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1. Qingdao Aobo ORB-LUGB Vortex Street Steam Flow Meter 80 Size
Qingdao Aobo ORB-LUGB Vortex Street Steam Model World Watch Flow Meter DN80 Specification Parameters and Selection Guide
1. Core Parameters nominal diameter: DN80 (flange mounted) Measuring medium: steam (saturated/superheated), gas, liquid Accuracy level: liquid ± 1.0%, gas/steam ± 1.5% Pressure resistance level: standard 1.6MPa/2.5MPa, customizable 4.0-10.0MPa Temperature range: -20 ℃~350 ℃ (special calibration required for high temperature steam) Body material: 304 stainless steel (contact medium part)
2. Key Features 1 Wide range ratio: usually up to 1:10~1:15, suitable for scenarios with large flow fluctuations No moving parts: using piezoelectric sensors to reduce wear and maintenance requirements Integrated display: On site LCD screen displays instantaneous/cumulative traffic in real-time Signal output: 4-20mA analog signal+pulse output, supporting RS485 communication (MODBUS protocol)
III. Selection precautions • Steam type: saturated steam requires temperature compensation, superheated steam requires temperature and pressure compensation • Installation requirements: front and rear straight pipe sections are recommended to be 20DN/5DN (to ensure measurement accuracy) buried • Protection level: IP65 (outdoor rain and dust protection), explosion-proof type can be selected Ex d Ⅱ CT6
IV. Typical application scenarios • Boiler steam metering (condenser required) • Chemical process steam consumption monitoring • Food processing industry high temperature medium flow control Data source: Qingdao Aobo Instrument 2023 version product technical manual, specific selection needs to be based on actual working conditions paramete
2. Vortex flow sensor
In the late 1960s, a new type of instrument that applied the principle of fluid vibration to measure flow rate, namely fluid vibration flowmeter, emerged successively.
. There are currently two types of vortex flow meters that have been applied, one is the Karman vortex flow meter that uses natural vibration, and the other is the vortex flow meter that uses forced vibration. This high-sensitivity flowmeter has no movable parts inside the pipeline, a long service life, a wide linear range, and is almost unaffected by changes in temperature, density, pressure, viscosity, etc. It has low pressure loss and high accuracy. The output of the instrument is a pulse signal proportional to the volumetric flow rate, which is suitable for gases and liquids, so it is quite popular. According to fluid mechanics, the Karman vortex is known to occur behind a nonlinear object, such as a cylinder, triangular prism, etc., when the flow sail body advances at a certain speed v, if a nonlinear object is placed vertically on the path of advancement, a vortex will form behind the nonlinear object, forming the Karman vortex street. If the object is a cylinder with a diameter of d, research has shown that the frequency of vortices occurring behind the cylinder is the same as in the design and use of hydraulic power head core drilling machines, where v is the flow velocity; D is the diameter of the cylinder; St is a dimensionless number related to the Reynolds number Re, known as the Strouhal number. The experiment can determine the relationship between St number and Reynolds number, as shown in Figure 7-24. From the relationship between Strouhal number and Reynolds number (logari