Global Water FC220 Open Channel Flow Monitor

Global Water's FC220 Open Channel Flow Monitor is a reliable and accurate instrument for measuring and totalizing open channel flows for all flumes and weirs, as well as for any gravity-type open channel flow application.


  • Easy-to-use interface with user selectable flow tables
  • Accepts any 4-20mA water level sensor's input
  • 4-20mA output for interface to data logger or PLC
List Price $1,502.00
Stock More On The Way   
Global Water's FC220 Open Channel Flow Monitor is a reliable and accurate instrument for measuring and totalizing open channel flows for all flumes and weirs, as well as for any gravity-type open-channel flow application. The flow meter measures water depth using any 4-20mA water level sensor's output including Global Water's highly accurate submersible pressure transducer or ultrasonic water level sensor. The flow meter's powerful microprocessor instantly calculates and displays water flow and totalizer values in user-selectable units using one of several water flow calculation modes. The Open Channel Flow Monitors have an 8-button keypad that easily guides the user through the setup menus.

Open Channel Flows
For any open channel that is free flowing, there is a specific relationship between depth of water and flow rate. Whenever a given depth occurs, there will always be the same water flow. Therefore, if the flow rate is known for each depth, a depth-to-flow relationship can be constructed. The Open Channel Flow Monitor supports a large number of different types of flow calculation modes. Over 40 pre-programmed flume and weir tables are included with the open channel flow meter. For monitoring in round pipes and open rectangular channels, the Manning's Equation mode allows the user to enter their own parameters for material, slope and pipe or channel dimensions. The open channel flow monitor also allows the user to define standard flow equations, which can calculate flow for almost all flumes and weirs. Another mode lets the user enter parameters for a best fit 3rd order polynomial, which is useful for calculating flow based on empirical data and lookup tables. A 16-character name can be programmed into the FC220 water flow meters by the user to identify the installation site or show other information about the configuration.

Level Measurement
Global Water's standard open channel flow monitors can measure flow depth with any 4-20mA water level sensor including the WL400 Water Level Sensor, which is a fully submersible pressure sensor constructed of stainless steel. Submersible pressure transducers should be mounted slightly below the "zero" flow depth of the open channel, upstream from the throat of the flume or weir. For open channels with no primary device, the sensor should be mounted below the lowest expected water depth. Global Water also offers a WL700 ultrasonic water level sensor that allows the Open Channel Flow Monitor to measure semi-solid flows or flows that are not suitable for a standard submersible pressure transducer. Global Water recommends that the ultrasonic sensor option only be used in areas where AC power is available. Because the open channel flow monitor accepts a 4-20mA input signal, it can be mounted up to 3000 feet away from the water level sensor.

Flow Monitor Display
The Open Channel Flow Monitor displays water flow with up to 7 digits, allowing for very large flows to be displayed. The totalizer records up to 9 digits of flow volume in non-volatile memory and is password-protected from reset. Available volume units are cubic feet, gallons, million gallons, cubic meters and liters; time units include seconds, minutes, hours and days. This allows the open channel flow meter to display flow in 20 different user-defined units. Water level is calibrated and displayed in feet, inches, meters or centimeters; a water level offset function allows the measured water level to be adjusted to compensate for variations in the sensor installation.

Flow Monitor Output
The FC200 Flow Monitor has four independent relay outputs for triggering external devices like water samplers and monitoring devices. The relays can be separately programmed to trigger based on volume per pulse, and threshold settings can be used to limit triggering to flows above preset levels. There is also an accurate and scalable 4-20mA output provided for monitoring the flow using data loggers and PLC devices. The flow monitor offers a programmable power-saving features that allow the supply current to be reduced for remote monitoring applications.
Questions & Answers
Does the FC220 require an external data logger?
The FC220 Open Channel Flow Monitor can be factory-fitted with an internal data logger which records a historical record of water flow, and records the exact time of each relay pulse.
How many sensors can be connected?
The FC220 can be connected to one water level sensor. This flow monitor also has 4 independently programmable relays for external devices such as data loggers or samplers.
What can the FC220 display?
The Global Water FC220 Flow Monitor can display real-time flow, water level, or total flow in the users-choice of units. Multiple flow calculation modes are available.
Did you find what you were looking for?

Select Options

  Products 0 Item Selected
Part #
Global Water FC220 Open Channel Flow Monitor
FC220 open channel flow monitor, AC power
More On The Way  
Global Water FC220 Open Channel Flow Monitor
FC220 open channel flow monitor, DC power
Check Availability  
Global Water FC220 Open Channel Flow Monitor
FC220 open channel flow monitor with USB data logger, AC power
Check Availability  
Global Water FC220 Open Channel Flow Monitor
FC220 open channel flow monitor with USB data logger, DC power
Check Availability  
  Accessories 0 Item Selected
Notice: At least 1 product is not available to purchase online
Multiple Products

have been added to your cart

There are items in your cart.

Cart Subtotal: $xxx.xx

Go to Checkout

In The News

Rounded pebbles give evidence of past flowing water on Mars

NASA's Curiosity rover has found pebbles that appear to have been rounded by streamflow, according to a release from University of California Davis. Experts say the finding represents the first on-site evidence of sustained flowing water on Mars. The rounded pebbles discovered are only known to form when transported through water over long distances. Their discovery supports theories that the red planet could once have supported life. The smooth rocks were found between the north rim of the planet’s Gale Crater and the base of Mount Sharp, a mountain inside the crater. Researchers say they chose Gale Crater for study because there was a sediment deposit there that typically requires water to form.

Read More

Study suggests small dams have more negative effects than large dams

A recent study suggests that small dams may have a greater impact on rivers than large dams, as they divert more water away from rivers, according to a press release from the American Geophysical Union. Researchers from Oregon State University studied China’s Nu River, which is home to a variety of dams in the river main stem and its tributaries.  In total, 31 small dams were evaluated and compared to four large dams in the main river stem. The research team compared dam impacts to habitat loss, river channel lengths, land affected and landslide risks among 14 total factors.  They found small dams had a greater negative impact in nine out of 14 categories. Small dams, used to divert water to hydropower stations, had some of the most profound impacts on rivers.

Read More

U. Delaware studying tidal flow, sediment movement in salt marshes

University of Delaware scientists are studying the impacts that rising sea levels might have on marsh ecosystems in the future, the University of Delaware has reported. Scientists predict that rising sea levels could convert marshes into intertidal flats. These conversions could drastically change land composition by stripping sediment from the land, which could alter water quality by exposing substantial quantities of sequestered carbon and pollutants. Researchers are monitoring the fluctuations of water flow and sediment concentrations in Delaware’s Brockonbridge Marsh.

Read More