PID Loop Tuning – Multi-Part Video Series – Indoor Humidity Control

DriSteem Humidifier Valve and Sprayer

DriSteem Humidifier Valve and Sprayer

Recently, I congratulated myself on being able to do something I have never been able to do in 13 years of working with Building Automation Systems and Controls… tune and utilize the Derivative portion of a PID Loop.

Ok so if you don’t know too much about how PID Loops work or if maybe you are an Engineer that studies these lil monsters you are like reading this going, “Doesn’t this guy get out much?” Well yes and no, because I was late to a Christmas party trying to tune that PID loop. What can I say… I’m The Controls Freak.

What came out of that mini-success is going to be a 3 part multi-part series of videos going over the effects and tuning properties of a PID loop. This video series will contain 3 several videos talking about the three varieties of a PID loop and how to use them to control Indoor Humidity.

  • Proportional only (P)
  • Porportional and Integral (PI)
  • Proportional, Integral and Derivative (PID)


What you will learn in these Training Videos

By taking a look at each of the three videos you will learn more about the relationship of a PID loop to the affected outputs and controls devices. I will explain and show you the reactions of the humidifier valve and associated set points based on the changes I make to the various components of the PID loop.

I will even show you some screen captures of a Multi-Trend Graph when it comes time to talk about the Derivative portion because the Derivative portion is typically used in fast moving conditions. So, it will be easier to show the differences in reaction times of a full PID loop looking at those graphs.

System: Temperature and Humidity Control System

Location: Hospital Burn Unit – Isolation Rooms
Sequence of Operation: This humidifier (HUM) is matched with a hot water coil (HWC) that is located further upstream and is used to maintain 90°F space temperature with 50% relative humidity.
Background: This high temperature and humidity combination might sound strange, but it is with some pretty significant reasons. The burn victims that will be located in these ICUs have extensive injuries and have very little skin available to protect them from the ambient conditions. Therefore it is necessary to keep the temperature close to body temperature and the air to be moist to assist the healing process.

Here are the links for the 3 Part Multi-Part Video Series

Part 1 – PID Loop Tuning Explained – Proportional Only

Part 2 – PID Loop Tuning Explained – Proportional and Integral


If you like these kinds of videos I am going to ask a favor of you. It’s not a big one.

I want you to SHARE, LIKE, TWEET, etc. this post at least ONE time via any social network below or to the right.

This will definitely give me that extra pat on the back to keep putting together more great material, posts and videos for you to consume and use.


Don’t forget sharing is caring… awww… SO DO IT!


…you won’t do it…

8 Responses to PID Loop Tuning – Multi-Part Video Series – Indoor Humidity Control

  1. Muddassar December 12, 2011 at 07:38

    Kindly send me the link. thanks.

    • The Controls Freak December 12, 2011 at 11:56

      I will share the links to everyone, no worries. Don’t forget to SHARE this post with someone using Facebook or Twitter etc.

      If you’d like you are welcome to join my growing newsletter updates so you will be kept up to date with any new posts that I make. I look forward to all the great feedback from this video series. I got a few more ideas I’m working on behind the scenes.

  2. rhett hayes December 12, 2011 at 14:00

    Hi can you email me the links please

  3. Allan Paz December 13, 2011 at 08:26


    I got interested in instrumentation and controls engg recently. I was formerly working with a big semicon company and want to know more about this part of engineering. Can you send me the link?

    Thank you

  4. Chuck Phelan December 20, 2011 at 09:30

    San Antonio ?????????????

    Go John Jay Mustangs!

    • The Controls Freak December 20, 2011 at 11:11

      Heh, nice! I actually grew up right outside the gates of Lackland AFB on Military Dr. My mom, aunt and uncle graduated from John Jay HS. Small world!

  5. Bill HIckner November 9, 2012 at 20:11

    Hi Abel,
    I watched one of your videos today and enjoyed your presentation. I run a controls company with my sons located in Seattle. We specialize in small building control systems utilizing standard package and split systems.
    Thanks for sharing your knowledge.

  6. Jose Acosta February 2, 2015 at 13:50

    We are trying tune a loop the building pump on a vfd and also the cooling tower which is on a trane summit can you help me out and links you might thank you.


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