Bircher LBDoor TB12 Miniature Light Barrier for Automatic Doors

Overview

What it is

LBDoor TB12 is a miniature one-way (through-beam) photoelectric sensor made of a separate transmitter and receiver. The electronics are fully encapsulated in a small button-style housing, so the pair can be hidden inside door frames and profiles.

What it is used for

Bircher lists closing edge monitoring on sliding and industrial doors, collision protection on revolving doors, restarting escalators from energy-saving mode and occupancy checks in security gates and turnstiles.

Key features

• Operating range 0 to 6 m with modulated 880 nm infrared light
• IP67 housing rated for -40 to +60 °C when fixed
• Narrow aperture (transmitter ±8°, receiver ±10°) so pairs can be mounted close together
• Response time 8 ms and test input that switches off the transmitter
• Insensitive to extraneous light up to 100,000 lux halogen (EN 60947-5-2)
• Red LED on the receiver for alignment and signal reserve

Buying considerations

Choose the output to match the door controller: NPN or PNP open collector, light-on (output when beam received) or dark-on (output when beam interrupted). The four order codes are TB12.N, TB12.D.N, TB12.P and TB12.D.P.

Installation considerations

Each device plugs into a 13 mm hole in sheet up to 3 mm thick. For a twin-beam arrangement with the same frequency, keep beams at least 20 cm apart and cross transmitters and receivers. Each unit has a 7 m PVC cable with a 3-pin JST plug.

Compatibility

Supply 10 to 30 V DC. The transistor output switches up to 30 V DC and 100 mA and is short-circuit and reverse polarity protected, suited to door controllers with an NPN or PNP sensor input.