Air is probably the easiest of all gases to meter and, consequently, many air meters are available to accomplish the task. Usually the air flow meters application will affect the choice working pressure, temperature, flow range, required accuracy, price and whether power is available.
To discuss your application, call us on 01422 829920 or send us a quick enquiry.
Variable Area Flowmeters are the least expensive option for compressed air measurement. They are ideal when high accuracy isn't needed and a visual indication of flow suffices. These meters handle flows from 5 cc/min to 1500 m³/hr with 3-5% accuracy. Be mindful of working pressure and temperature limits, especially for plastic tube units. Precise working pressure is crucial for correct scaling, as changes affect air density and can cause errors.
Thermal Mass Flowmeters come in sizes from ¼” to 2” bore, installed in a stainless steel measuring section with threaded connections. Calibration occurs during installation for optimal accuracy. They feature an integral display showing flow rate and total in various units, plus scaled pulse and 4-20mA outputs. For pipes larger than 2”, a hot-tap insertion version with flanged options is available. These meters offer a wide flow range with 1.5-2% accuracy and are affordable with short lead times. Flowquip’s VA520 model provides high accuracy due to its defined measuring section.
Vortex Flowmeters offer a wide flow range and have no moving parts. They include an integral or remote LCD display indicating flow rate and total, with pulse and/or 4-20mA output options. Typical flow turndown is 30:1 with 1-2% accuracy.
Coriolis Flowmeters are the most accurate option for compressed air measurement. They provide true mass or volume readings regardless of changes in gas characteristics. These meters have no obstruction to flow, though the shape of the measuring tubes may cause a small pressure loss. Straight tube versions can be used where pressure drop is a concern. They achieve better than 0.5% accuracy over a wide flow range.
you wish to hire a meter for air flow measurement, this can be done through our sister company Flowhire Ltd.
