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PLEASE HELP ME DECIDE..

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  • #16
    Re: PLEASE HELP ME DECIDE..

    pravspresso,

    You cant measure the temperature with the probe just below the PF..... it needs to be in the PF (ideally sitting on top of the puck)..... and there are special devices to do that.... The rate of flow must also be correct 30ml in 30 sec.... or the temperature will be lower (water doesnt spend long enough in the HX)

    The only (relatively inaccurate) method to do it without the special PF is to use a foam cup with the probe in the bottom of it.... held right up into the group assembly where the PF would go..... and that will also generally indicate lower temperature as well due to the flow rate being too high (and if the water falls through air at all the temperature will also drop).

    I think the error is more likely caused by technique used to measure rather than an actual machine fault....

    The proof is in the cup - does the espresso produced taste sour?.... if not the temperature is probably OK.

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    • #17
      Re: PLEASE HELP ME DECIDE..

      Hey guys..so i contacted chris coffee.

      and basically..he says i have too measure temps in the porta with a fluke temp.monitor.

      I used a digital thermometer at the base of the porta and a manual one...

      I mean i can put my goddam fingers in the water and its not hot enough to bother me.

      SO that should be the marker that something is wrong.

      I dont need a fluke monitor?

      CHeese louise.

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      • #18
        Re: PLEASE HELP ME DECIDE..

        The problem with measuring temperature on a HX or a thermoblock machine is these units are ONLY dynamically stable (and that applies to measuring by hand as well).

        To get a real temperature water must be flowing through the HX or themoblock at the correct rate (the same rate as you extract) - just pushing the brew button without coffee in the PF will cause the water to flow through at the "water deficit" rate - which is many times the true extraction rate.

        At this rate of flow the water will be cooler - far cooler. That is why special PFs have been designed which restrict the water flow as if a coffee puck was in the basket. The probe (which is a small thermocouple junction - not a large metal "wand") is placed right where the water comes out of the showerscreen.

        As several people found, measuring the temp the way you are trying to with thermoblocks produced readings which were low- way too low - because of lack of control of the water flow rate..... and a HX is the same.... you need to get the flow rate correct.

        Some people have had success with a small bead type thermocouple which they have fed into the basket (loaded with coffee), laid the bead on top of the puck and locked the basket in place- the lead must be very thin to get through the PF seal without damaging the seal and creating a leak.

        But at the rate of flow you have temperatures will be low - way low!!!

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        • #19
          Re: PLEASE HELP ME DECIDE..

          its working now..

          service dude...

          made an adjustment on pressure stat.

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