Keyence GL-R20H Type 4 Light Curtain 20 Beam Safety Sensor

Keyence GL-R20H Type 4 Safety Light Curtain — Hand Protection with 20 Beams

Technical Specifications

• Brand: Keyence
• Model: GL-R20H
• Series: GL-R series
• Category: Type 4 safety light curtain, hand protection
• Detection capability: ø25 mm
• Beam axes: 20 with 20 mm spacing
• Detection height: 380 mm; total length 400 mm
• Detecting distance: 0.2 to 15 m
• Response time (OSSD ON→OFF): max. 6.6 ms
• Light source: Infrared LED at 870 nm
• Effective aperture angle: max. ±2.5° at 3 m or more
• Supply voltage: 24 VDC ±20%, ripple 10% or less, Class 2
• Control output (OSSD): 2 transistor outputs, max. 500 mA
• Current consumption: Transmitter max. 53 mA; receiver max. 71 mA
• Operating temperature: -10 to +55 °C, no freezing
• Storage temperature: -25 to +60 °C, no freezing
• Relative humidity: 15 to 85 % RH operating; 15 to 95 % RH storage
• Ambient light immunity: 3,000 lux incandescent; 20,000 lux sunlight
• Protection rating: IP65/IP67 per IEC60529
• Safety standards: IEC61496-1/-2 Type 4, IEC61508 SIL3, IEC62061 SIL CL3, EN ISO13849-1 Category 4 PLe, UL508, UL1998
• EMC: IEC/EN61496-1, EN55011 Class A, FCC Part15B Class A, ICES-003 Class A
• Weight: Transmitter 550 g; receiver 550 g
• Material: Aluminum main unit; nylon GF30 upper/lower case; polycarbonate front cover with SUS304

Key Performance and Environmental Resilience

• Interference prevention: Up to 2 GL-R systems run side by side via Channel A/B switch for optical sync or automatic for wire sync.
• Protection circuit: Reverse-current, per-output short-circuit, and surge protection keep the sensor stable in demanding electrical environments.
• Residual voltage (ON): max. 2.5 V with a 5 m cable; OFF-state voltage max. 2.0 V.
• Leakage current: max. 200 µA; max. capacitive load 2.2 µF; load wiring resistance max. 2.5 Ω.
• Supplemental output: AUX, error, and muting-lamp transistor output with max. 50 mA load.
• Overvoltage category: II, suitable for standard industrial control panels.

Installation Guide

• Mount the transmitter and receiver opposite each other using the aluminum housing mounting holes.
• Align both units so the infrared beams reach the receiver within the ±2.5° effective aperture angle.
• Keep the detecting distance between 0.2 m and 15 m for reliable hand detection.
• Select optical synchronization or wire synchronization according to your wiring layout and cable type.
• Connect the 24 VDC supply with ripple below 10% and confirm the Class 2 power source.
• Wire the two PNP or NPN transistor OSSD outputs to the safety relay or controller.
• Set Channel A/B when two GL-R systems operate close together to avoid optical interference.
• Verify the 6.6 ms response time meets the safety distance calculation for your machine.
• Test the detection zone with a ø25 mm test rod before commissioning the line.

Packing List

• GL-R20H transmitter unit (550 g)
• GL-R20H receiver unit (550 g)
• Mounting brackets and screws
• Instruction sheet for the GL-R series
• Protective packaging for safe transport

Shipping and Support

• We ship worldwide by FedEx, UPS, and DHL.
• Stock items leave our warehouse within 5 days.
• We accept returns within 30 days of delivery.
• All units are brand new and original from Keyence.

FAQ

• Q: What detection capability does the GL-R20H offer?
  A: The GL-R20H detects a ø25 mm object, which suits hand protection applications.
• Q: How many beam axes does this model have?
  A: It has 20 beam axes with 20 mm spacing and a 380 mm detection height.
• Q: What is the maximum detecting distance?
  A: The detecting distance ranges from 0.2 m to 15 m.
• Q: How fast does the OSSD respond?
  A: The response time from ON to OFF is max. 6.6 ms.
• Q: Can two GL-R systems work near each other?
  A: Yes, interference prevention supports up to 2 GL-R systems with Channel A/B or automatic wire sync.
• Q: What protection rating does the housing carry?
  A: The unit carries IP65/IP67 protection per IEC60529 for dusty and wet environments.
• Q: What operating temperature range does it support?
  A: It operates from -10 to +55 °C without freezing.
• Q: How does the GL-R20H differ from the GL-R16H?
  A: The GL-R20H has 20 beams and a 400 mm total length, while the GL-R16H offers 16 beams and 320 mm.
• Q: Is the GL-R20H available in stock?
  A: Yes, we keep brand new original stock and ship within 5 days.