Category: Control

  • Alicat isometrics drawing
    Control deadband tutorial

    Control deadband tutorial The dual valve PCD-Series maintains fast, precise closed system pressure control with minimal gas waste. This stable control is primarily due to a well-balanced PD2I algorithm. However, changing ambient conditions can still cause oscillation loops. Controller deadband creates a ± band of change around the chosen setpoint, minimizing oscillation loops in dual valve […]

  • Alicat isometrics drawing
    Control loop variable tutorial: Changing between mass flow, volumetric flow, or pressure control

    Control loop variable tutorial: Changing between mass flow, volumetric flow, or pressure control An Alicat mass flow controller is usually set up to control mass flow rate, but it can instead be set to control pressure or volumetric flow rate. See below for instructions on how to change the control variable. Video tutorial Step-by-step instructions […]

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    Setpoints/setpoint limits tutorial

    Setpoints/setpoint limits tutorial An Alicat can accept a setpoint from the front panel, a serial command, or an analog signal. All you have to do is make sure the Alicat knows where to look for the setpoint. Sometimes, you may want to limit the allowable setpoints to a specific range to avoid accidental tampering with […]

  • Alicat isometrics drawing
    Setpoint ramping tutorial

    Setpoint ramping tutorial Alicat controllers come equipped with a setpoint ramping feature that allows them to ramp up and/or down to changes in setpoint. With setpoint ramping, you can set a maximum speed at which a mass flow or pressure controller flows until the setpoint is achieved. Setpoint ramping can be performed using either the […]

  • Alicat isometrics drawing
    Batch function tutorial

    Batch function tutorial If you have a controller with the totalizer feature, you have the ability to set a batch fill. This allows you to set a specific total volume and a setpoint at the same time. Whether controlling flow or pressure, the device will hit the setpoint and automatically stop flow once the given […]

  • Alicat isometrics drawing
    PID tuning (PD/PDF/PD2I) tutorial

    PID tuning is a type of valve tuning that adjusts how the valve(s) on your Alicat flow or pressure controller responds to the setpoints that you command.