Proximity sensor selection and troubleshooting

For different material detectors and different detection distances, different types of proximity sensors should be used to make them have a high performance-price ratio in the system. This article will describe the principles to follow for sensor selection, the elements of the selection, and common troubleshooting.

The selection of proximity sensors should follow the following principles in the selection:

1. When the test object is made of metal material: The high-frequency oscillation type proximity sensor should be used. This type of proximity sensor is the most sensitive to the detection of iron-nickel and A3 steel samples. For aluminum, brass and stainless steel samples, the detection sensitivity is low.

2. When the test object is a non-metallic material: Capacitive proximity sensors such as wood, paper, plastic, glass and water should be used.

3. For long-distance detection and control of metal and non-metal: Photoelectric proximity sensor or ultrasonic proximity sensor should be used.

4. When detecting body metal but the sensitivity is not high: use a low-cost magnetic proximity sensor or Hall-type proximity sensor.

Elements of proximity sensor selection:

1 Detection type: amplifier built-in type, amplifier separated type;

2 Shape: round, square, groove type;

3 Detection distance: in mm;

4 Detection of objects: iron, steel, copper, aluminum, plastic, water, paper, etc.;

5 working power: DC, AC, AC and DC universal;

6 Output form: normally open (NO), normally closed (NC);

7 Output mode: two-wire, three-wire (NPN, PNP);

8 shielded, unshielded;

9 wire lead-out type, connector type, connector relay type;

10 Response frequency: several objects can be detected in one second

Common troubleshooting for proximity sensors

1 Stable power supply to the proximity sensor separately;

2 The response frequency is within the rated range;

3 There is jitter in the object detection process, resulting in exceeding the detection area;

4 multiple probes are tightly mounted to interfere with each other;

5 There are other objects in the test area around the sensor probe;

6 There are high-power devices around the proximity sensor and electrical interference.

Proximity sensors are widely used in machine tools, metallurgy, chemical, textile and printing industries. It can be used as a limit, counting, positioning control and automatic protection in the automatic control system. Proximity sensors have long service life, reliable operation, high repeatability, no mechanical wear, no spark, no noise, strong anti-vibration ability. At present, proximity sensors are becoming more widely used, and their own development and innovation speed is extremely rapid.

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