227 Maple — Boiler

NOTES: c1 is the pipe-mounted boiler sensor used for this experiment. The green c1 trace is raw temperature. The blue c1 trace is a linear empirical correction anchored at 20.2 °C after the boiler had been off for several days and at raw c1 = 86.6 °C when the existing boiler pressure gauge read approximately 6 psig; that point is mapped to 110.0 °C. Estimated boiler pressure is calculated from the corrected temperature using pure-water saturation pressure and a standard sea-level atmosphere of 1013.25 hPa. The BME280 temperature shown in yellow is display-adjusted by -18 °C; its pressure and humidity are shown directly, and the BME280 is not used in the empirical boiler-pressure calculation. The tempNEW t1/t2 panel directly displays the two DS18B20 values from tempNEW.txt over the same 40-minute window. Experimental instrumentation only — not a safety control and not a replacement for the boiler's pressure gauge, pressuretrol, low-water cutoff, relief valve, or other certified controls.