

    12 bit

    Sampling High Speed (10 samples per second), Fixed Interval (Programmable from 1 sec to >1 year), Logarithmic, Exception

    Enclosure:  1-7/8 inch dia. x 11-1/2 inch length (4.8 cm dia. x 29.2 cm length) (fits inside a 2 inch well), stainless steel UV protected PVC vented for barometric pressure compensation  Weight:  1.6 lbs (0.7 kg) (with battery and 25 ft cable)

    WL16 Water Level Data Loggers  
    Power Two 9VDC Alkaline Batteries
    Battery Life

    Up to 1 year (depending on recording intervals)

    Resolution 12 bit
    Moisture Protection

    Protective coating (helps prevent damage to electronics from condensation)


    -40° to +185°F (-40° to +85°C)

    Humidity 0-95% non-condensing


    Non-volatile flash memory

    Storage Capacity

    81,759 time and date stamped data points (including battery voltage)

    Sample Modes High Speed (10 samples per second), Fixed Interval (Programmable from 1 sec to >1 year), Logarithmic, Exception
    Data Overwrite  Select memory wrap or unwrap (unwrap will stop logging data once memory is full)
    Clock Synchronizes to the time and date of user's computer
    Clock Accuracy 0.0025% or 1 minute in 1 month
    Clock Format Month/Day/Year Hour/Minute/Second
    Enclosure 1-7/8 inch dia. x 11-1/2 inch length (4.8 cm dia. x 29.2 cm length) (fits inside a 2 inch well), stainless steel UV protected PVC vented for barometric pressure compensation
    Weight 1.6 lbs (0.7 kg) (with battery and 25 ft cable)
    Communication Port      WL16U: USB Type B
         Selectable Baud Rates:
    Certificates CE compliant
    Global Water Level Loggers Software  
    Compatibility Microsoft's Windows 98, ME, 2000, NT, XP, Vista, and 7


         Tabular Display/Printout; data in standard spreadsheet format (CSV)
         Programmable alarm start and stop times
         Field calibration software and help files included

    Water Level Logger Vented Cable  
    Conductors 4 each 22 AWG

    Marine grade polyether jacket, polyethylene vent tube, full foil shield

    Shield Aluminum Mylar
    Outside Diameter

    0.306 inch (0.78 cm)

    Temperature Range

    -22° to +185°F (-30° to +85°C)

    Length Standard 25 ft (7.62 m) (up to 2000 ft (609.6 m) from factory) (for cable lengths over 500 ft (152.4 m) please call for availability)
    Submersible Pressure Transducer  
    Sensor Element Silicone Diaphragm, Wet/Wet Transducer
    WaterLevel Measuring Range

    0-3, 15, 30, 60, 120, 250, 500 ft

    Linearity and Hysteresis ±0.1% FS
    Warm-Up Time

    3 seconds recommended


    Not to exceed 2 x full scale range

    Accuracy ±0.1% of full scale at constant temperature, ±0.2% over 35°F to 70°F (1.37° to 21.1°C) range

    Uses dynamic temperature compensation 30 to 70°F (-1.1 to 21.1°C). Automatic barometric pressure compensation


    Up to 13/16" diameter x 5-1/2" long (2 cm dia. x 14 cm long)(small enough for a 1" well)

    Material 304L Stainless Steel, SS microscreen (hundreds of holes to prevent fouling), electronics are fully encapsulated in marine grade epoxy, guaranteed not to leak
  • Accessories
  • FAQs

    What are the best applications for the WL16?

    • Ideal for static level water monitoring and water depths in rivers, streams, groundwater, coastal, and other surface water applications.
    • Depth monitoring for wells and/or sludge testing.
    • Water elevation monitoring between different sites.
    • For monitoring water level usage within industrial plants.

    What makes the WL16 different from other YSI water level instruments?

    • The WL16 is one of the only pressure transducers to include its own data logger.
    • It utilizes analog outputs instead of digital outputs.
    • It can record temperature and level simultaneously
    • It comes equipped with a silicon diaphragm, unlike the WL450 which utilizes a stainless steel or Titanium diaphragm

    How do I set up the WL16 and does it work with Windows 10?

    Yes, the WL16 works with Windows 10 and is factory calibrated and ready for use upon arrival.

    When you have received your WL16 install the software and utilize the general configuration tab to configure your sample time. Additional information can be found in the general tab of the user manual.

    How often does the sensor read?

    That is configured by your personal settings during general configuration.

    How do I gather my data and measurements?

    The WL16 is connected to your personal computer or laptop via USB and all information can be transferred thru excel for easy viewing.

    How is the WL16 calibrated? And is it certified?

    The WL16 is calibrated at the YSI facility and gets a quality certification upon shipment.

    What are the typical power requirements and battery life?

    The WL16 is powered by (2) replaceable 9V batteries with the unit requiring at least 12 volts of power, and can generally be in field service use 6 to 7 months before having to change batteries.

    How often do I need to calibrate the equipment in the field?

    We recommend once a year if possible.

    How do I field calibrate my equipment?

    Pictures and steps can be found in the WL16 Manual

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