Blog

Tag: tutorial

  • How to set control deadband

    Setting control deadband Control stability in closed volume systems is essential in many applications including cell research and fuel cell testing. Managing oscillation loops in dual valve systems is a critical part of enabling precision control of these systems.  This led us to develop our controller deadband functionality. Balancing the operation of an inlet valve […]

  • How to change the control loop variable

    Changing the control loop variable: mass flow, volumetric flow, or pressure control An Alicat mass flow controller is usually set up to control mass flow, but it can instead be set to control volumetric flow or pressure.  Similarly, Alicat’s liquid flow meters can control either volumetric flow rate (default) or gauge pressure.  Simply change a […]

  • How to select PID tuning terms and algorithms

    Setting the control loop type and gains Alicat controllers come equipped with two different tuning algorithms: PDF and PD²I tuning.  Every controller is custom tuned at the factory for your application, or given generic terms when the application is unknown.  If your device isn’t controlling as expected, perhaps ringing around the setpoint or taking a […]

  • How to use the gas totalizer on a mass flow controller

    Using the gas totalizer on a mass flow controller Mass flow totalizing is used for measuring how much accumulated mass of a particular gas (or gas mixture) has been flowed in a process, where a meter alone will measure the rate of flow at any given moment. Alicat mass flow meters have a totalizer function […]

  • How to use Gas Select and Composer

    Using Gas Select and Composer Alicat mass flow devices come with at least 98 selectable gases.  The Composer software is included on all mass flow devices and allows the user to create up to 10 different custom gas mixes. See below for instructions how to use gas select and Composer or learn more about Composer […]

  • How to adjust zero band (AKA deadband)

    Adjusting zero band (AKA deadband) Because Alicat measures flow using differential pressure, the readings are very sensitive.  Our Whisper Series can even measure the air conditioning in the room.  Sometimes all that noise, is just noise, and it’s helpful to add a zero band to the display.  This will display very small flow readings as […]

  • How to change engineering units

    Changing engineering units on an Alicat For ease of use, you can change the engineering units displayed on your Alicat or used in the serial data in the field.  You can even have the display using a different set of engineering units from the serial data. Devices will have all engineering units relevant to its […]

  • How to change flow and pressure averaging

    Changing flow and pressure averaging Alicat devices are incredibly fast.  Most devices take just 4 ms to register a change in process, and every device updates readings each ms.  For applications where noise is present, it can be helpful to average out this noise on the front screen for ease-of-reading.  This averaging will also affect […]

  • How to switch from forward to back control

    Switching from forward to back control Sometimes applications will require control of the process ‘upstream’ of the Alicat instrument (a traditional back-pressure control situation, for example). For these cases, the valve needs to be in the downstream position.  Just make sure to let us know when you order, and we’ll take care of the rest.  […]

  • How to tare your Alicat device

    Taring your Alicat device What is tare? Why is it important? And how do I tare? 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, not meters) and creates a known “no flow” condition. Tare makes readings […]