HELIUM CALIBRATED LEAK STANDARDSVSLC Sniffer-Detector Calibrators

The VSLC Model CALIBRATORS FOR SNIFFER-TYPE HELIUM
LEAK DETECTORS (also available for other gases and mixtures)
The VSLC Leak Standards have been developed
specifically to calibrate sniffer leak detectors. The
VSLC model is manufactured with a capillary leakelement that provides good service in mostenvironments in the usual range for “Sniffing” of 10-3 to10-6 atm-cc/sec. It should be noted, however, that thecapillary is susceptible to clogging in dirty
environments and at very small leak rates. With thecapillary leak element, the VSLC Calibrators can beused for the larger leak rates of 10-3 and higher, andthey have a very low temperature coefficient of 0.2% peroC, which is convenient for applications with wide
temperature variations.
Primarily developed originally for calibrating Helium
sniffer-type leak detectors, this model is used also tomake Calibrators of many other gases and gas mixtures
such as hydrogen or helium in nitrogen.

Choosing the VSLC Calibrator
UNBREAKABLE – stainless steel capillary leak element.
LOW TEMPERATURE COEFFICIENT – flow rate does notchange with temperature.
ADJUSTABLE LEAK RATE – each has a 10:1 leak-raterange.
CAN BE SET TO AN EXACT LEAK RATE – without theusual manufacturing variance.
REFILLABLE RESERVOIR – from the user’s gas supply.
NO FALSE READINGS – no large dead spaces.
EASY PROBE POSITIONING – for repeatable results.
SUITABLE FOR OTHER GASES and GAS MIXTURES –contact the factory with your requirements.
MEETS ISO REQUIREMENTS - NIST-traceable, A2LAaccredited Calibration Certification.

VTI’s Calibration
Laboratory is Accreditedby the AmericanAssociation forLaboratory Accreditation.

VSLC Calibrator
Model VSLC-X-3C-HE
As the major manufacturer of Calibrated Leaks for allgases, all leak rates, and all makes of leak detectors, VTI
supplies them worldwide to users, distributors, and othermanufacturers.
These Accu-Flow™ Leak Standards are recognizedinternationally for their superior quality construction andcalibration.

VACUUM TECHNOLOGY INCORPORATED Oak Ridge, Tennessee USA
Toll-Free: 800-704-4774

Fax: 865-481-3788
sales@vacuumtechnology.com
www.vacuumtechnology.com

HELIUM CALIBRATED LEAK STANDARDSVSLC Sniffer-Detector Calibrators
ORDERING INFORMATIONThe VSLC Calibrators can be ordered for various adjustable leak-rate ranges commonly used for sniffer-type leakdetection. When ordering or requesting a quotation, please provide the Part Number and also specify the Approximate
Leak-Rate Range requested including your preferred leak-rate Units (for example, “approximately 1 to 9x10-5 atmcc/sec”). The Range specification is “approximate” because the minimum and the maximum value of the range will varyslightly for individual leaks due to the Manufacturing Variance. The leak-rate range available for each VSLC Leak isapproximately a factor of 10, so the leak-rate range should be requested as approximately 1 to 9x10-x atm-cc/sec.
A leak-rate range extending between two decades can also be requested, such as from 5x10-6 up to 5x10-5 atm-cc/sec.
(This is also an appropriate way to order a VSLC if you want to be able to obtain an exact leak rate of 1.0 x 10-5 atm-5
cc/sec.) An alternative specification is to identify the “Central Leak Rate” for a VSLC Leak, such as 5 x 10 atm-cc/sec,
and VTI will build the Leak to provide that leak-rate at a mid range pressure on the 400-psig gauge. Using additional
calibrations at a lower and higher pressure, the total leak-rate range of the Leak then extends above and below thiscentral value. For each VSLC Calibrator, it is noted that exact leak rates like 4.5 x 10-5 can be obtained within its
available range.
The VSLC Model Calibrators always have a fill/exhaust valve to allow the users to exhaust gas from its 110 cc reservoir
to lower the leak rate, or to refill the reservoir to a higher pressure (using their clean gas supply) to increase the leakrate. The 400-psig pressure gauge on the standard VSLC model is used in VTI’s NIST-traceable Leak-rate Calibrations
and preserves the NIST-traceability of the calibration for the user as the pressure and leak rate are varied.
Various leak-rate units can be specified and the calibration data will then be reported in the units requested. Pleasecontact us for assistance if you have any questions or want a customized VSLC Leak.

“Special Orders” are everyday products for us ! Just let us know what you need !

PART NUMBER BUILD-UP
The Part Numbers for the VSLC Helium Sniffer
Calibrators are constructed as follows:
VSLC-X-3C-HE

The Part Numbers for VSLC Sniffer Calibrators for gases
other than Helium are constructed as follows:
VSLC-X-3P-AA

where X = the code for the Leak Rate “Decade”
of the adjustable leak-rate range requested,
where 3C designates three calibration points,
and HE designates the gas used as Helium

where X = the code for the Leak Rate Range “Decade”,
where 3P designates three calibration points,
and AA is the code for the gas used.

The X codes are listed below. As noted above, theactual range of leak-rates requested within that decadeshould also be specified.

The Code for any mixed gas, such as helium-nitrogen is always:MIX. (Specify the composition.) Other common gases and theirCodes are: Argon (AR), and Sulfur Hexafluoride (SF6). Please
consult our Technical Staff for other Gases and their Codes.

LEAK-RATE RANGES AND PART NUMBERS FOR VSLC MODEL LEAKS
Examples of Requested Leak-Rate Ranges

Leak-Rate Code (X)Correct Part Number

1 to 9x10-3 atm-cc/sec
1 to 9x10-4 atm-cc/sec
5x10-4 to 5x10-5 atm-cc/sec
1 to 9x10-5 atm-cc/sec
3x10-5 to 3x10-6 atm-cc/sec
1 to 9x10-6 atm-cc/sec

344/5
55/6
6

VSLC-3-3C-HE
VSLC-4-3C-HE
VSLC-4/5-3C-HE
VSLC-5-3C-HE
VSLC-5/6-3C-HE
VSLC-6-3C-HE

1 to 9x10-6 atm-cc/sec (for Argon)

6

VSLC-6-3P-AR

VACUUM TECHNOLOGY INCORPORATED Oak Ridge, Tennessee USA
Toll-Free: 800-704-4774

Fax: 865-481-3788
sales@vacuumtechnology.com
www.vacuumtechnology.com
VSLC-DATA-09/2004-Rev1