Standard/Gas Purge Type - Brochure

This flowmeter is a kind of vortex flowmeters, which makes use of the regular and periodic characteristics of Karman vortex street. A thermistor sensor picks up changes in flow velocity that come with vortex shedding in the manner -changes in thermistor temperature —*changes in resistance value —* a train of pulses proportional to the flow velocity. In the gas purge type, changes in fluid velocity that come with vortex shedding are replaced by changes in fluid velocity of a purge gas (clean gas) introduced from an external source. Thanks to this arrangement, the thermistor sensor constantly remains in contact with clean, room temperature purge gas, permitting precise flow measurement of gases containing dust and mist, high or low temperature gases, or others previously thought difficult to be measured.