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Pedestrian Gates > Control Mechanisms
control mechanisms
Our automatic gates can be interfaced with a variety of control systems,
from a simple manually operated push button to more sophisticated fully
automatic ultrasonic or autosensor devices. Connection to a customer’s
own bespoke control system, for example a fire alarm or computer system,
is also possible. Standard control mechanisms are described as below:
Photocell Eyes
Photocell eyes are a reliable and effective form of gate control. The
eyes act as a presence sensor, sending out a beam of invisible infrared
light directed at a reflective strip placed opposite the photocell eye.
1. First Front Eye
The first front eye is positioned 100mm above the finished floor level
in the upright post supporting the lead-in rails at a recommended
minimum of 1.2 metres from the gate body. When a person or object breaks
the invisible beam of light, the gate will open and close again after a
pre-set time delay. Should a person or object remain in the path of the
light beam, the gate will remain open.
2. Second Front Eye
Supplementing and operating in the same manner as the first front eye,
the second front eye is typically positioned on a cross rail close to
the gate body. If the gate begins to close before the customer has
passed it, activation of the second front eye will re-open it.
3. Six Eye Rear Safety Zone
The six eye rear safety zone is highly recommended and offers increased
safety for pedestrians in the path of the gate arm. If any one of the
six eye beams is broken, the gate arm stops moving. Detection of a
presence in the rear safety zone will override any other signals. The
gate will not function until the safety zone area is cleared of any
presence and a pre-set time delay has elapsed.
4. Reverse Action Eye
The reverse action eye is exclusively for use with reverse action gate
configurations, and is incorporated into the lead out barrier rail.
Reverse action gate configurations allow unrestricted flow in one
direction whilst inhibiting flow in the opposite direction. Upon
detection of an exit attempt in the restricted direction, the gate arm
closes and remains closed until the reverse action eye detects return
movement in the permitted direction, or the pre-set time delay elapses.
A minimum of 3 metres is required between the reverse action eye and the
gate body so that a person attempting to run out of the store may still
be stopped.
5. Push Button
A push button is the simplest means of controlling a gate. It can be
used in any application where direct control or monitoring of persons
through the gate is required.
6. Autosensors
Autosensors are generally used in applications where space is limited or
a more open environment is desired.
One internally mounted sensor is required per gate. Autosensors are only
able to detect movement and so cannot be used as a presence detector
i.e. in place of a safety detector. Each sensor is factory-set, but due
to the variable nature of each installation, it may be necessary to
alter the detection range on site. Care should be taken when positioning
an autosensor, as cross pedestrian traffic flow may lead to false
opening of the gate.
7. Ultrasonic Sensors
Ultrasonic sensors are presence detectors which can be used where it is
not desirable to use lead-out rails with a six pack rear safety. One
internally mounted sensor is required per gate. As the detection zone is
not visible, consideration must be given to ensure that it is kept free
of obstructions because this will prevent the gate from opening.
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