Frequently Asked Questions
Q.
Why Helium?
A.

Helium is a non-flammable, colorless, odorless gas. Its concentration in the atmosphere is 5-50 ppm. Its small molecular size and ease of quantitative detectability make it an ideal medium for leak detection.

Q.
Why use a helium leak detector?
A.
Helium leak detection offers unparalleled sensitivity for finding leaks. It is quantitative, giving an accurate measurement of the rate of a leak, as opposed to the pass/fail results obtained with a dye penetration or vacuum bubble test.
Q.
How sensitive is it?
A.

Helium leak testers offer a sensitivity of 1 x 10-10cc/s.

Vacuum Bubble/
Dye Penetration
1 to .0001 cc/s
Pressure Decay
1 to 1x10-5 cc/s
Helium Leak Detection
1 to 1x10-10cc/s
Q.
How versatile is it?
A.
Helium leak testers cover the sensitivity ranges of other methods and up to a million times beyond.
Sensitivity
Std. cc/sec
Time for 1 cc
to leak
Bubble Time
In Water

 

1x10-1
10 seconds
1.3 seconds

 

1x10-2
100 seconds
13.3 seconds

 

1x10-3
16.7 minutes
14.5 minutes
Dye Penetration
Test
1x10-4
2.8 hours
24 minutes
Pressure Decay Test
1x10-5
27.8 hours
4 hours
Microbial Ingress Limit
1x10-6
11.6 days
> 1 day

 

1x10-7
3.9 months
--------

 

1x10-8
3.2 years
--------
Gas/Vapor
Protection
1x10-9
32 years
--------
Helium Leak Test
1x10-10
320 years
--------
Q.
Who uses helium leak detectors?
A.
Our clients include pharmaceutical companies such as Merck, Pfizer, Schering-Plough, Johnson & Johnson, and Novartis.
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