the pressure sensitive element 60 is compressed between the first and second compressible seals 50 and 70 and a pressure transmitting channel is formed by the second conduit 20 and the opening of the second compressible seal 70 between the first conduit 10 and the diaphragm portion 64 of the pressure sensitive element 60 it should be understood that fig1 is schematic in nature and intended to show the basic theory of operation of the present invention it should be noted that no bonding material is required to maintain the fluid integrity of the system this is important in applications of this type because many bonding materials are not likely to be approved by the federal food and drug administration for use with bodily fluids in processes of this type in addition the diameter of the second conduit 20 and of the opening in the second compressible seal 70 can be controlled and maintained relatively large compared to the length of the fluid passage defined by those openings in other words the vertical length of the second conduit 20 in fig1 need not be significant to perform its intended function because of this structure the vertical length of the passage defined by the second conduit 20 and the opening in the second compressible seal 70 need not be significant in relation to the diameter of the second conduit 20 and the opening of the second compressible seal 70 in other words the length of the fluid passage can be maintained at a dimension that is less than twice its width this significantly facilitates the ability to clean the device after its use with continued.