Belimo’s inline flow sensor utilizes transit-time ultrasonic technology with glycol compensation to provide accurate and repeatable flow measurements without drift in any HVAC application. A ‘fit and forget’ sensor to compensate variable and changing viscosities. The sensors rugged design with no moving parts, require no calibration and provides accurate, repeatable measurements improving the control and efficiency of HVAC systems. All flow sensors are wet calibrated to simulate field operation and available with NIST traceable calibration certificate.