Miniature photoelectric sensors provide similar performance to standard-size units in applications requiring high detection speeds, supplier Switchtec claims. The Infra MT sensor measures just 26 x 25.5 x 11mm and has programmable NPN/PNP outputs configured to be normally open or normally closed. A rotary trimmer fitted on top allows adjustment of sensitivity. Response and reset times are 2.5ms and 50ms respectively. An operating frequency up to 500Hz makes the sensors compatible with the fastest industrial processes.