Tiny displacement/position sensors fit extremely confined spaces

IZAL series Linear Variable Differential Transformers (LVDTs) are extremely slim, inductive-displacement sensors that can precisely measure path length in highly confined spaces.  Although barely larger than a matchstick (the housing is 55 mm long with a 4-mm diameter), the sensors provide a complete differential measuring system with an unguided core and coils. 

Manufactured by Inelta Sensorsysteme, the contactless sensors are available with measuring ranges of 1, 2.5, and 5 mm, are linear to within ± 0.5% (optionally 0.25%), and have an operating temperature range of −25°C to 85°C (which can be extended upon request). Housings are made of nickel-plated steel (protection class IP65), making the sensor suitable for use in harsh and demanding environments. Each sensor comes with a 1-m cable (other lengths are optional), and custom versions with options such as individual calibrations are available on request. Units are now available in the U.S. through Hoffmann + Krippner Inc.