Endress+Hauser Differential pressure flowmeters

Endress+Hauser Differential Pressure Flowmeters Installation Guide

Introduction

In the instrumentation industry, E+H (Endress+Hauser) stands as a leading brand for flowmeters, with its differential pressure flowmeters being widely utilized in various industrial sectors. Renowned for their high precision, reliability, and stability, E+H differential pressure flowmeters have become a trusted choice for numerous industrial users. This guide provides a detailed overview of the installation process for Endress+Hauser differential pressure flowmeters, aiming to offer reference and guidance to relevant industries.

Principles and Working Mechanism

Endress+Hauser differential pressure flowmeters operate based on Bernoulli's equation and fluid mechanics principles. When fluid flows through a pipeline, changes in pipe cross-sectional area or the presence of restriction devices (such as orifice plates, nozzles, etc.) create a pressure difference. This pressure difference correlates with the fluid flow rate, allowing for the calculation of fluid flow by measuring this pressure difference.

Specifically, differential pressure flowmeters measure the pressure difference before and after the restriction device using two pressure sensors installed in the pipeline (typically referred to as the high-pressure side and low-pressure side). This pressure difference is converted into an electrical signal and transmitted to the transmitter. The transmitter, using preset calibration parameters and fluid characteristics, converts the electrical signal into a flow rate value, which is displayed or transmitted to the control system.

Installation Guide

1. Preparation Before Installation

Before installing an E+H differential pressure flowmeter, it is crucial to thoroughly understand the site conditions and configure the flowmeter accordingly.

Pipeline Characteristics: Assess the pipeline's material, wall thickness, and diameter as these factors influence the propagation characteristics of the differential pressure signal. Select appropriate probe installation methods and coupling agents based on actual conditions.

Pipeline Age: Older pipelines may exhibit deformation, corrosion, and other issues that can affect measurement accuracy. Special attention should be given to such pipelines.

Fluid Characteristics: Consider the fluid type, presence of impurities, bubbles, and whether the pipeline is full. These factors significantly impact measurement accuracy and require selecting an appropriate installation method based on actual conditions.

Fluid Temperature: Ensure that the fluid temperature falls within the instrument's operating range to prevent performance degradation.

Installation Site Conditions: Identify potential interference sources such as variable frequency drives, strong magnetic fields, etc., and select an installation location that avoids these interference sources.

Ambient Temperature: Ensure that the ambient temperature at the transmitter installation site remains within the instrument's allowable operating range.

Power Supply Voltage: Verify the stability of the power supply voltage as fluctuations can affect instrument performance.

Signal Transmission Requirements: Determine whether remote signal transmission is required and the type of signal to configure the corresponding signal transmission equipment.

2. Selection of Installation Location

The choice of installation location has a significant impact on the measurement accuracy of E+H differential pressure flowmeters. The following principles should be followed:

Avoid Interference Sources: Keep away from strong magnetic fields and vibration interference sources such as pumps, high-power radio stations, and variable frequency drives.

Pipe Material Selection: Choose pipe sections that are uniform and dense, facilitating the transmission of differential pressure signals.

Straight Pipe Section Length: Ensure that the upstream straight pipe section length is greater than 10D (D being the pipe diameter), and the downstream straight pipe section length is greater than 5D.

Distance from Pump: Maintain a distance of at least 30D upstream from the pump to avoid turbulence generated by the pump.

Full Pipeline: Ensure that the pipeline is full of fluid to avoid gas accumulation and measurement errors.

Operating Space: Provide sufficient space around the pipeline for on-site personnel to operate, and for underground pipelines, build test wells.

3. Application Cases

To illustrate the installation process and its importance, let's consider a case study:

A chemical plant installed an E+H differential pressure flowmeter on a 200mm diameter transportation pipeline to measure the flow of chemical products. Before installation, technicians conducted a detailed site survey and selected the appropriate probe installation method and coupling agent. During installation, technicians strictly followed the installation steps and paid special attention to details such as grinding the probe installation points and cable sealing. After installation, technicians performed debugging and calibration to ensure accurate and reliable measurements. After a period of operation, the instrument demonstrated good stability and measurement accuracy, meeting the production needs of the chemical plant.

Conclusion

Endress+Hauser differential pressure flowmeters, as high-precision flow measurement instruments, have broad application prospects in industrial flow measurement. However, to ensure their measurement accuracy and stable operation, correct installation methods are crucial. Before installation, it is necessary to thoroughly understand the site conditions and configure the flowmeter accordingly.