Pressure Measurement: Big vs Small Diameters

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Discussion Overview

The discussion revolves around the effects of transmission line diameters on pressure measurement, specifically focusing on the differences between large and small diameter measurement lines in the context of electrical sensors, particularly transducers.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant inquires about the effects of transmission line diameter on pressure measurement values.
  • Another participant asks for clarification on the type of measurement being discussed, suggesting different sensor types could influence the discussion.
  • A participant specifies that the focus is on electrical sensors, particularly transducers.
  • It is noted that standard 4mA-20mA sensors can yield the same readings over long distances due to corrected resistance values, implying that distance may not significantly affect measurements in certain conditions.
  • One participant highlights that long thin tubing can dampen pressure fluctuations, making it unsuitable for measuring unsteady fluctuations, although this may not be an issue if only time-averaged values are of interest. They also mention that the size of the tubing may affect the time it takes for pressure to stabilize after a change.

Areas of Agreement / Disagreement

Participants express differing views on the impact of transmission line diameter on pressure measurement, particularly regarding the measurement of fluctuations versus time-averaged values. The discussion remains unresolved with multiple competing perspectives.

Contextual Notes

There are limitations regarding the assumptions made about the types of sensors and the specific conditions under which measurements are taken, which may influence the outcomes discussed.

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What is the effect of transmission line while measuring pressure value? I want to learn difference between big and small diameter of measurement line (transmission line).
 
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What kind of measurement are you talking about? Electrical sensors? Mechanical Sensors? Liquid or gaseous?
 
Electrical sensor. Let's say transducer.
 
Well I have seen the standard 4mA-20mA sensors give exactly the same readings at 1m and 200m because of the corrected resistance value for such a long wire.
 
One of the most important effects is how the line influences the transmission of pressure fluctuations. Long thin tubing usually cannot be used to measure unsteady fluctuations because the fluctuaions get damped out by the tubing. But if you are only interested in time averaged value this isn't not a problem but the size may still effect the time it takes for the pressure to stabilize after a change in the pressure.
 
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