| 摘要 |
An ultrasonic gas leak detector of the kind where a detector transducer senses airborne acoustic ultrasonic sound waves emitted from a leakage in a gas installation is provided. The detector is provided with self-test means according to which an ultrasonic signal is emitted by a test transducer provided as an integral part of the detector, this signal being received by the detector transducer. By these means an ongoing self-test of the performance of the essential components of the detector, e.g. the detector transducer itself, the various electronic circuits of the detector, etc., can be carried out and an alert signal can for instance be transmitted to a central alarm system if inappropriate performance of the detector is discovered. The present detector can be specially designed for fixed installation in an explosion-endangered environment.
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