The leak flow measurement is based on the Mass Conservation Law, where the IGLS measures, unlike other traditional methods, the flow rate of make up air added to the unit under test (UUT). The incoming flow rate, at steady state condition, is equal to the amount of mass being leaked.

Select a tab below to learn more about ATC's technologies and how they work.

ATC's Micro-Flow Technology

What It Does

Micro-Flow measures the "make up flow" to hold constant pressure. This translates to the leak flow rate.

The Intelligent Gas Leak Sensor (IGLS) operates in the viscous and slip flow regimes:

  • Sensors with a full scale as low as 0.025 cc/min (~4×10-4 cc/sec.)
  • Measures Volume Flow, Pressure and Temperature
  • Any Momentum loss will cause electrical signal loss proportional to the vlow volume (cc/min)

Why It's Better

  • Faster leak test
  • Stable measurement, environmentally (temperature) insensitive
  • Sensitivity - Replaces helium with air testing
  • No Vacuum Required
  • Easy to operate
  • Simple Equipment Setup
  • Direct Measurement - Does Not Require Frequent Calibration
  • Measurement is NOT sensitive to part volume
  • Can test multiple parts with one instrument (Requires Sorting Option)

Pressure Testing

ATC's Mass Extraction Technology

What it Does

ATC's patented Micro-Flow Technology is a revolutionary alternative to other leak detection methods. It measures the amount of air extracted from a sealed part/enclosure, which is proportional to its defect size. ATC's IGLS micro-flow sensor is more sensitive due to gas expansion at specific vacuum conditions. ATC offers two operational regimes:

  • IGLS Sensor - Operates in slip/viscous flow and vacuum from 2 psia to barometric condition (detection of defects from 1 micron)
  • IMFS Sensor - Operates in both transitional and molecular flow regimes (air flow from 6×10-7 sccs) detects from 0.1 micron

ATC products can measure air that has been extracted from your part in one of the following configurations:

  • A sealed part inside a vacuum chamber.
  • A pressurized part inside a vacuum chamber.
  • Vacuum pulled from inside the part (No chamber required).
  • Vacuum pulled from inside the part with the part exposed to outside pressure.

Why It's Better

  • Nondestructive
  • Shorter Cycle Times
  • Direct Measurement of Leak Flow
  • Operates in Helium Mass Spectrometry Range
  • No Tracer Gasses Required
  • Insignificant Temperature Sensitivity
  • Does NOT Require Hard Vacuum for Most Applications
  • Reduces Maintenance and Operation Cost. 

Vacuum Testing

Sharp Edge Orifice and Equivalent Diameter (ED)

Sharp Edge (SE) orifices known also as equivalent diameters have length/diameter (L/D) ratios significantly lower than equivalent channels. The orifices are encapsulated in a stainless steel housing. These products are assembled using advanced micro-fabrication technologies.

Product Usage

Geometric definition of leak tightness – Simple and Unambiguous Specification. Independent of test type, location, temperature, pressure and test fluid!

Each orifice is supplied with:

  • A filter
  • A calibration certificate, NIST traceable
  • ¼” Swagelok female connection

Independent pressure tank is required for stand alone orifices, with controlled pressure range.

Notes:

  • Leak flow is measured in actual cc/min or mm3 /min. Pressure is measured in absolute pressure (psia). Both are measured upstream (inlet) of the orifice.
  • Flow rate and orifice size are for reference only. Actual value may change from orifice to orifice.
  • The enclosed data shall not be used for vacuum applications.
    Consult ATC, ME2 Specifications for vacuum applications.

Equivalent Channel (EC)

The Equivalent Channel is a geometric definition of leak tightness. This simple and clear specification is the basis of multiple automotive standards such as the FORD Fuel specification and SAE Standards as well as other industry standards.

Product Usage

From many years of experience, our engineers have found that geometric definition is the most reliable way to define your product’s leak test integrity requirements.

Equivalent channels meet the requirements of US-CAR, SAE J2045, SAE J2587, & SAE J2973 for US-CARB LEV II + PZEV, EURO-5 Hydrocarbon Emission Standards and Major OEM Leak Tightness Specifications. The Equivalent Channel should be used as your CALIBRATED LEAK due to its unique flow response properties.

  • Equivalent Channel Standard (ECS)
  • Equivalent Channel Device (ECD)

These products are available and are assembled using advanced micro-fabrication technologies. The ECD/ECS are constructed from Silica (glass) and encapsulated in stainless steel housing. Our unique manufacturing process ensures a uniform and smooth bore.

Notes:

  • Leak flow is measured in actual cc/min, pressure in absolute pressure psia. Both are measured upstream (inlet) to the orifice.
  • Flow rate and EC sizes are used for reference only. Actual value may change from EC to EC.
  • The enclosed data is not applicable to vacuum applications.

ATC's Micro-Flow Technology

What It Does

Basically measures the “make up flow” to hold constant pressure and this is the leak flow rate.

The Intelligent Gas Leak Sensor (IGLS) operates in the viscous and slip flow regimes

  • Sensors with full scale as low as 0.025 cc/mm (~4×10-4 cc/sec.)
  • Measures volume flow, P, T
  • Momentum loss causes electrical signal, proportional to volume flow (cc/min)

Why It's Better

  • Faster leak test compared to pressure decay for same capability.
  • Stable measurement, environmental (temperature) insensitive compared to pressure decay or mass flow.
  • Sensitivity – Replaces helium with air test.
  • No vacuum.
  • Simpler to operate.
  • Less equipment & operation expense than helium testing.
  • Direct measurement – does not require frequent calibration.
  • Measurement is not part volume sensitive.
  • Multiple parts tested with one instrument & sort option.

ATC's Mass Extraction Technology

What it Does

ATC’s patented Micro-Flow Technology is a revolutionary alternative to other leak detection methods.  It measures the amount of air extracted from a sealed part/closure, which is proportional to its defect size. ATC’s IGLS micro-flow sensor is more sensitive due to gas expansion at vacuum conditions. ATC offers two operational regimes:

  • IGLS sensor operates in slip/viscous flow and vacuum from 2 psia to barometric condition (detection of defects from 1 micron).
  • IMFS sensor, operates in transitional and molecular flow regimes (air flow from 6×10-7 sccs) detects from 0.1 micron.

ATC instruments can measure air extracted from your part in one of the following configurations:

  • Sealed part, inside a vacuum chamber.
  • Pressurized part, inside a vacuum chamber.
  • Vacuum pulled from inside the part, part not in a chamber.
  • Vacuum pulled from inside the part, part exposed to pressure on outside.

Why It's Better

  • Nondestructive.
  • Shorter cycle time.
  • Direct measurement of leak flow.
  • Operates in helium mass spectrometry ranges.
  • No tracer gases.
  • Insignificant temperature sensitivity.
  • Does not require hard vacuum for most applications.
  • Reduces your maintenance and operation cost.

Sharp Edge Orifice and Equivalent Diameter (ED)

Sharp Edge (SE) orifices known also as equivalent diameters have length/diameter (L/D) ratios significantly lower than equivalent channels. The orifices are encapsulated in a stainless steel housing. These products are assembled using advanced micro-fabrication technologies.

Product Usage

Geometric definition of leak tightness – Simple and Unambiguous Specification. Independent of test type, location, temperature, pressure and test fluid!

Each orifice is supplied with:

  • A filter
  • A calibration certificate, NIST traceable
  • ¼” Swagelok female connection

Independent pressure tank is required for stand alone orifices, with controlled pressure range.

Notes:

  • Leak flow is measured in actual cc/min or mm3 /min. Pressure is measured in absolute pressure (psia). Both are measured upstream (inlet) of the orifice.
  • Flow rate and orifice size are for reference only. Actual value may change from orifice to orifice.
  • The enclosed data shall not be used for vacuum applications.
    Consult ATC, ME2 Specifications for vacuum applications.

Equivalent Channel (EC)

The Equivalent Channel is a geometric definition of leak tightness. This simple and clear specification is the basis of multiple automotive standards such as the FORD Fuel specification and SAE Standards as well as other industry standards.

Product Usage

From many years of experience, our engineers have found that geometric definition is the most reliable way to define your product’s leak test integrity requirements.

Equivalent channels meet the requirements of US-CAR, SAE J2045, SAE J2587, & SAE J2973 for US-CARB LEV II + PZEV, EURO-5 Hydrocarbon Emission Standards and Major OEM Leak Tightness Specifications. The Equivalent Channel should be used as your CALIBRATED LEAK due to its unique flow response properties.

  • Equivalent Channel Standard (ECS)
  • Equivalent Channel Device (ECD)

These products are available and are assembled using advanced micro-fabrication technologies. The ECD/ECS are constructed from Silica (glass) and encapsulated in stainless steel housing. Our unique manufacturing process ensures a uniform and smooth bore.

Notes:

  • Leak flow is measured in actual cc/min, pressure in absolute pressure psia. Both are measured upstream (inlet) to the orifice.
  • Flow rate and EC sizes are used for reference only. Actual value may change from EC to EC.
  • The enclosed data is not applicable to vacuum applications.

About ATC

Innovative Leak Testing Using Advanced Micro-Flow Technology Since 1995

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