Error classification of LUGB steam flowmeter
蒸汽流量计的误差分类各种误差的不同特性 Error classification of LUGB steam flowmeter
Steam flowmeter is a special instrument for measuring the cumulative mass flow of steam. It has two types of structure: mechanical and intelligent. It can be displayed on the indicator dial (mechanical) or liquid crystal display (intelligent) on the spot to accurately read the The quality of all the steam of the meter can also output pulse signals, and it has the function of manual pressure compensation or automatic temperature compensation. Due to its simple structure, moderate price, and wide measurement range, it is widely used in petroleum and petroleum, chemical, textile, and heating applications where steam flow meters are required. For its measurement, there will be a certain degree of error. Different errors also have different characteristics.
、系统误差，指的就是测量器具或方法引起的有规律的误差，体现为与真值之间的偏差，如仪器零点误差，经年变化误差，温度、电磁场等环境条件引起的误差，动力源引起的误差等。 1. Systematic error refers to the regular error caused by measuring instruments or methods, which is reflected as the deviation from the true value, such as the zero point error of the instrument, the error over time, the error caused by environmental conditions such as temperature and electromagnetic field, power Source-induced errors, etc. The absolute value and sign of this error remain unchanged, or the error follows a certain functional relationship when the measurement conditions change. Systematic errors After mastering the causes of errors, the instrument can be calibrated and the test environment changed to check to find out the value of the system error and try to eliminate it. For example: the angular velocity measurement error caused by the eccentricity of the turntable changes according to the sine law. Aligning the center can eliminate this error.
、随机误差，除了可以排除的系统误差外，另外由随机因素引起的，一般无法排除难以校正的误差被称为随机误差。 2. In addition to the systematic errors that can be excluded, random errors are also caused by random factors. Generally, errors that are difficult to correct are called random errors. Repeated tests under the same conditions can find that the probability of random errors obeys the law of statistical analysis. The error theory is based on this law of random errors. Statistical analysis is performed on a limited set of data to estimate the knowledge of measuring true values. The characteristic of random error is that the sign and size of the error are changing at any time. There are many factors that affect this error, and each factor has only a small effect on the measured value. The random error is caused by the sum of these small effects. Although some factors that generate random errors are known, such as the degree of air dryness, purification degree, and the size or direction of the air flow, they have a small effect on the measurement results, but they cannot be accurately controlled. In addition, there are some factors that generate random errors that cannot be determined.
、粗大误差，指的就是由于观测者误读或传感要素故障而引起的人歧异误差。 3 , gross error, refers to the human error caused by the observer misread or sensor element failure. Such errors should be avoided in the measurement. The measurement value with gross error is called bad value. It can be judged whether it is a bad value or not according to the criterion of statistical inspection method. The bad value should be eliminated. There are certain rules to exclude such errors.
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