Long range Sensor main unit Standard model FR-LM20

FR-LM20 - Long range Sensor main unit Standard model

*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





Long range Standard model

Measuring range

Up to 20 m 65.6'*1

Display range

Up to 25 m 82.0'*1

Measurable dielectric constant of medium

2 or higher*2


1 mm 0.04"


Up to 0.1 m 0.3': ±10 mm 0.39";
0.1 to 10 m 0.3' to 32.8' : ±1 mm 0.04";
10 to 20 m 32.8' to 65.6': ±2 mm 0.08"

Response time

0.4 s, 1.5 s, 4 s (default value), 10 s

Tank pressure

-0.1 to +1 Mpa


Tank interior

Lens: PTFE
Internal packing: FKM
Joint: SUS304



Connection diameter

G1-1/2 (40 A)


No. of control outputs

Maximum 5

Control output/auxiliary output

NPN/PNP open collector (switching type)
30 VDC or less, max 50 mA for each
Residual voltage of 1.4 V or less (50 mA or less)
N.O./N.C. Switching type
IO2 is switchable to IO-Link

Analog output

0–20 mA/4–20 mA maximum load resistance 260 Ω
(Response time: 0.2 s after judgment output is confirmed [90% response])

External input

Network compatibility

IO-Link v1.1/COM2

Analog output accuracy


1 mm 0.04"*4

Zero accuracy

±0.1 mA (zero point = 4 mA)*4

F.S. accuracy

±0.2 mA (full-scale = 20 mA)*4

Power supply

Power voltage

24 VDC + 25%/–20%
Including ripple Class 2 or LPS

Power consumption

106 mA or less (Excluding Load Current)

Environmental resistance

Ambient temperature

Display part when combined and separated: –20 to +50°C -4°F to+122°F(no freezing)*5*6
Head when separated: –20 to +60°C -4°F to+140°F(no freezing)*5*6

Relative humidity

Up to 85% RH (no condensation)

Temperature of coupling used

–20 to +85°C -4°F to +185°F (no freezing)*5*6

Vibration resistance

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

Shock resistance

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

Enclosure rating

IP67 (IEC60529), Enclosure Type 4X (NEMA250)

Protection circuit

Protection against reverse power connection, power supply surges, output overcurrent protection, and output surges


Approx. 600 g 21.16 oz

*1 Guaranteed value in water with the recommended installation. Static water can be measured up to the edge of the lens. An undetectable area on the short-range side is created owing to the environment and measurement medium. The maximum measuring distance is also shortened.
*2 Measurement may not be possible depending on the shape and environment of the target.
*3 This is the guaranteed value from verification performed at KEYENCE inspection facilities. Measurement errors may occur depending on the customer’s environment.
*4 This is the guaranteed value from verification performed at KEYENCE inspection facilities with a load resistance of 250 Ω. Measurement errors may occur depending on the customer’s environment.
*5 The FR-LM20/LP20 can be used up to an ambient temperature setpoint of 10°C 50°F by selecting “Off when not in Operation” under “Screen Brightness.”
*6 When performing SIP with FR-LM20/LP20, be sure to turn off the power and perform at an ambient temperature of 40°C 104°F or less and an internal temperature of 130°C 266°F or less for up to one hour. In addition, always install the KEYENCE optional ferrule mounting bracket and internal gasket.

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