News & Articles

GB/T 18659-2002 'Measurement of conductive liquid flow in closed conduits – Methods for evaluating the performance of electromagnetic flowmeters' is a key national standard. This article interprets its scope, referenced standards, definitions, performance indicators, test methods, and inspection rules, helping engineers and procurement professionals understand requirements and improve selection and application.

This article interprets the definition of accuracy classes for industrial flowmeters, comparing Class 0.5 and Class 0.2 in terms of maximum permissible error, turndown ratio, environmental adaptability, and application scenarios. Examples illustrate the impact of accuracy selection on measurement results, emphasizing that selection should consider process requirements, cost, and maintenance rather than blindly pursuing high accuracy.

This article compares ultrasonic and electromagnetic flowmeters from working principle, applicable media, accuracy, installation and maintenance, helping engineers make reasonable choices based on conditions such as conductivity, bubbles, pipe diameter, etc. Selection principles based on standards (e.g., GB/T 18604, GB/T 2624) are emphasized, avoiding brand preference.

Vortex flowmeters are widely used in steam measurement, but in practice, issues such as steam state changes, vibration interference, and improper installation often lead to measurement errors. Based on industry technical principles and standards, this article systematically analyzes typical problems including Reynolds number limitations, two-phase flow effects, vibration interference, and insufficient temperature/pressure compensation, and proposes corresponding countermeasures such as proper selection, correct installation, enhanced maintenance, and digital signal processing to improve measurement accuracy and stability.

Based on the working principle of electromagnetic flowmeters, this article proposes key selection factors for different process sections (inlet pump station, aeration tank, dosing point, discharge outlet) in wastewater treatment plants, considering medium characteristics (impurities, bubbles, corrosiveness). It covers electrode material (e.g., Hastelloy, tantalum), lining material (polyurethane, PTFE), grounding ring, installation position, and signal stability. Referencing GB/T 18659-2023, practical selection suggestions are given to help engineers avoid common mistakes and ensure long-term reliable measurement.

This article analyzes flow meter selection under wastewater conditions from aspects such as lining material, electrode, and diameter selection.