As a precision instrument in the field of industrial flow measurement, the measurement accuracy and long-term stability of the Cologne vortex flowmeter not only depend on its excellent design, but also closely related to installation specifications.Proper installation is the primary step in ensuring efficient operation and reducing failures, involving multiple key dimensions such as installation location selection, pipeline configuration, environmental avoidance, and meticulous debugging.

　　1、 Core premise: Installation location and straight pipe section requirements

Vortex flowmeter is extremely sensitive to fluid flow state, and ensuring sufficient straight pipe sections before and after the measurement point is the basis for obtaining accurate data. If there are two 90 ° elbows on the same plane upstream of the sensor, the length of the upstream straight pipe section should be ≥ 25D (D is the nominal diameter of the pipeline), and the downstream should be ≥ 5D; if there are two 90 ° elbows on different planes upstream, the length of the upstream straight pipe section should be ≥ 40D. The regulating valve must be installed outside the downstream 5D of the flowmeter. If it is necessary to install it upstream due to process requirements, the length of the upstream straight pipe section of the flowmeter should not be less than 50D. Generally, the upstream side of the flowmeter should maintain a straight pipe section of not less than 20D, and the downstream side should not be less than 5D. If there are strong disturbance sources such as pumps and valves upstream, the length of the straight pipe section needs to be further increased. During installation, the inner diameter of the upstream and downstream piping should be consistent with the inner diameter D_b of the flowmeter body, and the difference should meet the strict requirement of 0.98D_b ≤ D_p ≤ 1.05D_b. The piping and flowmeter should be kept concentric, and the different axial degrees should be less than 0.05D_b to prevent flow field distortion.

　　2、 Environmental Avoidance and Pipeline Layout Strategies

The installation site should avoid strong mechanical vibration points. Strong vibration of pipelines can interfere with the normal detection of vortex signals, resulting in distortion or fluctuation of measured values. If unavoidable, pipeline fastening devices should be installed approximately 2D upstream and downstream of the flowmeter, and consideration should be given to installing anti vibration pads or using hoses for isolation. Meanwhile, the equipment should be kept away from strong electromagnetic interference sources such as high-power motors and frequency converters. In addition, installation points should avoid high temperature heat sources and corrosive gas environments. If it is necessary to operate in a high-temperature environment or measure high-temperature media, insulation measures should be taken to ensure that the temperature of the converter housing does not exceed 70 ℃ and to prevent electronic components from overheating. In pipeline layout, flow meters can be installed horizontally, vertically, or diagonally. When measuring liquids, it is necessary to ensure that the pipeline is filled with liquid. When installed on a vertical pipeline, the flow direction of the liquid should be from bottom to top to prevent the accumulation of gas released from the liquid in the instrument. When measuring gas, if the gas contains a small amount of liquid, the airflow should also flow from bottom to top to prevent liquid from entering the measuring tube.

　　3、 Installation Practice and Debugging Precautions

During installation and construction, the inner diameter of the sealing gasket at the flange connection must be greater than the inner diameter of the instrument and cannot protrude into the interior of the pipeline to avoid disturbing the fluid and causing additional errors. For the convenience of future maintenance and repair, it is strongly recommended to install a bypass pipeline. For working conditions that may damage the detection components, shut-off valves should be installed before and after the flow meter, and cut-off ball valves should be installed for plug-in flow meters. After the instrument wiring is completed, it should be ensured that the electrical interface is well sealed, especially when installed outdoors. Waterproof, sunscreen, and moisture-proof treatment should be done well. The cable entrance should be bent into a U-shape to prevent moisture from seeping into the amplifier housing along the cable. When debugging, the valve should be slowly opened first to observe for leaks around the sensor and check if the display is normal.

　　Conclusion

The standardized installation of Cologne vortex flowmeter is a delicate system engineering, which deeply affects the accuracy of measurement and the service life of equipment. From meeting the requirements of straight pipe sections, avoiding vibration interference, to meticulous pipeline layout and sealing treatment, every link must strictly follow technical specifications. Only by laying the foundation of "standardized installation" can we fully leverage the technical advantages of high precision and reliability of Cologne vortex flowmeter, and provide stable and reliable data support for process automation and energy metering.