Blog

Category: Testing and leak checking applications

  • Testing a tube bore for imperfections

    When Alicat received an inquiry to test bore imperfections in 0.001 bore tubes, our engineers stepped up to the challenge.

  • Using pressure control to overcome the challenges of high-speed aerodynamic tests

    Overcoming the challenges of high-speed aerodynamic tests In aerospace development and testing, aerodynamicists frequently occasions need to pressurize large volumes to high pressures: often volumes of greater than 100 L, pressurized to over 150 PSIG. These aerodynamic tests generally require high flow rates in addition to high pressures. However, there can be limits on the […]

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    Mass flow controllers in SOFC applications

    SOFC fuel cell temperature control 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 fueled systems). SOFC stacks have the additional […]

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    Mixed gas re-metering

    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 mixed gas […]

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    Characterizing a filter with differential pressure

    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 pressure drop. As […]

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    High efficiency helium leak check using pressure control

    High efficiency helium leak check Using Alicat Instruments in High Efficiency Helium Leak Check via Helium Mass Spectrometer Leak Detection (HMSLD) 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 […]

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    Fast, accurate leak checking using one flow controller

    Fast, accurate leak checking using one flow controller Looking for a fast, accurate way to leak check your system? Whisper low pressure drop controllers provide a convenient, single instrument solution. A standard controller may also work, however stable leakages are best detected when the meter generates minimal pressure drop (line pressure due to frictional resistance). […]