Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1989-04-26
1989-11-07
Orsino, Joseph A.
Communications: electrical
Condition responsive indicating system
Specific condition
73 24, 73 405A, 324 585A, 340693, G08B 1710
Patent
active
048795461
ABSTRACT:
Hand-held apparatus for detecting presence of halogen refrigerant agents in air in which a pair of ultrasonic transducers are spaced from each other within a measurement probe and test air is continuously drawn between the transducers by a fan. One transducer is energized at constant ultrasonic frequency, and the other transducer is coupled to a rectifier or a phase detector for providing a measurement signal as a function of radiation received at and reflected by such other transducer. A reference signal level is established by selectively sampling and electronically storing of the measurement signal, such that the reference level is automatically or manually updated to reflect changes in ambient conditions. An audio/visual alarm is activated when the measurement signal departs from the ambient reference level by more than a preselected threshold.
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Bulla Don A.
Dunham Byron J.
Murray Gary P.
Jackson Jill D.
Kent-Moore Corporation
Orsino Joseph A.
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