How to control a heatin element

Discussion in 'The Projects Forum' started by diesalweasel, Mar 6, 2015.

  1. diesalweasel

    Thread Starter New Member

    Aug 28, 2010
    21
    0
    Hi there what would I need to control a heat element say from a tumble dryer or washing machine kettle etc. I want something what works from 70° to around a 100°. is there anyway I could restrict the voltage. I live in the United Kingdom and we run 230v ac
    I want to build a aluminium hot plate about a 1 foot squared . And help I would appreciate many thanks regards James. I'm not to far away from a maplin store
     
  2. wayneh

    Expert

    Sep 9, 2010
    12,123
    3,048
    By "control", you mean to hold a preset temperature, like a thermostat?
     
  3. MaxHeadRoom

    Expert

    Jul 18, 2013
    10,548
    2,373
    Triac or a SSR.
    For simple control there is 'Dimmer' style controller for power tools that have extra current capability.
    Max.
     
    diesalweasel likes this.
  4. tracecom

    AAC Fanatic!

    Apr 16, 2010
    3,869
    1,393
    If you mean manual control, a dimmer switch should work.
     
    diesalweasel likes this.
  5. Dodgydave

    Distinguished Member

    Jun 22, 2012
    4,986
    745
    You need a thermostat circuit,or a light dimmer, what voltage do you want to change it to?
     
  6. MaxHeadRoom

    Expert

    Jul 18, 2013
    10,548
    2,373
    Many hot plates operate without thermal feedback just simple phase control.
    Max.
     
    diesalweasel likes this.
  7. diesalweasel

    Thread Starter New Member

    Aug 28, 2010
    21
    0
    All I want to do is with out to much complicated. If I use a dimmer switch I should be able to dim the heat. Say for example we got a cooker hob element and that reaches a max temp of 200c I want to bring it down to at least half that. I can always use an infared heat laser to find out what temp I'm at. And use the dimmer to get the temperature I require.. would this work
     
  8. diesalweasel

    Thread Starter New Member

    Aug 28, 2010
    21
    0
    Yes
    A few people in here have suggested a dimmer switch that should hold at a temp I require
     
  9. MaxHeadRoom

    Expert

    Jul 18, 2013
    10,548
    2,373
    Like I said, you would need the industrial/power tool version, the light-dimmer style may prematurely fail.
    Max.
     
    diesalweasel likes this.
  10. Dodgydave

    Distinguished Member

    Jun 22, 2012
    4,986
    745
    diesalweasel likes this.
  11. diesalweasel

    Thread Starter New Member

    Aug 28, 2010
    21
    0
    Something on the lines of electric drill speed controller
     
  12. diesalweasel

    Thread Starter New Member

    Aug 28, 2010
    21
    0
  13. MaxHeadRoom

    Expert

    Jul 18, 2013
    10,548
    2,373
    Yes.
    Max.
     
  14. wayneh

    Expert

    Sep 9, 2010
    12,123
    3,048
    What you need depends a lot on your heating element - its peak wattage. I would not use a "1000W" dimmer for a 1000W heater. I'd want some overhead on the rating, and certainly do not use a 1000W dimmer with a 1500W element.

    You may be disappointed with the precision of temperature control. Without a thermostat, it may swing a lot and unpredictably, depending on what you are doing with it.
     
  15. kamaka71

    New Member

    Mar 6, 2015
    6
    0
    Hi. I'm new here and not trying to step on toes but maybe have look at a dedicated temp controller. A quick ebay uk search turned up this. It's a PID controller, with 40amp ssr relay. Even comes with a thermocouple to dial in the temp just right. A deeper search may turn up something cheaper and more in your amp range. HTH
     
  16. #12

    Expert

    Nov 30, 2010
    16,298
    6,808
    If you need that kind of quality, that looks like a good price (to me). One of the perpetual problems here is people asking for measurements or controls and having no clue about how accurate they want it.
     
Loading...