Why doesn’t the orifice plate flow meter return to zero without a flow transmitter?
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Can I adjust the zero point directly using 475? Close the positive and negative pressure root valves and vent to ensure atmospheric pressure. Can we reset to zero?
The orifice plate flow meter needs to be zeroed out during regular inspections, and a 475 can be used for this.
Sure, a more practical approach is to perform small-signal rejection in the DCS. .
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The gauge of the double-flat flange level gauge does not return to zero; can I use 475 to reset it to zero? Why can the flow rate be reduced to zero even with the same pressure difference?
For zero-flow calibration, it is necessary to close the positive and negative root valves, open the balance valve, and open the vent valve. The liquid level can also be zeroed for calibration, but it is necessary to ensure that the actual liquid level is currently at zero.
The liquid level can’t be used, right? If the actual liquid level is zero while the remote liquid level measurement via double flat flanges shows 10%, will zeroing it using 475 affect subsequent measurements?
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For double flanges, one of the flanges needs to be removed so that both flanges are at the same level, after which they can be reset.
If it still doesn’t return to zero after opening the balance valve, then disassemble the differential transformer to check whether there is anything stuck to the diaphragm.
Are you sure there is no flow in the pipeline? Close the positive pressure valve and negative pressure valve of the three-valve assembly, open the balance valve of the same assembly, and open the drain valve to empty the medium. At this point, check whether the transmitter is at zero It needs to be reset if it’s not at zero. There are many ways to reset it; Rosemont meters come with a built-in reset button, while Yokogawa models have an adjustment screw. Or reset to 475. If you can’t do these yet, then use the translation range; this is generally not recommended.