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Tajuk : Pengesan Kapasitif Ciri-ciri Pengesan Cara-cara ia
berfungsi Fungsi setiap Blok Data Teknikal Penggunaan
Sorry……..
Semua Nota Pengajaran & Pembelajaran Saya dalam Bahasa Inggeris……………
Capacitive Capacitive SensorsSensors
• Almost Similar to the Inductive Sensor.
• Able to Detect Most Materials.
• Switching Distance Adjustable.
• Able to Detect Fluid Level Through the Wall of a Bottle.
Connection cable
Adjusting screw
LED indicator
Active surfaceActive electrodeEarth
electrode
Electrostatic field
Sensor is looking for a change in capacitance in the active field
Target
Sensor is adjusted so that it does not ‘see’ the wall of the vessel.
As the level rises the fluid affects the sensor field.
Until the sensor switches.
• Detection of Matt, Black Objects.
• Detecting Fluid Level, Wall Thickness Must be Limited.
• Monitoring the Winding of Electrical Wires and Cables.
1 - Power On Nothing Happens.Capacitance Created when Material Present.
2 - Analog to Binary Signal3 - To Check and Trigger a Signal4 - Output (LED)5 - Protection for Wrong
Connection6 - 24V In-coming7 - To Change to 5V8 - Active Switching Zone9 - Output Signal
Material Reduction Factor
All Metals
Water
Glass
Plastic
Cardboard
1.0
1.0
0.30 ~ 0.50
0.30 ~ 0.60
0.30 ~ 0.50
Wood
Oil
0.20 ~ 0.70
0.10 ~ 0.30
Operating voltage typ. 10 V … 30 V DCOr 20 … 250 V AC
Nominal switching distance typ. 5 … 20 mmmax. 60 mm (usually variable,adjustable via potentiometer)
Switching current max. 500 mA
Ambient operating temperature - 25 C … +70 C
Object material all materials withDielectric constant > 1
Sensitivity to dirt sensitive
Service life very long
Switching frequency up to 300 Hz
Design cylindrical, e.g. M18x1, M30x1,
up to 30mm, block-shaped
Protection class up to IP67
• Capacitive Sensors can be Easily Contaminated. Care should be Taken to Ensure Cleanliness.
• Can be used to Detect Objects Through Non-Metallic Walls of Not More than 4mm.
Sekian ……….FAHAM @ Buat-buat Faham ??? & Kalau TIDAK Faham….
Sila Rujuk Buku :- - Electronic
Devices- Sensor Application- Prinsip-prinsip elektronik
Prepared By :-
Encik Sarudin Bin Rohseli