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Thermal flowmeters can be divided into the following two categories: 1. Flowmeters that measure the rise in temperature of the fluid after a known amount of heat has been added to it. They can be called heat transfer flowmeters. 2. Flowmeters that measure the effect of the flowing fluid on a hot body. These instruments are sometimes called hot-wire probes or heated-thermopile flowmeters . Both types of flowmeters can be used to measure flow rates in terms of mass, which is a very desirable measurement, especially on gas service