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Vortex shedding flowmeter
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LQM820 series vortex flowmeter is a flow meter for measuring gas, steam or low viscosity liquid according to Karman vortex principle. Mainly used for industrial pipeline medium fluid flow measurement, such as gas, liquid, steam and other media.
Measuring principle:
Vortex flowmeter is the use of Karman vortex principle for flow measurement. When a column is vertically inserted into the measuring tube, the fluid passes through the two sides of the column to naturally alternately produce regular vortices, which are called Karman vortex streets. When d/D = 0.281 (D is the pipe diameter), the released vortex is the most stable. The release frequency of the vortex is related to the average velocity of the fluid flowing through the vortex generator and the characteristic width of the vortex generator.
Product features:
1. Good anti-vibration performance, no zero drift, high reliability
2, the sensor has strong versatility and good interchangeability.
3, the structure is simple and firm, no moving parts, long-term operation is very reliable
4. The detection element does not contact with the medium, with stable performance and long service life
5. Wide measuring range, the highest range ratio can reach 20:1
6, the pressure loss is small, only 1/4~1/2 of the orifice plate
7. Within a certain Reynolds number range, the flow characteristics are not affected by fluid pressure, temperature, viscosity, density, and composition, and are only related to the shape and size of the vortex generator.
8. Wide application range, steam, gas and liquid flow can be measured
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Model: LQM820 Path DN15 ~ DN300, DN150 ~ DN2000 (plug-in) Scope of application Gas (air, oxygen, nitrogen, coal gas, natural gas, chemical gas, etc.), liquid (water, high temperature water, oil, food liquid, chemical liquid, etc.), steam (saturated steam, superheated steam) Accuracy Class Liquid 0.5 stage; gas and vapor 1.0 stage; plug-in 2.5 stage Medium temperature -40℃ ~ 250 ℃,-40℃ ~ 350 ℃,-40℃ ~ 400 ℃ Flow rate range Liquid: 0.6-6 m/s, gas: 5-60 m/s, steam: 5-70 m/s Nominal pressure 1.6MPa、2.5MPa、4MPa Working temperature Temperature:-25~55 ℃, humidity 5% ~ 90% Signal output Voltage pulse, 4 ~ 20mA optional Digital Communication RS485 Modbus、HART Power supply Voltage pulse output when 12VDC,4 ~ 20mA output when 24VDC, on-site LCD display 3.6V lithium battery power supply (instrument comes) Table body material 1Cr18Ni9Ti Protection level IP65 Electrical excuses M20 × 1.5 Explosion-proof grade The safety type, flameproof type Installation method Flange clamping or integrated flange connection