Flow Sensors Standard model 8A/10A FD-H10

FD-H10 - Flow Sensors Standard model 8A/10A

*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
  • CSA





Standard model

Supported pipe diameter

1/4" (8A), ø13–16 ø0.51"-0.63"
3/8" (10A), ø16–18 ø0.63"-0.71"

Supported pipe materials

Metal piping, hard plastic piping*1

Supported fluids

All fluids (water, oil, chemicals, etc.)*1

Supported fluid temperature

0–85°C 32–185°F (no freezing on pipe surface)*2

Maximum rated flow

1/4" (8A) : 20 L/min
5.3 gal/min
3/8" (10A) : 30 L/min
7.9 gal/min

Zero cut flow rate

0.3 L/min 0.08 gal/min (variable, initial value)

Detection principle

Delta TOF + Pulse Doppler

Function for automatic correction for speed of sound in liquid



QVGA 2.0 model: color LCD, status indicator light

Display update cycle

Approx. 10 times/second

Display resolution

Instantaneous flow

0.01/0.1/1 (L/min) (default value: 0.1)

Integrated flow

0.01/0.1/1 (L) (default value: 0.1; up to 8 digits)

Response time

0.5 s / 1.0 s / 2.5 s / 5.0 s / 10.0 s / 30.0 s / 60.0 s / 120.0 s / 200.0 s

Measurement accuracy

Between 10 and 100% of F.S.: ±3.0% of RD*3*4
Between 0 and 10% of F.S.: ±0.3% of F.S.*3*4


0.5 s: ±1.0%, 1 s: ±0.7%, 2.5 s: ±0.45%, 5 s: ±0.3%, 10 s: ±0.2%, 30 s: ±0.15%, 60 s: ±0.1% of F.S.*3*5



Flow units

L/min m3/h G/min

Pulse output increments (L)


Pipe temperature measurement accuracy

±2.0°C ±3.5°F (pipe temperature 0–50°C 32–122°F) , ±3.0°C ±5.4°F (pipe temperature 50–85°C 122–185°F) (ambient temperature of 25°C 77°F)*3

Network support


Heat calculation function


MJ/h kW kBTU/h*7

Display resolution

Instantaneous value (MJ/h): 0.01/0.1/1 (default value 0.1); Integrated value (MJ): 0.01/0.1/1 (default value 0.1)*7

Pulse output increments (MJ)


Data accumulation

Accumulation period

Approx. 1 year

Data reading


Power I/O connector

M12 8-pin connector (male)

I/O (switchable)

Output (Ch1/2/3/4)

Instantaneous flow mode / area mode / pulse output mode / integrated flow mode / bubble detection mode / error output
NPN/PNP setting switching, open collector output 30 VDC or less, max. 100 mA/Ch or less, residual voltage 2.5 V or less

Analog output (Ch1/2)

4–20 mA/0–20 mA (switchable), load resistance 500 Ω or less

External input (Ch2/3)

Integrated reset input / flow-rate zero input / zero-point adjustment input / bank input
Short circuit current: 1.5 mA or less; input time: 20 ms or more

Power supply

Power voltage

20–30 VDC, ripple (P-P) 10% included, Class 2/LPS

Current consumption

240 mA or less (when using flow sensor standalone; with analog output; excluding load current)*8

Protection circuit

Protection against reverse power connection, power supply surges, output short circuits, and output surges

Environmental resistance

Enclosure rating

IP65/67 (IEC 60529)*9

Ambient temperature

Sensor head: −20 to +60°C –4 to +140°F (no freezing); Display unit: −20 to +50°C –4 to +122°F (no freezing)*2

Relative humidity

35–85% RH (no condensation)

Vibration resistance

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

Shock resistance

100 m/s2 (approx. 10 G), 16 ms pulses, 1000 times each for X, Y and Z axes


Display unit

Body: PPS/PET/POM; Display window: PAR

Sensor head

Sensor element: special rubber; Mounting bracket: SUS304/SUSXM7


approx. 440 g 15.52 oz

*1 For fluids through which ultrasonic waves propagate, and which do not contain a large quantity of bubbles. Detection may be unstable depending on the type and condition of the pipe.
*2 When the display unit is mounted directly on the sensor head, there is a de-rating according to the ambient temperature and fluid temperature.
*3 This is the guaranteed value from verification performed at KEYENCE inspection facilities. Measurement error may occur depending on the type and condition of the customer’s pipes, the type of fluid, the fluid temperature and other factors.
*4 This is the value for when the zero point is adjusted, for a constant 25°C 77°F environment, taking into account the linearity and span error.
*5 In a state where flow velocity distribution is stable. Does not include pulsation and fluctuations in flow velocity distribution due to equipment factors. Please also convert the given F.S. (full scale) using the rated flow range.
*6 Supports IO-Link specification v.1.1/COM2 (38.4 kbps). Setting files can be downloaded from the KEYENCE website (www.keyence.com). IO-Link is a trademark or registered trademark of PROFIBUS Nutzerorganisation e.V. (PNO).
*7 Can be used when two temperature sensors (sold separately) are connected.
*8 640 mA or less including load. When connecting devices such as temperature sensors, please add on the current consumption of each sensor (up to a maximum of 830 mA or less).
*9 When a USB connection is in use, IP65/67 compliance is impaired.

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