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1. Whether the vortex flowmeter needs temperature and pressure compensation depends on the actual needs. The following is a specific analysis: If the operating condition deviation is not significant or the requirements are not high, the vortex flowmeter may not require temperature and pressure compensation. Because the vortex flowmeter itself is a velocity type flowmeter, the flow rate is calculated by measuring the flow velocity of the medium through the Ling method. If the operating conditions are not significantly different from the design conditions or the measurement accuracy requirements are not high, the influence of the density change of the medium on the flow rate can be ignored, so there is no need to perform temperature and pressure compensation using the ruler. If accurate measurement is required, the vortex flowmeter needs to be calibrated for temperature and pressure. Because flow calculation involves medium density, and the density of substances will vary under different temperature and pressure conditions. If the working conditions change, the density of the medium will also change accordingly, which will cause deviations in the measurement results of the flowmeter. In order to obtain accurate flow data, it is necessary to perform temperature and pressure compensation to correct measurement errors caused by changes in medium density. 2. 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%
2. Key characteristics 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 parameters and manufacturer Confirm.
3. Vortex flowmeter | Several factors affecting accuracy
The factors affecting the accuracy of vortex flowmeters mainly include the following: Saturated steam dryness: When measuring saturated steam with a vortex flowmeter, its dryness is required to be no less than 85%.
. In actual working conditions, the dryness
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