I have a question regarding the squaring operation for differential pressure flow transmitters.
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Are differential pressure flow transmitters all subject to square root calculation in the DCS, or is the square root calculation done within the transmitter itself? Which one is more commonly used, and what are the advantages of each?
The intelligent type can perform square root calculation within the transmitter
Where to take the square root mainly depends on your and your engineers’* habits; there’s no significant difference. But be careful to avoid taking the square root twice
Sorry, one is missing. Only intelligent differential pressure transmitters have open functions.
Generally, imported transmitters have their outputs calculated internally (the configuration is relatively complex), and these outputs are linearly related to the system’s range. For example, the Rosemount 3095 transmitter is designed specifically for use with orifice plate flowmeters, so no additional settings are required in the system. However, some domestic manufacturers of orifice plates do not have this internal calculation capability; their output is simply a linear function of the differential pressure measured by the transmitter. Therefore, it is necessary to take a square root in the DCS
We use taking the square root on the transmitter.
Transmitters can now basically perform square root calculations. But to be honest, taking the square root a second time is quite common on site, especially after renovation projects or repairs; it’s easy to end up taking the square root a second time or failing to do so.
All intelligent transmitters can perform square root calculations, just like on the DCS
A set of devices should have consistent practices: either all square roots are calculated on-site or all within the system; performing square roots twice is indeed quite common
Where to take the square root depends on the contract provisions; it’s not up to one to decide where. . .
Smart transmitters can perform square root operations internally; just specify this when placing the order, as it makes things more convenient. Differential pressure transmitters display values in a linear relationship with flow rate, so it’s best to have square root operations performed within the transmitter – transmitters from EJA are suitable for this purpose. We all use square roots taken inside the transmitter.