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Requires a sensor purchased separately, view options under the accessories tab or call 1-800-884-4967 to discuss.


  • 0 to ±32m/s (0 to ±105ft/s) flow velocity range
  • 0.5 to 236 inch pipe diameter range
  • -40 to 392°F (-40 to 200°C) fluid temp
  • ±1% accuracy
  • 1 second response time
  • USB port serial communication
  • Datalogging via SD memory card
  • Heat quantity measurement function
  • Digital signal processing
    • Improves anti-bubble characteristics
  • Sound velocity measuring function
    • Eliminates temperature and pressure errors
    • Enables easy setup for unknown materials
  • Compact and light-weight (just 2.3 lbs)
  • 4.7 inch color graphic display
  • 12 hour battery life

The Fuji Electric Portaflow-C FSC-3 Ultrasonic Flow Meter is a compact and light-weight flow meter, offering high performance and easy operation for the noninvasive measurement of flow rates in pipes.

Utilizing the latest electronics and digital signal processing technologies, the Portaflow-C offers high accuracy, quick response time, and outstanding anti-bubble characteristics. In addition to standard flow measurements, the Portaflow-C is capable of heat quantity measurement allowing simple management for heating and cooling applications.

The Portaflow can be used with various types of detectors applicable for small to large diameter pipe and low to high temperature. This flow meter is designed for 12 hours of continuous operation with its own built-in battery which is rechargeable in 3 hours with the supplied power adapter. An SD memory card allows flow, velocity and total data to be stored for later recall. A universal USB port permits communication with a PC to facilitate configuring the Portaflow-C as well as saving and reading data files, and a 4.7 inch color graphic display creates an easy-to-use operator interface.

The Portaflow-C applications include:

  • Flow measurement systems
  • Backup for an already installed flow meter system
  • Water supply and sewage treatment
  • Boiler-water / feed-water supplies
  • Cooling water or oil
  • Deionized water for semiconductor manufacturing

Transit Time Ultrasonic Flow Meters – Technology Explained

Transit Time ultrasonic flow meters are well-suited for relatively clean fluids with low to moderate aeration. These meters operate by comparing the time for an ultrasonic signal to travel with the flow (downstream) against the time for an ultrasonic signal to travel against the flow (upstream). The difference between these transit times is proportional to the flow, and the flow meter converts this information to flow rate and total. With this technology, the transducers are mounted on the outside of the pipe, providing tremendous advantages over more traditional and invasive flow measurement instruments such as magmeters, vortex meters, and turbine flow meters. These benefits include no system downtime for installation, no system contamination, no pressure drop, no moving parts, and no risk of leaks. This product is virtually maintenance free.

Required Transducers

At least one transducer is required for this product

Fuji Electric FSSD1 Transducer
12.6 inch rail for 0.5 to 4 inch pipes, -40 to 212°F, 2MHz, includes mounting straps and silicone grease
In Stock
Fuji Electric FSSC Transducer
21.26 inch rail for 2 to 48 inch pipes, -40 to 248°F, 1MHz, includes mounting straps and silicone grease
Fuji Electric FSSE Transducer
8 to 235 inch pipes, -40 to 175°F, 0.5MHz, includes 16ft signal cable, mounting straps and silicone grease
In Stock
Fuji Electric FSSH Transducer
19 inch rail for 2 to 16 inch pipes, -40 to 390°F, 2MHz, includes mounting straps and silicone grease
In Stock


Fuji Electric Sensor Cables
Pair of 16 foot cables with Lemo connectors on one end and BNC male connectors on the other
In Stock


Pelican Cases
Watertight, crushproof and dustproof cases for the ultimate in protection


Please consider these optional accessories.

Fuji Electric FSC Battery Pair
One pair of replacement batteries for Fuji's Portaflow-C ultrasonic flow meter
Sonic Coupling Compound
Acoustic couplant gel for use up to 400°F
In Stock
NIST-Traceable Calibration with Calibration Certificate
5-Point NIST-Traceable Calibration for clamp-on ultrasonic flow meters
FS-200 Ultrasonic Thickness Gauge
Hand-held ultrasonic pipe thickness meter with 5 MHz transducer
In Stock
Fuji Electric FSSD3 Transducer
21.26 inch rail for 0.5 to 12 inch pipes, -40 to 212°F, 2MHz, includes mounting straps and silicone grease
In Stock
Fuji Electric FSC Charger Revision 2
Charger for Versions 3 and 4
In Stock
FSC3 BTU Metering Kit
Energy meter for measurement applications based on flow and temperature differential for version 3 Portaflow ultrasonic flow meters

Application Notes

Here's how some of our customers used this product.

Campus HVAC Monitoring and Efficiency

The Background: Our customer is a university that wants to improve the efficiency of the hydronic heating and cooling systems in their dormitories.

The Problem: The hydronic heating and cooling systems were installed more than 30 years ago when not much attention was paid to energy efficiency. There’s now a push to get higher efficiency out of antiquated systems.

The Solution: The campus maintenance department already uses clamp-on ultrasonic meters to spot check flows in both cooling and heating water pipes as a means to see if the pumps are operating as expected. We recommend they upgrade to the Fuji Electric Portaflow-C which can interface with a BTU monitoring kit consisting of two RTD temperature sensors to measure the water temperature on both the supply side (T1) and return side (T2) of the boiler.

The temperature difference (T1 minus T2) equates to the energy lost in the form of heat to the building. This delta temperature when tabulated with the water flow rates indicates the use of energy over time. This allows the maintenance department to map and log the energy use over time to identify trends and problem areas, information that can be used to improve efficiency without shutting down or interfering with the system.

Troubleshooting De-ionized Water Pipeline Problems

The Background: Our customer is a semiconductor manufacturing facility with two identical pipelines transporting de-ionized water to identical machines. Though all things are equal, the performance of the two machines is not. The facility requires a means of finding the issue with the flow to the underperforming machine.

The Problem: The customer cannot simply shut down the production line to install traditional, inline water meters to locate the problem.

The Solution: We recommended a Fuji Electric Portaflow-C ultrasonic meter to locate the problem. The Portaflow-C can be quickly and easily clamped onto pipes without disrupting the flow or necessitating any modification to the pipe. Although the customer’s PLC showed that all appropriate valves were open, the Portaflow-C helped them determine that one of their valves was not operating correctly and was restricting flow. They were able to schedule a shut down for that one machine and replace the valve. The Portaflow-C is now used to spot check the customer’s other flow meters to ensure that they are reading correctly.