Zero drift of the plug-in Diyuan electromagnetic flowmeter
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Rainwater drainage pipe, with a diameter of 12,000 mm; an insert-type Diyuan electromagnetic flow meter is used. When the rainwater valve is closed, the instrument emits an alarm indicating an empty pipeline. After this alarm stops, the flow rate of the flow meter ranges from 1,000 to 2,500 m3/h. The flow meter is inserted directly above the pipe; the outlet of the rainwater pipe slopes slightly downward, with the flow meter located at the center of the pipe. Help, how should a flow meter be set up? Is on-site modification required, such as welding in baffles to raise the liquid level or inserting the electrodes deeper?
Personally, I think: 1. Check the ground shield wire; 2. Perform calibration with the tube fully filled; 3. Try turning off the low-signal cutoff. Please keep me updated if there are any changes.
:funk: Such a large diameter
Currently, small-signal cutting is used; the default value at factory setup is 120 m3/h, but it has been changed to 2600 m3/h. It is generally kept at 0, with occasional fluctuations below 100 m3/h. It’s not realistic to fill the pipe completely; the water level in the river isn’t that high. I’ll take another look at the grounding wire
Insertion-type electromagnetic flowmeters are inaccurate; you should use a channel-type flowmeter instead. Moreover, the electromagnetic flowmeter affected by air traffic control conditions will experience fluctuations in flow rate, so it should not be used as a reference.
Insertion-type electromagnetic flowmeters are generally inserted to a depth of 1/10 of the pipe’s inner diameter. If the actual minimum flow rate is higher than 1000–2500 m3/h, small-signal rejection can be applied. If it is greater than this value, you can go to the menu and check the \"Air Traffic Control Alarm Threshold\" option, then reduce the threshold. The air traffic control alarm is on; do not turn it off. Let’s see how it works.
The air traffic control alarm threshold – we have tried values ranging from 5000 down to 500, 50, 5, and 0.5 – yet there is still fluctuation in the flow rate
No, pull it out to take a look; remove the pipe without turning off the power, and check if there is still flow. There will still be flow even if air is trapped inside the pipeline and cannot be expelled