The sensors are glass-coated-platinum resistance detectors. The circuit heats the velocity sensor to a constant temperature differential above ambient temperature, and measures the cooling effect of the airflow, generating high accuracy and excellent low-viscosity sensitivity. Linear-analog output of the transducers is 0 to 5 Vdc or 4 to 20 mA for flows to 10,000 sfpm.
Omega Engineering Inc., One Omega Dr., Stamford, CT 06907, (203) 359-1660, omega.com