The reason for the decrease in accuracy of the split electromagnetic flowmeter is to analyze the reasons for the decrease in accuracy and the solution for different flowmeters: the split electromagnetic flowmeter is mainly used to measure the volume flow of conductive liquid and slurry in closed pipelines. Including acid, alkali, salt and other highly corrosive liquids. The product is widely used in petroleum, chemical, metallurgical, textile, food, pharmaceutical, paper and other industries, as well as environmental protection, municipal management, water conservancy construction and other fields.
1. Throttle device
The accuracy of such instruments as throttling devices generally does not require fluid calibration. The factory inspection mostly uses the "dry standard" method, and the basic accuracy can be calculated. The calculation is based on the "rated value" provided by the buyer, and the density of the medium can be automatically compensated and intelligently displayed. In this case, it is necessary to pay attention to whether the installation location of the instrument meets the requirements of the instrument, such as the length of the straight pipe. If the requirements are not met, the calculation of the additional error should refer to the instruction manual of the instrument. The throttling device has certain requirements for the straight pipe section, and the additional error caused when it cannot be met is specified for the standard throttling device.
2. Positive displacement flow meter
The actual viscosity of the fluid may also have an impact on the meter readings, which should be considered according to the meter's instructions. The length of the straight pipe section generally does not affect its accuracy, which is the outstanding advantage of this type of instrument. This type of instrument displays the volume flow of the fluid under working conditions. What the user needs is usually the volume flow or mass flow under the standard state, and the density compensation of the fluid is also required. Most of the new flowmeters now use intelligent display instruments and have automatic density compensation.
3. Split electromagnetic flowmeter
The principle of the split electromagnetic flowmeter is based on Faraday's electromagnetic induction theorem. The inner diameter (flow area) of the sensor's pipe has an influence on the measured value. When the pressure and temperature of the fluid medium are different from the reference conditions, the difference in the flow area will cause the meter reading to change It can be calculated, otherwise a certain error will be generated. The meter measures the volume flow under working conditions. If the volume flow or mass flow under standard conditions is required, density compensation is still needed.