With the emergence and development of microelectronics technology, optoelectronic semiconductor technology, optical fiber technology and grating technology, the types of photoelectric sensors are increasing, and photoelectric sensors are increasingly used. With its own irreplaceable superiority, photoelectric sensors are widely used in the field of automation. The physical basis of photoelectric sensors is the photoelectric effect, it is composed of photoelectric materials devices, both for the detection of non-electricity directly caused by changes in the amount of light, but also can be used to detect other non-electricity can be converted into changes in the amount of light. In addition, the photoelectric sensor also has non-contact measurement, fast response, reliable performance and other characteristics, so it is widely used in all walks of life. In order to make everyone better use of photoelectric sensors, today we will make the corresponding solutions to the common failure problems of photoelectric sensors. Facilitate everyone in the daily use of photoelectric sensors themselves can do the basic troubleshooting and maintenance work of photoelectric sensors.

Many users in the use of photoelectric sensor for the sensor does not show the signal, detection of objects or false detection phenomenon and other problems, usually will be directly determined to be the photoelectric sensor is bad reason. But in fact, there are many factors that affect it, next I will analyze it for you.

1. Check the sensor connection problem.
Photoelectric sensors are generally divided into transmitter and receiver, both ends need to be connected to the power supply in order to normal use. If it is reflective photoelectric sensor and diffuse reflection photoelectric sensor, their emitter receiver for one, only need to connect this end to the power supply can be used normally. Sensors connected to the power supply wire is generally divided into 3 cores or 5 cores, and different colors to distinguish the different functions they represent. Therefore, when connecting the power supply must be careful not to connect the power cord wrong, otherwise there is a high probability that the sensor will not work. It is recommended that you check the product manual in detail when connecting the power supply and connect the power cable according to the operating instructions.
Next, the sensor must be provided with a stable power supply. If the DC power supply must confirm whether the positive and negative terminals are connected correctly, if the wrong connection will also lead to no output signal from the sensor.

2. Check the configuration of the sensor.

Because of the accuracy of the speed gate detection and the characteristics of fast pedestrian flow, usually use the pair of photoelectric sensors. A pair of normal pair of sensors is divided into transmitter and receiver. Their appearance is similar so and it can easily happen that customers use two emitters or two pairs of opposite emitters as a pair of normal sensors. However, in this configuration, the sensor simply cannot perform detection or present an output signal. The solution is also simple, always make sure that your sensors are mounted face-to-face for one transmitter and one receiver respectively. Usually the sensor manufacturer in order to distinguish between the transmitter and receiver will be clearly marked at the product housing or label, the specific can read the instructions and then operate.

3. Detection of size mismatch problems.

If there is no signal response to the detection object, first of all, you can check whether the detection object meets the standard object or minimum detection object standard of the photoelectric sensor. Minimum detection object standard is based on the photoelectric sensor spot size to determine. If the detection of the object range is less than the range of the sensor spot, at this moment the object is in the detection blind area, so the photoelectric sensor will not issue induction signal.

4. Consider environmental factors interference.
Photoelectric sensors are optical sensors, so they work with light. Because of this, the sensors are highly dependent on the ability to receive emitted light. If the light intensity exceeds the rated range or the field application environment is too dusty may affect the sensor's ability to receive. Therefore, when selecting a product, choose a photoelectric sensor with high light resistance, or avoid exposing the product to bright light. In the daily maintenance of the product need to pay attention to clean the lens surface of the sensor to avoid the accumulation of dust on the lens to affect the light emission reception. In addition, there is another factor that has a greater impact is the electrical interference factor. When multiple sensors are closely installed or the product is surrounded by high-powered equipment, will generate interference with each other, it will lead to the product does not respond to the problem. So in the process of use must pay attention to exclude the above problems.

I hope the above information can help you understand the common failures and solutions of photoelectric sensors in road gates. If you want to know more about the application of infrared photoelectric sensors, you can also contact us by email. G-TEK has 20 years of experience in the infrared photoelectric sensor industry, and insists on providing the most suitable and reliable photoelectric sensor solutions for our customers.