The WL16, Water Level Logger, is housed in a weather-resistant cylindrical enclosure, which 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 upload of data a laptop, desktop or PDA for transfer to spreadsheet programs.  NOTE: The Palm operating system is NOT supported. 

The WL16, Water Level Logger's vented submersible pressure transducer is fully encapsulated with marinegrade epoxy.  The electronics are encapsulated so that moisture can never leak in through O-ring seals or work its way into the vent tube and cause drift or sensor failure, as is the case with many other vented sensors.  The vent tube is sealed directly to the wet-wet sensing element, and any moisture that may enter the vent tube from the housing will only contact the ceramic parts, not the electronics.  Most federal agencies, universities, and environmental consultants recommend vented water level sensors for the best monitoring results.

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 very 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.

Water Level Recorders Specifications

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)
Temperature:  -40° to +185°F
Humidity:  0-95% non-condensing
Memory:  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" diameter x 11.5" length (fits inside a 2" well), stainless steel UV protected PVC vented for barometric pressure compensation
Weight:  1.6 lbs (with battery and 25' cable)
Communication Port: 
     WL16S: RS-232 4-pin circular connector
     WL16U: USB Type B
     Selectable Baud Rates:
     9600,19200,28800,38400,57600,115200
Certificates:  CE compliant

Global Water Level Loggers Software
Compatiblity:  Microsoft's Windows 98, ME, 2000, NT, and XP
Features: 
     Tabular Display/Printout; data in standard spreadsheet format (CSV)
     Programmable alarm start and stop times
     Field calibration software and help files included
PDA software:  CE and Mobile compatible. 

Water Level Logger Vented Cable
Conductors:  4 each 22 AWG
Material:  Marine grade polyurethane jacket, polyethylene vent tube, full foil shield
Shield:  Aluminum Mylar
Outside Diameter:  0.306"
Temperature Range:  -22° to +185°F
Length:  Standard 25' (up to 500' from factory)

Submersible Pressure Transducer
Sensor Element:  Silicone Diaphragm, Wet/Wet Transducer
Pressure Range:  0-3', 15', 30', 60', 120', 250', 500'
Linearity and Hysteresis:  ±0.1% FS
Warm-Up Time:  3 seconds recommended
Overpressure:  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 range
Compensation:  Uses dynamic temperature compensation 30-70 F. Automatic barometric pressure compensation

Housing:  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

Software Information

The Water Level Logger includes Global Water Datalogger Software, Windows-based software that provides many useful features, such as real-time readout, measurement interval and engineering unit selection, station ID setting, and sensor calibration.  The software makes accessing stored data and setting options easy.  Data downloaded from the Water Level Logger can easily be opened in any PC spreadsheet program for analysis and graphic presentation.  Globlal Water's Water Level Recorder Software will run on a PC-type laptop or desktop computer running Windows 98 or later.  To communicate with the Water Level Logger, a computer must be equipped with a communication port appropriate to the type of water level logger you have, either a standard RS232 serial or a USB host communication port.  Purchase of the Water Level Logger includes a RS232 or USB cable (for communication between the logger and your computer).

Installation Overview

The Water Level Logger's pressure sensor may be placed slightly below the lowest expected water level.  Level ranges of 0-3', 0-15', 0-30', 0-60', 0-120', 0-250', and 0-500' are available.  When ordering, select the level sensor range that will cover the maximum water level change (this is not necessarily the total depth of water).  Selecting the smallest water level range possible will ensure the greatest accuracy.

The Water Level Logger's data logger is housed in an enclosure that is designed to slip inside a 2-inch pipe and be completely hidden with a standard or locking well cap.  For monitoring groundwater, the water level recorders can be installed in a PVC pipe with the datalogger enclosure's rim resting on the pipe's edge.  For monitoring surface water, the water level loggers can be installed in a a protective stilling constructed of PVC pipe. 

Water Level Loggers Applications

Groundwater Monitoring, stream and river gauging, Lake/Pond Level Analysis, Flood Level Recording, Irrigation Canals, inflow and infiltration studies, Wetland/Estuary Monitoring, Weirs and Flumes, Wave and Tidal Analysis, and MUCH MORE...  NOTE: Polyurethane cable is not recommended for use with hydrocarbons or high concentrations of chlorine.  Please look at the our WL450 Water Level Transmitter to meet the requirements of these types of applications.