[A thermal flow sensor for infusion technique]

A flow sensor for measuring flow rates in infusions systems, which is thus suitable for infusion monitoring, is described. The sensor employs a combination of thermal heating and thermal tracing to determine the flow rate. Heating and sensing elements are applied to the outside of the infusion tubing, so that measurement does not compromise the integrity of the tubing. Through the use of two sensor units measurement can be made independently of position.