Instrument is widely used in industry, scientific research and other fields of equipment, used to measure various physical quantities, such as temperature, pressure, flow and so on. There are several important concepts to understand about the measurement of the instrument, including the measurement range, the upper and lower limits, and the measuring range.

1. measurement range

The measurement range of the instrument is also called the working range, which refers to the area or interval of the measured value that the instrument can measure. Simply put, it is the range between the minimum value and the maximum value that the meter can read.

2. upper and lower limits

1. Upper limit: the maximum value that the meter can measure, that is, the upper end of the measuring range.

2. Lower limit: the minimum value that the meter can measure, that is, the lower end of the measurement range.

3. range

Range is the size or level corresponding to the measuring range of the instrument. It is one of the core performance parameters of the instrument, reflecting the maximum physical value that the instrument can measure from zero. It is usually expressed as the difference between the maximum measured value and the minimum measured value of the meter. For example, the range of a pressure gauge may be from 0 to 100 bar. Within this range, the meter can provide accurate measurement results. The selection of the range should be determined according to the actual measurement data. Choosing the appropriate range can improve the accuracy of the measurement and extend the service life of the instrument.

4. relationship with each other

1. The measuring range is the overall range that the instrument can measure, and the upper and lower limits are the boundaries of this range.

The range is the part that the instrument can accurately measure within this range, which reflects the maximum measurement capability of the instrument. Simply put, the range is included in the measurement range.

3. Choosing the right range is the key to ensure the accuracy of the measurement. If the selected range is too small, it may cause the instrument to overload; and if the selected range is too large, it may affect the accuracy of the measurement. Therefore, when selecting an instrument, it is necessary to determine the appropriate measurement range and range according to the actual measurement requirements and the working environment of the site.

In short, understanding these concepts helps to better select and use meters. In practical application, the appropriate instrument should be selected according to the measured physical quantity and its range, and the range of the selected instrument can meet the measurement requirements, so as to ensure the accuracy and reliability of the measurement.