Relationship between instrument range and scale range
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The analog signal of 4~20mADC output by a rotameter corresponds to the instrument’s range, not its scale range; is it correct to say that the scale range is wider than the instrument’s range? For example, the operational parameter for a rotameter is 500 l/h, with a range that can be set between 0 and 600 l/h (this setting is suitable when a small flow rate is required, such as during gradual addition of fluid). The corresponding analog signal output is in the range of 4–20 mADC. Alternatively, the rotameter’s scale range can be set between 0 and 800 l/h, which improves measurement accuracy while still ensuring that the instrument’s indication falls within its acceptable range. The signal cannot be transmitted when it exceeds 600 l/h. Does this selection meet the design selection specifications?
The scale range should be the same as the measurement range, right? The range of a rotameter is fixed.