Steam pipeline flowmeter manufacturer

Steam pipeline flowmeter manufacturersummary:

The basic principle of a vortex natural gas flowmeter is the Karman vortex principle, which states that "the vortex separation frequency is proportional to the flow velocity. The diameter of the transmitter's flow body is basically the same as the nominal diameter of the instrument. As shown in Figure 1, there is an approximately isosceles triangle shaped cylinder inserted into the flow body, with its axis perpendicular to the direction of the measured medium flow and its bottom facing the fluid.

Steam pipeline flowmeter manufacturer

When the measured medium flows through the cylinder, vortices are alternately generated on both sides of the cylinder, and vortices are continuously generated and separated. Two rows of staggered vortices, known as "vortex streets," are formed downstream of the cylinder. Theoretical analysis and experiments have shown that the frequency of vortex separation is directly proportional to the flow velocity of the column side medium. Vortex interlocking separation generates pulsating pressure in the wake on both sides and behind the cylinder. The detection probe located inside (or behind) the cylinder is subjected to this tiny pulsating pressure, causing the piezoelectric crystal elements embedded in the probe to experience alternating stress and generate alternating charge signals. After undergoing charge transformation, amplification, filtering, limiting, and triggering shaping on the amplifier, the signal outputs a square wave voltage pulse signal with the same frequency as the vortex separation frequency. The signal is then sent to the local display device, and each pulse output by the sensor will represent a certain volume of the measured fluid. The total number of output pulses over a period of time will represent the total volume of fluid flowing through the sensor during that time. The voltage pulse signal output by the sensor is sent to an integrated local display device. The on-site display instrument adopts a new low-power CPU to measure the frequency signal output by the vortex sensor, and performs flow calculation based on the set density and vortex flow coefficient. The on-site LCD displays the instantaneous flow rate and cumulative flow rate.