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Matters Needing Attention to Ensure the Normal Operation of Metal Rotameter

Oct. 21, 2020

In order to ensure the normal operation of the metal tube rotameter and achieve the required measurement accuracy, the following points should generally be noted:

•The metal rotor flowmeter must be installed vertically, the fluid flows through the flowmeter from bottom to top, and the verticality is better than 2°, and the horizontal angle is better than 2° when installed horizontally;

•The metal tube float flowmeter installed on the process pipeline should be bypassed, so as to deal with the failure or not affect the production when purging;

•The entrance of the metal rotor flowmeter should have a straight pipe section of more than 5 times the pipe diameter, and the outlet should have a straight pipe section of 250mm to ensure the measurement accuracy of the instrument;

•If the medium contains ferromagnetic substances, a magnetic filter should be installed;

•If the medium contains solid impurities, consider installing a filter between the valve and the straight pipe section;

•When used for gas measurement, ensure that the pipeline pressure is not less than 5 times the pressure loss of the flowmeter to make the float work stably;

Metal Tube Rotameter

•If the temperature of the measured medium is higher than 220°C or the fluid temperature is too low, crystallization is likely to occur, and when heat insulation protection measures are required, the jacket type should be selected for cooling or heat preservation;

•The pipe flanges, fasteners, gaskets and the flow meter flange standards are the same to make the meter install and run normally;

• Generally, the product does not need maintenance after the normal operation of the device. Faults usually occur when the device is just started, and the float is stuck by the solid particles due to the uncleanness of the pipeline. At this time, the pointer of the indicator stops at a position. At this time should first close the valve on both sides of the flowmeter, and then remove the upper flange, take out the float for cleaning, and then reinstall. Pay attention to tighten the flange nut evenly and fill the washer well;

• In order to avoid flowmeter deformation caused by the pipeline, the flange of the process pipeline must be coaxial and parallel to the flange of the flowmeter, and the pipeline should be supported appropriately to avoid pipeline vibration and reduce the axial load of the flowmeter. In the measurement system The control valve should be installed downstream of the flow meter;

•Because the meter transmits signals through magnetic coupling, in order to ensure the performance of the meter, at least 250px around the installation, no ferromagnetic substances are allowed;

•The meter for measuring gas is calibrated under a specific pressure. If the gas is directly discharged to the atmosphere at the outlet of the meter, it will cause a pressure drop at the float and cause data distortion. If this is the working condition, a valve should be installed at the outlet of the instrument;

•Be careful when installing PTFE-lined meters. As the PTFE will deform under the action of uneven pressure, the flange nuts are tightened evenly and symmetrically;

•For instruments with liquid crystal display, avoid direct sunlight on the display when installing, so as not to reduce the service life of the liquid crystal;

•For meters with lithium battery power supply, try to avoid direct sunlight and high temperature environment (≥65℃) when installing to avoid reducing the capacity and life of the lithium battery.

The above information is provided by flow instrument manufacturer.

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