Ultrasonic flow measurement for air and nitrogen

Thanks to its innovative technology, the compressed air flow meter can monitor air consumption, identify leaks and adjust compressor parameters to optimize energy efficiency.

The FWD ultrasonic air flow meter measures flow rate of air

As an air flow sensor, it is ideal for the management of the operating load rate of compressors, the supervision of the compressed air consumption in factories and detection of air leakage in plants.

This mass flow meter for compressed air marks a real technological breakthrough in air flow measurement. It allows to highlight your compressed air consumption. Its objective is to make important energy savings by identifying the consuming networks and the compressed air leaks. With a flawless accuracy, this mass flow meter allows you to control and adjust the parameters of your air compressor.

with the ultrasonic compressed air flow meter

Thanks to the ultrasonic compressed air flow meter :

  1. Control the load of air compressors (medium and peak)
  2. Detect and stop compressed air leaks
  3. Measure your air consumption
  4. Analyze your compressed air usage
  5. Evaluate energy performance
  6. Achieve energy savings
  7. Reduce maintenance
save energy

Why measure your compressed airflow rate ?

why measure compressed air flow diagram

Efficient use of energy helps control costs and reduce the negative impact on the environment.
Among industrial utilities, compressed air represents up to 20% of the total energy budget of a factory. The need for this gas is one of the largest electrical consumption items, but the price of this energy can be controlled.

Flow meters are used in compressed air systems to provide a measure of flow rate through air velocity. Compressed air systems typically have high leakage rates, high start-up and shutdown times, and other problems that lead to losses and therefore waste. Industrial air flow meter can identify areas of excessive use and better manage the overall flow of the compressed air system.

Measuring, analyzing and communicating key plant performance indicators can then help educate personnel on efficient practices, thereby controlling costs, ensuring better equipment protection and saving money.

measurement analysis communication of performance indicators

Measuring principle: how to measure a compressed air flow rate ?

Fuji Electric's compressed air flow meters consist of two ultrasonic sensors installed on each side of the meter inlet and outlet

measurement principle how to measure compressed air flow

As the liquid flows, the ultrasonic waves propagate diagonally from the upstream sensor to the downstream sensor and back in the pipe where the mass flow meter is positioned.

With this technique, the waves are "carried" by the fluid, in the other, they are "braked".

It therefore takes a different time to pass from one sensor to the other. This difference is proportional to the velocity and therefore to the flow rate of the fluid.

This time difference allows to detect the fluid flow velocity and to calculate the volumetric flow rate according to the cross section of the flow meter and the Measuring principle - how to measure a compressed air flow rate FWD screenflow velocity measurement.

number of measuring points for compressed air flow meters

The number of measuring points of compressed air flow meters must be adapted to the size and use of the system. In contrast to thermal mass flow meters or vortex flow meters technologies, the FWD ultrasonic flow sensor technology does not clog and is highly resistant to oil-contaminated compressed air. It works even in the presence of water droplets (high dew point).

The combined measurement of flow rate, velocity, temperature and pressure, provides clear data on compressed air consumption and eliminates any uncertainty in the measurement.

Application of industrial ultrasonic mass flow meter for air flow measurement

ultrasonic mass flow meter applications

These air flow sensors are resistant to industrial environments and vibrations.
These air flow devices are ideal for companies operating in an industrial environment.

  • pharmaceutical 
  • glass
  • automotive
  • chemical
  • metal
  • food and beverages

As an instrumentation specialist, manufacturer of pressure transmitters and expert in gas analysis, our expertise extends to all industrial measurement solutions: pressure measurement, flow measurement, level measurement, temperature control, gas analysis and radiation monitoring.

Advantages of the ultrasonic air flow meter :

benefits of ultrasonic flow meters for compressed air

  • Easy, quick and economical installation - No wiring work with Lithium-ion battery powered Advantages of the ultrasonic air flow meterversion (10-year life span)
  • Low maintenance - No filter required. High resistance to contaminated fluids.
  • Clear viewing of compressed air and nitrogen consumption - Fast real-time measurement on large rotating LCD display
  • Early detection of air leaks - Large measurement dynamic and excellent repeatability
  • Measurement data you can trust - Mass flow meter for air (Build-in pressure and temperature compensation)
  • Maximum flexibility and wide range of applications - Bidirectional flow meter ultrasonic technology with no pressure loss
  • Build to last in harsh industrial environments - Robust and waterproof design
  • Many pipe diameters available - Available from DN25 to DN200
  • Easily adapts to all industrial airflow conversion formulas - Instantaneous flow rate can be converted into Nm3/h (flow rate at 0°C and 101.3 kPa atmospheric pressure) or standard m3/h (flow rate at user defined temperature and pressure).
  • Allows bi-directional measurement of compressed air flow - The FWD ultrasonic air flow sensor can measure the volume of air in a plant as well as the volume transferred between different plants.

screw-on model

Screw-on models ∅25 and 32mm

wafer model

Wafer models ∅40, 50, 65 and 80mm

model between flanges

Flange models
∅100, 150, and 200mm

Specifications :

Pipe diameter (mm) DN25, DN32, DN40, DN50, DN65, DN80, DN100, DN150, DN200
Supply voltage24 V DC ±10% or built-in battery type (battery life : approx.10 years at 20˚C)
Power consumption24 V DC, 1.5 W or less
Applicable fluidsAir (mainly factory air) or Nitrogen (25-80 mm diameter)
Fluid temperature10°C to 60°C, RH 90% or less
Working pressureLess than 1 MPa (gauge pressure)
Range (actual flow rate) and accuracyDiameterFlow rate range (m 3/h)Accuracy
±2.0% of flow rate±5.0% of flow rate
Air flow rate conversion accuracyFWD025-080: ±2.5% of reading (at 500 kPa, 25°C, dry air)
FWD100-200: ±2.0% of reading (at ≥ 300 kPa)
Display1st lineTotalized value (m3) 8-digit, Instantaneous flow (l/mm) 8-digit
2nd lineInstantaneous flow (Nm3/h) 5-digit (4-digit after 2000), Pressure (kPa) 5-digit, Temperature (°C) 3-digit
Output signal
(not available for battery-driven version)
Current output4-20 mA DCC (±0.5% PE), max. load resistance. 400Ω, max. current output 22 mA
Instantaneous flow, pressure, or temperature
Contact output2 contact outputs, max. load 24 V DC, 50 mA, max. frequency: 10 Hz,Output 1: pulses (forward), Output 2: pulses (reverse), high/low alarm, system error
Process connection type⌀25, ⌀32 mm⌀25 mm: Rc1, ⌀32 mm: Rc1-1/4
⌀40-⌀80 mmFlange mounting (JIS10K)
⌀100-⌀200 mmFlange mounting JIS10K
Process connection type⌀25, ⌀32 mm20D or more upstream, 5D or more downstream
When used for bidirectional measurement, 20D or more upstream and downstream
⌀40-⌀200 mm10D or more upstream, 5D or more downstream
When used for bidirectional measurement, 10D or more upstream and downstream
Materials of wetted partsAluminum alloy, PPS, fluorosilicone rubber, etc.
Installation locationIndoor or outdoor (IP64 equivalent)
Storage temperature-20°C to 70°C, non-condensing

Optimize your air and nitrogen flow with our flow meter designed specifically for you!