Compressed Air Flow Meter, is the digital flow meter work for the air compressor. Air consumption is an important info for industrial inline gas flow pipe. According to the measurement conditions, compressed air flow meter could be different types. Thermal mass flow meters, Ultrasonic flow meters, Vortex flow meters, Turbine flow meters. And the differential pressure flow meters (Orifice plate ) are also suitable for compressed air. With the Pressure and Temperature compensation. Sino-Inst’s compressed air flow meters are more affordable and complete.
Featured Compressed Air Flow Meter
Compressed air flow meter working principle
There are a variety of measurement principles can be used to measure compresses gas.
Turbine gas meters are robust meters, used to measure gas consumption. In gas distribution, transmission, industrial plants and for commercial users. The meter tracks the flow rate continuously, offers little resistance to flow, and has a unique cartridge design that allows removal of all internal parts as one assembly.The meter also exhibits little sensitivity to gas density above two atmospheres pressure.The low inertia of the rotor and vee bearings, allows overhanging of the meter to twice its rated capacity, without damage for intermittent flow variations. Orifice plates and venturi tubes rely on detecting the differential pressure across a restriction in the pipe,and this pressure is directly proportional to the media velocity. Given knowledge of the pipe dimensions and media characteristics,a differential pressure instrument can give a reading directly in flow units. The accuracy of these systems are reliant on very fine tolerance machining of the orifice or venturi and the pressure drop incurred,through the installation of these devices may not suit all situations. These can be highly accurate and reliable but are expensive and complicated to install and maintain. Pitot tube systems work on a very similar principle and remove the issue of the pipe restriction,as there is only a small diameter tube inserted at right angles to the flow. These can be inserted through ball valves, making removal for service or calibration very simple. This method does not need perfectly dry and pure gases to be accurate,and is very tolerant of wet gases and contaminants which makes it ideal for measuring in difficult places. Such as compressor outlets. Vortex meters place a bluff restriction in the pipe,that causes vortices to form alternately on the 2 rear edges. Sensors are used to detect the formation of these vortices, the frequency of which is directly proportional to the flow rate. These instruments are accurate but again introduce a large restriction into the pipe,and are often employed on steam applications.
Extended Reading: Digital air flow meters
What about Thermal Mass?
Thermal mass meters and calorimetric flow sensors sense the cooling effect on a heated element,which is directly proportional to the mass flow rate rather than the volumetric flow rate. This removes the subsequent calculations needed to determine mass flow rate,using other methods of flow measurement, and there is no pressure or temperature compensation necessary.The actual sensing tips are small and thus the restriction placed,in the pipe produces very little back pressure, making this method ideal for very low and very high flow rates.Thermal mass meters are available in a range of accuracies and are ideal for dry, clean gas flow measurement. Some designs have all stainless steel wetted parts making them better suited to contaminated or corrosive gases,which would damage the exposed sensing elements of unprotected designs. They are not suitable for wet gases or steam. For those applications a pitot tube design or possibly a vortex meter would be the better choice. Thermal mass is also an excellent principle for use in flow switches,as there are no moving parts in the media and the sensor produces very little back pressure due to its minimal size. These flow switches are very sensitive and some models can be used to determine flow direction as well as flow/no flow.
Know More about Flow Meters
Gas mass flow meter
Gas mass flow meter, are the thermal mass flow meter, which is best choice for gas flow rate measurement. Based on the principle of thermal diffusion, Gas mass flow meter measure the flow rate of gas. Like: air flow, nitrogen, natural gas flow rate.
Digital water flow meters
Digital Water flow meter, means flow meter that can display water flow rate, and have the output for the flow rate. Like 4-20mA output, HART, RS 485, and so on.
Nitrogen flow meter
Nitrogen Flow Meter, is the flow meter that can measure the flow rate of nitrogen gas. Sino-Instrument is the nitrogen flow meter supplier in China. Vortex flow meter, is the common choice for gas flow rate inline measurement instrument. Like the air, nitrogen gas, steam, oxygen…..
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