where expertise comes together - since 1996 -

The Largest Open Access Portal of Nondestructive Testing (NDT)

Conference Proceedings, Articles, News, Exhibition, Forum, Network and more

where expertise comes together
- since 1996 -
6278 views
Technical Discussions
Angelo Negri
Angelo Negri
00:01 Mar-10-2003
Helium leaks measurement: ppm or mbar*l/s?

In order to perform valves Fugitive Emissions tests, we use a VARIAN sniffer probe helium leak detector, which gives readings in mbar*l/s. Our usual European reference specification (Shell MESC SPE 77/312) also gives limits in the same measurement unit.
First of all, is anybody able to explain the physical meaning of "mbar*l/s"? Is that a flow rate or a concentration?
Then, how is it possible to relate this with "ppm]"? As many leak detectors manufacturers have instruments with both scales, we think there must be a simple relation between the two units.
Many thanks in advance, 'NGL


 
 Reply 
 
Johnny Darbonne
Johnny Darbonne
00:54 Apr-22-2005
Re: Helium leaks measurement: ppm or mbar*l/s?
: In order to perform valves Fugitive Emissions tests, we use a VARIAN sniffer probe helium leak detector, which gives readings in mbar*l/s. Our usual European reference specification (Shell MESC SPE 77/312) also gives limits in the same measurement unit.
: First of all, is anybody able to explain the physical meaning of "mbar*l/s"? Is that a flow rate or a concentration?
: Then, how is it possible to relate this with "ppm]"? As many leak detectors manufacturers have instruments with both scales, we think there must be a simple relation between the two units.
: Many thanks in advance, 'NGL
.
mbar*l/s is a flow rate of helium into the mass spectrometer. If you know the flow rate on your sniffer probe(measured using a precision flow measuring device) then you can convert your reading to ppm. 1 ppm = 1X10-6 of total flow. i.e. Your probe has a flow rate of 1-mbar-liter/sec and your mass spectrometer reads 5X10-6 mbar-liters/sec helium then the ppm value is 5 ppm helium.


 
 Reply 
 

Product Spotlight

UCI Hardness Tester NOVOTEST T-U2

UCI hardness tester NOVOTEST T-U2 is is used for non-destructive hardness testing of: metals and
...
alloys by scales of hardness: Rockwell (HRC), Brinell (HB), Vickers (HV); non-ferrous metals, alloys of iron etc., and using five additional scales for calibration; with tensile strength (Rm) scale determines the tensile strength of carbon steel pearlitic products by automatic recalculation from Brinell (HB) hardness scale.
>

MIZ®-21C: Truly Affordable Eddy Current Handheld with Surface Array Capability

Introducing MIZ-21C, the first truly affordable handheld eddy current instrument with surface array
...
capabilities. MIZ-21C can deliver fast, accurate inspections in demanding NDT applications including aerospace, oil and gas, manufacturing, and power generation. The surface array solution can reduce inspection time by up to 95% compared to traditional handheld pencil probes. The ergonomic design, long battery life, and intuitive touchscreen mean you can inspect more areas faster than ever without fatigue.
>

YXLON Cougar EVO

Scalable small footprint X-ray inspection systems for assembly and laboratory applications. The
...
YXLON Cougar EVO series was designed to provide the "best-in- class" inspection solutions for SMT, semiconductor, and laboratory assembly applications, while maintaining a small system footprint for maximum convenience. With optimized software and hardware, these systems produce higher quality and more consistent results than other electronics inspection systems currently on the market.
>

Navic - Steerable Modular Automated Scanner

The Navic is a modular, motorized, steerable scanner designed to carry multiple attachments used
...
in various scanning and inspection applications. The Navic is capable of weld scanning (girth welds and long seam welds), automated corrosion mapping, and tank scanning.
>

Share...
We use technical and analytics cookies to ensure that we will give you the best experience of our website - More Info
Accept
top
this is debug window