CALIBRATED LEAK STANDARDS FOR ALL GASES

CLO “Open-Style” Capillary Leaks

The CLO Model “OPEN-STYLE” (No Reservoir) CAPILLARYCALIBRATED LEAKS FOR ALL GASES
VTI’s CLO model calibrated gas leaks have a stainless steel
capillary that has been precision crimped to provide an
accurate flow-rate restriction for any gas. These “open-style”
or “in-line” leaks do not have a reservoir of gas but, instead,use an external gas source. Under pressure, gas flows
through the capillary restriction into the system or part being
tested. This yields a precise, known flow rate based on theinlet and outlet pressures.
The CLO leaks are available welded into a tube and welded
into many different inlet and outlet attachment fittings. Inaddition, these capillary leaks can be built into an actual or
simulated test part that can then periodically be put through aregular test cycle to validate and calibrate the entire leak test
system. This is the only way to be sure that the total test
procedure is finding the leaks that lead to product failure. A
separate brochure provides additional information.
These open-style leaks can be calibrated at one inlet pressure (your test pressure) to obtain a single specified
leak rate. Alternatively, they can be calibrated at several inlet pressures, usually three, to obtain different leakrates and the ability to vary the rate within a range (usually 10x) of values using the calibration curve ofpressure vs. leak rate provided.

Choosing the CLO Calibrator
CAN BE CALIBRATED WITH ANY GAS: or mix.
UNBREAKABLE: all stainless steel, all welded.
WIDE LEAK-RATE CHOICE: can be used for large
leak rate applications.
SINGLE OR ADJUSTABLE LEAK RATES: can becalibrated or one or multiple pressures/rates.
STABLE: low temperature coefficient of 0.2% per oC.
CAN BE BUILT INTO A PRODUCTION TEST PART: tosimulate a defect with a specific leak rate.
BAKEABLE FOR UHV USE: using all metal fittings.
MEETS ISO REQUIREMENTS: NIST-traceable, A2LAaccredited Calibration Certification.

VTI’s Calibration
Laboratory is Accreditedby the American
Association forLaboratory Accreditation.

Typical CLO assembly. This example part would
have the part number:
CLO-X-3C-HE-4FVCR-4MVCR(X= Leak Rate Range)
As the major manufacturer of Calibrated Leaks for
all gases, all leak rates, and all makes of leakdetectors, VTI supplies them worldwide to users,
distributors, and other manufacturers. These AccuFlow™
LeakStandards
arerecognizedinternationally for their superior quality construction
and calibration.

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

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

CALIBRATED LEAK STANDARDS FOR ALL GASES

CLO “Open-Style” Capillary Leaks
ORDERING INFORMATION
For an order or quotation for a CLO Leak, please provide the Part Number, confirm the Inlet Fitting for connection to yourgas source line, and confirm the Outlet Fitting for connection to the test system or part. It is also necessary to specify
the Gas, the Inlet Pressure from your gas line, and the Outlet Pressure (usually vacuum or 1 atmosphere), all as used inyour test and to be used for the calibration. Any dimensional requirements should also be noted.
In addition, for CLO’s to be used at one Leak Rate, please state the specific Leak Rate requested (at the specified Inletand Outlet Pressure) and your preferred leak-rate units. Also, the Manufacturing Variance (“Tolerance”) that you canallow on that Leak Rate should be specified as +/- 40% (the normal allowance), or as +/- 15% (the “Special-RangeVariance”), for which there is an additional cost and an “-SR” added to the part number. An example specification is
2.0x10-5 atm-cc/sec +/- 40%. In all cases, the leak rate provided will be as close as we can make it to your specified rate,
and the actual rate, as calibrated, will be recorded on the Calibration Tag and the Certifications.
CLO Leaks can also be calibrated at multiple pressures to provide a range of adjustable leak rates, for example covering-5values from 1 to 9x10 atm-cc/sec using three pressures from 15 to 200 psig. VTI provides a curve of Leak Rate vs.
Pressure based on the calibrations. This allows the leak rate to be changed by changing the inlet pressure and allows
exact leak rates to be selected without the limitation of the
manufacturing variance. For these adjustable-rate CLO’s,PART NUMBER BUILD-UP
the Leak Rate Range requested and your available Inlet
Pressure Range, as well as your Outlet Pressure, should
The CLO Part Numbers are constructed as follows:
also be specified. VTI can advise on the leak-rate range
CLO-X-NA-BB-YYYY-ZZZZ
achievable based on your available pressure range.
where X = the code for the Leak Rate Range required.
where N = the code for the number of calibration points.
EXAMPLE FITTINGS AVAILABLE
Where A = calibration method (C for He, P for other gases)
Please contact us for other fitting requirements.
where BB = the code for the Gas to be used,where YYYY = the code for the INLET fitting required,
Code:
Description:and ZZZZ = the code for the OUTLET fitting required.
4FVCR¼” Female VCR
4MVCR¼” Male VCR
MCFF
1.33” OD Mini Conflat Flange
EXAMPLE GASES AVAILABLE
2CFF
2.75” OD Conflat Flange
1/4T¼” OD Tube
Please contact us with other gas requirements.
KF16¾” OD ISO Flange
Helium (HE), Argon (AR), Nitrogen (N2), Hydrogen (H2),KF25
1” OD ISO FlangeCarbon Dioxide (CO2), Oxygen (O2), Air (AIR), Methane
KF40
1.5” OD ISO Flange(CH4), Sulphur Hexafluoride (SF6), Refrigerants (“R”#),
4MPT¼” Male Normal Pipe Thread
Xenon (XE), Deuterium (D2), Mixed gases (MIX).

LEAK RATE RANGES AVAILABLE and EXAMPLE PART NUMBERS
Leak Rate Ranges
Available for the CLO
Specify a value in the range
for 1 cal point or range to becovered by 3 cal points.

1.0 to 9.9x10-1 atm-cc/sec
1.0 to 9.9x10-2 atm-cc/sec
1.0 to 9.9x10-3 atm-cc/sec
1.0 to 9.9x10-4 atm-cc/sec
1.0 to 9.9x10-5 atm-cc/sec
5x10-5 to 5x10-6 atm-cc/sec
1.0 to 9.9x10-6 atm-cc/sec

Leak
Range
Code(X)
1234
5
5/66

Cal P’ts& Type
Code(NA)
1C
1P
3P
1P
1P
3P
3C

Gas
CodeOutlet
FittingCode(ZZZZ)Example Part
Number(BB)Inlet
FittingCode(YYYY)HE
AR
SF6AIR
XE
H2HE

4FVCR
4MVCR
KF25
4FVCR
MCFF
1/4T
4MPT

4MVCR
MCFF
KF40
4MVCR
2CFF
2CFF
4MPT

CLO-1-1C-HE-4FVCR-4MVCR
CLO-2-1P-AR-4MVCR-MCFF
CLO-3-3P-SF6-KF25-KF40
CLO-5-1P-AIR-4FVCR-4MVCR
CLO-5-1P-XE-MCFF-2CFF
CLO-5/6-3P-H2-1/4T-2CFF
CLO-6-3C-HE-4MPT-4MPT

Note: Larger and smaller flow rates are possible. However, with leaks smaller than 10-6 atm-cc/sec plugging of thecapillary is possible unless a source of pure gas is provided.

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

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

CLO-DATA-09/2004-Rev1