An NPN sensor is a ‘sinking’ sensor because it sinks the output to ground whereas a PNP sensor is a ‘sourcing’ sensor because it provides positive voltage to the output. Below you can see the standard ...

The transistors used (a 2N3055 npn and 2N2955 pnp in TO-220 packages) are reasonably good choices. They should be placed on a heat sink for good heat dissipation.

The sensor has an untrimmed inaccuracy of 0.9°C, improving to 0.5°C after a single-point PTAT trim. Further compensation for resistor variation achieves a final inaccuracy of 0.1°C. An energy ...