There are two conditions for small flow measurement. One is to measure vapors or liquids passing through fine pipes with high precision.The other is fluid mechanical flow, which measures very slow flow.There are many kinds of common gas flowmeters suitable for measuring fine flow, such as differential pressure type, oil level sensor type, vortex type, fast heat type, etc., in which some gas flowmeters are suitable for measuring medium, large flow rate, also suitable for measuring fine flow rate, while others are designed for measuring fine flow rate.
What are the common low-flow gas flowmeters
What does a universal low flow gas flowmeter have
1. Differential pressure flowmeter.The key of differential pressure flowmeter is hidden orifice differential pressure flowmeter.There are several significant differences between this type of flowmeter and those controlled by a standard throttling device.The first difference is that, structurally, the hidden orifice plate is a combination of the controller and the intelligent transmitter.The second difference is the pipe warp. The pipe warp available with hidden orifice plate is less than 50mm, and the nominal diameter of typical pipe is 10mm and 20mm.The third difference is the accuracy. The hidden orifice plate can be calibrated according to the method of real flow to ensure the measurement accuracy. After real flow calibration, the accuracy can exceed 1.5 level.
Float flowmeter.The float flowmeter can also be called the motor rotor flowmeter, according to the material English key has the glass tube float flowmeter, the metal hose float flowmeter.With the advantages of small pressure loss and large measurement range, float flowmeter has become a common flow measurement instrument panel in industrial control system, which is not only convenient to use, but also has the advantages of strong compatibility mode.Very suitable for low water flow and small flow material flow measurement.Float flowmeter has the characteristics of simple structure, visualization, less damage to working pressure and convenient maintenance.The float flowmeter is suitable for measuring the small flow rate according to the pipe diameter D<100mm, and can also measure the flow rate of corrosive substances.
3. Vortex flowmeterSwirling vortex gas flowmeter is the use of forced vibration of the basic principle of swirling vortex work, swirling vortex gas flowmeter than the same diameter vortex flowmeter flow low limit is much lower, for the measurement of small flow steam, it is an advantage.Precession vortex gas flowmeter has a wide range of operating temperature;Large category;In a certain Reynolds number range, it will not be harmed by hydrodynamic temperature, working pressure, relative density and viscosity.Strong adaptability, with the exception of very large particles or longer chemical fiber residue, generally do not install filtration device;The upper, middle and lower reaches of the regulation is lower, the upper and lower reaches of 4D and 2D pipe segment can be taken;The output frequency is linearly dependent on the volume flow.
4. Quick-heat flowmeter.The key characteristics of the quick-heat steam mass flowmeter: the mass flow is measured immediately without compensation of temperature and pressure;Non-capacitive grid, no theme activity component, low working pressure damage, high credibility;Low water flow can be measured fine vapor flow;The regulation vapor material dry impetuous cleaning, not moisture content, oil and other residues;Plug - type fast - heat steam quality flowmeter is also suitable for medium and large size steam flow measurement.
The flow meter can meet the needs of most markets, including water, oil, food, lubricating oil, chemistry, cosmetics, ink, pharmaceutical, coating, petroleum, automobile, glue, polyurethane, electrolyte and additives.