It’s 3:00 AM and your machine has come to a screeching halt because, according to your PLC, the cylinder that holds a part in place is neither extended nor retracted. After looking at the cylinder, you see it is extended just as it should be however; the cylinder-mounted sensor is not detecting the magnet. No problem, you have another magnetic field sensor that will fit but it does not work either, so what is the problem? Another bad sensor? Maybe not, it could be the sensor and the magnet is incompatible.
Many sensors used in industrial automation applications – linear position sensors and long-range distance sensors being two of the most common types – produce an analog output that is representative of the position or distance being measured.
Difficult targets and unique application requirements call for specialized sensing technology. When over-the-counter medication producers and packaged food manufacturers were faced with the challenge of coming up with a response to concerns about protecting consumers from potential tampering, they turned to modern luminescence sensor technology.
Written by: Jeff Himes
From some of the previous blogs, it has been indicated that a number of variables can affect the actual sensing range achieved by an inductive proximity sensor. One of those variables mentioned was target composition or target material. Let’s review how various target materials can affect an inductive sensor’s performance.
If you aren’t familiar with the NFPA, here is a brief summary from their website:
“The mission of the international nonprofit NFPA, established in 1896, is to reduce the worldwide burden of fire and other hazards on the quality of life by providing and advocating consensus codes and standards, research,training, and education.” http://www.nfpa.org/
Written by: Bjoern Schaefer
Scott’s article on analog resolution provides a great understanding of analog signal evaluation, which I’d like to expand on with a brief summary about typical performance criteria of linear measurement systems.
Many distance measurement sensors – regardless of the front-end sensing technology employed – deliver an analog output such as 0-10V or 4-20mA. A key parameter to understand for any distance measurement sensor is the output resolution. In a position measurement system, resolution is defined as:
Selecting an industrial sensor can be a daunting task. With so many different sensing technologies and the endless variety of products in the market, how is it possible to find that one ideal sensor for any given application?
Turns out, it’s not really so much a process of selecting the right sensor…it’s really about eliminating all the wrong choices. Selecting a sensor is a process of asking a series of questions to eliminate any technology or product that doesn’t fit the application requirements. For example: