The effect of atmospheric pressure on pressure measurement
Thread Content
When measuring micro-positive pressure/micro-negative pressure, how significant is the impact of atmospheric pressure changes on the measurement results? Assume that the change in atmospheric pressure is above 1.5 kPa.
Using the differential pressure method results in an error of 1.5 KPa. Absolute pressure gauges do not have such problems.
Reply to 2# backhamm1982: Is it okay to use a gauge pressure meter?
It is related to the resolution of the pressure transmitter; even using an absolute pressure gauge, there will still be some issues. After all, what you want to measure is the differential pressure, and if you calculate it by subtracting the readings of two gauges, the error will be even greater. Rosemount does the best work in terms of micro-differential pressure; it can measure values from 0 to 25 Pa, with a very high resolution
During on-site measurements or experiments, if the air pressure is unstable, such as in the presence of a slight breeze, it has a significant impact on the measurement of differential pressure. Especially when the differential pressure range is below 400 PA, this leads to irregular fluctuations in the readings, making it even more difficult to adjust the zero point and the range accurately. If it is above 500 PA, the impact is not so significant.
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It mainly depends on what device or apparatus is being measured. If it is an open-container, using a differential pressure gauge directly is a good option, as this can completely counteract the effects of changes in atmospheric pressure. If it is a closed container, it is better to use a gauge pressure meter, so that atmospheric pressure does not affect the measurement results.
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