Communications: electrical – Condition responsive indicating system – With particular coupling link
Patent
1997-08-08
1998-11-17
Hofsass, Jeffery A.
Communications: electrical
Condition responsive indicating system
With particular coupling link
340550, 340566, 340552, 340515, G08B 108
Patent
active
058382313
ABSTRACT:
A monitoring device for detecting acoustic vibrations in monitored objects has a plurality of several structure-borne sound sensors which are connected to a remote central electronic analyzing system. The individual structure-borne sound sensors are each acoustically coupled with a self-testing unit, which can be activated from the central electronic analyzing system. Activation of the self-testing units is performed by modulation of an operating voltage supplied to structure-borne sound sensors, without additional electric connections to the electronic analysis system.
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Brochure: "Korperschallmeldeanlage" (Body Sound Recording Device) VF 41; Cerberus Ristow, 1994. No.
"Lokales Sicherheits Netzwork in Gefahrenmeldeanlagen, Teil 2" (Local Security Network in Danger Recording Devices, Part 2); Telenorma, Bosch Telecom, Mar., 1974. No.
Hofsass Jeffery A.
Huang Sihong
Senstar-Stellar Corporation
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