GL-R28H Keyence Safety Light Curtain | Type 4 28-Beam Hand

GL-R28H Keyence Safety Light Curtain – Type 4, 28 Beams, Hand Protection

The GL-R28H is a robust Type 4 safety light curtain from the Keyence GL-R series. It ships as a transmitter and receiver set. The GL-R28H uses 28 infrared beam axes at 870 nm. Detection capability is ø25 mm for hand protection. Total length is 560 mm with a 540 mm detection height. It reaches 0.2 to 15 m and responds in 7.4 ms max.

Optical and Detection Data

• Brand: Keyence
• Model: GL-R28H
• Series: GL-R series
• Type: Type 4 ESPE / AOPD, transmitter + receiver
• Protection type: Hand protection
• Light source: Infrared LED, 870 nm
• Detection capability: ø25 mm
• Beam axes: 28
• Beam spacing: 20 mm
• Detection height: 540 mm
• Total length: 560 mm
• Detecting distance: 0.2 to 15 m
• Aperture angle: Max. ±2.5° at 3 m or more
• Response time: Max. 7.4 ms (OSSD, ch 0, ON→OFF)

Safety Outputs and Wiring

• Supply voltage: 24 VDC ±20%, ripple 10% or less, Class 2
• OSSD: 2 transistor outputs, PNP or NPN by cable type
• OSSD load: Max. 500 mA
• Residual voltage ON: Max. 2.5 V (5 m cable)
• OFF-state voltage: Max. 2.0 V (5 m cable)
• Leakage current: Max. 200 µA
• Capacitive load: Max. 2.2 µF
• Load wiring resistance: Max. 2.5 Ω
• Aux output: AUX / error / muting-lamp, max. 50 mA
• Synchronization: Optical or wire, set by wiring
• Interference prevention: Up to 2 GL-R systems

Compliance and Protection

• Safety standards: IEC61496-1/-2 Type 4, IEC61508 SIL3, IEC62061 SIL CL3
• Machine safety: EN ISO13849-1 Category 4, PLe
• North America: UL508, UL1998
• EMC: IEC/EN61496-1, EN55011 Class A, FCC Part15B Class A, ICES-003 Class A
• Protection circuit: Reverse-current, short-circuit, surge
• Current draw: Transmitter max. 59 mA, receiver max. 73 mA
• Rating: IP65/IP67 (IEC60529)
• Overvoltage category: II

Environment and Materials

• Operating temp.: -10 to +55 °C (no freezing)
• Storage temp.: -25 to +60 °C (no freezing)
• Humidity: 15 to 85 % RH operating, 15 to 95 % RH storage
• Ambient light: 3,000 lux incandescent, 20,000 lux sunlight
• Main unit: Aluminum
• Upper/lower case: Nylon (GF 30%)
• Front cover: Polycarbonate, SUS304
• Weight: 770 g each (transmitter and receiver)

Oiltech Controls’s Insight

• The 20 mm beam spacing catches hands before they reach the hazard.
• 7.4 ms response suits press brakes and high-speed doors.
• Optical sync saves wiring on long spans.
• Channel A/B switching stops crosstalk between two GL-R pairs.
• IP65/IP67 handles washdown and coolant mist.
• Aluminum body resists impact on robot cells.

Where the GL-R28H Fits

• Press brake and shearing machine guarding.
• Robot cell entry protection.
• Palletizer and case packer openings.
• Automated assembly station safety.
• Material handling and conveyor gates.
• Packaging machine infeed zones.

Oiltech Controls Review

We test each GL-R28H set before shipment. Both transmitter and receiver get an alignment check. We verify all 28 beams break cleanly. OSSD outputs switch 500 mA without dropouts. Response stays within 7.4 ms. The IP67 seal holds after a water spray test. Wiring resistance stays under 2.5 Ω on a 5 m cable. For older GL-R installations, this set restores full Category 4 protection.

Five Professional FAQs

Q: How do I choose between optical and wire synchronization?

A: Optical sync needs no extra wiring. Wire sync is more immune to nearby light curtains. Pick based on cable routing.

Q: Can two GL-R28H pairs run side by side?

A: Yes. Use Channel A/B for optical sync. Wire sync handles it automatically. Up to 2 systems are supported.

Q: What cable type sets PNP or NPN output?

A: The cable you order determines it. The OSSD logic follows the cable type. Confirm your PLC input before ordering.

Q: Does the GL-R28H need a separate safety relay?

A: Usually yes. The OSSD drives a safety relay or safety PLC for Category 4 and PLe.

Q: What should I inspect on a used GL-R28H?

A: Check the front cover for scratches. Test every beam with a ø25 mm rod. Confirm OSSD switches both channels. Look for water inside the lens window.

Why Buy From Oiltech Controls?

• 15+ years in industrial automation spare parts.
• Global shipping through FedEx, UPS, and DHL.
• Tested surplus and refurbished safety units available.
• 12-month warranty on qualifying products.
• Technical verification completed before dispatch.
• Obsolete control support for discontinued safety systems.

Warranty, Dispatch, and Carriers

• Warranty: 12 months.
• Dispatch: 24 to 28 hours after order.
• Carriers: FedEx, UPS, DHL.
• Tracking: Provided on every order.

Contact: info@oiltechcontrols.com or +86 158 8020 0923 (WhatsApp).

Copyright © 2026 Oiltech Controls Limited. https://www.oiltechcontrols.com/ All rights reserved.