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Tag: tutorial

  • Alarm function (ALE command) tutorial

    Alarm function (ALE command) tutorial Alicat flow and pressure devices have an optional alarm functionality that helps simplify control systems such as PLCs or manned stations. An alarm is transmitted as an analog signal though the communications connector on the device. In systems where an Alicat is not connected to a central system, the alarm […]

  • 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 […]

  • 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 […]

  • Totalizer tutorial

    Totalizer tutorial While a meter measures the rate of flow at any given moment, a mass flow totalizer measures the total accumulated mass of a particular gas (or gas mixture) that has been flowed in a process. The totalizer function can also be used with a mass flow controller to dispense batches of set amounts […]

  • Gas Select™ and Composer™ tutorial

    Gas Select™ and Composer™ tutorial Alicat mass flow devices come preloaded with 98-130 gases that are selectable using Gas Select™. Composer™ firmware additionally allows the user to create and store up to 20 custom gas mixes. See below for instructions how to use Gas Select™ and Composer™. Video tutorial Step-by-step instructions Gas Select™ (front panel) […]

  • Zero band (deadband) tutorial

    Zero band (deadband) tutorial Alicat mass flow devices measure flow using differential pressure, making them very sensitive. Because of this, factors such as the air conditioning in the room may lead to small fluctuations in device readings. If you notice that your device is fluctuating around very low flow rates, you can use the zero […]

  • Changing engineering units tutorial

    Changing engineering units tutorial You can easily change the engineering units displayed on your Alicat device and/or in the serial data. You can even have the display use a different set of engineering units from the serial data. For your convenience, each device comes pre-loaded with all relevant engineering units. See below for instructions on […]

  • Flow and pressure averaging tutorial

    Flow and pressure averaging tutorial Most Alicat devices have sensor response times <1 ms, making measurements susceptible to noise. This tutorial details how to change flow and pressure averaging to average out noise in readings. Video tutorial Step-by-step instructions (front panel) Pressure averaging Press the bottom right button for “MENU” selection. Press the bottom middle […]

  • Inverse pressure control tutorial: Switching from forward to back pressure control

    Inverse pressure control tutorial: Switching from forward to back pressure control A forward pressure controller can be reconfigured into a back pressure controller by following two simple steps. First, you must swap the valve location (tutorials linked below). You can then activate inverse pressure control using either the front display or serial communications. In this […]

  • Taring/auto-taring tutorial

    Taring/auto-taring tutorial Setting the tare takes a sensor signal and sets it as zero in flow or pressure. A zero setpoint results in closing of the valve (on controllers) and creates a known “no flow” condition. Many measurement devices need to periodically have tare set to remove errors due to drift. Improperly setting tare (when […]