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Variable Rate FEP Permeation Model (TPV)

[Variable Rate FEP Permeation Model (TPV)]

Quote Request Options:

Can the customer refill a leak standard from a gas source regulated to less than 600psig.
(Affords possibility of a variable rate mode or open style): 
   Gas Inlet Fitting.
(Not required for leak standard models with gas reservoirs.): 
Gas Inlet Fitting
(If other, please specify): 
   Gas Outlet Fitting
(Not required for "Sniffer" Type applications. Specify leak detector manufacturer and model number under other.): 
Gas Outlet Fitting
(If other, please specify): 
   Gas Type: 
Gas Type
(If other, please specify): 
   Leak Rate: 
Leak Rate:     Test pressure & units : 
Test pressure & units
(if applicable): 
   Volumetric Flow Units: 
Which of the following best describes your intended application?: 
   Which of the following best describes your intended application?
(If other, please specify) : 

Variable Rate FEP Permeation Model (TPV)

The TPV model calibrated helium leak standard works equally well calibrating helium leak detectors that test under vacuum, and with helium leak detectors that sample from atmosphere utilizing a "sniffer probe". This was accomplished by designing the TPV model with both an integral KF25 (NW25) vacuum fitting and a pin-point helium source that accepts and aligns most manufacturers "sniffer probes" with virtually no "dead volume" where helium can accumulate and cause inconsistent readings. Calibrated helium leak standards with shut-off valves are designed to be used with hard vacuum systems and should not be used to calibrate a "Sniffer Type" leak detector. The FEP type leak element is not driven by differential pressure but helium partial pressure flows helium at virtually the same rate flowing into a vacuum or flowing.


  • Three point calibration with attached graph (Press. vs. leak rate)
  • Unbreakable FEP permeation type leak element
  • Not susceptible to plugging
  • The helium may be vented with the TPV model prior to shipping.
  • Refilling kit/pressure regulator is available to facilitate safe and easy refilling

Cincinnati Test Systems utilizes the finest grade of FEP available to manufacture their FEP leak elements. The leak elements have been tested at temperatures ranging from 10°C to 40°C yielding a temperature coefficient of approximately 2.5%/°C with no anomalous behavior.