Compressed air and nitrogen ultrasonic flow meter

Ultrasonic air flow meter

The FWD ultrasonic air flow meter measures flow rate of air or nitrogen gas

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.

THANKS TO THE ULTRASONIC COMPRESSED AIR FLOW METER:

Control the load of air compressors (medium and peak)
Detect and stop compressed air leaks
Measure your air consumption
Analyze your compressed air usage
Evaluate energy performance
Achieve energy savings
Reduce maintenance

Why measure your compressed airflow rate ?

Efficient use of energy helps control costs and reduce the negative impact on the environment.
In a factory, among the 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.

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. 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 flow velocity measurement. 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 sensors 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

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

Advantages of the ultrasonic air flow meter :

Easy, quick and economical installation - No wiring work with Lithium-ion battery powered version (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.

We are very pleased with the performance of this ultrasonic flow meter. It is easy to install and use, and it delivers measurement quickly, allowing us to identify the compressed air leakage and reduce our compressed air consumption.

Specifications:

Pipe diameter (mm)	DN25, DN32, DN40, DN50, DN65, DN80, DN100, DN150, DN200
Power supply	24 V DC ±10% or Built-in battery type (battery life : approx.10 years at 20˚C)
Power consumption	24 V DC, 1.5 W or less
Applicable fluids	Air (mainly air factory) or Nitrogen (25-80 mm diameter)
Temperature and humidity of fluid	10°C to 60°C, RH 90% or less
Working pressure	0 to 1 MPa (gauge pressure)
Range (actual flow rate) and accuracy	Diameter		Flow rate range (m³/h)	Accuracy
				±2.0% of flow rate	±5.0% of flow rate
	DN25		±0.6–35	±3.5–35 m³/h	±0.6–3.5 m³/h
	DN32		±1.1–65	±6.5–65 m³/h	±1.1–6.5 m³/h
	DN40		±1.3–80	±8–80 m³/h	±1.3–8 m³/h
	DN50		±2.5–150	±15–150 m³/h	±2.5-15m³/h
	DN65		±4–240	±24–240 m³/h	±4–24 m³/h
	DN80		±5–300	±30–300 m³/h	±5–30 m³/h
	DN100		±10–500	±50–500 m³/h	±10–50 m³/h
	DN150		±24–1200	±120–1200 m³/h	±24–120 m³/h
	DN200		±40–2000	±200–2000 m³/h	±40–200 m³/h
Air flow rate conversion accuracy	FWD 025–080 : ±2.5% or rate (at 500 kPa, 25°C, dry air) FWD 100–200 : ±2.0% or rate (at ≥ 300 kPa)
Display	Main display		Forward or forward/reverse mode : Ø25–Ø80 mm : Instantaneous flow rate (m³/h) 5-digit (4-digit for over 2000), Pressure (kPa) 5-digit, temperature (°C) 3-digit Ø100–Ø200 mm : Instantaneous flow rate (m³/h) 5-digit (4-digit for over 2000), Pressure (kPa) 5-digit, Temperature (°C) 3-digit
	Sub display		Ø25–Ø80 mm: Instantaneous flow rate (Nm³/h) 5-digit (4-digit for over 2000), Pressure (kPa) 5-digit, temperature (°C) 3-digit Ø100–Ø200 mm: Instantaneous flow rate (Nm³/h) 5-digit (4-digit for over 2000), Pressure (kPa) 4-digit, Temperature (°C) 3-digit
Output signal (not available for battery-driven version)	Current ouput		4–20 mA DC (±0.5% FS), maximum resistance load 400Ω, maximum output current 22 mA Instantaneous flow rate, velocity, pressure, or temperature measurement
	Contact output		2 open drain outputs, maximum load 24 V DC, 50 mA, maximum frequency : 10 Hz, Duty 35–65% Output 1: Unit pulse (forward), Output 2 : Unit pulse (reverse), Upper/lower alarm, device error
Process connection type	Ø25, Ø32 mm	Screwed type Ø25 mm : Rc1, Ø32 mm : Rc1-1/4
	Ø40–Ø80 mm	Wafer type (between JIS10K flanges)
	Ø100–Ø200 mm	Flange type JIS10K standard
Materials of wetted parts	Aluminum alloy, PPS, fluorosilicone rubber, etc.
Installation location	Indoor or outdoor (IP64 equivalent)
Storage temperature	-20°C to 70°C, non condensing