Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1987-07-09
1988-05-24
Orsino, Joseph A.
Communications: electrical
Condition responsive indicating system
Specific condition
340647, 174 11R, G08B 2100
Patent
active
047469110
ABSTRACT:
This invention relates to an alarm device for isolated pipe systems. The alarm device in accordance with the invention is characterized in that a transformer device (TR1) arranged to supply a signal from an oscillator (1) across a connection element (2) is connected across a connection point (7) to a media tube (9) surrounded by insulation (10) along which an alarm wire (8) 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 (2) via transformer device (TR1) and to sense this in a level sensing device (3), the output signal of which is applied for reference in a comparator device (4), whereby an alarm is arranged to be initiated at a level dependent on the resistance of the insulation (10) and a transformer device (TR2) is arranged for connection in series with the transformer device (TR1) via the alarm wire (8), so that part of the signal to the connection element ( 2) is applied for sensing in a level sensing device (5), the output signal of which is arranged to be applied for reference in a comparator device (6), and an alarm is then arranged to be initiated at a level dependent on the resistance in the alarm wire (8), the alarm wire (8) and the media tube (9) being galvanically separated from other measuring equipment and the alarm wire (8) being preferably in the form of a coil incorporated into the insulation (10) and surrounded by the media tube (9).
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Hofsass Jeffery A.
Orsino Joseph A.
Rune Helmersson
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