Records Water Flow and Temperature in Partially Filled Stormwater or Sewer Pipes, Flumes, or Weirs



  • Compact, self-powered and easy to use
  • No confined space entry required for sensor deployment
  • User friendly Windows and PDA software included
  • USB and Serial communication options available
  • PDA software simplifies field data collection
  • User programmable start and stop alarms, engineering units, and field calibration setup
  • Automatic barometric pressure and temperature compensation
  • Wet-wet transducer eliminates vent tube concerns

Water Flow Loggers Product Description

Global Water’s FL16 Water Flow Logger revolutionizes flow data collection for applications such as inflow & infiltration studies, stormwater and wastewater collection systems, open channels and a host of other gravity flow systems. The FL16 Water Flow Loggers will record over 81,000 depth, temperature, water flow and velocity readings in sewer and drainage pipes, as well as other open channel applications like flumes, weirs and square channels. The specially engineered, non-fouling water level sensor works in depths as little as ½ inch and allows for deployment in manholes and other difficult to access areas without the need to enter the confined space.

The FL16, Water Level Logger, supports USB cable interface for laptop and desktop data downloading …

The FL16 Water Flow Recorder’s vented water flow sensor is fully encapsulated with marinegrade epoxy. The water flow sensor’s 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 water flow sensors. The vent tube is sealed directly to the wet-wet sensing element, and any moisture that may enter the vent tube from the Water Flow Recorder’s housing will only contact the ceramic parts, not the electronics.

FL16 Water Flow Recorder’s user-friendly Windows-based software is tailored specifically for calculating water flows in partially filled sewer and drainage pipes using the Manning’s Equation, with pull-down menus for selecting and entering the necessary information. The Water Flow Recorder software has a unique calibration feature which allows users to view calculated water velocity, compare this to actual measured data, and adjust the water flow parameters to calibrate for the water flow conditions of a specific application. Water flow equations for over 40 standard flumes and weirs are provided, as well as user-definable custom lookup tables which can be used to convert water level to flow for virtually any application. Once configured, all setup and water flow parameters are stored in the Water Flow Recorder’s memory and are uploaded to the software automatically upon connection. This information can also be saved to a file for later use, allowing Water Flow Recorders to be deployed in multiple locations without the need to re-enter the water flow parameters each time the Water Flow Recorders are moved. The Water Flow Recorders operate on two standard 9 volt batteries, which they monitor so you are never caught off guard with dead batteries. A third onboard lithium battery ensures your data will be safe in the event you are unable to change the 9V batteries before they fail. An optional protective housing includes hardware for mounting the Water Flow Recorders to a manhole step or other structure and also allows for easy installation and replacement in the field.

Choose the FL16-U Water Flow Loggers for USB interface – best for direct to PC or laptop communication — or the FL16-S Water Flow Logger serial version, which is best for Windows CE or Mobile-based PDA’s.  NOTE: The Water Flow Loggers do NOT support the Palm operating system.  For more information on supported PDAs click HERE.  The FL16 Water Flow Logger package includes the weather-resistant water flow logger unit, non-fouling sensor with 25 feet of heavy duty cable and FL16-ACM software package.

…OR a serial communication port for use with most popular PDAs and telemetry solutions.

Bluetooth Capability
The AK1500 Bluetooth Adaptor was designed to eliminate the need for custom PDA cables to communicate between your PDA and the FL16 Water Flow Loggers.  The adaptor connects to the Water Flow Logger’s serial port using the same interface cable provided with the software-cable kit.  The interface operates from a single 9 volt battery and is turned on automatically when the cable connects the water flow logger and Bluetooth adapter.  Because the Bluetooth module consumes power when turned on, it is recommended that the cable be disconnected from the water flow logger when not in use.  A red LED shows the power status and is on continuously while the adaptor is plugged into the water flow logger.  There is also a blue LED that shows the status of the Bluetooth connection.

Water Flow Loggers Specifications

FL16 Water Flow Loggers
Memory:  Non-volatile flash memory
Power:  Two 9VDC Alkaline Batteries
Battery Life:  Up to 1 year (depending on recording intervals)
Resolution:  12 bit
Moisture Protection:  Silicon coating (prevents damage to electronics from condensation)
Temperature:  -40° to +185°F (-40° to +85°C)
Humidity:  0-95% non-condensing
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 (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: 
     FL16S: RS-232 4-pin circular connector
     FL16U: USB Type B
     Selectable Baud Rates:

Global Water Flow Loggers Software
Compatible with Microsoft’s Windows 98, ME, 2000, NT, XP, Vista, and 7
Windows and Excel are trademarks of the Microsoft Corporation
Tabular Display/Printout
Data in standard spreadsheet format (.CSV)
Programmable alarm start and stop times
Field calibration software and help files included

Water Flow Logger Vented Cable
Conductors:  4 each 22 AWG
Material:  Marine grade polyurethane jacket, HD polyethylene vent tube, full foil shield
Shield:  Aluminum Mylar
Outside Diameter:  0.307 inch (7.8mm)
Length:  Standard 25 ft (up to 500 ft from factory)
Temperature range:  -22 to 185°F (-30° to 85°C)
Weight:  0.7 oz/ft (65g/m)

Water Flow Sensor
Sensor Element:  Silicone Diaphragm, Wet/Wet Transducer
Level Range:  0-3 ft
Temperature Range:  32-122°F (0-50°C)
Linearity and Hysteresis:  ±0.1% FS
Level:  ±0.1% FS at constant temperature, ±0.2% over 32° to 70°F (0° to 21.1°C) range
Temperature:  Smaller of 0.5°F or ±1% of reading
Overpressure:  2 x full scale range
Burst Pressure:  10 x full scale range
Resolution:  Infinite (Analog)
Output Currents:
Level:  4-20mA ±1mA of full scale
Temperature:  0-10mA ±1mA full scale
Supply Voltage:  10-36VDC
Current Draw:  Combined level and temperature output currents
Warm Up Time:  3 seconds recommended
Operating Temperature:  0° (not frozen) to +185°F (-17.8° to 85°C)
Compensated Temperature Range:  32° to 70°F (0 to 21.1°C) submerged, automatic barometric compensation Housing:
Material:  316 Stainless Steel Outer Sleeve, PVC diffuser and strain relief
Size:  9 inch long x 1 inch dia. (22.9 cm long x 2.54 cm dia.)
Weight:  ~250g (9oz)

Format: Bluetooth 2.0 SPP (Serial Port Protocol)
Baud Rate: Auto Detect up to 115K Baud
Power: 9 V Alkaline, approx. 20 hours continuous use
Current: 30mA Average
Range: 20 Feet Maximum
Operating Temp: -40° to +185°F (-40° to +85°C)
Compatible Software: Global Logger II version 2.1.5 or higher
   Global Logger II PDA software version 2.0.1
   FL16 Flow Monitor version 2.3.2

Water Flow Recorder Software Information

The Water Flow Recorder includes Global Water Water Flow 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 Flow Recorder can easily be opened in any PC spreadsheet program for analysis and graphic presentation.  Globlal Water’s Water Flow Recorder Software will run on a PC-type laptop or desktop computer running Windows 98 or later.  To communicate with the Water Flow Recorder, a computer must be equipped with a communication port appropriate to the type of water flow recorder you have, either a standard RS232 serial or a USB host communication port.  Purchase of the Water Flow Recorder includes a RS232 or USB cable (for communication between the water flow recorder and your computer).

Water Flow Recorders Applications

Inflow and Infiltration, stream and river gauging, Stormwater Flow Monitoring, Wastewater Flow Calculations, Irrigation Canals, Weirs and Flumes, and MUCH MORE

Water Flow Recorders Options

FL16S  Water Flow Logger (PN# ASJ000)
SERIAL version for collecting data with most PDAs.  The FL16 Water Flow Logger package includes weather-resistant logger unit, non-fouling 0-3 ft sensor with 25 feet of heavy duty cable.

FL16S-ACM  Serial Water Flow Logger Software Kit (PN# ASJ050)
Includes software, manual, and serial interface cable.

F16U  Water Flow Logger (PN# ARJ000)
USB version for collecting data with most laptop/desktop computers.    The FL16 Water Flow Logger package includes weather-resistant logger unit, non-fouling 0-3 ft sensor with 25 feet of heavy duty cable.

FL16U-ACM  USB Water Flow Logger Software Kit (PN# ARJ050)
Includes software, manual, and USB interface cable.

WLEXE  Extra Water Level Logger Cable (PN# AE0000)
Cable length is measured from top of water level recorder to bottom of sensor.  FL16 includes 25 feet of cable, and extra cable can be added up to 500 feet.


Bluetooth External Adapter (PN# AK1500)

Bluetooth External Adapter

FLMNT  Protective Mounting Sleeve (PN# ASJ100)
2 inch capped PVC enclosure for easy mounting of Water Flow Recorder.



FC220 Open Channel Flow Monitor
Includes total and flow rate display with multiple relay outputs.

WL400 Water Level Sensor
When ordering, specify water level range that will cover the maximum water level change for your application (this is not necessarily the total depth of water): 0-3, 0-15, 0-30, 0-60, 0-120, 0-250, 0-500 ft.  Selecting the smallest water level range possible will ensure the greatest accuracy.  Includes 25 feet of cable.

WL430 Sewage Lift Station Wastewater Level Sensor
Includes 40 ft of cable

WL705 Ultrasonic Water Level Sensor
Specify Water Level Range: 3, 12, or 48 ft.  Includes 6 ft cable.