First, the selection of its primary consideration for the selection of three points: how wide the groove width should be; resolution (slit width); Fixation
1. The width of the slot, the detection object needs to pass through the slot of the trough optocoupler to block the infrared light, so the slot width of the photoelectric sensor should be wider than the detection object, and there should be a certain margin to facilitate the device.
2. The resolution of the grooved optocoupler, if the detection object is a toothed disc, the width of the tooth of the tooth is d, and the width of the tooth groove of the tooth groove is 3, then the width of the slit of the grooved optocoupler is required to be less than d and less than f, so as to ensure that the infrared light can be effectively blocked and conducted, and the groove optocoupler with a wide slit is selected under the above conditions.
3. There are two types of fork optocouplers: with fixed holes and without fixed air, which are selected according to the practical situation.
4. Device position. When the sensor is installed, the outer diameter of the detection tooth should be 1-2mm beyond the grooved optocoupler axis. This is useful in blocking the light.
Second, the selection of peripheral circuit parameters
1. When selecting the peripheral circuit of the fork optocoupler, first determine what the load resistance of the fork optocoupler receiving tube is, and then select the current of the infrared emitting tube according to the conversion power of the fork optocoupler.
2. The faster the movement speed of the measured object (such as 1-2kHz), in principle, the load resistance of the infrared receiving tube should be smaller.
3. What should I do if there is a problem with the photoelectric sensor in use? What can be done to reduce photoelectric sensor failures? This is a problem that many users will encounter when using photoelectric sensors, so how to deal with these problems, in fact, in daily life, pay more attention to the use of photoelectric sensors can reduce the occurrence of failures, the following small series to introduce the use of photoelectric sensors to pay attention to.
1. It is necessary to insist on parallel to the front end surface of the photoelectric sensor and the surface of the workpiece or object to be detected, so that the conversion power of the photoelectric sensor is high.
2. When the device is welded, the small interval between the root of the pin of the photoelectric sensor and the pad shall not be less than 5mm, otherwise the core will be easily damaged during welding. or cause a change in the function of the die. The welding moment should be less than 4 seconds.
3. The small detectable width of the through-beam photoelectric sensor is 80% of the width of the photoelectric switch lens.
4. When using inductive loads (such as lamps, motors, etc.), the transient impulse current is larger, which may deteriorate or damage the photoelectric sensor of the second line of communication.
5. The lens of the infrared photoelectric sensor can be scrubbed with lens paper, and it is forbidden to dilute solvents and other chemicals to avoid damaging the plastic mirror.
6. According to the user's on-site practice requirements, in some harsh conditions, such as dusty occasions, the sensitivity of the photoelectric sensor produced has increased by 50% to meet the requirements of extending the protection cycle of the photoelectric sensor in long-term use.
7. It is necessary for the photoelectric sensor to be installed in the place where there is no direct irradiation of strong light, because the infrared light in the strong light will affect the normal operation of the receiving tube.
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