Sensor head ø8 FD-ECH8

FD-ECH8 - Sensor head ø8

*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


  • CE Marking
  • CSA




Pipe size

Outer diameter of pipe

ø8 0.31"

Installable range

8.0 0.31"
± 0.15 mm 0.01"

Pipe materials

Polyurethane, nylon, PFA,*1 other*2

Supported gases

Air, nitrogen, argon, and other gases*3

Supported gas temperature

−10°C to +60°C 14 to 140°F

Operating pressure range

0 to 0.75 MPa (upper limit depends on pipe specifications)

Flow rate detection principle

Ultrasonic transmission time difference method

Rated flow rate

(volume flow rate)

70 L/min 2.47 CFM * Initial display

(20°C 68°F, atmospheric pressure conversion)

Gas at 20°C 68°F, 0.2 MPa

210 L/min
7.41 CFM

Gas at 20°C 68°F, 0.4 MPa

350 L/min
12.36 CFM

Gas at 20°C 68°F, 0.6 MPa

490 L/min
17.3 CFM


Response time 250 ms: ±2.5% of F.S.*4*5

Display resolution

Instantaneous flow

0.01/0.1/1 L/min

Accumulated flow

0.01/0.1/1/10/100 L

Display method

Output indicator

Environmental resistance

Enclosure rating

IP65 (IEC60529)

Ambient temperature

−10°C to +60°C 14 to 140°F (no freezing)

Relative humidity

35%RH to 85%RH (no condensation)

Vibration resistance

10 to 500 Hz, power spectral concentration: 0.816 G2/Hz, XYZ axes

Shock resistance

100 m/s2, 16 ms pulse, XYZ axes, 1000 times for each axis


Sensor unit


Sensor surface

Special rubber


Approx. 105 g
3.70 oz

*1 Use PFA tubes in an environment with a temperature of 40°C 104°F or less.
*2 Resin tubes that transmit ultrasonic waves.
*3 Gases that transmit ultrasonic waves. Measurement may be unstable due to the pressure inside of the pipe and the type of gas.
*4 Accuracy improves with longer response times. As a rule, this is by a proportion of √(250 ms/response time)x.
*5 This value is guaranteed by KEYENCE inspection facilities. Errors will be introduced by factors such as the condition and type of pipes as well as the temperature and type of gas.

Data Sheet (PDF) Other Models