![]() Straight tube Coriolis flowmeters can be employed where pressure drop is an issue. This type of flowmeter offers no obstruction to flow although the shape of the measuring tubes may create a small pressure loss. A true and accurate mass or volume reading is provided regardless of changes in gas characteristics. As density and viscosity of all gases are greatly affected by changes in temperature and pressure, the Coriolis flowmeter is a good choice when it comes to gas measurement. Probably the most expensive but the most accurate of the gas flow meters. Typical flow turndown is 30:1 with measuring errors of 1 to 2%. An integral, or remote mounted, LCD indicates flow rate and total and provides options of a pulse and/or 4-20mA output. This offers the advantage of a wide flow range with the added benefit of no moving parts. ATEX Approved versions are available for Hazardous Area installations. Calorimetric gas flow meters offer excellent accuracy and reliability at a very affordable price and on a short lead time too. 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, while also providing a scaled pulse and 4-20mA outputs. The flow sensor is calibrated whilst installed in the measuring section to ensure optimum accuracy and performance. Calorimetric FlowmetersĪre available from ¼” to 2” bore fitted into a stainless steel measuring section (spool piece) with threaded process connections. High and low speed pulse outputs are also provided with the option of 4-20mA output. The gas flow meters have a battery powered LCD which can display flow rate and total. Small bore sizes are manufactured in anodised aluminium, whilst larger units are available in ductile iron or carbon steel. Mechanical Air Meters (TERZ94)Īvailable from 25mm up to 600mm bore to handle flow rates from 2.5 m3/hr up to 2500 m3/hr. This is due to the fact that changes in working pressure effect air density and can therefore cause measuring errors. It is critical to know the precise working pressure when placing an order so the flowmeter can be scaled correctly. V/A flowmeters are available for flows as low as 1 cc/min up to 1500 m3/hr with accuracy 3 to 5 percent at best. Care must be taken with regard to not exceeding working pressure and temperature limits, particularly in the case of plastic tube units. Probably the least expensive and least accurate of all gas flow meters, but eminently suitable where a visual indication of flow is all that is required. Variable Area FlowmetersĪ simple ‘float in a tube’. Usually the application will limit the choice working pressure, temperature, flow range, required accuracy, price, is power available etc. Many flow technologies are available to accomplish the task. ![]() Flowquip offer a wide range of gas flow meters.
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