Typical flow turndown is 30:1 with measuring errors of 1 to 2%.Ĭoriolis Flow meters are a more expensive option for compressed air measurement, but the most accurate of all air flow meters. An integral, or remote mounted, LCD indicates flow rate and total and provides options of a pulse and/or 4-20mA output. Vortex Flowmeters offer the advantage of a wide flow range with the added benefit of no moving parts. Flowquip’s VA520 Air Flow Meter provides an affordable option and offers high accuracy due to the defined measuring section. Thermal Mass flow meters offer excellent accuracy and reliability at a very affordable price and are available on a short lead time. This flowmeter provides a very wide operating flow range with a measuring error of 1.5 to 2%. For pipe installations greater than 2”, a hot-tap insertion version is available with flanged spool piece options. An integral display shows flow rate and total in various volumetric or mass engineering units, and also provides a scaled pulse and 4-20mA outputs. The flow sensor is calibrated whilst being installed in the measuring section to ensure optimum accuracy and performance of air flow meters. Thermal Mass flow meters are available from ¼” to 2” bore, fitted into a stainless steel measuring section (spool piece) with threaded process connections. Change in working pressure effect air density and can cause measuring errors. ![]() It is critical to know the precise working pressure when placing an order so the flow meter can be scaled correctly. These air flow meters are available for flows as low as 5 cc/min up to 1500 m3/hr with accuracy 3 to 5% at best. Care must be taken to not exceed working pressure and temperature limits, particularly in the case of plastic tube units. Variable Area flowmeters are probably the least expensive option for compressed air measurement and particularly choice if high accuracy is not a priority – they are eminently suitable where a visual indication of flow is all that is required. ![]() Usually the air flow meters application will affect the choice working pressure, temperature, flow range, required accuracy, price and whether power is available. Air is probably the easiest of all gases to meter and, consequently, many air meters are available to accomplish the task.
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