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Category: Testing and leak checking

  • SOFC Fuel Cell Temperature Control

    App Note: SOFC Fuel Cell Temperature Control Alicat Controllers in SOFC Applications Traditional fuel cell stacks are dependent upon mass flow control devices to regulate the flow of fuel gas into the reformer (in the case of hydrocarbon fueled systems) or hydrogen and air or oxygen directly into the stack (in the case of hydrogen […]

  • Testing a Tube Bore for Imperfections

    App Note: Testing A Tube Bore For Imperfections The engineers at ACME Small Bore are up to it again. This time they are testing bore imperfections in .001 bore tube. How small is that? Really, really small. He will pass a ported-hollow rod between two o-rings using a highly accurate, precision motor. This rod pressurizes […]

  • Mixed Gas Re-Metering

    App Note: Mixed Gas Re-Metering Some production processes gain substantial quality and yield improvements through mixed gas re-metering. Historically, there have been few technologies that can support mixed gas re-metering, particularly in flows below 20SLPM or operating at low pressures. One solution uses Alicat’s mass flow meters in combination with the Wilke Semi-empirical method for […]

  • Filter Characterization with Differential Pressure

    App Note: Filter Characterization with Differential Pressure   An Alicat Differential Pressure Controller is used to characterize a filter’s flow vs. a pressure drop curve. The PC-15PSID-D pressure controller is used to set the pressure drop across the filter. The M-10SLPM-D mass flow meter is used to measure the flow rate required to generate that […]

  • High-Speed Aerodynamic Test

    App Note: High-Speed Aerodynamic Test An engineer at ACME Airplane Behemoth Co. was in a quandary. He needed a device to control high pressure (>500 PSI) in a high-speed aerodynamic test he was setting up. For this test he needed to pre-charge a chamber to high pressure. Then, via a rupture disk, he would quickly […]

  • High Efficiency Helium Leak Check

    App Note: High Efficiency Helium Leak Check High Efficiency Helium Leak Check The interior of a test article is connected to a mass spectrometer leak test apparatus. This is placed in a chamber. The chamber is evacuated through a connection to an Alicat PCD-30PSIA-D Dual Valve Absolute Pressure Controller. The chamber is then refilled to […]

  • Even Faster (and Simpler) Leak Checking

    App Note: Even Faster (and Simpler) Leak Checking Fast and accurate leak checking can be a complicated process requiring a rather complex setup. When the Device Under Test (DUT) is subjected to a constant pressure within a closed system, any resulting flow is a direct measure of the DUT’s leakage. This test requires both stable […]

  • Faster Leak Checking

    App Note: Faster Leak Checking Many processes require a fast, accurate and reliable method for leak checking components. This can be accomplished by utilizing an Alicat Scientific M Series mass flow meter sized appropriately for the expected leak rate and an Alicat Scientific PC3 Series remote sensing pressure controller sized for the required pressure. Alicat […]

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