KEYENCE LS20 Radar Type Level Sensor Instruction Manual

(2) Distance to top surface (100%): 100 mm
Tank top surface (100%)

Tank view

Curdreisnptlvaaylue % display Analogoutput

1000 mm

100%

20 mA

Tank bottom (0%)

400 mm Current value

40% 10.4 mA

(1) Distance to bottom (0%): 1100 mm

0 mm

0%

4 mA

When using an oil-based liquid (low specific conductive capacity)
You can select [Oily Liquid] for “Detection target” to automatically mask the area close to the bottom of the tank, preventing false detections of the bottom of the tank. The current value display shows “- – -” in the masked area. For details on the masking function, see the user’s manual.

Tank view

Curdreisnptlvaaylue % display Analogoutput

1000 mm

100%

20 mA

E2

100 mm (0 mm)

10% (0%)

5.6 mA (4 mA)

Installation and Mounting Mounting the sensor Mounting on the flange nozzle
1 Fit a gasket (included with the flange mounting bracket)1 on the flange
mounting bracket, and then mount the sensor or sensor head on the flange mounting bracket. Recommended tightening torque: 30 N·m for the FR-LM20 and 1.5 N·m for the FR-LP20
2 Insert a flange gasket1 between the parts, and then use nuts and bolts
to mount the flange mounting bracket on the flange nozzle. 1 Rubber packing is not required if an airtight seal is not required.
Bolts: not included Sensor or sensor head
Gasket (OP-88891): included with the flange mounting bracket
Flange mounting bracket (equivalent to JIS5K/10K 50A, DIN PN10 DN50, ANSI class 150 2″): OP-88880 (SUS304)/OP-88885 (PVC)
Flange gasket: not included
Flange: not included
Nuts: not included

Mounting directly on a top panel (using a mounting bracket, not a nut)
1 Insert the threads of the sensor or sensor head into a general
mounting bracket. Recommended tightening torque: 30 N·m for the FR-LM20 and 1.5 N·m for the FR-LP20
2 In the top panel, drill a hole with a diameter of 49 mm and four screw
holes for securing the general mounting bracket, and then use screws to secure the general mounting bracket on this panel.
Sensor or sensor head
M5 screws: not included
General mounting bracket: OP-88881 (SUS304)/OP-88919 (PPS)
Top panel (thickness: 10 mm or less)
Mounting directly on a top panel (screwing in the device)
1 Drill a G1-1/2 screw hole in the top panel. 2 Fit a gasket1 on the threads of the sensor or sensor head, and then
screw this device into the top panel. Recommended tightening torque: 30 N·m for the FR-LM20 and 1.5 N·m for the FR-LP20 1 A gasket is not required if an airtight seal is not required
Sensor or sensor head
Gasket: OP-88890 (inorganic fiber + oil-resistant rubber)/OP-88891 (FKM)

Mounting on a ferrule
1 Attach the OP-88920 aligned with the sides of the lens unit at the
bottom of the sensor.
2 Mount the gasket included with the ferrule mounting bracket on the
top of this bracket.
3 Mount the ferrule mounting bracket on the sensor or sensor head.
Recommended tightening torque: 30 N·m for the FR-LM20/LS20 and 1.5 N·m for the FR-LP20
4 Mount the ferrule gasket on the ferrule, and then mount this assembly
on the sensor using a clamp.
Sensor or sensor head Gasket: OP-88920 (EPDM)
Gasket: included with the ferrule mounting bracket Ferrule mounting bracket (2S): OP-88888/ OP-88889 (with leakage port)

• Mount on a ferrule that meets the following dimensions. LD L must not exceed 127 mm.
  %
  Recommended installation conditions
  The FR Series beam widens as follows. Ensure there are no metal obstacles in the following range.
  0

Mounting with separated display (standard model/chemical model)
1 Remove the two screws (M3
screws for the FR-LM20 and M4 screws for the FR-LP20) from the back, and then pull the display away from the sensor head.
2 Connect the display and the
sensor head with a dedicated cable (FR-LMS5 or FR-LPS5), and then tighten the screws in two locations on the display and sensor head to secure the cable. Recommended tightening torque: 6.3 N·m (FR-LMS5)/0.2 N·m (FR-LP20)
Point Applying more than the recommended tightening torque may damage the screws.
3 Secure the display with the Panel Mounting Bracket FR-LB1 or Rear
Mounting Bracket FR-LB2.

Measuring distance: m –

Mounting directly on a top panel (mounting with a nut)
1 Drill a hole with a diameter of 49 mm in the top panel. 2 Fit a gasket1 on the threads of the sensor or sensor head, and then
insert the threads in the hole in the top panel.
3 Attach a nut from the bottom of the top panel.
Recommended tightening torque: 30 N·m for the FR-LM20 and 1.5 N·m for the FR- LP20 1 A gasket is not required if an airtight seal is not required.
Sensor or sensor head
Gasket: OP-88890 (inorganic fiber + oil-resistant rubber)/OP-88891 (FKM)
Top panel (thickness: up to 16 mm)
Nut: OP-88883 (SUS304)/OP-88887 (PPS)

Top panel (thickness: 24 mm or less)
Mounting on an inner wall
1 Mount a side mounting bracket on a wall with M6 screws. 2 Insert the sensor or sensor head into the bracket, and then attach a
nut from the bottom of the bracket. Recommended tightening torque: 30 N·m for the FR-LM20 and 1.5 N·m for the FR-LP20
Sensor or sensor head
Wall surface
Side mounting bracket: OP-88882 (SUS304)/ OP-88886 (PPS) M6 screws: not included (eight for the OP-88882 and four for the OP-88886) Nut: included with the side mounting bracket (the OP-88883 for the OP-88882 and the OP-88887 for the OP-88886)

5 Oil-based liquid or powder
Water-soluble liquid 10

15

20

-10

-5

0

5

10

Beam widening: m

1 In the case of a metal wall with a smooth surface (having depressions and protrusions shorter than 2.5 mm), there are no problems if the wall is within the range.

Detection may be unstable at close distances. Install the sensor or sensor head at the following recommended distances from the expected upper limit of the liquid level.

Reference surface of the sensor
Highest expected liquid level

Water-soluble liquid: 30 mm Oil-based liquid (specific conductive capacity less than 10): 120 mm Powder (specific conductive capacity of 2.2): 170 mm

Adjusting the orientation of an installed sensor
The case can be rotated up to approximately 340°. After securing the sensor to a mounting bracket or something similar, rotate the case while holding the hexagon part in place with a wrench to orient the display as desired.
Point The case of the sanitary model (FR-LS20) does not rotate. Adjust its orientation when mounting the sensor on a ferrule.

E3

E4

Attaching/removing the cover (sanitary model)

· Removing the cover Turn the cover counterclockwise, and then remove it.

· Attaching the cover Align the indentation on the cover with the entrance to the groove, and then turn the cover clockwise.

Wiring Pin layout

· Power cable connector pin layout

2

1

8

3

7

Pin # 1 2

Color White Brown

Description Analog output Power supply (24 VDC)

4

6

5

3

Green OUT3

4

Yellow OUT4

5

Gray OUT1

6

Pink OUT2*

7

Blue 0 V

8

Red OUT5

*IO-Link-compatible wire when connecting an IO-Link device

Independently insulate any unused input/output wires.

Load (input device)
(1) Control output wiring · NPN

Brown OUT Blue (2) Analog output wiring Brown White

24 V 0 V 24 V

Analog current input device

· PNP

Brown

24 V

OUT

Blue 0 V

Blue

0 V * It is possible to switch between 4-20 mA and 0-20 mA using settings.

Connecting the Power Cable
1 Plug the power cable into the power cable connector.
When connecting the connector, plug it in straight and fix it firmly. NOTICE If the tightening is not sufficient, the connector may loosen, which may
lead to contact failures.

Initial Setting at First Startup
When the sensor is turned on for the first time, configure the following initial settings. · Select parameters with the U and V keys and use the z Set key to confirm entries. · To return to the previous screen, press the Y key.

I/O settings

PNP / NPN PNP
Number of control outputs 2
External input OFF
Set and continue

Back

Set

Underlined items are initial values

Language PNP/NPN

ENGLISH, , , DEUTSCH PNP, NPN

Number of control outputs 0, 1, 2, 3, 4, 5

Detection target

Water-soluble liquid, Oily Liquid, Powder

Distance unit

mm (millimeters), m (meters)

Display value scaling Display value unit1 Decimal point position1

OFF, ON No unit, mL, L, hL, m3, g, kg, t, mm, m, % 99999, 9999.9, 999.99, 99.999, 9.9999

Tank shape*1

Straight tank, Spherical tank, Cylindrical tank (horizontal placement), Cone base tank, Quadrangular pyramid base tank, Sloped base tank, Multipoint correction

Distance to bottom

0 to 25000 mm

Distance to top surface Height of base1, 2
Tank capacity1

0 to 25000 mm 0 to 25000 mm 0 to 99999

Number of multipoint correction points1, 3
Point 1_Height1, 3, 4

2 to 32 0 to 99999

Point 1_Current value
*1, 3, 4

0 to 99999

Set value 1*5

0 to 99999

Output logic 1*5

N.O., N.C.

Indicator pattern*6

Pattern 1, Pattern 2, Pattern 3, Only green, Always Off

1 This item is only displayed when [ON] is selected for “Display value selection.” 2 This item is only displayed when [Cone base tank], [Quadrangular pyramid base
tank], or [Sloped base tank] is selected for “Tank shape.” 3 This item is only displayed when [Multipoint correction] is selected for “Tank
shape.” 4 Points 2 to 32 are displayed depending on the value selected with Number of
multipoint correction points. 5 Numbers 1 to 5 are displayed depending on the value selected with Control
outputs. Nothing is displayed if “0” is selected with Control outputs. 6 The selectable number of patterns varies depending on the set judgment output
count.

· Number of control outputs
At most, there are five outputs, one external input, and one analog output. · Set the number of control outputs to use.
The set number of control outputs are assigned in order from OUT1. You can only use up to four control outputs when you select [ON] for “External input.” · Other functions can be assigned to outputs to which control outputs are not assigned. For details on these functions, see the user’s manual. · Each control output can also be changed to area mode. For details on area mode, see the user’s manual.

Pin #
5 6 3 4 8 1

Color

Name

Auxiliary output Control

External input

output

Error

Stability Period alarm change

Reset period change

Gray OUT1 3

3

3

3

–

Pink OUT2 3

3

3

3

–

Green OUT3 3

3

3

3

–

Yellow OUT4 3

3

3

3

–

Red OUT5/IN 3

3

3

3

3

White

Analog output

–

–

–

–

–

Analog output
3

IO-Link

• –

· Detection target Select [Water-soluble liquid] if the specific conductive capacity of the measurement target is 10 or higher, [Oil-based liquid] if the specific conductive capacity of the target is less than 10, and [Powder] if the target is a powder. If you select [Oil-based liquid], the area from the base to 10% of the height of the tank on the side far from the sensor is masked. For details, see the user’s manual.
Point Selecting an incorrect detection target may prevent accurate detection of the liquid surface.

· Distance to bottom Enter the distance from the reference surface of the sensor to the bottom of the tank. For the position of the reference surface of the sensor when using a mounting bracket, see the dimensions provided in, for example, the catalog. The height of the liquid surface from the bottom of the tank is displayed as the current value with the position indicated by this distance used as the zero point (0%).
Reference surface of the sensor

Distance to bottom

Liquid level

Current value
Tank bottom (zero point)

Reference surface of the sensor

· Distance to top surface
Enter the distance from the reference surface of the sensor to the top surface of the tank. This position is 100% in the % display.

Distance to top surface

Reference surface of the sensor 100%

0% · Display value selection
OFF: The height of the liquid level is displayed. ON : The display value is scaled and converted to volume or weight. For scaling, you can select the tank shape or enter a conversion table with up to 32 multipoint correction points. For details on multipoint correction, see the user’s manual.
· Output logic 1 N.O.: Control output turns on when the current value exceeds one of the set values. N.C.: Control output turns on when the current value drops below one of the set values.
· Indicator pattern You can select the lighting order of the ring indicator according to the liquid surface position. The indicator color is also linked to the color bar on the current value screen.
Set value 1
Set value 2
Set value 3
Set value 4

The number of selectable indicator orders varies depending on the number of control outputs. Select the indicator pattern from those shown below. To use a different pattern, select Custom. For details on how to set custom order, see the user’s manual.

Number of control outputs

Order 1

Order 2

Order 3 Only green Always Off

0

Green

Red

Green

1

Green

Red

Green Green

Red

Green

Red

Green

2

Yellow

Yellow

Green

Green

Green

Red

Red

Green

Red

Red

Red

Green

Yellow

Green

Green

Green

3

Green

Yellow

Green

Green

Red

Red

Green

Green

Red

Red

Yellow

Green

4

Green

Green

Yellow

Green

Red

Red

Red

Red

Yellow

Green

5

Green Green

Green Green

Yellow

Green

Red

Red

Green Green Green Green Green
Green Green Green Green Green Green

Basic Operation Current value screen

2134 mm

% display
42.7 %

Set value confirmation
2134 mm
4500 4000 1000
500

Flow conversion value display*
2134 mm
0
mm/min

Output indicators: The numbers of the on outputs light in orange.

Color bar: The color here is linked to the ring indicator.

Tank view: Indicates the current liquid level.

Set values: Show set values 1 to 5.

• This item is only displayed when “ON” is selected for Flow conversion mode.

Changing set values
Press the MENU key on the current value display to enter the menu, and then select Change set value. Use the S and T keys to adjust the set value, and then confirm the change with the z Set key.

Menu screen Menu
Current Value Basic installation settings Change set value Settings

Set value

4500 mm

2134

[mm]

5000

4000

Diagnosis function

Select

Set

1000 500
Back

0 Set

E5

E6

Key lock
This function prevents operation mistakes by locking/disabling key operations to prevent the settings from being easily changed. To require a password when canceling the key lock, set “Key lock method” to “With password.” Enabling/disabling the key lock: Hold down the MENU key and the T key for 3 seconds or more. When “Key lock method” is set to “With password,” the password is required when unlocking the keys.
Reference If the password entered is incorrect, an error will occur, and the normal screen will appear with the key lock still enabled.

Initializing settings
Press the MODE key on the current value screen to display the menu screen, and then select “Settings” > “Initialize.”
Maintenance
· Clean deposits and foreign substances on the mounting bracket and the bottom of the sensor or sensor head as necessary.
· If using the FR-LS20, it is recommended to replace the gasket (OP-88920) inside the ferrule mounting bracket once a year. At that time, also wipe away any dirt inside the ferrule mounting bracket with a soft cloth.

Specifications

Item
Measurement range1 Displayable range1

Standard model FR-LM(H)20(L)

Chemical model FR-LP(H)20(L) Max. 20 m 65.6 ft Max. 25 m 82.0 ft

Sanitary model FR-LS20(L)

Specific conductive capacity of target media*2

2 or more

Resolution Accuracy*3

1 mm 0 to 0.5 m: ±5 mm 0.5 to 10 m: ±1 mm 10 m to 20 m: ±2 mm

Control output response time

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

Tank pressure

-0.1 to 1 MPa

-0.1 to 0.1 MPa

-0.1 to 1 MPa

Material

Inside the tank

Lens: PTFE Internal packing: FKM entering part: SUS304

Lens: PTFE Internal packing: FKM
entering part: PPS

Lens: PTFE Ferrule internal packing: EPDM
(when using the OP-88920) Ferrule: SUS316L
(when using the OP-88888/88889)

Case

PPS PET PAR

PPS PPSU

SUS304

Connection port

G1-1/2 (40A)

G1-1/2 (40A)

2S ferrule (when using the OP-88888/88889)

Number of control outputs

Max. 5

Output

Contro output/ alarm output

NPN/PNP open collector (switchable), 30 VDC max., 50 mA max. for each output, residual voltage: 1.4 V max. (50 mA max.),
N.O./N.C. switchable, IO2 also used for IO-Link, IO5 also used for external input

Analog output

0-20mA/4 to 20 mA, maximum load resistance: 260 (Response time: 0.2 s after comparator output determined [90% response])

Network compatibility

IO-Link v1.1/COM2

Resolution

Analog output accuracy

Zero accuracy

F.S. accuracy

1 mm ±0.1 mA (zero = 4 mA) ±0.2 mA (F.S. = 20 mA)

Ambient temperature
Environmental Ambient humidity resistance Operating coupling
temperature4, 5 Vibration resistance Shock resistance

Built-in and separated display: -20 to +50°C (no freezing)4, 5
Separated head: -20 to +60°C (no freezing)4, 5

Built-in and separated display: -10 to +50°C (no freezing)4, 5
Separated head: -10 to +60°C (no freezing)4, 5
Max. 85%RH (no condensation)

-20 to +60°C (no freezing)4, 5

-20 to +85°C (no freezing)4, 5

-10 to +85°C (no freezing)4, 5

-20 to +100°C (no freezing)4, 5

10 to 500 Hz; Power spectral density: 0.816 G2/Hz; X, Y and Z directions 100 m/s2 (approx. 10 G), 16 ms pulses, 1000 times each for X, Y and Z axes

Enclosure rating

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

IP67(IEC60529), IP69K(ISO20653)

Protection circuit

Protection against reverse power connection, output overcurrent, output surge, and reverse output connection

Power voltage

24 VDC+25%/-20% including ripple, Class 2/LPS

Current consumption

56 mA max. (at 20 V)/ 48 mA max. (at 30 V) (excluding load)

75 mA max. (at 20 V)/ 67 mA max. (at 30 V) (excluding load)

56 mA max. (at 20 V)/ 48 mA max. (at 30 V) (excluding load)

Corresponding cable/connector

8-pin M12 connector

1 Value guaranteed with water and the recommended mounting method. With water and the recommended mounting method, measurement is possible right up to the lens surface. An undetectable area on the near side occurs due to the relationship between the environment and the measurement medium. Additionally, the maximum measuring distance decreases.
2 The target shape or the environment may make measurement impossible. 3 This value is guaranteed by KEYENCE inspection facilities. Errors may occur due to your environment. 4 The operating temperature range for each model is as follows.

Ambient temperature Ambient temperature

FR-LM(H)20(L)/LP(H)20(L) 80

70

Separated display

60 50

Built-in display

40

Protection cover attached

30

with built-in display

20

10

0

-10

-20

-20

0

20

40

60 80 100 120

Coupling temperature

FR-LS20(L) 80

70

60

50

40

30

20

10

0

-10

-20

-20

0

20

40

60 80 100 120

Coupling temperature

On the FR-LM20/LP20, selecting [Turns off when no op.] for “Screen brightness” can alleviate the ambient temperature regulation by 10°C. *5 When performing SIP with the FR-LM(H)20(L)/LP(H)20(L)/LS20(L), turn the power supply off, and then perform this operation for 1 hour or less with an ambient temperature of
40°C or less and an internal system temperature of 130°C. Also, be sure to attach a ferrule mounting bracket and an internal gasket, which are optional KEYENCE products.
E7

WARRANTIES AND DISCLAIMERS
(1) KEYENCE warrants the Products to be free of defects in materials and workmanship for a period of one (1) year from the date of shipment. If any models or samples were shown to Buyer, such models or samples were used merely to illustrate the general type and quality of the Products and not to represent that the Products would necessarily conform to said models or samples. Any Products found to be defective must be shipped to KEYENCE with all shipping costs paid by Buyer or offered to KEYENCE for inspection and examination. Upon examination by KEYENCE, KEYENCE, at its sole option, will refund the purchase price of, or repair or replace at no charge any Products found to be defective. This warranty does not apply to any defects resulting from any action of Buyer, including but not limited to improper installation, improper interfacing, improper repair, unauthorized modification, misapplication and mishandling, such as exposure to excessive current, heat, coldness, moisture, vibration or outdoors air. Components which wear are not warranted.
(2) KEYENCE is pleased to offer suggestions on the use of its various Products. They are only suggestions, and it is Buyer’s responsibility to ascertain the fitness of the Products for Buyer’s intended use. KEYENCE will not be responsible for any damages that may result from the use of the Products.
(3) The Products and any samples (“Products/Samples”) supplied to Buyer are not to be used internally in humans, for human transportation, as safety devices or fail-safe systems, unless their written specifications state otherwise. Should any Products/ Samples be used in such a manner or misused in any way, KEYENCE assumes no responsibility, and additionally Buyer will indemnify KEYENCE and hold KEYENCE harmless from any liability or damage whatsoever arising out of any misuse of the Products/Samples.
(4) OTHER THAN AS STATED HEREIN, THE PRODUCTS/SAMPLES ARE PROVIDED WITH NO OTHER WARRANTIES WHATSOEVER. ALL EXPRESS, IMPLIED, AND STATUTORY WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND NON-INFRINGEMENT OF PROPRIETARY RIGHTS, ARE EXPRESSLY DISCLAIMED. IN NO EVENT SHALL KEYENCE AND ITS AFFILIATED ENTITIES BE LIABLE TO ANY PERSON OR ENTITY FOR ANY DIRECT, INDIRECT, INCIDENTAL, PUNITIVE, SPECIAL OR CONSEQUENTIAL DAMAGES (INCLUDING, WITHOUT LIMITATION, ANY DAMAGES RESULTING FROM LOSS OF USE, BUSINESS INTERRUPTION, LOSS OF INFORMATION, LOSS OR INACCURACY OF DATA, LOSS OF PROFITS, LOSS OF SAVINGS, THE COST OF PROCUREMENT OF SUBSTITUTED GOODS, SERVICES OR TECHNOLOGIES, OR FOR ANY MATTER ARISING OUT OF OR IN CONNECTION WITH THE USE OR INABILITY TO USE THE PRODUCTS, EVEN IF KEYENCE OR ONE OF ITS AFFILIATED ENTITIES WAS ADVISED OF A POSSIBLE THIRD PARTY’S CLAIM FOR DAMAGES OR ANY OTHER CLAIM AGAINST BUYER. In some jurisdictions, some of the foregoing warranty disclaimers or damage limitations may not apply.
BUYER’S TRANSFER OBLIGATIONS: If the Products/Samples purchased by Buyer are to be resold or delivered to a third party, Buyer must provide such third party with a copy of this document, all specifications, manuals, catalogs, leaflets and written information provided to Buyer pertaining to the Products/Samples.
E 1101-3
Copyright (c) 2023KEYENCE CORPORATION. All rights reserved. xxxxxGB 2093-1 xxxxxx Printed in Japan
E8

References

• KEYENCE CORPORATION OF AMERICA
• Declaration of Conformity for RE Directive | KEYENCE America

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