Belimo’s New Ultrasonic Flow Sensors with Glycol Compensation

‘Fit and forget’ sensors to compensate variable and changing viscosities. The sensors have a rugged design with no moving parts, require no calibration, and provide accurate, repeatable measurements improving the control and efficiency of HVAC systems

Belimo releases new inline flow sensors sizes 2½ to 6” that offer automatic glycol measurement and compensation for optimal system performance. Trusted flow measurement is essential in maximizing HVAC system efficiency and ensuring occupant comfort. Belimo flow sensors utilize ultrasonic technology with glycol compensation to provide accurate and repeatable flow measurements of water and water/glycol mixtures without drift in any HVAC application.

The Belimo flow sensors use two offset transducers (refer to Figure 1) to determine the flow velocity by measuring the speed of sound in the heat transfer fluid. The downstream transit time is measured by passing an ultrasonic pulse from the lower transducer to the upper transducer; the process is then reversed to obtain the upstream time. Transit times differ based on the flow through the sensor tube; the downstream pulse is accelerated, the upstream pulse is impeded and slowed. The ultrasound pulses with the fluid temperature can be used to calculate the kinematic velocity (𝑣𝑚𝑒𝑎𝑠) and determine the measured volumetric flow.



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The flow sensors have a patented automatic glycol compensation algorithm that selects the correct fluid properties for the flow and energy calculation eliminating manual input of glycol percentage for sensor setup. The algorithm can be applied to a range of heat transfer fluids, ensuring accurate and repeatable measurements. The automatic glycol concentration minimizes drift and provides trusted flow measurement by continuously compensating glycol concentration in a hydronic system.

The Belimo inline flow sensors are an advancement in thermal energy with ultrasonic transit-time technology that automatically measures and compensates glycol concentration. ‘Fit and forget’ sensors to compensate variable and changing viscosities. The sensors have a rugged design with no moving parts, require no calibration, and provide 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 certification. The 2½” to 6” flow sensors now complete the FM series flow sensor offering.

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Additional Resources 

■  Ultrasonic Flow Sensors
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■  Training
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