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Thread: Surfing Silvias Wild Temperatures

  1. #1
    Senior Member robusto's Avatar
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    Surfing Silvias Wild Temperatures

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    Ive taken several readings using a new Digital MultiMeter (DMM) with a temperature function with K-type thermocouple (t/c) taped midway down Silvias boiler. *

    These temperatures fluctuate much more wildly than I thought. *From 86 to 109 degrees. *Thats 23 degrees. *Way beyond the 10 degrees mentioned to prevent thermostat burnout.

    And the element switches on and off inconsistently depending on whether the machine is cold or at operating temperature (about 40 mins pre-heat).

    These two lots of readings were taken at *operating temperature in different times of the day, starting at zero seconds when the light comes on (heating element switches on) *and at mostly 5 second intervals thereafter for 2 minutes. *

    light on 86 * 86
    10" * * * 86 * 86 * *
    15" * * * 87 * 86
    20 * * * *89 * 87
    25 * * * *90 * 89
    30 * * * *92 * 92
    35 * * * *94 * 94 *
    40 * * * *97 * 97
    43 * * * *98 (light off) *
    45 * * * * * * * 99 (light off)
    50 * * * 103 * 102
    55 * * * 105 * 105
    1 0" * *107 * 106
    1.10 * *107 * 108
    1.20 * *108 * 109
    1.30 * *109 * 108
    1.40 * *108 * 108
    1.55 * *107 * 107
    2.0 * * 106 * 107 *

    It will come as no surprise that heating continues after the light (and heater) switches off. What is surprising is by how much.

    From just under 100C *in the mid 40 seconds, to 109C.

    Residual heat and convection (water nearest element conducting heat to outer reaches of boiler) continues steadily for another 35 - 47 seconds.

    The maximum temperature reached is 109C. *But a fairly stable band is reached *between 1 and 2 after the intitial heat cycle begins...then starts dropping off again.

    So, what of all this data? * Well, in the absence of a PID, Ill now experiment *to manually cycle the heating element, using the steam switch, to prevent under or over-shooting.

    Im not talking about the usual temperature surfing: wait 40 seconds and away you go.
    At that point the temperature is still rising, though theres probably a counter-acting affect from incoming cold water. *Well see. *

    Should be fun.

    In any case, hope this data is useful and demystifies whats going on inside that brushed stainless steel box.

    Robusto


    *

  2. #2
    TC
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    Re: Surfing Silvias Wild Temperatures

    stay tuned for results on the mega-bling, pimped sylvias once the luca and chris sylviasteins hit the test bench....at this stage the list of jobs includes:

    • superpid with dual set points
      pressure mod
      ball joint steam wand
      perhaps some neon on the undercarriage?? *;D *8-)


    And why are we gonna do it....because theyre there and were curious to see just what can be done with this machine...Am not touching the giotto tho *;)

    Chris

  3. #3
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    Re: Surfing Silvias Wild Temperatures

    Chris,

    Is that the steam wand from the sunbeam you were considering at roast-a-rama? so it fits? Wonder if it would fit my mokita.

    We should pitch a show to cable where Paul Basset rocks up to someones door, takes thier machine to a speacialised coffee chop shop and tricks it out. Itd be called Pimp-Yo-Coffee-Machine. Or maybe Pizzle-Yo-Coffee-Mashizzle Fo Shizzle, Ma Nizzle

    Luke

  4. #4
    TC
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    Re: Surfing Silvias Wild Temperatures

    its off one of the machines at the academy, Luke....will report back if it fits.... :D

  5. #5
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    Re: Surfing Silvias Wild Temperatures

    Behmor Brazen - $249 - Free Freight
    waiting with baited breath.



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