Separate Amplifier Type Air Flow Sensor

FD-V40 series

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Sensor Head, Air/Nitrogen Detection Type, 250 L/min FD-A250

FD-A250 - Sensor Head, Air/Nitrogen Detection Type, 250 L/min

*Please note that accessories depicted in the image are for illustrative purposes only and may not be included with the product.

Data Sheet (PDF)


CAD Data

360°view (3D PDF)

  • CE Marking





For air or nitrogen (N2)

Detection range

7 to 250L/min (std)*1

Zero-cut flow rate

7 L/min (std)

Fluid type

Air, nitrogen (N2)

Detectable fluids

Clean gas that does not contain dust or oil mist (When compressed air is used, air that conforms to ISO class of 1.1.2 through 1.6.2 is allowable)*2

Detectable fluid temperature

0 to +50 °C 32 to 122 °F (No condensation, no freezing)

Connection bore diameter

Rc (PT) 1/2

Display power

Flow rate indicator: Green LED (x4). Output indication: Red LED

Environmental resistance

Pressure resistance

1.0 MPa

Applied pressure range

-0.07 to 0.7 MPa

Ambient temperature

0 to +50 °C 32 to 122 °F (No freezing)

Relative humidity

10 to 85 % RH (No condensation)

Vibration resistance

10 to 55 Hz, Double amplitude 0.75 mm 0.03", 3 hours in each of the X, Y, and Z axis*3

Shock resistance

300 m/s2, 10 times in each direction of each of X, Y and Z axis, 60 times in total


Measuring pipe section : Aluminum, SUS303, SUS304, polyetherimide, Fluorocarbon rubber, SiliconPiping section : Diecasting aluminum alloy, Case: Polysulfon, PBT


Head connector x 1


Approx. 190 g (including 3-m connector cable)

*1 Converted value assuming the integrated flow quantity under the conditions of 20 °C 68 °F at 1 atmospheric pressure 101.3 kPa.
*2 Quality grade of compressed air based on the ISO8573-1
Water content values shown in the bracket indicates the dew point temperature at atmospheric pressure.
E.g. The "Class 1.2.3" indicates the rating of 0.1 µm 0.004 Mil of the solid particle. –40 °C -40 °F of dew point under the pressure and 1 mg/m3 oil density.
*3 While the FD-B03 is used, is 0.45 mm 0.02".

Data Sheet (PDF) Other Models