The XKC-Y25-PNP (5-12V) non-contact liquid level sensor is randomly selected for this quick intro post. The sensor has a 4-pin connector (XH2.54 4P) at the end of its cable. The connector pinout ...

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.

AutomationDirect has extended its offering of industrial sensors to include the PEW series of stainless steel DC proximity sensors. The shielded 8mm sensors are flush-mountable and feature a 2mm ...

This sensor will be very useful for monitoring the extremely low levels of PNP in environmental samples. PNP is widely used in the manufacture of drugs, fungicides and dyes and to darken leather.