Rotor flowmeter calibration formula

Project Overview

The rotameter is a common flow measurement instrument used to measure the flow of liquid or gas. In actual use, due to the influence of various factors, the rotameter may have certain errors, so it needs to be corrected.

The calibration formula of the rotameter is generally corrected based on the difference between the actual measured value and the standard value. The correction formula usually uses methods such as linear interpolation or polynomial fitting, which may differ depending on the specific sensor model and calibration conditions. The following is an example of a simplified linear interpolation correction formula:

Assuming that the measured value of the rotameter is Qm and the standard value is Qs, the correction formula can be expressed as:

Qc = a Qm + b

Where:

Qc is the corrected flow value,

a is the correction coefficient, used to adjust the proportion of the measured value,

b is the offset, used to adjust the zero point error of the measured value.

The correction coefficient a and offset b need to be determined through experiments or by referring to the correction table provided by the manufacturer. During the calibration process, a series of known standard flow values ​​and corresponding rotameter measurement values ​​are usually used to establish a calibration curve, and then appropriate a and b values ​​are obtained through fitting.

It should be noted that the calibration process of the rotameter should be carried out by professional technicians, and in actual applications, calibration should be carried out regularly to ensure the accuracy and reliability of the measurement results. Calibration frequency and method should be determined based on specific usage and production requirements.