Photocells and Photobeams are an integral part of Safety for any automated door or gate application. Essentially, they create a ‘magic eye’ either side of any entrance, and detect if there is an obstacle, ensuring the doors or gates do not close on a person or vehicle that remains in the passageway.
Photocells use infra-red light, invisible to the human eye. Most modern devices pulse the beam for a few milliseconds at a time to save power and increase range. Some photocells synchronize the transmitted pulses to prevent miss triggering from a nearby beam that is not syncronised. For test purposes, it is possible to view some infra-red emission using the camera facility on a mobile phone.
FA31 - 180deg Photocell Slimline Bi-Directional Photobeam
The FA31 is a single relay infrared photobeam working from 12v or 24v ac/dc.
The slim body ensures the beam can be placed at the very edge of the opening. The internal circuit boards can be set from +90 to -90 degrees, so are ideal for siting on the facing, rear or side edge of the door frame or gate post
FA33 - 180deg Photocell Slimline Bi-Directional Battery Photobeam
The FA33 is a single relay infrared battery photobeam.
The slim body ensures the beam can be placed at the very edge of the opening. The internal circuit boards can be set from +90 to -90 degrees, so are ideal for siting on the facing, rear or side edge of the door frame or gate post
IR1000/HD50 - Retro-reflective photobeam
Some applications have no facility for getting a cable to one side of the opening. Retro reflective photobeams shoot a beam from one side to a reflector on the other side.
Range is up to 10m, but alignment is critical for the longer distances. A 5m opening is relatively easy to protect. These photobeams can take from 12Vdc to 240Vac, and provide a volt free changeover output contact