LM903 Datasheet (National Semiconductor)

LM903, Fluid Level Detector

The LM903 uses the thermal-resistive probe technique to measure the level of nonflammable fluids A low fluid level is indicated by a warning lamp operating in continuous or flashing mode All supervisory requirements to control the thermal-resistive probe including short and open circuit probe detect

LM903 Features

* Y Y Y Y Y Y Y Y Y Y Flashing or continuous warning indication Warning threshold externally adjustable Control circuitry for thermal-resistive probe Switch on reset and delay to avoid transients 600 mA flashing lamp drive capability Short and open circuit probe detection 70V transient protection on