Differential pressure flow meter
Thread Content
Working principle of multi-variable differential pressure flow meters with temperature and pressure compensation – is it necessary to take the square root in such flow meters?
It is possible to choose whether to square root it by the transmitter. Since things like temperature and pressure compensation are already available, a square root function must also be present.
It’s not about whether to include square root functions or not. For example, in the case of multi-variable transmitters used in differential pressure flow meters for measuring steam, is it necessary to use square root functions for temperature and pressure compensation? And for transmitters that do not have temperature and pressure compensation, is it possible for the system to provide such compensation?
It’s generally not necessary, but it’s a good idea to check the parameter settings of the multivariable transmitter
1. Square root must be applied to any differential pressure flow meter. It is possible to perform square root calculation on the transmitter, or it can be done by the secondary meter that follows, whether it’s an integrator or a DCS – all of these can carry out square root functions ； 2. Even without temperature and pressure compensation in the transmitter, subsequent secondary instruments, whether it be accumulators or DCS systems, can still perform temperature and pressure compensation.
A square root operation is likely required, as there is a square root relationship between flow rate and differential pressure; this seems to have nothing to do with temperature and pressure compensation.
Multi-parameter transmitters do not require a square root setting; there is no such option available during configuration (you can think of it as having a built-in square root function by default), and what it outputs is the flow rate after compensation. For ordinary differential pressure transmitters, the output signal needs to be squared, and this can be done either by the transmitter or by the host computer.
A square root calculation is required; it’s just necessary to decide whether to perform the calculation using the table header or via the system
The differential pressure flowmeter value must always be squared rooted. It is possible to choose to take the square root at the on-site meter header, at the secondary meter, or via DCS; just one of these methods for taking the square root is sufficient.
It is a multivariable differential pressure transmitter with temperature and pressure compensation; it is not an ordinary differential pressure transmitter
I think what was said on the 6th floor is correct