Photocells BFT THEA A15 O.PF — safety sensors for gate/door automation (MPN 21791)

BFT THEA A15 O.PF photocells are safety sensors designed for automation of gates, garage doors and industrial doors. Supplied as a pair, these non-contact infrared transmit-and-receive units create an invisible light barrier across moving openings. When the beam is interrupted by a person, vehicle or object, the connected control unit receives a signal to stop or reverse motion, reducing the risk of collisions and entrapment. The compact housings are intended for straightforward mounting beside an entrance and for integration with compatible BFT automation systems.

Advantages

These safety sensors provide reliable obstacle detection without physical contact, helping to protect people and vehicles. The paired transmitter and receiver arrangement ensures stable beam alignment and straightforward installation. Designed for gate and door automation, the photocells are compatible with standard BFT control units and can be used in a variety of residential and light-commercial applications. Their design supports consistent operation in normal outdoor conditions, reducing maintenance needs compared with mechanical safety devices.

Suitable for

• Automatic swing and sliding gates
• Garage doors and sectional doors
• Industrial doors and loading bay entrances
• Perimeter safety for pedestrian and vehicle access points

Key specifications

• Operation: infrared active beam transmitter and receiver pair
• Mounting: wall or upright post beside the opening (paired installation)
• Function: non-contact obstacle detection to trigger stop or reverse commands
• Compatibility: intended for integration with BFT gate and door control units
• Supply: delivered as a matched pair for emitter and receiver

How to use

Install the emitter and receiver on opposite sides of the opening at the same height and align them so the infrared beam is unobstructed across the travel path. Connect wiring to the automation control unit following the control unit’s wiring diagram and observe correct polarity and input type. After power-up, perform alignment checks and functional tests: interrupt the beam to confirm the control unit stops or reverses movement as configured. Periodically verify alignment and cleanliness of the optical windows to ensure reliable detection.

Usage recommendations

Place the photocells at a height and distance that match the typical objects to be detected, avoid mounting where direct sunlight or reflective surfaces can strike the sensors, and follow the manufacturer's integration guidelines for wiring and safety logic. Regularly inspect and clean the optical faces and re-check alignment after storms or impacts to maintain correct operation.