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Lurch - your PM box is full

Discussion in 'Other Chatter' started by gregorach, Apr 4, 2011.

  1. gregorach

    gregorach Bushcrafter (boy, I've got a lot to say!)

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    I was going to be a bit of a cheeky bugger and ask your opinion on one of these for fermentation temperature control... ;)
     
  2. Lurch

    Lurch New Member

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    Just cleared it out!
    The Watlow piece looks OK, pricey maybe? Perhaps you've found one second hand somewhere?
    If you are buying new then me old mucka at http://www.tdthermal.co.uk/ can help you out with stuff at the right price.
     
  3. gregorach

    gregorach Bushcrafter (boy, I've got a lot to say!)

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    There's a chap selling a few on eBay at the moment... (The model with one DC output and one mechanical relay - model hcjaaao​g.) Still not the cheapest PIDs going, but I worry that I'm not reading the specs right sometimes... I'm not really familiar with PIDs and I've heard a few stories about people finding that their bargain PIDs will only operate one channel at a time. Fine for HERMS, but sod-all use for fermentation control. Plus the "ramp to setpoint" feature looks especially useful for fermentation control - I don't like driving temperature changes too rapidly because it upsets the yeast, and that unit seems like it would solve that worry very nicely. Plus the option of datalogging to a PC is just the sort of thing to get my propeller spinning... ;) (Not likely to use it in reality, but it's always nice to have the option.)

    So, if I'm understanding all this, I should be able to drive my coolant recirculation pump off the relay output, and drive the heater belt via a SSR on the DC output, right?
     
  4. gregorach

    gregorach Bushcrafter (boy, I've got a lot to say!)

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    A wee bit of advice on thermocouple selection would be handy too. ;) I see a lot of people talking about PT100s - is that what I should be looking at for this application? I'm a little worried that most of the PT100s I can find might not fit down my thermowell...
     

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