Historically the most popular selling housing style for an inductive proximity sensor has been the tubular style. The more popular sizes tend to be M8, M12, M18 and M30. Smaller tubular sizes of 3 mm, 4 mm, M5, and 6.5 mm are also available and have seen increased sales in the most recent years. One issue that may affect a tubular sensor’s application is its length. Most standard models are 50 mm to 65 mm long while some shorter body types may be in the 30mm range. What if your application requires 1.5 to 3 mm of sensing range, but you only have 10mm of depth to allow for the sensor? Try looking at a block or rectangular style inductive proximity sensor.