Patent ID: 8394051

Claim:
A device for detecting pressure and/or temperature changes in a fluid-channel, comprising: a main duct with an inlet and an outlet; a branch ductwork with a first branch end branching off the main duct downwards the inlet and with a second branch end discharging into the main duct upwards the outlet; and at least one dead-end channel with a first end that branches off the branch ductwork and a second closed end, wherein the at least one dead-end channel traps a gas bubble within the dead-end channel when the device is primed or filled with a liquid fluid, wherein the gas bubble changes its size or position if a change in pressure or temperature occurs in the device, wherein the branch ductwork prevents an expanding gas bubble from escaping into the main duct; and wherein the liquid fluid is divided into a two part-flow comprising a first part flow and a second part flow, wherein the first part flow flows through the main duct and wherein the second part flow flows through the branch ductwork.