pmt20ri – photo tr pl 20m spdt

Why Choose the Carlo Gavazzi PMT20RI Through-Beam Photoelectric Receiver?

The Carlo Gavazzi PMT20RI is a robust through-beam photoelectric receiver designed for reliable long-range object detection in industrial automation and machine control applications. Part of the Carlo Gavazzi PMT series, it provides a maximum sensing distance of 20 m when paired and correctly aligned with the corresponding through-beam transmitter.

The PMT20RI uses 880 nm modulated infrared light and features adjustable sensitivity, allowing the detection system to be optimised for different installation conditions. Its SPDT relay output provides both normally open and normally closed contacts, while selectable light/dark switching gives engineers flexibility when integrating the sensor into machinery and industrial control circuits.

A wide operating supply of 10.8–264 V DC or 21.6–264 V AC allows the PMT20RI to operate with a broad range of industrial power systems. Screw-terminal wiring through a 1/2-inch NPT cable entry, durable plastic housing and IP67 protection make it a practical solution for demanding material handling, packaging and automated machinery applications.

Key Advantages

• Long-range through-beam detection up to 20 m.
• SPDT relay output provides normally open and normally closed contacts.
• Adjustable sensitivity allows detection performance to be optimised during commissioning.
• Wide AC/DC operating voltage range supports integration with different industrial control supplies.
• Through-beam sensing provides reliable detection across varying target colours and surface finishes.
• 20 Hz switching frequency suits general industrial object and presence detection.
• 1/2-inch NPT cable entry provides a robust field-wiring arrangement.
• IP67 protection supports operation in dusty and wet industrial environments.

Key Features

• Carlo Gavazzi PMT series photoelectric sensor.
• Through-beam photoelectric receiver.
• 20 m maximum sensing distance.
• 880 nm modulated infrared light.
• Adjustable sensitivity.
• SPDT relay output.
• NO+NC change-over contacts.
• Selectable light/dark switching.
• 10.8–264 V DC supply range.
• 21.6–264 V AC supply range.
• 20 Hz switching frequency.
• 20 ms response time.
• Screw-terminal connection.
• 1/2-inch NPT cable entry.
• Rectangular industrial plastic housing.
• IP67 degree of protection.
• Operating temperature range of -25 to +55 °C.

Reliable 20 Metre Through-Beam Detection

Through-beam photoelectric sensing uses separate transmitter and receiver units installed opposite one another. The transmitter sends a modulated infrared beam towards the PMT20RI receiver, and an object is detected when it interrupts this optical path. Because detection does not rely on light being reflected from the target, through-beam technology provides dependable operation across long distances and with objects of varying colours, finishes and reflectivity.

The Carlo Gavazzi PMT20RI combines this sensing principle with a substantial 20 m operating distance, adjustable sensitivity and an SPDT relay output. Its exceptionally wide AC/DC supply range and field-wired NPT connection make it particularly useful for industrial installations requiring a robust sensor that can interface directly with control relays, PLC inputs and other automation equipment.

Typical Applications

• Industrial conveyors and material handling systems.
• Packaging and production machinery.
• Long-range object presence detection.
• Pallet, container and load detection.
• Warehouse and logistics automation.
• Product counting and monitoring systems.
• Automatic door and access systems.
• Assembly and manufacturing equipment.
• Detection across wide machinery openings.
• OEM automation and machine-building applications.