Boiler level
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Typical medium-pressure boiler level gauges have 4 or 5: two on-site, and two or three for remote transmission. May I ask what the maximum allowable difference in the readings of several level gauges should be? Is there any standard for this? We require it not to exceed 10MM. Is that possible?
We just can’t do it, and we don’t know why.
The difference is huge; the benchmarks for on-site use and those for remote operation are different. If you get too fixated on this, it can drive people crazy.
There are generally no issues at the site; the measurements based on physical principles are accurate. The remote transmission settings need to be adjusted according to the conditions at the site – what needs to be migrated should be migrated, and what needs to be calibrated should be calibrated. . . . However, 10mm is indeed a rather high requirement
The liquid level in a boiler fluctuates depending on changes in load, the amount of water supplied, as well as variations in pressure and temperature. Therefore, for large boilers, three-element control is necessary in order to eliminate the impact of false water levels on the safe operation of the boiler. As a result, it’s unlikely to achieve a measurement accuracy of 10 mm, unless the boiler operates very stably with no changes in parameters such as load, in which case an accuracy of 10 mm can be achieved.
Under changing operating conditions, level gauges based on different principles exhibit varying performance； There are also errors in the references of different level gauges on the equipment.
They want to kill people; they won’t listen to any reason at all. So, once relevant standards and specifications are found, they can be used as a reference for implementation
It’s said that in theory there’s no problem, but in practice no one can be sure
It might be possible at first. However, after long use, the pressure guide tubes get clogged with scale, causing the various level gauges to respond at different speeds. 10MM is simply fantasy. 10CM is already very difficult.