How were differential pressure level gauges and flap level gauges converted before?
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There is a horizontal tank on site, equipped with a flap level gauge and a differential pressure level gauge; both send their readings to the DCS. The range of the flap gauge is 2 meters, while that of the differential pressure gauge is 3 meters. Due to the installation location, the zero point of the flap gauge is about 20 cm higher than that of the differential pressure gauge. Last week, experts inspected the setup and requested that adjustments be made so that the readings become more similar. How can this be adjusted? On the instrument or on the DCS?
Differential pressure level gauges and flap level gauges have different measurement principles, so they cannot be directly converted into one another. If it is necessary to convert the readings of the two types of level gauges into one another, factors such as the characteristics of the instruments and their errors must be taken into account, along with appropriate calibration and adjustments. In such cases, it is recommended to have adjustments and calibrations carried out by a professional instrument maintenance company or the instrument manufacturer in order to ensure accuracy and reliability. The specific methods and steps for making adjustments depend on the particular circumstances, and it is advisable to consult relevant professionals. During the adjustment process, attention must be paid to safety and stability to ensure that the level gauge performs as required. In practical applications, it is also recommended to use liquid level gauges of the same type as much as possible to avoid errors and operational difficulties. .
The zero position of the magnetic flip switch is used as the zero point of the range. The differential pressure level system maps a range of 20 CM to -20 CM up to the full scale. But the range of -20CM-0 doesn’t look good, so small-signal rejection is applied to remove it.
Was this resection done on the surface?
The ranges of the two level gauges are different; even if their zero points are set to the same value, there will still be a discrepancy if the transmitted values are displayed as percentages. Wouldn’t it be sufficient to, in addition to adjusting the zero points, also add a display in millimeters for the level readings within the DCS?
First, determine whether the lower flange positions of the two level gauges are at the same level
It is achieved by changing the transmitter range and offset to match that of the magnetic flap.
The upper and lower flange connections of the magnetic flap level gauge are connected in a tee configuration, which allows the pressure difference level gauge to be installed in a different location; other factors such as the pressure difference range have no impact, and the total height remaining unchanged still results in a difference.
It’s best to use DCS; it’s also simple, and you can view the actual values through the backend.
Sure. Check the requirements for process inspections or external expert reviews.
Does DCS increase the display in mm? How should this sentence be understood?