Patent ID: 8783945

Claim:
A superheat sensor for sensing superheat of a fluid flowing in a flow channel, the sensor comprising: a diaphragm dividing an interior of a housing into an inner cavity with a charge fluid arranged therein and a part of the housing being directly fluidly connected to the fluid flowing in the flow channel, the diaphragm being adapted to conduct heat between the fluid in the flow channel and the charge fluid in the inner cavity, a first wall part of the diaphragm and a second wall part of the housing being arranged opposite each other at a variable distance from each other, said distance being defined by a differential pressure between the pressure of the charge fluid and the pressure of the fluid flowing in the flow channel, a distance sensor for measuring the distance between the first wall part of the diaphragm and the second wall part of the housing, the distance sensor comprising a first sensor part arranged on the first wall part of the diaphragm and a second sensor part arranged on the second wall part of the housing, and means for calculating the superheat of the fluid flowing in the flow channel, based on the measured distance.