Keyence FR Series Long Range 2-wire Standard Model Radar Level Sensor (FR-LW20(L)) Instruction Manual

Symbols Used in this Manual

• Danger: Indicates instructions that, if not followed, may result in death or serious injury.
• Caution: Indicates instructions that, if not followed, may result in injury or damage to the product or other property.
• Note: Highlights important operational points or information that deepens understanding.

For Your Safety

General Precautions

• Do not use this product to protect the human body.
• This product is not designed for explosion-proof areas.
• Avoid use in applications where product malfunction could cause serious injury or property damage (e.g., power plants, aviation, railways, medical equipment).
• For FR-SH01(C), avoid applications where leaching is a concern (beverages, food, medical use).
• When using FR-LP(H)20(L) in applications where leaching is a concern, use the ferrule attachment tool (OP-88888).
• Ensure proper risk assessment and implement risk reduction measures for the entire system.
• Confirm product installation and normal operation before use.
• Take sufficient safety measures to prevent damage in case of product breakdown.
• Clean the sanitary model (FR-LS20(L)) before use.
• Consider potential performance limitations when combining with other equipment.
• Check the resistance of sensor materials to media in acidic, alkaline, sanitary environments, or for applications like electroplating.

Installation Precautions

• Avoid locations with excessive vibration or shock.
• Avoid locations outside the specified ambient temperature range.
• Avoid locations with humidity above 85% RH (no condensation).
• Avoid locations with sudden temperature changes.
• Avoid locations with volatile flammable substances, solvents, or corrosive gases.
• Avoid locations with strong magnetic or electric fields.
• To improve noise resistance, keep power cable length to 20m or less for IO-Link.
• Install the product away from power lines and devices generating strong electric or magnetic fields.
• Route input/output signal lines separately from power lines and high-voltage lines.
• Use a DC stabilized power supply with isolation.
• Ground the terminal.
• Failure to follow recommended installation conditions may lead to unstable detection.

Notes on Regulations and Standards

CE and UKCA Marking

This product complies with the essential requirements of EU directives and UK regulations. For use in EU countries or the UK, adhere to the following:

• RE Directive (CE) and Radio Equipment Regulations (UKCA): Operating frequency: 58-63GHz. Maximum wireless output varies by model. Manufacturers of machinery incorporating this product are responsible for verifying conformity of the entire machinery.
• CSA Certification: Complies with CAN/CSA C22.2 No.61010-1 and UL61010-1. Ensure proper installation according to local regulations and use CSA/UL Listed certified power supplies.

Wireless Precautions

The FR series uses the 60 GHz band. Use in accordance with the laws and regulations of the country of use.

• Radio interference may occur near devices using the same frequency band (wireless LAN, microwave ovens, etc.).
• Before use, ensure no interfering radio stations are operating nearby.
• If interference occurs, change frequency or stop emission and contact Keyence for solutions.
• Do not disassemble or modify the unit, as this is prohibited by the Radio Law.
• This device is classified as specific wireless equipment under Japan's Radio Law.

Precautions on Radio Communication (FR-LW20L / FR-LW20)

Complies with FCC Rules Part 15 and Innovation, Science and Economic Development Canada's license-exempt RSS(s).

• Operation is subject to two conditions: no harmful interference, and acceptance of received interference.
• FCC CAUTION: Unauthorized modifications may void user's authority to operate.
• This equipment complies with FCC and ISED radiation exposure limits and should be installed and operated with at least 20cm distance from the human body.

Installation and Mounting

Sensor Body and Sensor Head Installation

• Flange Nozzle Installation: Use a gasket and flange mounting fixture. Recommended tightening torque: FR-LM20(L): 30Nm, FR-LP20(L): 15Nm. Ensure proper sealing with flange gasket and bolts/nuts.
• Direct Mounting to Top Plate (Nut Mounting): Drill a ⌀49 hole. Fit gasket, insert sensor, and secure with nut. Recommended tightening torque: FR-LM20(L): 30 N•m, FR-LP20(L): 15 N•m.
• Direct Mounting to Top Plate (Mounting Fixture): Attach sensor to mounting fixture. Drill holes in top plate and fasten fixture with screws.
• Direct Mounting to Top Plate (Screw Mounting): Drill a G1-1/2 screw hole. Fit gasket, mount sensor, and secure with recommended tightening torque.
• Mounting on Inner Wall: Attach side mounting bracket to wall. Insert sensor and secure with nut. Recommended tightening torque: FR-LM20(L): 30N-m, FR-LP20(L): 15N-m.
• Ferrule Installation: Attach OP-88920, gasket, and ferrule attachment tool. Secure with clamp. Recommended tightening torque: FR-LM20(L)/LS20(L): 30 N•m, FR-LP20(L): 15 N•m.

Recommended Installation Conditions

Install the sensor away from metal obstacles within the specified detection range. If conditions cannot be met, use the adjustment function (refer to FR Series User's Manual).

• Detection Range: Varies by target object. Ensure sufficient clearance.
• Placement: Recommended distance from the expected upper liquid level: Water-soluble liquid: 50mm, Oil-based liquid: 70mm, Powder: 170mm.

Adjusting the Installation Direction

The housing can be rotated approximately 340° to orient the display.

Wiring

Preparing the Cables

Use appropriate cables (AWG12-26 for power, AWG16-26 for signal). Recommended: shielded power cable.

Cable End Processing

Strip insulation and use ferrule terminals with specified tip lengths (8.0-10.0 mm for power, 8.0-10.0 mm for separate cables). Ensure total ferrule length does not exceed 127mm or 20mm respectively.

Wiring Procedure (Integrated Display)

1. Loosen screws on the display unit and open the front.
2. Pass power cable through the gland and wire to the upper terminal block. Tighten gland nut.
3. Push cables in fully and check connections.
4. Remove sensor head cover and attach cable gland to sensor head.
5. Pass separated cable through the gland and wire to the terminal block. Tighten gland nut.
6. Attach cable insertion port cover to the bottom of the display unit.
7. Attach the separate cable to the display unit's side cable. Route wires and connect to the terminal block. Tighten gland nut.
8. Connect the ground wire to the ground terminal on the sensor head.
9. Close the display unit front and tighten screws.

Wiring Procedure (Separate Display)

Refer to the manual for detailed steps on wiring a separate display unit.

Wiring with External Devices

Examples are provided for wiring to NPN and PNP input devices, including connections for 4-20mA output.

Note: Turn off power during wiring. Be careful not to pinch wires when closing the case.

Initial Settings at First Startup

Perform initial settings using the keys:

• Input/Output Settings: Select PNP/NPN.
• Language: Select desired language (English, Japanese, Chinese, Deutsch).
• Detection Target: Choose based on the medium (Water-soluble liquids, Oil-based liquids, Powders). Incorrect selection may lead to inaccurate readings.
• Distance to Bottom: Enter the distance from the sensor reference surface to the tank bottom. This sets the 0% level.
• Distance to Top Surface: Enter the distance from the sensor reference surface to the tank top. This sets the 100% level.
• Display Value Scaling: Set to ON to scale values to volume or mass using tank shape or multi-point correction (up to 32 points).
• Display Value Units: Select units (mm, m, mL, L, hL, m³, g, kg, t, %, etc.).
• Decimal Point Position: Configure decimal point display.
• Tank Shape: Select the tank's geometry (Straight, Spherical, Cylindrical, Conical, Pyramid, Sloped, Multi-point correction).
• Indicator Light Pattern: Customize the ring indicator's color and pattern based on the liquid level.

Note: For "Oil-based liquids" or unstable detection, an adjustment function screen may appear after initial settings.

Specifications

Indicator Light Pattern

The ring indicator's lighting pattern and color can be customized based on the liquid level. Settings include predefined patterns and custom options.

Changing the Indicator Light Setting Value

Navigate to the menu screen, select "Change indicator setting value," and adjust using the keys.

Adjustment Function

It is recommended to perform the adjustment function after initial settings for more stable detection.

Initializing Settings

Access the menu via the MODE key, select "Settings" > "Initialize" to reset settings.

Maintenance

Clean any deposits or foreign matter from the mounting bracket, sensor body, or sensor head as needed.

Applications

Keyence products are designed for general industry. Use in applications with high risk to human life or property (nuclear power plants, aviation, railways, medical equipment, etc.) requires prior consultation with Keyence and confirmation of product specifications at your own responsibility, including implementation of necessary safety measures.

Key Lock

This function locks the keys to prevent accidental operation. A PIN code can be set for unlocking.

• Activation/Release: Press and hold the MENU and UP keys simultaneously for over 3 seconds.
• PIN Code: If enabled, enter the PIN code to unlock.

Warranty Information

1. Applicable Products: Warranty applies to products manufactured and sold by Keyence. Consumables are not covered.
2. Warranty Period: One year after delivery.
3. Warranty Coverage: Free replacement for failures attributable to Keyence within the warranty period. Failures due to improper external conditions, environment, handling, usage, third-party modifications, lack of maintenance, unforeseen causes, or external factors (disasters, voltage abnormalities) are not covered.
4. Scope of Warranty: Limited to product replacement; does not cover secondary damages (equipment damage, lost business opportunities, lost profits).

Contact Information

• Phone: 0120-663-000 (Direct line to nearest sales office; some IP phones may not connect).
• Information Service: www.keyence.co.jp (Download catalogs, instruction manuals, CAD data, etc.).
• Export Document Service: www.keyence.co.jp/yushutsu (Download necessary export documents).

Keyence Corporation, Sensor Division
1-3-14 Higashi-Nakajima, Higashiyodogawa-ku, Osaka 533-8555, Japan

Specifications are subject to change without notice. Company and product names are trademarks or registered trademarks of their respective companies.