Height of the level gauge
Thread Content
When reviewing the equipment layout diagram, I noticed that the remote and local level gauges were at the same height. Based on my experience, I advised them to increase the range of the local level gauge, and they asked me why. Yes, why is that? What is the basis?
Although the specifications are not known, in most cases, the level gauges used on site come with remote transmission capabilities; however, there are exceptions. One thing to keep in mind is that even if they are at the same height, the interfaces should be separate from each other.
It seems there’s no basis for it, and the issue with the same height isn’t a big problem either.
It is set according to the process requirements; it is also acceptable for the pressure tapping points to be at the same height. However, the viewing range of the local indicator (such as glass panels or magnetic flip switches) will be smaller than the measurement range of the remote transmitter, and the local indication will not be visible at low and high liquid levels.
Does the poster mean that the two level gauges are installed at the same location and have the same range, with the local measurement range being doubled? It doesn’t seem like there’s any place that has such a requirement; what’s wrong with having consistent ranges?
No, for example, when they are both at 2.5 meters.
I can’t understand what the original poster is trying to explain. There’s nothing wrong with the remote and local level gauges being at the same height; what does it mean to increase the range of the local level gauge?
For example, the outlet ends for long-distance transmission are located at 2 and 5 meters respectively. I think those on-site can be placed at 1 and 6 meters respectively for easier observation. For the specific reasons, see Floor 4.
The description on the 4th floor is also inaccurate; if the liquid level is below the lower flange opening, it will not be displayed, whether it is measured locally or remotely.
Are you setting questions? The on-site value is generally not the same as the remote value; the on-site value is higher to facilitate observation.
This post was last edited by Awui Lingshan on 2015-7-29 at 16:34. The digital readings of a DCS are related to control operations, so the range values are set more conservatively; as a result, the range of the instruments on-site is relatively larger (for example, the range for level measurements isn’t set as conservatively, which might lead to damage to the pump). On the other hand, when the DCS shows a level reading of 0, it’s possible to go to the site to check whether there is still some liquid left in the tank. However, this is just the standard practice – it’s not a problem even if the ranges are the same. Some engineering design companies may specify certain practices, but this isn’t absolutely necessary (and it’s not necessarily better either)