Regarding differential pressure flow meter issues
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What should be taken into consideration during the initial installation and calibration of a differential pressure flow meter equipped with three sets of valves? Is it acceptable for there to be bubbles in the pressure guiding tubes? Are there any differences between models with and without a condensation tank?
First of all, there must be no bubbles in the pressure guiding tube; those equipped with a condensation tank can reduce fluctuations
Measuring steam requires a condensation tank.
Come and learn* it; it hasn’t been debugged yet···················
You can refer to the instrument installation manual for the installation piping.
Before installation and commissioning, the flow meter must first be calibrated using a standard device in a static state. During commissioning, the balance valve should be opened first to fill it with condensate; when filling it with condensate, the exhaust port must be opened to allow gas to escape, and it should be closed after all the gas has been expelled. The balance valve must be closed when putting it into operation. The condensation tank is used to reduce liquid loss in the positive and negative pressure pipes, thereby improving the accuracy of measurements. However, today’s transmitters measure very small displacements of the diaphragm chamber, so measurement errors are not significant even without a condensation tank.
Instead of using a tank to collect the condensate, the medium vapor is allowed to condense directly into water – what kind of exhaust system is that?
The last edit to this post was made by cqdfwy on 2016-9-16 at 10:58. 1. If the transmitter is turned on, one has to wait for the medium vapor to condense into liquid water; if one does not wait for this condensation to occur, the transmitter will get damaged due to overheating； 2. If the transmitter is not turned on, and one waits until the medium vapor condenses into condensate before turning on the gauge, then how long will that wait take? 3. And by relying on the medium vapor to condense into condensate water, can it be ensured that the vapor condensation rate in the positive and negative pressure pipes remains constant at all times? Not necessarily. Therefore, water is usually poured directly into the condensation tank (while paying attention to exhaust), which ensures that the water levels in the positive and negative pressure pipes are equal; as a result, the additional pressures acting on the positive and negative chambers of the transmitter cancel each other out, ensuring accurate measurements. It also ensures the operating temperature of the transmitter.
Bubbles are not allowed; those equipped with a condensation tank must have the isolation fluid installed in advance.