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




Supported pipe diameter

Pipe outer diameter


Installable range

8.0 ±0.15 mm

Pipe materials

Polyurethane, nylon, PFA*1, others*2

Supported fluids

Air, nitrogen, argon, other gases*3

Supported fluid temperatures

−10 to +60°C

Operating pressure range

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

Flow detection principle

Transmission time difference method

Rated flow

(volumetric flow)

70 L/min *Initial display

(at 20°C, atmospheric pressure)

Gas at 20°C, 0.2 MPa

210 L/min

Gas at 20°C, 0.4 MPa

350 L/min

Gas at 20°C, 0.6 MPa

490 L/min


2.5% of F.S. at 250-ms response time*4*5

Display resolution

Instantaneous flow

0.01/0.1/1 L/min

Integrated flow

0.01/0.1/1/10/100 L

Display method

Output indicators

Environmental resistance

Enclosure rating

IP65 (IEC60529)

Ambient temperature

-10 to +60°C (no freezing)

Relative humidity

35–85% RH (no condensation)

Vibration resistance

10 to 500 Hz; Power spectral density: 0.816 G2/Hz; X, Y and Z directions

Shock resistance

100 m/s2, 16 ms pulses, 1000 times each for X, Y, and Z directions


Sensor unit


Sensor surface

Special rubber


Approx. 105 g

*1 PFA tubing should be used in environments of 40°C or less.
*2 The plastic tube through which ultrasonic waves penetrate.
*3 The gas through which ultrasonic waves penetrate. Readings may become unstable depending on the pipe’s internal pressure 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 is the guaranteed value from verification performed at KEYENCE inspection facilities. Errors may occur according to the type and condition of the customer’s pipes, the type of fluid, the fluid temperature, and other factors.

Data Sheet (PDF) Other Models