GL-VM88HP Type 4 Safety Light Curtain 88 Beams 1760 mm

What Is the Keyence GL-VM88HP Safety Light Curtain?

The Keyence GL-VM88HP is a Type 4 safety light curtain transmitter and receiver set for hand protection. It provides 88 beam axes with 20 mm spacing and a 1740 mm detection height, verified to IEC61496-1/-2 Type 4 ESPE/AOPD and EN ISO13849-1 Category 4 PL e.

Engineered for machine safeguarding, This unit combines optical synchronization with a 0.3 to 15 m detecting distance. Its 1760 mm total length and aluminum alloy housing suit demanding industrial environments. The set delivers engineering-grade precision for personnel protection in automated cells.

Key Specifications of This unit

• Supply voltage: 24 VDC -20/+25%, ripple (P-P) 10% or less, Class 2
• Output current: Maximum load current 150 mA or less; OSSD transistor output x2 (PNP)
• Isolation: Optical synchronization between transmitter and receiver
• Detection: 88 beam axes, 20 mm spacing, ø25 mm minimum object, 1740 mm detection height
• Response time: max. 7.5 ms (OSSD, channel 0, ON→OFF)
• Protection rating: IP65/IP67 (IEC60529)
• Operating temperature: -30 to +55 °C (No freezing)
• Weight: Transmitter 1140 g; Receiver 1160 g

How Does This unit Compare with Other Safety Light Curtains?

When selecting a safety light curtain, engineers balance detection capability, environmental resilience, and integration effort. This unit differentiates itself through exact optical and electrical parameters.

• Detection resolution: 88 beams at 20 mm spacing enable hand protection with ø25 mm minimum object detection. Curtains with larger spacing suit body detection only.
• Supply voltage: 24 VDC -20/+25% with Class 2 input accommodates industrial power networks. Some alternatives require regulated supplies with tighter tolerances.
• Output current: 150 mA or less maximum load current supports direct connection to safety relays. Lower-current models may need interposing relays.
• Isolation: Optical synchronization eliminates dedicated sync wires between transmitter and receiver, simplifying cabling.
• Environmental range: -30 to +55 °C operating temperature and IP65/IP67 rating allow deployment in washdown or outdoor enclosures.
• Response time: max. 7.5 ms supports safety distances calculated per ISO 13855.

These parameters make This unit suitable for applications where precise hand protection and robust sealing are mandatory.

Where Is This unit Typically Applied?

Hand protection light curtains are common in press brakes, packaging machines, and robotic workcells. This unit's 1740 mm detection height covers typical access openings. Its 0.3 to 15 m detecting distance allows flexible mounting around large equipment. Because the OSSD outputs are PNP, the set integrates with positive-logic safety controllers. The IP65/IP67 rating supports use in food processing areas subject to washdown.

Installation and Integration Notes

Mount the transmitter and receiver at the calculated safety distance using the response time of max. 7.5 ms. Verify that the 24 VDC supply meets the -20/+25% tolerance and Class 2 requirement. Connect the two PNP OSSD outputs to the safety relay or controller. Optical synchronization requires no physical link between the units. For series connection of up to 2 units, set the interference prevention switch accordingly. Confirm cable and connector compatibility with AutoDCSTech before commissioning.

Maintenance and Reliability

Inspect the front covers periodically for contamination that could attenuate the infrared beam. Clean with a soft cloth and mild detergent; avoid abrasive materials. Verify the operating temperature remains within -30 to +55 °C. The aluminum alloy housing and polycarbonate front cover resist mechanical impact. Check the OSSD outputs for correct switching during scheduled machine downtime. These practices support long service life and reduce unplanned stoppages.