I would like to ask the experts about the faults of electromagnetic flowmeters and how to deal with them
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Last night there were 4 tasks on the night shift; I knew how to handle 3 of them, but I was unfamiliar with one electromagnetic flowmeter. Firstly, the combustible gas alarm gives an alarm; its zero point can be calibrated according to the instructions. I would like to ask the experts: can the zero point of a combustible gas alarm be calibrated in the atmosphere? Previously, I rarely came into contact with such watches. Secondly, there was no power at the buoy site. A 24-volt power supply was available on-site, but the buoy didn’t function; later it started working again. It was determined that there was a problem with the buoy’s power board. During the next shift, the wiring was checked; since there were no issues with the wiring, the power board of the buoy was replaced. Thirdly, two three-way solenoid valves control the cylinder valve; the exhaust ports of these solenoid valves are used for regular air release. As for the air supply, the possible issues are either a problem with the solenoid valves or a leak in the diaphragm of the cylinder valve. Since no new solenoid valves are available, the issue has not yet been resolved. Finally, there was an electromagnetic flowmeter in Cologne that wasn’t giving any readings. When I went to the site, I had no experience working with electromagnetic flowmeters, so I had no choice but to turn off the power and restart it – and it worked again. I admit I was confused; I would like to ask the experts here: what are the common faults of electromagnetic flowmeters and how should they be dealt with? The temperature has risen, and there are fewer freezing conditions, so it’s possible to do some work that requires technical skills. I’m also willing to take on tasks I’m not familiar with, as this helps me improve. The field of instrument maintenance is vast, and I’m always in the process of learning. First of all, I’d like to thank all the masters who have guided me
Hello. 1. If a combustible gas alarm goes off, it is necessary to use a portable detector for on-site testing. If the alarm continues to sound even though there is no combustible gas present, the issue lies with the detector’s sensor; it is recommended to replace it and calibrate it. The zero drift of the on-site alarm can be calibrated, but only if the amount of drift is not significant. 2. (There is no power at the float site; 24 volts of power is available on-site.) I don’t understand this. 3. To determine whether the issue lies with the solenoid valve or the diaphragm, a simple method is to connect the air supply directly to the air inlet of the cylinder and check whether air comes out of the exhaust port. 4. If you have no prior experience with electromagnetic flowmeters, it is recommended that you start by learning about their working principle; merely looking at common faults will not help you understand them. The power-off and restart you mentioned is the most common solution; by turning off the power, the fluid removes the impurities adsorbed on the electrodes. There are also common instrument fluctuations, as well as issues related to the grounding wires. The above
Thank you for your detailed response; I’ve learned a lot from it. Apologies regarding that float – I didn’t explain it clearly enough. The meter display doesn’t show anything; there’s a black screen. When using a multimeter inside the terminal box, 24 volts are detected. Thank you once again for taking the time to analyze things for me so patiently; it’s been of great help to me. I must work harder on my on-site tasks in order to repay those who have helped me.
The electromagnetic flow issue might be related to grounding problems; check whether the site is properly grounded, and ensure that the enclosure is well grounded to see if the problem persists.