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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