Model
FD-H20K
Type
High-temperature model
Supported pipe diameter
1/2″ (15A), ø18–23 ø0.71″-0.91″
3/4″ (20A), ø23–28 ø0.91″-1.10″
Supported pipe materials
Metal piping, hard plastic piping*1
Supported fluids
All fluids (water, oil, chemicals, etc.)*1
Supported fluid temperature
0–180°C 32–356°F (no freezing on pipe surface)*2*3
Maximum rated flow
1/2″ (15A) : 60 L/min 15.9 gal/min
3/4″ (20A) : 100 L/min 26.4 gal/min
Zero cut flow rate
0.5 L/min 0.13 gal/min (variable, initial value)
Detection principle
Delta TOF + Pulse Doppler
Function for automatic correction for speed of sound in liquid
Yes
Display
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*4*5
Between 0 and 10% of F.S.: ±0.3% of F.S.*4*5
Repeatability
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.*4*6
Hysteresis
Variable
Flow units
L/min m3/h G/min
Pulse output increments (L)
0.02–999.99
Pipe temperature measurement accuracy
—
Network support
IO-Link*7
Heat calculation function
Unit
MJ/h kW kBTU/h*8
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)*8
Pulse output increments (MJ)
0.02–999.99*8
Data accumulation
Accumulation period
Approx. 1 year
Data reading
USB2.0
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)*9
Protection circuit
Protection against reverse power connection, power supply surges, output short circuits, and output surges
Environmental resistance
Enclosure rating
IP65/67 (IEC 60529)*10
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
Material
Display unit
Body: PPS/PET/POM; Display window: PAR
Sensor head
Body: PEEK/PPS/PET/PAR/SUS304
Sensor element: special rubber; Mounting bracket: SUS304/SUSXM7
Weight
approx. 540 g 19.05 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 When using with fluids at temperatures of 140°C 284°F or greater, equip with the separately sold ultra-high-temperature couplant FD-HK1/HK2/HK3. Furthermore, the display unit must be separated from the sensor based on the de-rating.
*4 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.
*5 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.
*6 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.
*7 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).
*8 Can be used when two temperature sensors (sold separately) are connected.
*9 640 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).
*10 When a USB connection is in use, IP65/67 compliance is impaired.
