I tried to hose clamp the thermometer tot he boiler but the hose clamp was too big to go under a nut around the boiler, instead I put a piece of metal between the case of the aroma and the boiler. Between the boiler and the case I was able to "clamp" the thermometer against the boiler. Then I drilled a hole on top and fed it thru.
When I turn it on for about half an hour, the brew temp reaches about 190 F. When I turn on the steam button it reaches max so far is 231 F. When it was at 220 F, I warmed up a cup, brew a shot from the shower screen and measure the temp of how hot the water actually is it said 180 F.
So I pressed the steam and waited till it was 230F and pulled a shot, it blonded almost immediately and tasted sour. I feel weird about pulling a shot at max steam temp, I am not sure if the method of measuring the actual water temp I am doing is correct or if the different approach to clamping the thermometer inaccurate.
Well, nice try! What you have done is not a PID, rather just attaching a thermometer to someplace inside your case. You do not know what the temp offset is between the temp of the water and where you have your thermometer.
PID units, designed by the manufacturer to work with specific coffee machines, have a preset differential dialed in to account for where the sensor is located and what the actual temp of the water is. The water temp can be very different than the metal pieces you can attach a thermometer to.
A way to guess, and sort of get close is to have your thermometer in use and use a thermometer with a styrofoam cup. Take a reading of the brew water in the cup, shortened to be very close to the GH, with an instant read thermometer and at the same time, note the temp of your installed thermometer. The temp of the cup thermometer will be in the ball park of 3 to 5 deg f cooler than the actual water temp IF THE THERMOMETER HAS BEEN ADJUSTED TO READ ACCURATELY, THEY ARE NOT ALL CORRECT STRAIGHT FROM THE FACTORY
Subtract the reading of your installed thermometer from that of the cup one and you will know how much you need to read different from reality vs the installed thermometer for a given shot temp.
In real life, my name is Wayne P.
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I got the machine to be stable at 181 F and brew a shot into a styrofoam cup and measured it to be 178 F, however when I brought the machine temp up to 225 F, and brew a shot, it only read 180 F... thermometer must be busted.
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