To detect the position of a transverse cylinder, which sensing arrangement is commonly used?

• A. Magnetic read switches
• B. Proximity switches
• C. Optical sensors
• D. Reed switches

Answer: (A)

Detecting the piston’s position in a transverse cylinder is typically done with a magnetic sensing setup. A magnet is mounted on the piston, and fixed magnetic read switches are placed along the cylinder or in its end caps. As the piston moves, the magnet’s field reaches the switches and they change state, giving a reliable signal that indicates end-of-stroke or intermediate positions. This non-contact arrangement is ideal for cylinders because it avoids wear on moving parts, works well in oily or dusty environments, and is easy to seal. You can place multiple switches at different locations to get several position cues. Optical sensors need a clear line of sight and can be fouled by oil, while proximity sensors require a target and may be less convenient in this setup, making magnetic read (reed) switches a simple, robust choice for cylinder position sensing.