3/31/2023 0 Comments Measuring cfm with anemometer![]() Sometimes used with gas chromatography systems, these instruments may be rated for use with flammable and explosive gases. Some flowmeters measure and monitor the flow of gases. 3 Simple Ways to Measure Air Flow Anemometers tell you air velocity. In the laboratory, hot-wire anemometers can be used to measure outside wind speed, air velocity, and temperature in hoods and enclosures, and slight gas movement in ductwork. The wire is cooled by the air flow and the known resistance of the metal is used to calculate the flow speed.Īlthough somewhat delicate, hot wire anemometers are used to study turbulent or rapid velocity fluctuation flows. Hot wire anemometers use an electrically heated wire to help calculate air speed. The fan speed is measured by a revolutions counter and converted to a wind speed measurement.ĭigital vane thermoanemometers may be pre-calibrated, traceable to NIST, and offer a choice of measurement units (ft./min., m/s, mph, km/hr., knots, CFM, and CMM). The mini-vane anemometer is the ideal tool to measuring airflow in a duct, across a heat exchanger or evaporator coil as required in the commissioning process. The axis of a vane anemometer is parallel to the wind direction (horizontal). This range provides an application limitation, since it needs a minimum air velocity to rotate the vane for an accurate reading. Vane anemometers are mechanical velocity instruments, often described as windmills or propellers. The CFM Wind Speed Gauge with eight blades and temperature sensor make it possible to know the ambient temperature in addition to measuring the wind speed. Vane anemometers provide an average measurement range from 50 to 6000 FPM. ![]() Anemometers to measure the speed of wind or a gas stream, and flowmeters to measure the flow rate of a liquid or gas available in a variety of configurations.
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