Pressure indicator
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Accused Products
Abstract
The invention provides an indicator for indicating a pressure difference. The indicator has a reference pressure chamber with two flexible wall parts being influenced to deflect upon pressures P1 and P2. The deflection of the wall parts changes a distance between each of the wall parts and an inflexible wall part of the chamber and by inspecting the difference, a pressure difference between P1 and P2 can be determined. To enable visual inspection, the chamber can be filled with an optically detectable fluid and one of the wall parts could be transparent to allow visual reading by determining a colour of the fluid layer below the transparent part.
9 Citations
26 Claims
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1-13. -13. (canceled)
- 14. A pressure indicator for indicating a pressure difference between a pressure P1 of a first chamber and a reference pressure, said indicator comprising a sealed pressure chamber having a sidewall with an inflexible first wall part arranged at a distance from a flexible second wall part, the pressure chamber being completely filled with a fluid at the reference pressure, the second wall part being arranged to separate the pressure chamber from the first chamber and to deflect upon a pressure difference between P1 and the reference pressure, said deflection changing the distance between the first and second wall parts thereby displacing the fluid in the pressure chamber, the indicator further comprising a flexible third wall part separating the pressure chamber from a second chamber, the second chamber holding a pressure P2, wherein the first wall part is substantially transparent to electromagnetic radiation within a specific wave length, and where the fluid is an incompressible liquid substance.
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25. An array of indicators comprising:
a plurality of indicators wherein each indicator indicates a pressure difference between a pressure P1 of a first chamber and a reference pressure, said each indicator comprises a sealed pressure chamber having a sidewall with an inflexible first wall part arranged at a distance from a flexible second wall part, the pressure chamber being completely filled with a fluid at the reference pressure, the second wall part being arranged to separate the pressure chamber from the first chamber and to deflect upon a pressure difference between P1 and the reference pressure, said deflection changing the distance between the first and second wall parts thereby displacing the fluid in the pressure chamber, the indicator further comprising a flexible third wall part separating the pressure chamber from a second chamber, the second chamber holding a pressure P2, wherein the first wall part is substantially transparent to electromagnetic radiation within a specific wave length, and where the fluid is an incompressible liquid substance; and
wherein said array is formed in a three layer structure comprising two glass layers arranged on each side of silicon layer.
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26. A pump with an inlet and an outlet, said pump comprising:
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an indicator for indicating a pressure difference between a pressure P1 of a first chamber and a reference pressure, said indicator comprising a sealed pressure chamber having a sidewall with an inflexible first wall part arranged at a distance from a flexible second wall part, the pressure chamber being completely filled with a fluid at the reference pressure, the second wall part being arranged to separate the pressure chamber from the first chamber and to deflect upon a pressure difference between P1 and the reference pressure, said deflection changing the distance between the first and second wall parts thereby displacing the fluid in the pressure chamber, the indicator further comprising a flexible third wall part separating the pressure chamber from a second chamber, the second chamber holding a pressure P2, wherein the first wall part is substantially transparent to electromagnetic radiation within a specific wave length, and where the fluid is an incompressible liquid substance;
wherein said pump is arranged with the first chamber in fluid communication with the inlet and the second chamber in fluid communication with the outlet to obtain indication of pressure difference between the inlet and the outlet of the pump.
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Specification