Thermal conductivity detector

摘要

A thermal conductivity detector of the type that uses an electrical bridge of four heaters with the fluid to be measured being exposed to a pair of heaters and the reference fluid being exposed to the other pair of heaters, wherein the invention improves upon this type of detector by having the fluid to be measured applied to a pair of parallel passageways in a block structure wherein a pair of heaters are contained and concurrently into bypass passageways which bypass the pair of heaters and then outputted through a common outlet; and wherein concurrently the reference fluid is applied to a pair of parallel passageways in another block structure wherein another pair of heaters are contained and concurrently to bypass passageways which bypass the second pair of heaters and then outputted through a common outlet and wherein the bypass passageways of one of the block structures are different in internal diameter from the bypass passageways in the other block structure. This invention enables rapid detection without being adversely affected by changes in quantities of fluid being measured.