Set the Detection Time and Calculate the Leak Specifications
Calculate and set the differential pressure and Detection time (T) according to the leak Q using the Equivalent Internal Volume Ve.
Generally, a Detection time of 2 to 10 seconds and a differential pressure ΔP in the range of ±10 to 100 Pa are appropriate.
Q: Leak (mL/min) Ve: Equivalent Internal Volume (mL) ΔP: Differential pressure (Pa) T: Detection time (s)
If you use a leak tester with direct-reading display, it is unnecessary to set the differential pressure.
Guide to Calculating Pressurization and Stabilization Times
For Intelligent 1 Pneumatic Circuit
Pressurization time (CHG) : Stabilization time (BAL) = 3:1 or 4:1
For Intelligent 2 Pneumatic Circuit
Pressurization time (CHG) : Equalization (BAL1) : Stabilization (BAL2) = 5:5:1
【Note】
When the work volume is small, Equalization time is not necessary; set BAL1 = 0 sec.
These times usually depend on the actual condition of the machine and fixture and the characteristics of the work, and should be determined through experimentation.
For works that have been used in the past, they can also be estimated.
Required pressurization and stabilization time
(Pressurization time CHG + Stabilization time BAL)
* Detection time is not included in the above figure.
* Time varies depending on the required accuracy.
【Note】
Before setting the measurement time in experiment or adjustment, ensure that there are no leaks in the work and fixture. Then, first, take a long enough Pressurization time to collect data.
Gradually shorten this time to find the shortest pressurization and stabilization time where the data is stable near zero.