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  1. #1711
    Senior Member JIGSAW's Avatar
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    Quote Originally Posted by Chris S View Post
    Just looked at a review of the DTC 1200. The functions are exactly the same as the STC 1000. Main difference is the looks and the fact that you get a 12v DC version.

    I'm in need of something else. For example if setting temp to 20c I would like it to switch on fridge compressor 20.5 and off at 20.2 for example.
    I find currently even if the compressor switches off at 20c it will overshoot and temp will head towards 19.5 and then switch the heater on. It causes to much swinging in temp.
    If anyone knows of something like this let me know.
    the SCT-1000 also came in a 12V version
    The Problem With The World Is That Everyone Is A Few Drinks Behind.!


  2. #1712
    Quote Originally Posted by Chris S View Post
    Just looked at a review of the DTC 1200. The functions are exactly the same as the STC 1000. Main difference is the looks and the fact that you get a 12v DC version.

    I'm in need of something else. For example if setting temp to 20c I would like it to switch on fridge compressor 20.5 and off at 20.2 for example.
    I find currently even if the compressor switches off at 20c it will overshoot and temp will head towards 19.5 and then switch the heater on. It causes to much swinging in temp.
    If anyone knows of something like this let me know.
    I think your best bet is going to be one of the raspberry pi builds. One with two temp sensors. Ambient and fermentation.

    https://www.brewpi.com/

    Whats your setting like on the stc? Ill be honest I dont have such a detailed view of the temp like you but with a 10 minute delay it doesnt look like it switches othen, and I generally see a +-0,3 variance

  3. #1713
    Senior Member JIGSAW's Avatar
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    +1 If I have mine set to say 20 with a 1 differential in either direction, for the most it hovers around 20 ... takes forever to move between 19 and 21


    Where is your probe attached ... It's weird that it drops so low so quick after the fridge went off?
    The Problem With The World Is That Everyone Is A Few Drinks Behind.!


  4. #1714
    Quote Originally Posted by JIGSAW View Post
    +1 If I have mine set to say 20 with a 1 differential in either direction, for the most it hovers around 20 ... takes forever to move between 19 and 21


    Where is your probe attached ... It's weird that it drops so low so quick after the fridge went off?
    My probe is in a thermo well right done in the liquid. So by the time 40L drops to 20c the fridge is a lot cooler with ice already on the back plate.
    This will drop it to 19.5 and cause the heater to come on. Luckily it's winter so the fridge part only comes on once a day, mostly late afternoon

    See attached pic. Everytime it hits 20.5 it will drop it to 19.5 like a roller coaster

  5. #1715
    Quote Originally Posted by Chris S View Post
    My probe is in a thermo well right done in the liquid. So by the time 40L drops to 20c the fridge is a lot cooler with ice already on the back plate.
    This will drop it to 19.5 and cause the heater to come on. Luckily it's winter so the fridge part only comes on once a day, mostly late afternoon

    See attached pic. Everytime it hits 20.5 it will drop it to 19.5 like a roller coaster
    I think the problem here is that the liquid has a high heat capacity, so even though the environment drops below target, the liquid hasn't yet, causing your cooling circuit to stay active. What I did for the couple of times I used the fridge in our caravan (have a stand alone controller hooked up to an extension cord) was to simply let the probe check the environment temperature, not the liquid temperature.

  6. #1716
    Quote Originally Posted by SykomantiS View Post
    I think the problem here is that the liquid has a high heat capacity, so even though the environment drops below target, the liquid hasn't yet, causing your cooling circuit to stay active. What I did for the couple of times I used the fridge in our caravan (have a stand alone controller hooked up to an extension cord) was to simply let the probe check the environment temperature, not the liquid temperature.
    Yeah thats the thing. It takes long to cool the liquid. By the time it reaches 20c the ambient is probably below 10
    I need to play with this. Might try a 0.3 degree difference instead of 0.5 and see if it holds a better range

  7. #1717
    Quote Originally Posted by Chris S View Post
    My probe is in a thermo well right done in the liquid. So by the time 40L drops to 20c the fridge is a lot cooler with ice already on the back plate.
    This will drop it to 19.5 and cause the heater to come on. Luckily it's winter so the fridge part only comes on once a day, mostly late afternoon

    See attached pic. Everytime it hits 20.5 it will drop it to 19.5 like a roller coaster
    Ahh That Explains it.. Some guy on Homebrewtalk did n bunch of expiriments with proble placement, he tested ambient, thermowell, in a can of water, and insulated against the side

    and the best was insulated against the side.. he had the same experience with the thermowell that you had it dropped way to low by the time the beer changed temp.. the thermal mass of the beer is too much

  8. #1718
    I have my STC probe stuck to the outside of my fermenter with no heating gadget attached.. just the freezer chiller.. my freezer has a 'volume' knob on the outside, so I set it to mild freezing, so that when the freezer comes on, it doesn't go to -1000 in an instant, rather I think that it will get colder slower..

    Then my STC is set for +-0.5C variance with delay on 10mins.

    Given I'm doing lagers currently in the freezer, fermenting between 9 and 14CI don't need any heating at this stage.. yes probably need one if I want to do an ale at 18 ..20 .. but did a SAPA last couple week and found that CPT ambient temps and fermenters zipped in a sleeping bag, keeps the temperatures fairly constant - I can see on the thermometer strip stuck to the outside of the fermenter..

  9. #1719
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    Quote Originally Posted by Chris_za1 View Post
    What's the power usage generally on these?
    I have absolutely no idea.

  10. #1720
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    Quote Originally Posted by Jitters View Post
    and the best was insulated against the side.. he had the same experience with the thermowell that you had it dropped way to low by the time the beer changed temp.. the thermal mass of the beer is too much
    agreed, the thermal density of the beer implies that if the core temps drops to the trigger point the outside layers of beer are well below, by the time your heat pad starts becoming effective, the core will be too cold, and you'll get a distinct see-saw on the temp

    I work on a temp point around the mid-height of the fermenter. I use duct tape to attached the probe.

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