| 摘要 |
The subject apparatus enables detecting changes in pressure of the fluid in a conduit from outside the conduit without disturbing the conduit or its function. The detection is made by sensing changes in diameter of the conduit caused by pressure changes, using a linear measurement electrical transducer. The transducer is mounted in a cylindrical sleeve which telescopes in a second sleeve which is externally threaded at both ends. A fixture is threaded onto one end with the sensing probe of the transducer extending through a hole in the fixture. An auxilliary sleeve is installed between the transducer support sleeve and the fixture, and also extends through the fixture and is forced toward the fixture by a compression spring between the transducer sleeve and auxilliary sleeve. A knurled knob is threaded onto the second sleeve and is used to adjust the position of the transducer along the axis of the sleeve. A saddle is detachably attached to the fixture with the conduit between the saddle and the auxilliary sleeve. The knurled knob is then adjusted to bring the probe of the transducer into contact with the conduit and set its output signal at a desired value. The spring loaded contact between the conduit and saddle and auxilliary sleeve stabilize the apparatus on the conduit. A variety of fixtures and saddles are provided to adapt the apparatus for use on conduits in a range of diameters while keeping the apparatus as compact as feasible.
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