Rangeability, also known as turndown ratio or range ratio, is a term used in instrumentation to describe the ratio between the maximum and minimum values that a measurement instrument can accurately and reliably measure.
In simpler terms, rangeability indicates the ability of an instrument to accurately measure a wide range of values within its operating range. It is particularly important in applications where the measured quantity can vary widely or where the full range of measurement is not always utilized.
For example, consider a pressure transmitter with a range of 0-100 psi. If the transmitter has a rangeability of 10:1, it means that it can accurately measure pressures ranging from 10 psi (the minimum value) up to 100 psi (the maximum value). Similarly, if the same transmitter has a rangeability of 100:1, it can accurately measure pressures from 1 psi to 100 psi.
Rangeability is typically expressed as a ratio, although it can also be represented in terms of decibels (dB) in some cases. A higher rangeability indicates a greater flexibility and capability of the instrument to measure a wide range of values accurately.
The concept of rangeability is important because it allows for the selection of instruments that can accommodate the full range of process variations, ensuring accurate measurement under different operating conditions. It also helps in optimizing instrument selection for specific applications, reducing the need for multiple instruments with different ranges and improving cost-effectiveness.
In summary, rangeability is a measure of the flexibility and capability of an instrument to accurately measure a wide range of values within its operating range, and it plays a crucial role in instrument selection and performance in various industrial and engineering applications.
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