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Category: Process control

  • Achieving more repeatable coatings with faster, more precise pressure control

    Achieving more repeatable coatings with faster, more precise pressure control Issue: Uneven coating quality and poor repeatability, resulting from fluctuations in vacuum chamber pressure.  Cause and Context In the rarefied atmospheres of vacuum coating systems, pressure fluctuations arise—and small changes count for a lot. From the interaction of control components and asynchronous operation of those […]

  • TIG (Tungsten Inert Gas) Welding

    App Note:TIG (Tungsten Inert Gas) Welding In the TIG (tungsten inert gas) welding process, a tungsten electrode is used to provide an electric arc forwelding. A sheath of inert gas surrounds the electrode, the arc and the area to be welded. This gas shielding process prevents any oxidization of the weld and allows for the […]

  • Reliable Air Delivery for Automated Liquid Paint Application

    App Note: Reliable Air Delivery for Automated Liquid Paint Application Robotic painting, one of the sectors within the Coatings Industry, has several applications in which mass flow is critical to paint application and control. In a typical application, paint is dispensed at the end of a robotic painting arm that articulates close to the surface, […]

  • External Ion Gauge Vacuum Control System

    App Note: External Ion Gauge Vacuum Control System Research projects involving isolated chambers with decomposing organic components often use rotometers. The external ion gauge vacuum control system uses a special configuration of the Alicat single valve pressure controller. Alicat’s External Ion Gauge Vacuum Controller was designed specifically for the vacuum coating industry. This innovation circumvents […]

  • Product Sparging

    App Note: Product Sparging Sparging is a process where a gas is injected into a liquid to achieve a variety of results. The sparging bar has many fine holes through which the gas is transferred into the product in the sparging tank. Maintaining a constant flow rate is crucial in order to obtain the desired […]

  • Gas Mixing Systems

    App Note: Gas Mixing Systems Some industries require custom gas mixes for the proper operation of their production processes including: Welding gases Furnace atmospheres Vacuum process control Sensor calibration This requirement is often filled by purchasing pre-mixed gases from a compressed gas supplier. An alternate method of satisfying this need is to create the required […]

  • Pressure and Flow Control for Gas Analysis

    App Note: Pressure and Flow Control for Gas Analysis Some Analytical Processes Are Best Standardized At A Fixed Gauge Pressure. An Alicat PC-30PSIG Pressure Controller is used to set the pressure in the analytical device. The outflow from the device is controlled by an Alicat MC-200SCCM-D Mass Flow Controller. Other Analytical Processes Are Best Standardized […]

  • 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 […]

  • Controlling pH with CO2 Injection

    App Note: Controlling pH with CO2 Injection A customer approached Alicat with a water treatment application in which CO2 would be sparged into a body of water in order to control the pH level of the water. The application involved the need to control mass flow over a wide flow range, while at the same time reducing […]

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