Measurement Characteristics of Mass Flow Meter and Uncertainty in Measurement Process

The measurement characteristics of the mass flowmeter and the uncertainty in the measurement process The measurement characteristics of the mass flowmeter are divided into static characteristics and dynamic characteristics, which will be introduced in detail below. 1. Static characteristics: It refers to the relationship between input and output when the measured value is in a steady state. The basic requirements for static characteristics are: the input is zero and the output is also zero, and the output and input form a unique correspondence. The parameters that characterize the static characteristics include: static transfer function, static characteristic curve, instrument coefficient, outflow coefficient, flow range (range), linearity, sensitivity, hysteresis, stability, zero drift, repeatability, accuracy and pressure loss, etc. 2. Dynamic characteristics: It refers to the time response or frequency response characteristics of the output value when the input value of the measured object changes rapidly. (1) Time domain When the input value of the measured object is a step signal, the time response characteristics of the output value. Its quality index can be expressed by time constant. The time constant refers to the time when the output value reaches 63% of the steady-state value, represented by S. (2) Frequency domain The frequency response characteristics of the output value when the input value of the measured object changes according to the frequency of the sine wave. The characteristic that the ratio of the output value of the flowmeter to the input value changes with frequency is called the frequency response characteristic. 3. Composition of measurement errors The characteristics of flow measurement errors can be divided into systematic errors, random errors and gross errors. 1. Uncertainty of measurement (1) Type A evaluation of standard uncertainty (2) Type B evaluation of standard uncertainty (3) Combined standard uncertainty (4) Expanded uncertainty (5) Measurement uncertainty Calculation and expression of degree 2. Uncertainty of flow measurement Firstly calculate the uncertainty of type A and type B of each parameter, and then calculate the combined standard uncertainty and expanded uncertainty.

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