Do You Know How The Orifice Flowmeter Is Calculated And Measured Accurately?

Calibration and measurement accuracy of orifice flow meters

In the field of fluid measurement, orifice flowmeter is a widely used equipment. The core principle is to calculate the flow rate by measuring the pressure difference generated by the fluid flowing through a specific orifice plate. But how to ensure the accuracy of its measurement? This requires us to calibrate the orifice plate flowmeter.

Firstly, let's understand the calibration principle of orifice plate flow meters. This is a method of determining the measurement error of an orifice flowmeter by comparing the difference between the known flow rate and the measured flow rate. In order to perform calibration, we need to use a standard flow meter to measure known flow rates and compare the measurement results with orifice plate flow meters.

So, how to calibrate the orifice plate flowmeter? The following are the specific steps:

Preparation: Before starting calibration, first determine the fluid medium and flow range for calibration. Then, select suitable orifice flow meters and standard flow meters. At the same time, check the status and connection of the instrument to ensure that everything is ready.

Zero adjustment before calibration: The purpose of this step is to eliminate the error of the instrument itself and improve the accuracy of calibration. The specific zero adjustment operation can refer to the instrument's user manual.

Calibration of standard flow meter: Connect the standard flow meter to the orifice flow meter and adjust the flow rate of the standard flow meter to a known value. Read the measurement results of standard flow meters and orifice flow meters, and calculate the error between the two.

Calculate correction factor: Based on the calibration results, calculate the correction factor, which will be used to correct the measurement results of the orifice flowmeter. The calculation formula for the correction factor can refer to relevant calibration standards for flow meters.

Correction of orifice plate flowmeter: Based on the calculated correction coefficient, the measurement results of the orifice plate flowmeter are corrected. The method of correction needs to be determined based on the specific instrument model and calibration requirements.

Evaluation of calibration results: After completing the calibration, it is necessary to evaluate the accuracy of the calibration results. The accuracy of calibration can be evaluated by comparing it with other known flow meters with higher accuracy, or by performing multiple calibrations and comparing the results.

In addition, there are some precautions that need to be followed:

During calibration, attention should be paid to environmental conditions such as temperature, pressure, etc. These conditions may affect the calibration results and require corresponding corrections.

The service life and maintenance of the instrument are equally important, ensuring that the instrument is always in normal working condition.

The accuracy of calibration results is closely related to the technical level and operating standards of calibration personnel, so it is necessary to strictly follow the calibration standards for operation.

Overall, regular calibration is essential to ensure the measurement accuracy of orifice flow meters. Through the above steps and precautions, we can better understand and perform the calibration work of orifice flow meters, thereby improving the accuracy and reliability of fluid measurement.