LM1830 Datasheet | National Semiconductor

LM1830 Fluid Detector February 1995 LM1830 Fluid Detector General Description The LM1830 is a monolithic bipolar integrated circuit designed for use in fluid detection systems The circuit is ideal for detecting the presence absence or level of water or other polar liquids An AC signal is passed through two probes within the fluid A detector determines the presence or absence of the fluid by paring the resistance of the fluid between the probes with the resistance internal to the integrated circuit An AC signal is used to overe plating problems incurred by using a DC source A pin is available for connecting an external resistance in cases where the fluid impedance is of a different...