What is a pressure decay test?

To understand leak rate, you must know how does a pressure decay test work
 
MODENA, Italy - June 29, 2021 - PRLog -- Is a leak rate required for pressure decay testing?

It is a popular question that is asked by many people all around the world. Although a leak rate is not essential for pressure decay testing, it plays a significant role.

What is a pressure decay test?

To understand leak rate, you must know how does a pressure decay test work. A pressure decay involves two pressures; target pressure and filling pressure. The target pressure is set by the user, and it can be any value. In a pressure decay test, a pressure vessel is filled with air until it matches the target pressure.

When it reaches the target pressure, the supply of air is cut off, and the pressure is isolated. Over time, air tends to leak out, and this is called a decay in pressure. This decay is measured by a pressure sensor.

How are decay results calculated?

Medical device testers calculate the decay results through the following steps:
  • They conduct a design of experiments test through which they can get the numerous timer settings.
  • Through these numerous timer settings, medical device testers identify the consistent decay values of the final pressure, otherwise known as target pressure.
  • The timing settings they get in the first place are not ideal, and thus they improve these so they can directly improve the values of the target pressure.
  • After that, medical device testers make a distribution curve in which both mean and standard deviation values can be observed. Some of the values are rejected, which are known as reject limits. The accuracy of the curve depends upon the timer settings. Through this curve, testers can find the ideal values.

Measuring leak rate:

The next step involves measuring a leak rate. In this part, the rejected values (reject limits) are converted into leak rates by the medical device testers, and then a suitable leak rate is chosen. The volume under test is done on both the leaking instrument and the non-leaking instrument.

First, a known non-leaking part's decay value is integrated with a leaking instrument through which the leaking instrument can learn the decay value. After learning, it enters that into memory as zero sscm.

Then the volume under test is done on a non-leaking instrument with a known leaking part's decay value. Through this, testers can get an ideally calibrated point. Through leak rate, users can teach the instrument the new pressure decay values.

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