week 8 1_introduction_to_electro_pneumatics
DESCRIPTION
hydraulic subtopicTRANSCRIPT
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Electro-pneumatic Combination of electrical and pneumatic system
Used when the process is repeating and setup cost is low
But
◦ Maintenance – troubleshooting is very complex
◦ Structure – circuit structure is messy when involving complex design
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Relay
◦ On/Off switch
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Solenoid
◦ Single valve solenoid Double valve solenoid
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Pneumatic Circuit Symbol Electrical Circuit Symbol
Y1
Y1 Y2Y1
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Didactic
Optical
Inductive
Reed Switch
Inductive Magnetic
Capacitive
Symbols
Connection
Proximity Sensors
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• Sensors that are able to detect the presence of nearby objects without any physical contact.
•A proximity sensor often emits:
1) Electromagnetic or electrostatic field
2) A beam of electromagnetic radiation (infrared, etc)
and looks for changes in the field or return signal.
•The object being sensed -> proximity sensor's target.
•Different proximity sensor targets demand different sensors:
Inductive proximity sensor -> metal target.
Capacitive sensor -> high density target
Photoelectric sensor -> reflective target
Proximity Sensors
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+18 ~ 30 Volts DC.
0 V
Output
Inductive
Capacitive
Optical
Magnetic
Ultrasonic
Normally open
Normally closed
Symbol
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Inductive Sensor
Inductive sensor is used to sense only metal type of object.
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ON
OFF
• Detects all conductive materials
• Best conductor is mild steel
• The sensor performance relies on temperature, the target material and its area.
Sensor
Oscillation Amplitude
Sensor output signal
Target Inductive Sensor
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ON
OFF
Sensor
Oscillation Amplitude
Sensor output signal
Target Inductive Sensor
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ON
OFF
Sensor
Oscillation Amplitude
Sensor output signal
Target Inductive Sensor
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ON
OFF
Sensor
Oscillation Amplitude
Sensor output signal
Target Inductive Sensor
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ON
OFF
Sensor
Oscillation Amplitude
Sensor output signal
Target Inductive Sensor
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ON
OFF
Sensor
Oscillation Amplitude
Sensor output signal
Target Inductive Sensor
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ON
OFF
Sensor
Oscillation Amplitude
Sensor output signal
Target Inductive Sensor
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ON
OFF
Sensor
Oscillation Amplitude
Sensor output signal
Target Inductive Sensor
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ON
OFF
Sensor
Oscillation Amplitude
Sensor output signal
Target Inductive Sensor
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ON
OFF
Sensor
Oscillation Amplitude
Sensor output signal
Target Inductive Sensor
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Capacitive Sensor
Capacitive sensor is used to sense only high density objects
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• Detects all materials with densities higher than air.
• Sensitivity is adjustable
• No suitable to use in dusty environments
Capacitive Sensor
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Target
Capacitive Sensor
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Capacitive Sensor
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Capacitive Sensor
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Capacitive Sensor
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Capacitive Sensor
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Capacitive Sensor
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Capacitive Sensor
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Optical Sensor
Optical sensor is used to sense only reflective type of object.
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Transmitter (T) / Receiver (R)
Optical Sensors
Type : Diffuse
• Detection distance: less than reflex type, actual distance depends on colour and surface smoothness
• Larger targets enables a longer detection distance
• No suitable in dirty environments
T
R
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Target
T
R
Transmitter (T) / Receiver (R)
Optical Sensors
Type : Diffuse
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T
R
Target
Transmitter (T) / Receiver (R)
Optical Sensors
Type : Diffuse
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T
R
Transmitter (T) / Receiver (R)
Optical Sensors
Type : Diffuse
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T
R
Transmitter (T) / Receiver (R)
Optical Sensors
Type : Diffuse
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T
R
Transmitter (T) / Receiver (R)
Optical Sensors
Type : Diffuse
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T
R
Transmitter (T) / Receiver (R)
Optical Sensors
Type : Diffuse