Method for detecting and obtaining information about changes...

Details Method for detecting and obtaining information about changes... Method for detecting and obtaining information about changes...

G - Physics

01

R

340/106

G01R 31/08 (2006.01) G01M 3/18 (2006.01)

Patent

CA 1276254

ABSTRACT OF THE DISCLOSURE An improved method and apparatus for detecting and locating an event, i.e. a change in a variable, for example an increase in the concentration of a fluid as a result of a leak, a change in the physical position of a moveable member such as a valve, a change in tem- perature, or a change in pressure. The apparatus includes an elongate locating member to which connec- tion is made at the location of the event, an elongate source member which supplies current to the locating member through the connection which is made when an event occurs, and a return member to measure the voltage drop down the locating member. The apparatus includes means for ensuring that the apparatus does not signal an event if the impedance of the connection to the locating member is above a predetermined value. This eliminates false alarms resulting from circumstan- ces which result in high impedance connection between the locating and source members.

478820

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