Activating automatic doors

Besam, available from Assa Abloy in South Africa, has a complete range of automatic door operators for sliding doors, curved sliding doors, swing doors, balance door systems and revolving doors.

The door operators are adapted to suit all applications from low use, lightweight doors suitable for the disabled, through to high activity equipment for airports, supermarkets, hospitals and the like.

To ensure that the automatic door operators meet their operating parameters, they are complemented by a wide range of activation units – from simple push buttons to sophisticated radars.

Each automatic door operator must be provided with activation units. These instruct the operator to open the door. Different doors and traffic situations require different activation units.

The activation units can be divided into two main types:

  • Automatic ones that are installed mainly for doors used by the general public, and
  • Manual ones for internal doors and for situations where people are acquainted with the premises.

It is also possible to combine two types for the same door.

A decisive factor in ensuring that automatic door operators work perfectly is the choice of activation unit. High quality activation units and door operators will avoid operational problems and achieve maximum efficiency from the entire automatic door system.

Combined presence and activation sensor for sliding doors

The sensor offers a high degree of safety. It detects the presence of people or objects close to the door and then prevents it from closing on somebody or something. The sensor is just as suitable for nursing homes and hospital corridors – where the requirements are for safety and reliability – as it is for department stores, banks, hotels and anywhere with high density traffic and difficult operating conditions.

Radar units

Radar units are available as motion or direction sensing. The radar unit acts as both transmitter and receiver and detects moving persons or moving objects. It operates with the microwave principle.

The Besam range of radar units also includes models which, when combined with a Besam micro-processor controlled door operator, can have their function constantly monitored. If any malfunction on the radar unit is detected, the door will open and stay open, ensuring a safe exit route.

Motion sensing radars activate the door when someone is moving inside the detection area, regardless of whether they are moving away from or towards the door. Direction-sensing radar is able to detect the direction of movement and will only open the door if a person is approaching.

Photocell units

Photocell units, working with modulated infra-red light, consist of one transmitter and one receiver. The photocells can be used as activation units for automatic doors or as presence detection units to prevent the door from closing.

Presence and activation sensors for swing doors

The Besam active infra-red presence and activation sensor improves the safety for the traffic around and through the automatic swing door. It makes sure that the door is opened automatically but, at the same time, it inhibits unwanted movement of the door. If an obstacle is detected during door opening, the door ceases its motion. If an obstacle is detected during door closing, the door will reopen.

The transmitter and receiver units are integrated inside the sensor. The transmitter emits a pulsating infrared (IR) light, invisible to the eye. The IR light is reflected against objects or persons in the detection zone. The reflected light is picked up by the receiver and converted into an electric signal, which then signals the control unit of the door operator.

Manual activation units

Sliding and swing doors can be manually operated with push buttons, elbow switches and key switches placed on the wall or pull cord switches fitted in the ceiling. When a person pushes the button, pulls the cord or turns the key, a signal is transmitted to the operator. The door then moves into the open position. It is closed automatically by an adjustable time delay or manually with the same actions.

Follow this link to download a detailed brochure, outlining exactly how each type of activation unit works, together with useful diagrams.

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