Results 1 to 28 of 28

Thread: Building a PID kit for Gaggia Classic

  1. #1
    Member
    Join Date
    Dec 2008
    Posts
    60

    Building a PID kit for Gaggia Classic

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    entertained myself by researching PIDs on espresso machines today..ended up buying a controller (with thermocouple included) and a solid state relay on ebay for a total price of around $95 delivery included...all i need now is an enclosure to put the unit in, wire the sucker into my machine, and set it up..cant wait for the bits to arrive...once bitten by the mod bug....theres no way of turning back...will post pics and results when fitted and running :D

  2. #2
    Senior Member
    Join Date
    Apr 2007
    Posts
    596

    Re: Building a PID kit for Gaggia Classic

    Keep us informed Bidtfaun DIY projects are always most welcome.

  3. #3
    Member
    Join Date
    Dec 2008
    Posts
    60

    Re: Building a PID kit for Gaggia Classic

    getting everything ready for when the PID & SSR arrive...made a couple of looms..left one is for the relay to element power switching. right one is for PID power source and so the PID can switch the relay on and off




  4. #4
    Senior Member
    Join Date
    Mar 2006
    Posts
    188

    Re: Building a PID kit for Gaggia Classic

    Bidtfaun -

    Your looms look good to me. Anxious to hear the final results.

    Pay close attention to the connections between your new wires and the existing brew thermostat wires. The Silvias wiring allows the use of a fully insulated male 6mm flat connector, so no conductors can become exposed.

    I think your Classic, however, might use a flag connector at the brew thermostat, so using partially insulated connectors (the red ones in your first photo) is probably necessary. Once youve joined the wires, though, inspect to be sure all the conductors are covered since these connections generally can move around a little.

    Jim

  5. #5
    Member
    Join Date
    Dec 2008
    Posts
    60

    Re: Building a PID kit for Gaggia Classic

    thanks Jim :) yeah wherever I notice bare metal where AC power will be flowing, I will insulate accordingly to protect from zappage..a little heat shrink over the whole connection should suffice. I dont wanna know what AC feels like...nor does my wife or unborn child! I am waiting on my relay, and then the fun can begin...got my controller now...am going to be installing the PID into a PVC enclosure which wont look the best..but is electrically safe and easier to cut holes out of..

  6. #6
    Member
    Join Date
    Dec 2008
    Posts
    60

    Re: Building a PID kit for Gaggia Classic

    okie dokie...one PID & one relay..to be fitted tomorrow after breakfast... :D


  7. #7
    ev
    ev is offline
    Senior Member
    Join Date
    Jan 2005
    Posts
    156

    Re: Building a PID kit for Gaggia Classic

    After breakfast????? I reckon you should do it beforehand. Itll provide the incentive to work faster!

    Good luck with it JimBob.

    Evan.

  8. #8
    Member
    Join Date
    Dec 2008
    Posts
    60

    Re: Building a PID kit for Gaggia Classic

    now now....I need coffee before i can start...silly person :P I had a laugh

  9. #9
    ev
    ev is offline
    Senior Member
    Join Date
    Jan 2005
    Posts
    156

    Re: Building a PID kit for Gaggia Classic

    You finished yet??

  10. #10
    Member
    Join Date
    Dec 2008
    Posts
    60

    Re: Building a PID kit for Gaggia Classic

    nup..about to start ....geez you old people have no patience do ya! :P

  11. #11
    ev
    ev is offline
    Senior Member
    Join Date
    Jan 2005
    Posts
    156

    Re: Building a PID kit for Gaggia Classic

    Done yet?

  12. #12
    Member
    Join Date
    Dec 2008
    Posts
    60

    Re: Building a PID kit for Gaggia Classic

    alright youve pushed me...all done..well nearly..I just have to get some of that whizzbang double sided tape you have Evan to mount it on the side of the machine..it is set to 107 deg, but will have to do the auto tune function during a few runs to teach it how the machine behaves...

    edit: forgot to mention..the hardest bit of this build was creating a thermocouple that would fit into the original brew thermostat hole...the one that came with the PID had a 6mm threaded fitting which obviously wouldnt go into a 4mm hole..so a 4mm screw had to have a hole drilled down the center of the shaft (first go too 8-))...cut off the thermocouple fitting and the exposed wires threaded through to the other side, where they were twisted and soldered with lead free solder....I would have taken a pic but didnt, and now its too late as it is fitted in the machine and there is no way I am removing it (was rather awkward to get into the boiler)...




  13. #13
    ev
    ev is offline
    Senior Member
    Join Date
    Jan 2005
    Posts
    156

    Re: Building a PID kit for Gaggia Classic

    Great stuff mate. Now, it all looks pretty schmicko but have you pulled a shot yet??

  14. #14
    Member
    Join Date
    Dec 2008
    Posts
    60

    Re: Building a PID kit for Gaggia Classic

    cheers Evan :)just pulled a decaf for my wife & I, and it was bloody beautiful..I seem to have a pretty vicious steam too...so I had a fantastic microfoam too...well worth it...just have to autotune during a few shots to teach it a few things...

  15. #15
    Senior Member
    Join Date
    Mar 2006
    Posts
    188

    Re: Building a PID kit for Gaggia Classic

    Quote Originally Posted by 0D262B3B292E3A214F0 link=1238569278/11#11 date=1239331955
    edit: forgot to mention..the hardest bit of this build was creating a thermocouple that would fit into the original brew thermostat hole...the one that came with the PID had a 6mm threaded fitting which obviously wouldnt go into a 4mm hole..so a 4mm screw had to have a hole drilled down the center of the shaft (first go tooCool)...cut off the thermocouple fitting and the exposed wires threaded through to the other side, where they were twisted and soldered with lead free solder....
    Very nicely done.

    I added a PID to a Gaggia a few months back (just for the experience and knowledge -- we do not offer kits). *I made a thermocouple probe very similar to yours, and found that it worked a little better than a washer-style probe fastened to the outside of the boiler.

    FWIW, I found that with this style probe, a setpoint of 226F (btwn 107C and 108C) gave a brew temp of 200F (93C).

    If you can find some 3M Dual Lock material, I have concluded that it is the very best stuff for mounting your enclosure.

    Jim

  16. #16
    Member
    Join Date
    Dec 2008
    Posts
    60

    Re: Building a PID kit for Gaggia Classic

    did you find any difference to the steaming Jim? my steam for some reason is now REALLY strong....makes a huge difference to the milk 8-)

  17. #17
    Senior Member
    Join Date
    Mar 2006
    Posts
    188

    Re: Building a PID kit for Gaggia Classic

    Quote Originally Posted by 153E332331362239570 link=1238569278/15#15 date=1239403048
    did you find any difference to the steaming Jim? my steam for some reason is now REALLY strong....makes a huge difference to the milk *8-)
    I left the stock steam thermostat in charge of steaming, so no change.

    Jim


  18. #18
    Member
    Join Date
    Dec 2008
    Posts
    60

    Re: Building a PID kit for Gaggia Classic

    odd that mine is stronger as I left the stock steam thermostat in too....

    anyway..here is the finished result




  19. #19
    Member
    Join Date
    Feb 2009
    Location
    Melbourne
    Posts
    59

    Re: Building a PID kit for Gaggia Classic

    Quote Originally Posted by 4C676A7A686F7B600E0 link=1238569278/11#11 date=1239331955
    the one that came with the PID had a 6mm threaded fitting which obviously wouldnt go into a 4mm hole
    Just to confirm: the Gaggia has a M2 (=4mm) thermostat hole?

    Just so I can order a fitting thermocouple...

    thx.,

    RJ

  20. #20
    Member
    Join Date
    Dec 2008
    Posts
    60

    Re: Building a PID kit for Gaggia Classic

    i believe it is M4 (which is 4mm) x0.7 (I think the thread pitch) and is 6 mm long

  21. #21
    Member
    Join Date
    Feb 2009
    Location
    Melbourne
    Posts
    59

    Re: Building a PID kit for Gaggia Classic

    Thanks.

    Quote Originally Posted by 5E7578687A7D69721C0 link=1238569278/19#19 date=1240104261
    i believe it is M4 (which is 4mm) x0.7 (I think the thread pitch) and is 6 mm long
    4mm = M2 (http://en.wikipedia.org/wiki/Screw#Thread_standards)
    which, as I just found out, matches the Gaggia spare part diagram (http://www.coffeeparts.com/gaggia/gaggia2.html).

    RJ

  22. #22
    Member
    Join Date
    Dec 2008
    Posts
    60

    Re: Building a PID kit for Gaggia Classic

    interesting....i will PM you a link...

  23. #23
    Member
    Join Date
    Dec 2008
    Posts
    60

    Re: Building a PID kit for Gaggia Classic

    ahh I see you are looking at WRENCH size, not the diameter of the bolt which if you measure with some vernier calipers is 4mm..hence M4

    upon close inspection of the parts page you linked to I see M4 under the thermostats, not M2




  24. #24
    Member
    Join Date
    Feb 2009
    Location
    Melbourne
    Posts
    59

    Re: Building a PID kit for Gaggia Classic

    Quote Originally Posted by 7C575A4A585F4B503E0 link=1238569278/22#22 date=1240135184
    ahh I see you are looking at WRENCH size, not the diameter of the bolt which if you measure with some vernier calipers is 4mm..hence M4

    upon close inspection of the parts page you linked to I see M4 under the thermostats, not M2
    Apologies, I stand corrected.

    RJ

  25. #25
    Member
    Join Date
    Dec 2008
    Posts
    60

    Re: Building a PID kit for Gaggia Classic

    no probs...saved you from getting an incorrect thermocouple!

  26. #26
    Member
    Join Date
    Dec 2010
    Posts
    94

    Re: Building a PID kit for Gaggia Classic

    Quote Originally Posted by 18333E2E3C3B2F345A0 link=1238569278/15#15 date=1239403048
    did you find any difference to the steaming Jim? my steam for some reason is now REALLY strong....makes a huge difference to the milk*

    Ive been thinking about why a pid on the brew temp might improve the steaming and I think the pid might help reduce the temperature stratification within the boiler as a side effect of making the temperature more stable over time. When the top of the boiler is at steam temperature then more of the water in the boiler is hot enough for steaming.

    Maybe.

  27. #27
    Member
    Join Date
    Jan 2012
    Posts
    50

    Re: Building a PID kit for Gaggia Classic

    Im sorry to dig this fossil up.. Thinking of PIDing my gaggia. Just cant make up my mind on the PID to get. Im going for the cheap ebay ones. Cant seem to work out whether Im misreading the ads or if some of the PIDs come with built in SSRs. Either way, I dont know if prices have dropped significantly in the past couple of years or if Im looking at the wrong things. But yeh looking for a rough price of 30-40AUD for the whole lot PID, SSR + thermocouple.

    I know i shouldnt be really posting this but heres what im looking at.

    Then dont post it. eBay link removed per site posting policy

  28. #28
    blend52
    Guest

    Re: Building a PID kit for Gaggia Classic

    mompt.
    Yes the chinese PIDs are available for $25 -$30 with TC and free postage, likewise SSRs for $5 delivered.
    You can actually find the bigger sized PIDs for inder $20 !!
    I havnt come across any PIDs witha "built in" SSR, but most of them do have a built in "mechanical" relay, but usually only rated for a 3A max load.
    however, i recently fitted one of these chinese cheapies ( XMT 7100) to my Silvia before my SSR arrived and used the inbuilt relay to switch the heater ( 1100W = 4.5 A).
    It worked fine, but i only did it after i inspected the PID and noticed that the internal relay was actually stamped with a 7 A rating by its maker ( Panasonic).
    I have since installed the SSR to see if the functionality changes.
    I would suggest you carefully chose the thermocouple type ( K, Pt, etc) and tip size, since i believe the placement of this TC tip can make a big difference in temp control.
    Go for it ! ;)



Similar Threads

  1. Replies: 6
    Last Post: 15th March 2012, 08:20 PM
  2. Gaggia Classic portafilter and GAGGIA PROTEO ROMANZA
    By cazby in forum Brewing Equipment - Midrange ($500-$1500)
    Replies: 0
    Last Post: 24th October 2011, 05:50 PM
  3. Replies: 6
    Last Post: 23rd November 2009, 06:19 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •