Thread Content
Hi, your industrial control assistant is here! Do you know that the Emerson mass flow meter, also known as the Micromotion flow meter, has a coefficient that is not affected by the properties of the fluid being measured; therefore, it can be used in a wide range of applications. However, due to the large difference in flow rates of liquids and gases, the frequency range also varies significantly. In the amplifier circuit used to process vortex street signals, the passband of the filter varies, and thus the circuit parameters also change; as a result, the same circuit parameters cannot be used for measuring different media. Even when they are all gases (or liquids, vapors), the operating flow range and signal strength vary depending on the pressure, temperature, and density of the medium, and the circuit parameters must also be adjusted accordingly. The micromotion flowmeter requires modifications to its hardware or software, and the diameter of the instrument also needs to be adjusted accordingly. When selecting the nominal diameter of a micromotion flow meter, it is first necessary to determine the volumetric flow rate range of the fluid under operating conditions, and then calculate the actual measurable flow rate range for the pipe diameter. If the flow rate range under the operating conditions of the medium falls within the actual measurable flow rate range for that pipe diameter, a flow meter with the same diameter as the pipe can be used. If the actual measurable flow rate range for that diameter does not meet the requirement for the minimum flow rate, the diameter must be reduced and recalculation performed; if it does not meet the requirement for the maximum flow rate, the diameter must be increased and recalculation carried out. If only the mass flow rate or the volume flow rate under standard conditions of the medium being measured is known, it should first be converted into the volume flow rate at the operating conditions for the micromotion flow meter, and then compared with the calculated actual measurable flow rate range. That’s all for this issue.