Temperature Controller

Discussion in 'Anything DIY Related' started by Manic, 10 Jun 2010.

  1. Manic

    Manic Moderator

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    Hey Everyone,

    Anyone have any ideas on a temperature controller that can turn my fans on when the temp is to high and then turn on my heaters when it is low.

    I found this controller on ACDC:

    The controller is R485.00
    The probe is R129.00

    I think this controller should be able to what I need. Anyone else think it will work:

    [​IMG]
     
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  3. viper357

    viper357 Admin MASA Contributor

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    Dont know much about these things, it looks ok, you will have to find out what the probe is made of though and ensure it is safe to use in a salt water environment.
     
  4. brettb2020

    brettb2020

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    that will work great as temp controller, i have used them in the airconditioning industry which is what they are typically designed for however you will probably find that the probe is also designed for air. just make sure of that, as Viper said.

    another option is if you just controlling fans you can build a little circuit to control that, thats if you have some experience and the tools:) willing to give you hand with that. will cost a few rand.
     
  5. Manic

    Manic Thread Starter Moderator

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    The probe I want to use is this one, PTC05. It looks like it is plastic coated:

    [​IMG]
     
  6. Manic

    Manic Thread Starter Moderator

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    I want to control my fans and heaters because I don't want the fans and heaters on at the same time. If I run the fan all the time during the day my heaters can't keep up and neither can my RO unit.

    How hard would it be to build the control and how much would you expect it to cost?
     
  7. brettb2020

    brettb2020

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    well here is the circuit to control the fan only. i got it off the web and iv built it a few times. its very simple and will cost about 20 bucks.

    unfortunately if you want to control the fan and the heaters with a slight temperature gap between the 2, it becomes complicated. rather buy that one. that probe looks like it can handle liquid.

    what you could do is just set your heaters to 26 and your fans to 27. they shouldnt come on at the same time.


    [​IMG]


    [​IMG]
     
  8. lIghty

    lIghty

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    Minic, that controller you have posted can only do one function, can't control both, you would have to have 2 seperate units, 1 for heating and 1 for cooling.
     
  9. Manic

    Manic Thread Starter Moderator

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    I'm pretty sure is can do both. You connect the heaters to the normally open circuit and the fans to the normally closed circuit. Or the other way round depending on the controller. Or have I got it totally wrong...
     
  10. vatso

    vatso

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    Let us know how it goes I am interested in this if it works well
     
  11. brettb2020

    brettb2020

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    I think lighty is correct manic. its either heating or cooling. you cant connect the heater to the normally open and the fan to the normally closed. if you had to do that and you plotted your temperature on graph it would look like a sine wave.

    you need some kind of temperature gap between heating and cooling
     
  12. luwaynecrous

    luwaynecrous

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    With your controller, just use a simple relay, with a normaly open and normaly closed contact to do the switch work. Connect your heater to the n/o and the fans to n/c. When the one is on the other will be off. The relay will also help protect your controller.
     
  13. Yuri

    Yuri

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    find out if it is tipe J (then if you want to make the wire longer you will have to use coper comp wire for tipe J)
    If it is PT100 (you can use any wire)
     
  14. luwaynecrous

    luwaynecrous

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    What about getting a controller with a alarm output aswell. Switch your heater off at 26 and set your alarm for say 28 swithing on your fans.
     
  15. Yuri

    Yuri

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    also have a look at romberg thy have good cheep controlers with alarm
    I think it is 410 sum thing
     
  16. lIghty

    lIghty

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    You can't connect if tike that, as there would be no "all off" period, it would alway mean the heater would be fighting the fans, oscillating between the 2, not good!

    Doubt its a PT100, as they normally use 3 wire, and according to the "accesory" list posted, it show NTC and PTC thermo-coupler.
     
  17. lIghty

    lIghty

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    Ideally you would want to find a dual channel with indivual thresholds, and with alarm.
     
  18. amalick

    amalick

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    Of course you can connect it with a relay, just set your heaters about 0.5 degrees below what you need. When the relay energizes the heaters will have power but wont come on if the temp is above what their thermostats are set to.

    I do exactly this with the same controller

    [​IMG]
     
  19. Manic

    Manic Thread Starter Moderator

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    Thanks, that makes sense. Will this controller definitely work. Can I just connect 220V to the input, connect the probe and then connect the fan directly to the N/O port and the heaters to N/C port or do I still need a relay?
     
  20. amalick

    amalick

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    I will have to open mine up again to see which ports I use for what. I do recall only using one port tough, thats why I use a relay.

    Also if your fans are not 220v then you going to have to do something different. I assume that you have a transfomer for them?. If so then you should be fine.

    - I dont have fans,instead I use a full blown DIY aircon compressor mounted outside as a chiller

    - I will open up my unit tomorrow and provide feedback
     
  21. Yuri

    Yuri

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    I is just saver with the relay
    To pull a relay coil in you do not need a lot of amps
    But a heater pulls a lot of curent
     
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