Photoelectric sensors generally have at least 9 kinds of sensing forms, use two light sources, there are three kinds of packages
Scale, more than five kinds of detection scale, and can use a variety of device methods, the combination of output and operating voltage to buy. This creates the confusing possibility of a wide variety of candidate sensors, making it difficult to choose.
Photoelectric sensor main parameters
â– Scale
â– Sensing form
â– Sensing scale
â– Installation method
Output
â– Operation form
â– Operating voltage
â– light source
â– Connection method
â– Package data
â– Special features include:
Can handle high speed and/or high temperature
·Logical control
·Computer programming
·Network compatibility
This kind of excess selection can be reduced in size by the following two methods: First, the test object needs to be considered; second, the operating environment of the sensor.
Packing
The first question we have to ask is: What do you want the sensor to detect after all? "Do we test the bottle or detect the carton?" said Greg Knutson, a sensor manufacturer at Sensor Engineering, a sensor manufacturer.
The optical properties and physical separation will determine which sensing form and which light source to use. For example, in the case of detecting a monochrome carton, it may be possible to select a cheap scattering sensor that reflects the light beam from the carton.
However, when the cartons are colored and the reflectance is different, the above solution cannot be selected. In this case, the best solution may be to use the opposite or reflective form of the sensor. In this scenario, the system works by shielding the beam. When the carton is in place, the light beam is blocked and the carton is detected. If there is no transparent box, this skill should be able to achieve reliable results. There are several types of sensors that can detect cartons of different heights.
Intervals play an important role in the selection of light sources such as LEDs or lasers. LED is cheaper, but because it is a light source with high scattering, it is suitable for short interval operation. The laser can be focused at one point so that the beam can be transmitted farther apart. Good aggregation is also important when fine features need to be detected. If you need to align fine features from a few feet away, you must use a laser.
Laser sensors are many times more expensive than LEDs, but this difference has now been reduced by the price drop of laser diodes. Although the lasers that are used today are still relatively expensive, they are now much less expensive than in the past.
Environmental challenges
Another factor in the selection of sensors is the operating environment. The operating environment in some industries (food and automotive industries, etc.) may be dirty or very risky, or both. When handling foods, humidity may be high and there are many liquids. Automobile factory workshops that handle engines or other parts may also have sand, lubricants, and coolants. In this case, the environmental adaptability of the sensor must be taken into account. If the sensor cannot adapt to the dust environment, it cannot be used. This consideration will also affect the scale of the test required, since it may be necessary to place the sensor in a more distant location than the harsh environment (rather than in the desired orientation). If the indicator light is dirty or the signal weakens, it is helpful to be able to automatically alert and notify.
Similar environmental issues can also affect the sensor's scale, and the scale can change from one finger to a larger than the open palm. Small-scale sensors are more expensive than large-scale sensors because of the higher cost of putting everything into a small space. Small-scale sensors collect light in smaller areas, have smaller inspections at a time, and have lower optical functions. These shortcomings must be overcome so that small-scale sensors can better match physical space.
For another example, sensors used in semiconductor cleanroom equipment must work in confined spaces despite the harsh working environment. The detection interval is usually a few inches, so the sensors are generally small. These sensors also often use optical fibers to direct light into (or out of) the detection zone.
Device and price
Another factor considered is the device system. Sensors often require box or other methods for mechanical maintenance. This kind of mechanical and optical maintenance costs may be higher than the cost of the sensor itself, so it is an important factor to consider when buying. If the manufacturer has a sensitive device system and a maintenance device arrangement for the sensor, the product is simpler to realize and has a longer life.
The price of laser and special photoelectric sensors is about 150-500 US dollars. Features such as primary packaging, standard optical functions, and limited (or no) external adjustments are all characteristics of each sensor's low-end products. And high-end products have advanced packaging (such as stainless steel or aluminum, etc.), high optical capabilities and adjustable gain, timing, or other options. Low-end products are suitable for general use, while high-end products can be used in special environments such as high-speed, high-temperature or explosive.
Finally, keep in mind that a sensory skill may not be able to meet all needs of use. If changes are required, a completely different sensor skill may be required. EdMyers, a sensor manufacturer and product manager at Pepperl+Fuchs, said that if vendors offer multiple sensor technologies within the same package and device scale, it is not difficult to switch to a new approach. If this is the case, then as the requirements change, it is easy to switch from one sensory skill to another.
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