Correct installation method for E H mass flow meter

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This post was last edited by It will be better tomorrow on 2020-3-10 07:34. The correct installation method for German E H mass flow meters: (1) Basic requirements – There should be at least a 0.6m distance between the sensor and any large transmitter or motor. Since the operation of sensors relies on electromagnetic fields, it is essential to avoid installing them in areas with strong interfering electromagnetic fields. Additionally, the installation location should be carefully selected to minimize vibration as much as possible. 　　 (2) Installation position when measuring liquids: The sensor should be installed in such a way that the tube is always filled with liquid, thereby reducing the impact of density changes on the measurement accuracy. And when the process pipeline needs to be cleaned, the installation location should allow for complete drainage of the liquid. To prevent gas from accumulating inside the sensor, it should be avoided to install the sensor at the end of the piping system. (3) Installation location when measuring gas: To prevent liquid from accumulating inside the sensor, it should be avoided to install it at the lowest point of the pipeline. (4) Installation direction: The requirements of the installation process and the location of the already installed process pipelines determine the installation direction of most sensors. Although the installation angle of the sensor does not affect the operation of the flow meter, the following recommendations should be taken into consideration as much as possible: (a) When measuring liquids, the sensor housing should be installed facing downward to prevent air from accumulating inside the flow tube ； 　　(b) When measuring gases, the sensor housing should be installed with the top facing up to prevent condensation water from accumulating in the flow tube ； 　　(c) When measuring liquid slurries, the sensor should be installed vertically, like a flag, to prevent particles from accumulating inside the flow tube. The process medium should flow from bottom to top to avoid jetting through the pipe. Jiangsu Hengda Instruments (5) Flow direction: The sensor can measure flow rate regardless of the direction of flow. Arrows are generally used on sensors to indicate the normal flow direction of the fluid. (6) Valve: To facilitate zeroing of the flow meter, a stop valve should be installed downstream of the sensor. To facilitate batch processing, the sensors and stop valves should be placed as close as possible to the receiving container. No hoses should be installed between the sensor and the shut-off valve to avoid batch errors caused by expansion or compression. Additionally, a control valve can be installed downstream to prevent the medium from vaporizing or being evacuated. (7) For gas-liquid two-phase flow, such as when the process medium results in gas-liquid two-phase flow, the sensor housing should be installed with its bottom facing down, or on a vertical pipe. This installation method can effectively prevent gases in the medium from accumulating in the flow tube. (8) Loading and unloading measurement In loading and unloading measurement applications, the sensor housing should be installed with the top side facing up or vertically. A check valve should be installed downstream of the sensor to prevent backflow of the medium. The check valve should be installed as close as possible to the sensor. In some cases, the process medium cannot be completely removed from the pipes; in such situations, a flag-style installation is generally recommended. When loading or unloading the application, it is advisable to follow these startup steps as much as possible: (a) Install shut-off valves upstream and downstream of the sensor ； 　　(b) Close the upstream valve ； 　　(c) Open some downstream valves ； 　　(d) Slowly open the upstream valve to discharge air and fill the sensor with the medium ； 　　(e) When the flow system starts measuring, slowly open the downstream valve until it is fully open. 　　 Troubleshooting of German E H mass flow meters – Hardware failures: If there is a large error, the accumulator does not light up or does not increase its value, and the display shows no information, the possible causes are as follows: a. Improper installation can lead to zero drift in the flow meter; for example, if the E H mass flow meter is installed too close to the pump outlet, the support for the sensor may not be strong enough, improper welding of the connection flanges can generate stress signals, and the cables may suffer from electromagnetic interference. 　　b. Wiring issues If the monitor does not light up, check the power connection to the accumulator. If a fuse has blown, verify that the input voltage matches the specified standard voltage and that the AC/DC type is correct. If the accumulator does not increase as flow rate rises, the connections of the accumulator should be checked. If the accumulator is equipped with a forward/reverse function, the connections of the flow meter should be checked, as incorrect connections to the flow meter can prevent the accumulator from increasing during reverse flow. 　　c. Changes in the process medium: If the medium being measured contains air bubbles, undergoes vaporization, or is in a two-phase flow state, the transmitter will emit an alarm signal; in severe cases, the sensor will stop functioning. 　　d. Transmitter failure. 　　e. Sensor failure. 　　f. Pipeline purging issues. 　　Software issues – Troubleshooting of EH mass flowmeters: Before installing and using a flowmeter that has just been calibrated, it is essential to perform a zero-point calibration under the current operating conditions. It is necessary to ensure that the flowmeter is filled with the medium before closing the shut-off valves at both ends in order to carry out the zero-point calibration. There are various methods for this purpose, including panel operation, use of a handheld controller, and the ProLink II software. 　　a. The zero-point calibration is incorrect. 　　b. The parameter settings are incorrect. 　　c. Pulse fluctuations of the power supply. 　　The d.i/o configuration is incorrect (be sure to pay attention to the range). 　　e. Incorrect operation