PowerPoint PresentationSensors
Sensors
Sensors
Transmitter
Receiver
Sensors
Transmitter
Receiver
Sensors
Target
Sensors
Transmitter
Receiver
Sensors
Transmitter
Receiver
Sensors
Transmitter
Receiver
Sensors
Transmitter
Receiver
Sensors
Transmitter
Receiver
Sensors
Transmitter
Receiver
Sensors
Transmitter
Receiver
Sensors
Transmitter
Receiver
Sensors
Target
Long sensing distance: up to 30 metres with some devices
Will detect all but very transparent materials
Must be accurately aligned
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Not suitable for reflective or transparent targets
Target should be larger than the reflector
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Target
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Transmitter /Receiver
Sensing distance: much less than reflex type, actual distance depends on colour and reflective nature of the surface
Larger targets result in longer sensing distances
Not suitable for dirty environments
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Sensor
Oscillation
Amplitude
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ON
OFF
Target
Sensor
Oscillation
Amplitude
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ON
OFF
Target
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Oscillation
Amplitude
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ON
OFF
Target
Sensor
Oscillation
Amplitude
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ON
OFF
Target
Sensor
Oscillation
Amplitude
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ON
OFF
Target
Sensor
Oscillation
Amplitude
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ON
OFF
Target
Sensor
Oscillation
Amplitude
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ON
OFF
Target
Sensor
Oscillation
Amplitude
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ON
OFF
Target
Sensor
Oscillation
Amplitude
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Quoted distances are for mild steel
Sensor performance can be affected by:
Temperature
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24v
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24v
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Interference from other magnetic fields must be avoided.
If positioned in mid stroke, switching point will vary depending on direction of approach.
Maximum current must be limited to avoid burning of the reed contacts.
Reed switch
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Inductive principle of operation - but only reacts to magnetic fields
Interference from other magnetic fields must be avoided.
Solid state device - higher switching frequency - 1kHz
Inductive magnetic sensor
17.10.03 No. * / 91
Sensors
Sensors
Connection cable
Adjusting screw
LED indicator
Active surface
Active electrode
Earth electrode
Electrostatic field
Sensor is looking for a change in capacitance in the active field
Capacitive sensor
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Target
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Detects any material denser than air (as long as there is enough of it)
Can be adjusted for sensitivity
Can be affected by dusty environments
Capacitive sensor
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Sensor is adjusted so that it does not ‘see’ the wall of the vessel.
Capacitive sensor
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As the level rises the fluid affects the sensor field.
Capacitive sensor
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0 V
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0 V
Output
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0 V
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0 V
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0 V
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Quoted distances are for mild steel
Sensor performance can be affected by:-
Temperature
Sensors
(as long as there is enough of it)
Can be adjusted for sensitivity
Can be affected by dusty environments
Capacitive sensor
Sensors
Target
Long sensing distance : up to 30 metres with some devices
Will detect all but very transparent materials
Must be accurately aligned
Sensors
Not suitable for reflective or transparent targets
Target should be larger
Sensors
Transmitter / Receiver
Type : Diffuse
Sensing distance : much less than reflex type, actual distance depends on colour and reflective nature of the surface
Larger targets result in longer sensing distances
Not suitable for dirty
Sensors
Interference from other magnetic fields must be avoided.
If positioned in mid stroke, switching point will vary depending on direction of approach.
Maximum current must be limited to avoid burning of the reed contacts.
Reed switch
Sensors
Inductive principle of operation - but only reacts to magnetic fields
Interference from other magnetic fields must be avoided
Solid state device - higher switching frequency - 1kHz
Inductive magnetic sensor