Classification of elbow sensors The primary sensing element of the elbow flow meter -- the elbow sensor is divided into the following three types according to its installation on pipelines: • 90° elbow sensor -- used at 90° turning connections in process pipelines, replacing the original elbow. • 180° elbow sensor -- used on straight pipelines, replacing part of the straight pipe section. • 135° elbow sensor -- used at 135° turning connections in process pipelines, replacing the original elbow. The two small straight pipe segments welded onto different elbow sensors are called pressure-tapping bodies. The side with the longer arc of the elbow is for positive pressure measurement. 90° and 135° elbow sensors are further subdivided into the following three types based on the plane formed by the turns in the installed process pipeline: • Vertically installed elbow sensor with positive pressure measurement on top -- the plane formed by the turn is a vertical plane, and the side with the larger arc length of the turn is on top. • Vertically installed elbow sensor with negative pressure measurement on top -- the plane formed by the turn is a vertical plane, and the side with the larger arc length of the turn is below. Horizontally installed elbow sensor -- the plane formed by the turn is a horizontal plane. The 180° elbow sensor only has a horizontal installation form; other installation forms are meaningless. Installation dimensions of the elbow sensor For 90° and 135° turns, as long as the originally connected elbow uses a standard elbow with a bend radius ratio of 1.5, both 90° and 135° elbow sensors can be well substituted, with their installation dimensions slightly adjusted. For 180° elbow sensors, they need to replace part of the straight pipeline. Characteristics of elbow sensors • No additional resistance loss (for 90° and 135° elbow sensors), saving fluid transportation power consumption and reducing operating costs. • Easy installation, no leakage, maintenance-free, wear-resistant, and can be directly welded onto the pipeline. • High-temperature resistant, corrosion-resistant, anti-vibration, anti-impact, and good anti-magnetic performance. • Strong adaptability, wide range of measurement, low requirement for straight pipe sections. • High measurement accuracy and good reproducibility; measurement accuracy can reach ±1% or more, and reproducibility can be as high as 0.2%. • Long service life. • Features of ZWRY series main unit • Multi-loop, multi-parameter display. • Advanced touch keys, novel appearance and structural design, convenient operation. • Power-off protection function, protecting important data from being lost after power-off. • Comprehensive real-time computation compensation and digital filtering functions, improving system measurement accuracy and stability. • Intelligent logic judgment and self-diagnosis functions. • RS-232 (or 485) serial interface output, which can directly communicate with other instruments or computer systems, meeting the real-time communication needs between users and external devices, or external control and printing functions. • Standard (4-20mA) analog output (can be selected according to user needs). • Heat accumulation function, which can be used to measure the accumulated heat of steam and heating hot water. • Clock function, unaffected by the host power supply, providing users with accurate time. • Small size, low power consumption, stable operation, high measurement accuracy.
Source of this article: Zhuohui Elbow (http://www.hbzhuohui.com/)