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Capacitive Sensor for Plastic Detection

Capacitive Sensor for Plastic Detection
Details:
1. Ultra-thin and compact structure: Adopting a flat design, the thickness is significantly reduced, making it easy to integrate into space-constrained equipment (such as thin robotic arms and precision molds), without interfering with the original layout, suitable for the miniaturization and lightweight requirements of modern equipment

2. Fast response speed and no wear: No mechanical contact, achieving millisecond-level response, long lifespan, suitable for high-speed production lines or automation scenarios with frequent starts and stops, reducing maintenance requirements

3. Simple installation and no alignment required: Due to the use of inductive surface detection, there is no need for precise optical axis alignment like with through-beam photoelectric sensors, making installation and debugging simpler and faster, reducing assembly time and debugging difficulty

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Technical Parameters
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Application of capacitive sensor for plastic detection

 

Plastic is a non-metallic material that is often difficult to be recognized by metal sensors during the detection process. However, capacitive sensors are not affected by material composition, so they can accurately detect plastics, including transparent or semi transparent plastics.

On the production line, capacitive sensors can be used to detect the positioning and loading of plastic parts, and can monitor the position of plastic in real-time in high-speed and rapidly changing environments. In addition, capacitive sensors can also detect the flow of plastic during injection molding production, providing data support for improving the production process.

 

The difference between non buried capacitive sensors and buried capacitive sensors

 

1. Induction part

Non buried capacitive sensor: The protruding plastic head of the sensor can also sense objects on the side of the plastic head. If there is an object near the detected object at a close distance, it will also be sensed. This situation is not suitable for non buried capacitive sensors

Embedded capacitive sensor: The sensing part is flat, and the sensing position is on the end face

2. Sensing distance

Non buried capacitive sensors are relatively farther away, while buried capacitive sensors are relatively closer

 

Advantages of capacitive sensor for plastic detection

 

1. Non contact sensor, no wear and tear, long service life

2. High precision and good reliability

3. Suitable for detecting multiple objects

4. Can conduct remote measurements

 

Disadvantages of capacitive sensors

 

1. The problem of electromagnetic interference with the tested object

2. Sensitivity is affected by environmental temperature and humidity

 

FAQ

 

Q: What kind of factors determining the advantages, disadvantages, and sensing distance of capacitive sensor for plastic detection

A: Capacitive proximity sensors can detect large dielectric constants of targets. This makes it possible to detect materials in non-metallic containers, as liquids have much higher dielectric constants than containers, allowing sensors to see and detect liquids through the container. The working mode of capacitive proximity switches is the same as that of inductive proximity switches, but they have certain advantages compared to inductive proximity switches because they can detect or identify objects, while inductive proximity switches have strong limitations. They are not limited to conductors, but also include semiconductors, insulators, and even liquids or powders.

To achieve optimal operation, they should be used in an environment with relatively constant temperature and humidity. When dealing with non-conductive targets, there are three factors that determine the sensing distance:
1. The size of the effective surface of the sensor - the larger the sensing surface, the longer the sensing distance
2. The capacitance material properties of the target object, also known as the dielectric constant - the higher the constant, the longer the sensing distance
3. Surface area of the target object to be sensed - the larger the surface area, the longer the sensing distance

Other factors that have the least impact on sensing distance:
1. Temperature
2. Speed of the target object

 

Q: How to selection and detection of proximity sensors

A: At present, different types of proximity sensors should be selected for detectors of different materials and detection intervals to achieve high cost-effectiveness of the system. Therefore, the following criteria should be followed when choosing:
1. When the detection object is metal, a high-frequency oscillating proximity sensor should be used for the most flexible detection of iron nickel and A3 steel. The detection flexibility of aluminum, brass, and stainless steel detector bodies is relatively low.
2. When the test object is made of non-metallic materials such as wood, paper, plastic, glass, or water, a capacitive sensor for plastic detection should be used.
3. Optoelectronic proximity sensors or ultrasonic proximity sensors should be used for remote detection and control of metal and non-metal objects.
When the detector body is made of metal but the flexibility requirement is not high, low-cost magnetic proximity sensors or Hall type proximity sensors can be used.

 

 

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capacitive sensor for plastic detection
 

 

Model NPN NO GPC-16A8NO GPC-20A10NO GPC-30A08NO
NPN NC GPC-16A8NC GPC-20A10NC GPC-30A08NC
PNP NO GPC-16A8PO GPC-20410pC GPC-30A08PO
PNP NC GPC-16A8PC GPC-20A10PC GPC-30A08PC
Detection surface Upper end induction Upper end induction Upper end induction
Detection distance 2~8mm adjustable 2~10mm adjustable 2~8mm adjustable
Set distance 0~6.4mm 0~8mm 0~6.4mm
Standard detection object (iron) 18x8x1 mm 20x20x1mm 30x30x1mm
Detect objects Metal objects, non-metallic substances (plastic, glass, water, oil and other non-metallic materials)
Response frequency 100Hz
Differential frequency Less than 10% of the detection distance
Supply voltage 10~30V DC pulsation (P-P)10%max
Leakage current 0.8mA Below
Switch capacity 100mA
Control output Load current is less than 200mA (residual constant voltage is less than 1V)
Ambient temperature When operating: -25~+70°C When storing: -40~+85° (no freezing)
Ambient humidity During operation and saving: 35~95%RH
Protection level IP67

 

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