US 8,508,375 B2Granted

Comparative pressure monitoring instrument

AssigneeStructural Monitoring Systems Ltd.

InventorsNigel Laxton, Henry Kroker

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Abstract

A comparative pressure monitoring instrument (10) houses a switch (14) having first and second ports (18) and (20), and a high flow impedance 16. The ports (18) and (20) are in fluidal communication with a first pressure source (72) and a second pressure source (82) respectively. The impedance (16) is coupled (i.e. shunted) across the switch ports (18) and (20) and the first and second pressure sources (72, 82). The switch (14) switches between a first state characterised by a pressure differential across the impedance (16) being less than a preset level and a second state characterised by the pressure differential across the impedance (16) being equal to or greater than the preset difference. Any difference in pressure between the sources (72) and (82) will cause an air/gas flow through the impedance (16) and thus a pressure drop across the impedance (16).

Claims21

Dependent claims

A comparative pressure monitoring instrument comprising:

a housing;
a switch disposed in the housing and having a first switch port and a second switch port;
a first conduit extending from the first switch port and through the housing, the first conduit arranged to enable fluidic coupling between the first port and a first pressure source external of the housing;
a second conduit extending from the second switch port and through the housing, the second conduit arranged to enable fluidic coupling between the second port and a second pressure source external of the housing;
a high fluid flow impedance disposed in the housing and coupled across the first and second conduits;
the switch being arranged to switch between a first state and a second state, the first state characterised by a pressure differential across the high fluid flow impedance being less than a preset difference and the second state being characterised by the pressure differential being equal to or greater than the preset difference.

3 more elements

Dependencies are inferred from the claim text.