Flow sensors for corrsive liquids

11/01/1998

Flow sensors for corrosive liquids

Series 106 Flo-Sensors measure very low flow rates from 15 ml/min to 10 l/min with ?1% accuracy. They have onlyTeflon and sapphire as wetted surfaces and can replace conventional glass tube and ball flow meters in applications where an electrical signal proportional to the flow rate is desirable. The sensors can even be used in very corrosive applications where the liquid is low in viscosity (<10 Centistokes). A Pelton-type turbine wheel determines the flow rate of the liquid being measured; the wheel`s rotation rate is linear over a large dynamic range. The electro-optical system consists of a diode emitting energy in the infrared spectrum. Light energy is alternately interrupted and passed by eight holes circumferentially located around the perimeter of the small tur- bine wheel. This "passed" light energy is detected by means of a photo-diode, and as the turbine wheel rotates in response to the flow rate, electrical pulses are generated. McMillan Co., Georgetown, TX; ph 512/863-0231, fax 512/863-0671, e-mail [email protected].