Regarding float level gauges
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I have only been working with instruments for a short time, and my knowledge of their principles and troubleshooting methods is still limited. Below I will describe the problems I’ve encountered: The device has two level gauges; one shows normal readings, while the other displays the minimum value. There is no short circuit, and an alarm signal appears on the gauge at the site. After the power is turned off, everything works normally for a few minutes before the alarm signal appears again.
It happened in the morning; there was another power outage in the afternoon. The device worked normally for less than 24 hours before the same problem occurred again. It worked fine after the power was restored, and it has been working properly for a few hours now; we are still monitoring the situation
I’m not sure what brand of level gauge the original poster is using; let’s talk about the K-TEK level gauges we have here. 1. If the screen shows a full or empty liquid level, first check through the operations to determine whether the tank is full or empty (although generally the operations will indicate that the process is normal). When the K-TEK is out of range or malfunctioning, it will send a signal of 4mA or 21mA; this requires manual wiring adjustments on the gauge. Isolate the float, drain the liquid level, connect a water pipe to fill the float with water, and check whether the reading changes accordingly. Fill the tank to its full capacity; if the reading is accurate, it indicates that the gauge is functioning properly. By doing this, I found that operating on an empty tank once and on a full tank once had no impact on the instruments. Hehe, in the face of facts, they still insist on stubbornly holding on to their views. 2. After a power outage, it will function normally for a while upon power restoration, or the liquid level display will fluctuate back and forth. For k-tek, I use a small flathead screwdriver to adjust the threshold voltage of the gauge head; increasing it usually resolves the issue. Personal opinion, for reference only.
It is likely that the gauge head or transmitter has poor performance; such intermittent faults are difficult to diagnose. Try replacing the gauge head first, and if that doesn’t work, then replace the transmitter.
For the LC3144LD series, there are two level gauges; one of them is more accurate and does indeed reflect the actual liquid level, while the other one shows a lower level from the very beginning
I checked the dial and didn’t see anything that could be adjusted. The 475 model can communicate, but I don’t understand how it works.:, It’s been working properly for over a day now
It has been functioning normally for over a day now; there is no transmitter, just a gauge head
It’s the float level gauge from FOXBORO in Germany, right? It should give an alarm when the device is at full liquid level, showing the minimum value; it won’t return to normal even if the liquid level drops
Yes, it’s not at full liquid level either; it seems there’s a problem with the safety barrier. After replacing the safety barrier, no issues have occurred for some time now. However, one unit gave a wire break alarm despite having no liquid level; it returned to normal after power was cut off at the site, and it is currently under observation
I’ve encountered a similar problem as well; the header shows “critical error: sys offset error value=2.431”. The error is most severe during failures, but everything returns to normal after a power reset. However, this kind of issue occurs again after a few hours. I don’t have any relevant information available to help me figure out what’s going on. Has anyone experienced this?