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No two sensing technologies are built the same and what you have will have unique capabilities which dictate the area it should be used at. Do not hope for the correct reading when you have a photoelectric sensor in an environment full of dust because that interferes with the receiver. The good news is that ultrasonic sensors will still give a correct reading when subjected to a dusty or dirty environment because even when the air is dusty of the sensing face is covered by dust the sound waves will still travel. You will need such a sensor especially if you are working in the packaging, food and beverage and the agriculture industry. It does not matter the field you are working in but rather getting the perfect ultrasonic sensor. Think about the modes available in the sensor before you complete the purchase. The common modes are retroreflective, thru-beam and diffuse. A lot of people will work with the diffuse mode just fine.
Once you ensure the modes are going to serve your objectives just fine, you need to move on to the housing. Housings vary in shapes, the material used to make them and even the size. To choose the appropriate housing for the ultrasonic sensor, think of the environment you will be commonly working at and the application of the sensor. Many of the housings will either be cylindrical, flat or just cubic. The main materials used to make the housings are plastic and metal. If you are looking for durability and you will not be working in the best environment, a metal housing is the right one for you. When you are working under favorable conditions, an ultrasonic sensor with a plastic housing will get the work done and there is no spending a lot of money in the purchase.
It is crucial to consider the output type because it has an effect on the kind of results you get. You can get a sensor with an analog output or switch point. Buy thinking about the job, you can know which output type will be preferable. The range of measurement of the sensor is something you should keep in mind too. The larger the transducer the larger the measurement ranger and vice versa. You should think about the cost of the sensor as well. Some people are too lazy to do research on the best ultrasonic sensors and transducers for their needs and just pick what is expensive assuming that it will give them the perfect experience but this is nothing more than ignorance because you can find less expensive ones that will do the best job ever. You may have to spend some time reading through reviews and finding information but in the end, you will make a pick that is not going to affect your budget and will get the job done.