Orifice plate flow meter
Thread Content
The orifice flow meter used for measuring gas in our system shows an excessively high reading. When we went to the site to check the zero point (with the valves in the positive and negative pressure chambers closed and the balance valve open), the gauge indicated 51%. We suspect that there is some blockage somewhere. But asking about the process shows that the medium is very clean and is a gas, so there will be no blockage. Then we arranged the liquid in the header row. The final result shown in the table is correct. Why doesn’t the header reset to zero? And when I check the traffic after a few hours, it’s not stable and keeps increasing slowly. What’s going on? Is there something wrong with the meter? I’d appreciate some advice from those who know more about this
“After adjusting the header level, things returned to normal; it will gradually increase in size going forward – I guess there is fluid accumulation in the pressure guide tube (for positive pressure measurement)......
Check the set range; try adjusting both ends to the atmospheric pressure level to see if it can return to zero. Generally, the zero point doesn’t drift that much
Is there a problem with the three-valve assembly? If not, just open it up and take a look
Three steps to repair a watch: measure, disassemble, replace； Here, we can proceed with the third step first: try using a new table of the same type to see how it displays. If everything works fine, then it’s a problem with the table; otherwise...
With the valves of the positive and negative pressure chambers closed and the balance valve open, and after removing the plugs on both sides for exhaust, the gauge still does not return to zero
Posted by Peng Jun on 2016-8-2 18:43: The three-valve assembly should be fine; tests on it showed normal performance
The orifice plate flow meter is a differential pressure flow meter. In your case, both the positive and negative pressure chambers are closed, and the discharge valve is open while the balance valve is open. If it returns to zero, then the meter is functioning properly; if it does not return to zero, either the meter is defective or the valve assembly is blocked.
First, check whether the gauge header is in good condition and zeroed out; it must be zeroed with nothing connected It’s just about removing the header and then setting it to zero! Second, your installation method! The gas pressure guide tube must be installed at an upward angle! If there is fluid accumulation, it will flow back into the pipeline automatically! It won’t affect the measurement! I also suggest that you check whether your method of operation is correct!