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Bionetics Rheotherm - Thermal Duct Flow Meters for Air & Gas
Rheotherm flow sensing probes for duct gases are easy to install and provide long-term service with little or no maintenance. These thermal mass flow meters monitor stack gas, digester gas and vent air. The output can be in mass, standard volume or velocity units. Our thermal mass flow meters are designed for easy installation and provide years of maintenance-free service. Options for hazardous locations (intrinsically safe/explosion-proof) are available.
Air and most other non-condensing gases, including corrosive and explosive gases. The stainless steel construction and lack of moving parts make it ideal for rugged industrial environments. Common uses include vent air, stack gas and digester gas. The application section has a complete list of fluids. Contact Us about any application you have or use the form on this page.
These are insertion probe flow sensors that install through the pipe or duct wall. Typical line connections are 1” NPT, but flange, hot tap and sanitary fittings are available. The probes can be installed in horizontal or vertical pipes. With some models the electronics are integral to the sensor, and other models have a separate electronics enclosure to install, up to 200 feet from the sensor. Electronics Options.
Typical calibration ranges are 10:1 (options up to 200:1), with good accuracy over the entire range. The sensors cannot be damaged by overranging.
Our insertion flow sensors have a shaft with two stainless steel flow sensing tips. One tip has a heated RTD in it and the other an unheated RTD. The temperature differential between the two RTDs provides the primary flow signal. At high flow rates, flow removes more heat resulting in a lower differential. At low flow rates, flow removes less heat so the differential is higher. Nothing touches the gas but the metal probe
The historically reliable Rheotherm flow meter for duct flow measurement is available with a revolutionary sensor head which eliminates off-axis error common to other sensors. The system measures true mass flow rate in turbulent ducts and pipes using our standard gas flow probe design with the Rheovec sensor head added. Rheovec literature (PDF)
- No moving parts
- Advanced signal processing electronics
- Field adjustable
- Maintenance-free
- Easy installation
- Choice of wetted materials
- Long-term reliability
