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PID Temp Control for less than $50

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  • #31
    Originally posted by jbrewster View Post
    Heh, at what percentage of maximum ratings? I generally divide MTBF/other reliability figures by 5-10 to get something more reflective of reality ;P

    If it's worth engineering it's worth over-engineering ;D
    While I would agree with this for cheap Chinese parts these relays were made in Switzerland.

    The original relay was rated for 1,000,000 cycles. The machine was in a commercial setting for ~14 years where it was left on 24/7 year-round and then ran here 24/7 for 8 months out of the year for 7 years. Using the avg cycle time as measured here that means the relay had almost 2,000,000 cycles on it when it died. I'd say it's fair to say the relay was over-built and that their stated duty life was pretty fair reflection of what to expect in reality.


    Java "Very happy with the accuracy of the manufactures specs" phile
    Toys! I must have new toys!!!

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    • #32
      Originally posted by Javaphile View Post
      While I would agree with this for cheap Chinese parts these relays were made in Switzerland.
      Ahh, yeah, fair enough, the Swiss know how to engineer stuff (refer to earler comment about over-engineering)

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      • #33
        Modification of REX-C100 PID

        Hi Wilki,

        I had just received my REX-C100 with relay output. I wish to modify the pid to SSR output as you did. I have the required electronics knowledge for the jib, but not sure the proper way of opening up the PID casing (without demaging the plastic casing).

        Thus I would appreciate very much if you show me the way to do it.

        Regards.
        Tanke

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        • #34
          Originally posted by Tanke View Post
          Hi Wilki,

          I had just received my REX-C100 with relay output. I wish to modify the pid to SSR output as you did. I have the required electronics knowledge for the jib, but not sure the proper way of opening up the PID casing (without demaging the plastic casing).

          Thus I would appreciate very much if you show me the way to do it.

          Regards.
          Tanke
          I managed to open up the casing with ease. No "cracking" is necessary. The modification is straight forward.

          Thanks.

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          • #35
            Hi Guys, I dug up this thread, as I'm looking at sourcing a C100 (or maybe C700) from dx.com to mod my Silvia. For those of you who've installed a C100 (or similar), did you manage to wire it up to automatically change the temp depending on the active function? or do you manually dial in the temp on the controller, and wait until the thermocouple reads the right temp, then use whatever machine function you require (eg hot water/steam/brew)?

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            • #36
              Sorry to exhume such an old thread but fascinating read and such a shame there wasn't able to be a few more pix or general instructions for folks to follow as I'd imagine a LOT of people would definitely be interested in doing something like this given the low cost vs high reward ratio of the exercise.

              Great post by the OP and love to see more from him or anyone who's done anything similar.

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