Semiconductor sensor for smoke, combustible gas and vapour detection

The semiconductor sensor is connected on one side to a variable source of stabilised voltage, and on the side to a variable source of constant current. The voltage source may be derived from any supply either of DC voltage or of rectified AC voltage. The variation of output from the sensor, in respo...

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Bibliographic Details
Main Authors HAVRYLUK, JIRI, VACLAVICEK, FRANTISEK, KASPAR, JIRI, MICHAL, JAN, HANUS, PETR
Format Patent
LanguageEnglish
German
Published 28.02.1989
Edition4
Subjects
ALARM SYSTEMS
INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES
MEASURING
ORDER TELEGRAPHS
PHYSICS
SIGNALLING
SIGNALLING OR CALLING SYSTEMS
TESTING
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Summary:The semiconductor sensor is connected on one side to a variable source of stabilised voltage, and on the side to a variable source of constant current. The voltage source may be derived from any supply either of DC voltage or of rectified AC voltage. The variation of output from the sensor, in response to changes in concn. of smoke or vapour, may be measured either directly or after suitable processing. Voltage vs. concn. curves are presented for coal gas and natural methane, showing the range of adjustement of sensitivity in both instances.
Bibliography:Application Number: CH19850003833