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Tag Archives: reed switch
In a previous post we took a look at magnetic field sensors vs inductive proximity sensors for robot grippers. In this post I am going to dive a little deeper into magnetic field sensors and compare two technologies: reed switches, … Continue reading
Here’s a real-world application where the reliability of the sensors is directly related to the reliability of the process in producing quality results. Pictured below is a pneumatic actuator for a vacuum valve. Inside the actuator, a magnetic ring is installed around the moving … Continue reading
There are numerous sensor technologies that can be used to provide liquid level feedback; ultrasonic sensors, capacitive sensors, and magnetic reed switches are but a few that spring to mind. For many, if not most, general liquid level applications, these … Continue reading
I received a call the other day from a customer who wanted to use a magnetic field sensor on a cylinder, and evidently was requiring very precise results. His aksed “what is the hysteresis of your sensors? I notice that it is listed in your catalog as a percentage and I need to know the exact value in millimeters.” My response was, “well it depends”, upon which he was not overly pleased. I then continued to explain my answer which leads me to the contents of this posting. Continue reading
Pneumatic cylinders are used in many applications as prime movers in machinery, material handling, assembly, robotics, medical, and the list could go on. One of the challenges facing OEM’s integrators and end users is to detect reliably whether the cylinder has been fully extended or retracted before allowing machine movement. Solutions include the use of inductive sensors with some sort of target and internally mounted magnet (by the cylinder manufacturer) on the cylinder piston. In my previous blog, I discussed the two primary magnets, axially and radially magnetized magnets, used by cylinder manufacturers. Now, we will review one of the most commonly used magnetic field sensors to detect extension and retraction of the cylinder…the well-known reed switch. Continue reading