Compressed air line leak detection unit has ultrasonic sensor and downconverter to audio frequency in single housing with analogue radio wireless transmission to earphones

摘要

A compressed air line leak detection unit (2) has an ultrasonic sensor (3) and downconverter (5) to audio frequency in a single housing (7) with selective signal filter (4) and analogue radio wireless transmission (8, 9) of the audio signals to a separate earphone transducer (6).