Overview of the classification and characteristics of bend pipe sensors

Classification of Elbow Flow Sensors   The primary sensing element of the elbow flowmeter — the elbow flow sensor — can be divided into the following three types based on different installation pipelines:  

• 90° Elbow Flow Sensor — used at 90° turning connections in process pipelines, replacing the original elbow.  

• 180° Elbow Flow Sensor — used in straight pipelines, replacing a section of straight pipe.  

• 135° Elbow Flow Sensor — used at 135° turning connections in process pipelines, replacing the original elbow.  

The two small sections of straight pipe welded onto different elbow sensors are referred to as pressure-tapping bodies. For the elbow with a larger arc length, the side facing positive pressure is measured.  

90° and 135° elbow sensors can be further subdivided into the following three types based on the plane formed by the turn in the installed process pipeline:  

• Vertically Installed Elbow Sensor with Positive Pressure Measurement Above — the plane formed by the turn is a plumb plane, and the side with the larger arc length of the elbow is above.  

• Vertically Installed Elbow Sensor with Negative Pressure Measurement Above — the plane formed by the turn is a plumb plane, and the side with the larger arc length of the elbow is below.  

• Horizontally Installed Elbow Sensor — the plane formed by the turn is a horizontal plane.  

For the 180° elbow sensor, only horizontal installation is meaningful; other installation forms are irrelevant.  

Installation Dimensions for Elbow Sensors  

For 90° and 135° turns, as long as the originally connected elbows use standard elbows with a bend radius ratio of 1.5, both 90° and 135° elbow sensors can replace them well, with their installation dimensions being similar. For 180° elbow sensors, they need to replace a section of 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 pipelines.  

• High-temperature resistant, corrosion-resistant, anti-vibration, anti-shock, and good anti-magnetic properties.  

• Strong adaptability, wide range of measurement, and low requirements for straight pipe sections.  

• High measurement accuracy and good reproducibility; measurement accuracy can reach ±1% or higher, with reproducibility as high as 0.2%.  

• Long service life.  

Characteristics of ZWRY Series Hosts  

• Multi-loop, multi-parameter display.  

• Advanced touch buttons, novel appearance and structural design, convenient operation.  

• Power-off protection function, ensuring important data is not lost after power-off.  

• Complete real-time computational compensation and digital filtering functions, improving system measurement accuracy and stability.  

• Intelligent logical judgment and self-diagnosis functions.  

• RS-232 (or 485) serial interface output, allowing direct communication networking with other instruments or computer systems, meeting real-time communication needs between users and external devices, or external control and printing functions.  

• Standard (4-20mA) analog output (optional according to user needs).  

• Heat accumulation function, which can be used to measure accumulated heat for 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, and high measurement accuracy.

Source of this article: Zhuohui Elbow (http://www.hbzhuohui.com/gggj/wg1.html)