Compressed Air Flow Meter, FL6440 Series

How it works
The Thermal Mass Flow Sensor attempts to achieve a given sensor temperature. As the media passes over the sensor the sensor is cooled. The amount of current needed to maintain the sensor temperature is measured and is proportional to the Flow Rate.
User Info
The FL6440 series is an inline thermal mass meter it is very simple to use and setup. Once fitted into your line via the screw connectors, you simply add power (24VDC) The FL6440 series will then give you a 4-20mA output for flow rate and total on the LCD.
Features and Benefits
No Moving Parts - reducing wear and tear and recalibration requirements
Glass-coated ceramic sensor - offers a high level of robustness and fast response times
Integrated inflow and outflow pipes - ensure optimum accuracy
Near zero pressure drop
Technical Details
Typical Accuracy of 3-6% of full scale
Screwed connections R, BSPT (British Standard Pipe Taper thread)
Maximum pressure 16BarA
Temperature range 0-60c
Power supply 24VDC
Air quality should conform to ISO 8573: recommended classes 1-4-1
Applications and Users
Compressed air consumption, leak detection and peak load management
Not suitable for gases over 90% Relative humidity


The FL6441 to FL6444 Compressed Air Flow Meter






Measuring range (1:300)

0.25 to 75 Nm3/h

0.75 to 225 Nm3/h

1.3 to 410 Nm3/h

2.3 to 700 Nm3/h

Unit Length

300 mm

475 mm

Pipe diameter

DN 15 (for 1/2“ pipes)

DN 25 (for 1“ pipes)

DN 40 (for 1 1/2“ pipes)

DN 50 (for 2“ pipes)


0.9 kg

1.1 kg

3.0 kg

3.8 kg

Temperature display

0 to +60 °C, measurement error ±2 K, (+32 to +140 °F)

Measurement stretch: thread

(both sides) / material

R 1/2, outer thread

Stainless steel 1.4301

R1, outer thread

Stainless steel 1.4301

R1 1/2, outer thread

Stainless steel 1.4401

R2, outer thread

Stainless steel 1.4401

Protection class


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