Jonr, I know that some use a thermocouple over the lip/edge of the PF and do what you suggest. AndyPanda mentioned that on page 2 of the PID thread, before his thermofilter. Some of the DIY thermofilters, like mine, suffer from initial damping and lose the upward bump that you have seen. Not too worrisome for me as I was trying to get the approximate temperature and show that enough heat could be added in the brew to stabilize the intrashot. A little less heat will allow for a small drop or no heat back to more standard drop. The datalogged plots are great especially with rapidly responding sensors. I am happy knowing that you have done that work and show what added heat can do, including the preheating. My damped sensor may not respond as well, but that is likely a tech and display/data problem, not temperature. Fortunately I can get in the range and then use taste.
Taste in the cup trumps the plot, but I appreciate your work :)
Finally made another thermobasket with 2 holes, a 0.009 and a 0.011". I can plug either with duct tape. The 0.009 gives about 25 - 30 gm or ml in 25 seconds and the 0.011 about 55 gm or ml. If you try one of these, it is very important to wet the wire with liquid silicone lube and let it dry. The 0.009 may break instead of pull if you are not careful. The 0.011 is fairly easy to work with.
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