Calculation of the measurement range for liquid level in open containers using single-flange level gauges
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A single-flange level gauge is used to measure the level in an open container. The process requirements specify that the opening of the gauge should be located 1 meter above the lowest liquid level. The range of liquid levels varies from the lowest to the highest level, with the distances from these extreme levels to the gauge being H1 = 1 M and H2 = 10.5 M respectively. If the density of the medium being measured is 1180 KG/M3, what is the range of the transmitter? ? 2. Is migration required? Is the transfer positive transfer or negative transfer? What is the amount of data to be migrated? How is the above calculated?
Measurement range: 11.564~121.422 kPa; range value: 109.858 kPa; migration is positive, with a migration amount of 11.564
After positive migration, with a pressure of 11.564 KPa, the transmitter output is 4 mA, right?
Why migrate? Even after migration, you can’t measure the liquid level below the pressure tap
What is the opening position in meters above the lowest liquid level?
So you mean that 0 pressure corresponds to a liquid level of 1 meter? Then 4mA needs to be set as negative pressure. In fact, it’s better not to touch the on-site instruments in such cases; migrating it in the DCS makes things clearer.
How to migrate in DCS? Should the lower range limit be set to 1m?