What should be done if a magnetic flap level gauge with remote transmission gives inaccurate readings?
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I’m not sure what type of remote sensor you are using. If there isn’t a significant error in the 4–20mA signals transmitted remotely, it indicates that the float does not correspond to the actual liquid level; this could be due to the float being stuck or moving poorly； If the data shown on the visual gauge corresponds to the actual liquid level, but the electrical signal does not reflect the correct value, then there is a problem with the sensor or its installation ； If you think the precision is not sufficient, you can replace it with a transmitter based on the magnetostrictive principle, which can be attached to the outer wall of the flap cylinder; its precision can reach 1 mm
This one comes with a transmitter; by recalibrating it, the accuracy can be improved, but not to a very high level. For gauges of this type, there are many factors that affect their performance, such as the density of the medium and pressure, among others
Firstly, for the tilt-type level gauge with remote transmission, there are many types of remote transmitters available: those based on reed switches, magnetostrictive technology, guided wave radar, and radar. It is necessary to indicate what type of transmitter it is, as well as what the status is shown on-site. If the on-site display is inaccurate, then the remote reading will certainly also be inaccurate. If it is accurate locally but not remotely, re-check the transmitter. If it’s not allowed even in situ, the reasons are as follows: 1) Medium-related issues, especially during operation, where the density of the medium or other factors differ from those specified in the design, resulting in errors in the calculations related to the floating ball compared to the actual conditions. 2) The float in the level gauge chamber gets stuck or does not function properly due to viscosity or impurities in the medium. 3) The actual length of the float is used, or the product is of poor quality, which causes the permanent magnet inside the float to fail and leads to measurement issues.
What to do? Serve it cold. Just switch to another one. If the magnetic flap display is inaccurate, it’s due to an inaccurate local display; if the remote transmission is also inaccurate, then it means your float ball is stuck. If the remote reading value does not match the local value, either there is a problem with the transmitter or there is an issue with the signal cable.
Another possibility is that there is a leak in the float weld, preventing the float from rising, and thus the liquid level becomes inaccurate. :Lol, and also the cut-off valve in front of the magnetic flap level gauge isn’t open. . .
You can try measuring the resistance value; that way you can determine whether the reed switch is damaged……
Yuan Fang can no longer see; Yuan Fang is blind
We are using a magnetic flip switch with a remote-controlled reed switch. First, we ensure that the float ball functions properly and rule out any possibility of it getting stuck. Then, we move a magnet over the reed switch to see whether the milliampere value output corresponds to the position of the magnet on the reed switch; if not, adjustments can be made by turning the zero and range knobs on the transmitter.
Master, this is exactly the problem we’re facing now: when the liquid level is above 70%, moving the magnetic rod allows it to be synchronized with the DCS, but once the level drops below 70%, no matter how much the magnetic rod is moved, the DCS display doesn’t change