Square root range of orifice flow meter
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For the selection of orifice plate flow meters, the root-mean-square range is as follows: (1) The full-scale reading is 0–10 root mean square; (2) The range reading for the maximum flow rate should not exceed 9.5; (3) The range reading for the minimum flow rate should not be less than 3. Question: How should the root-mean-square range be understood? Give an example!
The square root range refers to the flow rate range that can be measured by the flow meter, and it is usually expressed in terms of the square root. For example, if the square root range of a orifice flow meter is 0–10 square roots, then its measurable flow rate range is 0 to 10 cubic meters per hour. When the flow meter reading is between 0 and 10 square roots, it can measure the flow rate within that range. The range reading for maximum flow is 9.5, which means that at the maximum flow rate, the gauge reads 9.5 square roots, corresponding to a flow rate of 9.5 cubic meters per hour. Similarly, the range reading at the minimum flow rate should not be less than 3; that is, at the minimum flow rate, the gauge reads 3 square roots, corresponding to a flow rate of 3 cubic meters per hour. .
I don’t know what this is written as; it’s better to ask the original author directly
This post was last edited by xxkhc on 2023-4-13 at 17:00. It can be understood as follows: the maximum flow is 95% of the full scale, and the minimum flow is 30% of the full scale. Note: the algorithm I provided earlier was incorrect!
1. For differential pressure flow measurement, the pressure difference value needs to be taken to the square root. The unit of flow rate should not be the square root; the square root is merely a calculation method. 2. Square rooting can be performed either within the transmitter or in the DCS or secondary instrument, but it can only be done once. 3. The 4-20mA standard signal essentially transmits a percentage value. Taking the square root also involves taking the square root of the percentage of the differential pressure value. After taking the square root and multiplying by the range, the displayed value is obtained.