Are there any simple and easy-to-understand calculation methods for the level and flow migration amounts of differential pressure transmitters?
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Level and flow rate are measured using differential pressure transmitters. Is there a simple formula for calculating the migration amount? Please let me know, and you can send it to my email address: 919472833@qq.com
Have you considered why there is a migration volume? I’ll take the liquid level as an example: when there is no liquid in the tank, the positive and negative pressures are equal, so the pressure difference should be zero. But in reality this is not the case, because there is silicone oil inside the capillary, and even a small amount of it creates pressure. Therefore, the pressure inside the capillary is equal to the amount of migration; since no migration occurs, when the liquid level is at zero, the negative pressure reading is higher than the positive pressure reading. The transmitter displays a negative value, which represents the amount of migration; as for the exact value, it is the density of the silicone oil multiplied by G multiplied by the distance between the centers of the flanges. Of course, this is a level gauge; if it’s a boundary level gauge, the calculation is different.
Measure the height difference of the flanges, and then PGH is obtained. The density refers to the density of silicone oil; it’s very simple
I’d like to ask: at which stage of the project is level migration carried out? Because the actual installation location needs to be taken into account; should the instrument be installed first and then moved to the site?
Once the construction team has completed the installation of the transmitter pillars, the transmitters need to be moved. Of course, it’s also possible to delay this until before the trial operation; if delaying does not affect the trial operation, then moving them at that time is also fine. In any case, it’s from after the transmitter is installed until the moment this gauge must be used
Flange center distance in decimeters multiplied by density plus the current zero-point pressure
If it is during the construction phase, it is necessary to first complete the installation, then connect the wires; after that, the wires need to be checked, power is supplied to the system, and only afterward can debugging take place. If it is a replacement, it is simpler – once the replacement is done, the wires are connected, power is supplied, and debugging is carried out.