F - Mech Eng,Light,Heat,Weapons – 17 – D
Patent
F - Mech Eng,Light,Heat,Weapons
17
D
324/58.4
F17D 5/00 (2006.01) G01M 3/04 (2006.01) G01M 3/18 (2006.01)
Patent
CA 1219312
ABSTRACT OF THE DISCLOSURE Alarm device for isolated pipe systems, characterized in that a first transformer device arranged to supply a signal from an oscillator across a connection element is connected across a connection point to a media tube surrounded by insulation along which an alarm wire is applied and, in the event of a change in the insulation of the media tube, is arranged to affect the signal in the connection element across the first transformer device and to sense this in a level sensing device, the output signal of which is applied for reference in a comparator device, whereby an alarm is arranged to be initiated at a level dependent on the resist- ance of the insulation and a second transformer device is arranged for connection in series with the first transformer device via the alarm wire, so that part of the signal to the connection element is applied for sensing in a level sensing device, the output signal of which is arranged to be applied for reference in a comparator device, and an alarm is then arranged to be initiated at a level dependent on the resistance in the alarm wire, the alarm wire and media tube being galvanically separated from other measuring equipment.
465279
Gowling Lafleur Henderson Llp
Helmersson Rune
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