![]() In other words, the accuracy of a thermal flowmeter calibrated for a given gas mixture will be degraded if the actual flowing gas has a different composition. Suppliers can provide appropriate calibration information for other gas mixtures, however the accuracy of the thermal flowmeter is dependent on the actual gas mixture being the same as the gas mixture used for calibration purposes. Due to this constraint, thermal flowmeters are commonly applied to measure the flow of pure gases. Therefore, it is important for the thermal flowmeter supplier to know the composition of the fluid so that the proper calibration factor can be used to determine the flow rate accurately. In these applications, varying composition of the fluid during actual operation can affect the thermal flow measurement. However, in many applications, the thermal properties of the fluid can be dependent upon fluid composition. In these applications where the thermal properties of the fluid are known and relatively constant during actual operation, thermal flowmeters can be used to measure the mass flow of the fluid because the thermal flow measurement is not dependent upon the pressure or temperature of the fluid. The thermal properties of the fluid can and do vary with pressure and temperature, however these variations are typically small in most applications. ![]() ![]() The amount of heat lost from the sensor is dependent upon the sensor design and the thermal properties of the fluid. Most thermal flowmeters are used to measure gas flows. The transmitter uses the heat input and temperature measurements to determine fluid flow. The amount of heat lost is sensed using temperature measurement(s) in the sensor. Some of this heat is lost to the flowing fluid. In a typical thermal flowmeter, a measured amount of heat is applied to the heater of the sensor. Thermal flowmeters use the thermal properties of the fluid to measure the flow of a fluid flowing in a pipe or duct. Please remember that Universal makes very specific products for utility water used in manufacturing, circulating lubrication, and industrial gas found on this site on the UFM products tab at the top of the page. Now that you know a possible technology to use, contact us to discuss your application. Variable Area (Float Style) for Clean Water.
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