If the reading of the pressure-transmitted level gauge on a given day is higher than that of the previous day, what could be the reason?
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Pressure transducer-based automatic level gauges are used in the underground tanks of gas stations. The reading on the first day, after passing through the night, was 1 centimeter higher when it was measured at the scheduled time the next morning. Experts are requested to analyze the reason for this. Thank you.
Is it zero drift of the pressure-transmitted level gauge?
You Sheng has had a second child:lol:lol:lol
What are the range options for level gauges? At 10 meters, if it drifts by 1 cm, that’s only 0.1% FS,,, it’s like having small eyes – nothing surprising about that
Could it be that the large temperature difference causes errors due to different densities?.....
The underground tank at the gas station is 1.6 meters high.
The temperature difference in buried tanks isn’t very large; the current temperature is between 1 and 6 degrees.
I don’t understand the reason, so I’m asking the experts here
For pressure sensors, when the range is large, the technical challenges are practically non-existent; even something as simple as a pig’s foot can be used to create a sensor that is both stable and accurate. On the other hand, the smaller the range, the more difficult it is to work with such sensors – it’s even harder than dealing with dogs or little people. . . A 1.6-meter oil column results in a pressure of around 13 kPa, which is considered low pressure. . . If you are using a differential pressure gauge of the type with a flat face and double flanges, then a total drift of 1 centimeter is considered normal as well
Furthermore, if the pressure sensor is perfectly stable and idealized, then the changes in density and volume caused by thermal expansion and contraction of the liquid will not result in any changes in the measured pressure; in other words, the value of (mass·h) in the formula for the static pressure method is a constant
Comprehensive sensor drift includes zero-point drift, zero-sensitivity drift, thermal drift and its uncertainty, as well as time drift. . . It is not a fixed value