How can the maximum flow rate that can be measured be determined for a differential pressure flow meter that is already in use?
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How can the maximum flow rate that can be measured be determined for a differential pressure flow meter that is already in use? An Anubas differential pressure flow meter for measuring air flow has been put into use. Its operating range is 0–9000 Nm3/h, corresponding to a differential pressure of 0–1 kPa. The differential pressure transmitter can measure up to a differential pressure of 2.5 kPa. Using the known values – an operating range of 0–9000 Nm3/h corresponding to a differential pressure of 0–1 kPa – and the formula stating that flow rate is proportional to the square root of the differential pressure, the proportionality constant was determined to be 9000. By applying this value of 2.5 kPa to the formula, it was calculated that the maximum flow rate that the transmitter can measure is 14220 Nm3/h. Is this calculation correct? It seems that the throttling element was not taken into account at all during the calculation process.
The throttle element may not be able to expand by that much; it is necessary to consult the manufacturer of the throttle element to find out how much expansion is possible.
The maximum differential pressure that can be measured by the differential pressure transmitter is 2.5 kPa; this has nothing to do with the maximum flow rate, but rather relates to the orifice plate
The range is calculated in li in this way; I’m not sure what happens when it exceeds the range. The key point is that this isn’t a standard throttling device. Is the pipe diameter DN350?
I’m not sure if I understand correctly – the range of the measuring element is 0-1, while the range set for your transmitter is 0-2.5? That’s a problem – the range of the transmitter must match that of the throttling element. The transmitter serves only as an auxiliary device, used to measure the differential pressure across the throttling element and display it to you. It is the throttling element that determines what the differential pressure will be. So how did you manage to set the flow rate range to 14220? The maximum flow rate is 9,000. If you measure a differential pressure of more than 1, it indicates that there is an issue with the throttle element you selected
Even as a single problem, it’s not a difficult one at all. 2.5 kPa is way too low; if the differential pressure transmitter is replaced with one that can handle 250 kPa, then it’s no problem at all – just calculate it using the formula. {:2_32:}
Is 1 kPa that low? It’s specified in the calculation sheet – there it shows the maximum flow rate that Aniuoba can handle
The method is incorrect; it’s possible to make estimates for liquids, but it’s more complicated with gases
You can contact the manufacturer of the throttle element; they will be able to calculate it for you and determine a new range based on your hole dimensions
If the measurement range is expanded and accuracy cannot be guaranteed, it can only be used as a reference value: lol
It can be expanded a bit, but the error will increase as well; there’s nothing wrong with the original calculation by the poster. But if accurate data is required, it still needs to be calculated or calibrated by the manufacturer. The wear of the orifice plate also increases.