Flowmeter requirements

To measure whether the measuring instrument is correct or not, and whether the measurement method is appropriate, several indicators are commonly used to measure: accuracy, zero drift, response time, repeatability, dead zone, resolution, and sensitivity. The most concerned about these indicators is accuracy. The accuracy marked on the instrument product is formulated under certain reference conditions in the factory, but it is not the same as the on-site use conditions. Whether the method selection is appropriate, several indicators are commonly used to measure: accuracy, zero drift, response time, repeatability, dead zone, resolution, and sensitivity. The most concerned about these indicators is accuracy. The accuracy marked on the instrument products are all formulated under certain reference conditions in the factory, but they are not the same as the on-site use conditions, which will bring errors to the measurement. It is sometimes difficult to grasp all the process data related to the instrument during the design, and some conditions are estimated according to the assumptions during the design. In actual production, you will find that the difference in such conditions may even be very large. When designing, understand the process data and operating conditions as much as possible. This additional error may be smaller. Especially when calculating the caliber of the regulating valve, it is important to find the correct data, such as pipe size, allowable pressure loss, fluid characteristic data, maximum and minimum flow, operating parameters, etc. The design is not very clear, and there are assumptions. In liquid level measurement, certain operating conditions may also be incorrectly selected during design, which may cause errors. For example, differences in actual operating temperature, pressure and design values u200bu200bwill also cause errors in liquid level measurement by the difference method. Online component analysis and measurement are more important for the mastery of production process material data. If you don't know the influence of process material characteristics, operating conditions, and environmental conditions on measurement during design, it is difficult to find more suitable measurement methods, instrument materials and instrument structure forms that are more suitable for process production and environmental conditions. In addition to the incorrectness of the meter itself, there are many reasons that can also cause the incorrectness of the meter measurement. In addition to the limitations of the design conditions mentioned above, improper location, installation or use of the meter's detection point can also bring measurement errors. Recognizing this, attention should be paid to eliminating these factors that cause errors in the design, installation, and use of these links.