Pressure Measurement: Big vs Small Diameters

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SUMMARY

The discussion focuses on the impact of transmission line diameter on pressure measurement, specifically with electrical sensors like transducers operating on a 4mA-20mA standard. It is established that both small and large diameter lines can yield similar readings over long distances due to resistance correction. However, the diameter significantly affects the transmission of pressure fluctuations, with long, thin tubing dampening unsteady fluctuations. For time-averaged values, diameter size influences the stabilization time after pressure changes.

PREREQUISITES
  • Understanding of electrical pressure sensors, specifically transducers.
  • Knowledge of 4mA-20mA signal standards in pressure measurement.
  • Familiarity with the effects of tubing diameter on fluid dynamics.
  • Basic principles of pressure fluctuation transmission in measurement systems.
NEXT STEPS
  • Research the effects of tubing diameter on pressure measurement accuracy.
  • Learn about the dynamics of pressure fluctuations in fluid systems.
  • Explore advanced transducer technologies and their specifications.
  • Investigate methods for minimizing damping effects in pressure measurement lines.
USEFUL FOR

Engineers and technicians involved in pressure measurement, particularly those working with electrical sensors and transducers, as well as professionals focused on optimizing measurement accuracy in various applications.

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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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