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EN. MUHAMAD NABIL BIN MANSOR
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Proximity Sensor
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Direct Reflection - emitter and receiver are housed together and use
the light reflected directly off the object for detection. In the use of
these photocells, it is important to bear in mind the color and the typeof surface of the object. With opaque surfaces, the sensing distance is
affected by the color of the object. Light colors correspond to the
maximum distances and vice versa. In the case of shiny objects, the
effect of the surface is more important than the color. The sensing
distance in the technical data is related to matte white paper.
Operating Principles For Photoelectric Sensors
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Reflection with Reflector- emitter and receiver are housed togetherand requires a reflector. An object is detected when it interrupts the
light beam between the sensor and reflector. These photocells allow
longer sensing distances, as the rays emitted are almost totally reflected
towards the receiver.
Operating Principles For Photoelectric Sensors
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Polarized Reflection with Reflector- similar to Reflection with Reflector,
these photocells use an anti-reflex device. The use of such adevice, which bases its functioning on a polarized band of light, offers
considerable advantages and secure readings even when the object to
be sensed has a very shiny surface. They are not in the technical data
affected by random reflections.
Operating Principles For Photoelectric Sensors
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Thru Beam - emitter and receiver are housed separately and detect an object
when it interrupts the light beam between the emitter
and receiver. These photocells allow for the longest distances.
Operating Principles For Photoelectric Sensors
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Operating Principles For Photoelectric Sensors
Light On / Dark On Types Of Output: For the photocell, the same terminology
as inductive and capacitive sensors is used: NO =
normally open, NC = normally closed. This refers to the state of the unit in the
absence of the product to be sensed. In the case of
photocells, light on / dark on is used. In the case of the direct reflection types,
NO is light on and NC is dark on. For the other
types, NO is dark on and NC is light on.
Sensing Distance (Sn): The space in which it is possible to sense an object. In
the case of direct reflection types, it is the maximum
distance between the photocell and the object. In the case of reflector or barrier
types, it is the distance between the unit andthe reflector or between units.
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Operating Principles For Photoelectric Sensors
Power Supply: The supply voltage range that sensor will operate at.
Power On Delay: This is the time lapse between providing power and the
operation of the output. This is to avoid unwanted
switching when the unit is powered.
Power Drain: The amount of current required to operate a sensor.
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Operating Principles For Photoelectric Sensors
Voltage Drop: The voltage drop across a sensor when driving the maximum
load.
Switching Current (Max): The amount of continuous current allowed to flow
through the sensor without causing damage to the sensor. It is given as a
maximum value.
Short Circuit Protection: Protection against damage to a sensor if the load
becomes shorted.
Operating Frequency: The maximum number of on/off cycles that the device is
capable of in one second. According to EN 50010.
Light Immunity: The maximum limit of an incandescent light or sunlight. Beyond
this limit, the photocell may not work correctly due to interference on the receiver.
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i i
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P i i S
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P i i S
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P i it S
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P i it S
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P i it S
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P i it S
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P i it S
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Sensor Symbol
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Sensor Symbol
Proximity Sensor
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Connection
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Connection
Connection
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Proximity Sensor at Sensor Technology Trainer
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Inductive Capacitive Optical
Magnetic Magnetic Limit Switch
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