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LM1830 Datasheet Fluid Detector

Manufacturer: National Semiconductor (now Texas Instruments)

Download the LM1830 datasheet PDF. This datasheet also includes the LM1 variant, as both parts are published together in a single manufacturer document.

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Note: The manufacturer provides a single datasheet file (LM1-830.pdf) that lists specifications for multiple related part numbers.

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 comparing the resistance of the fluid between the probes with the resistance internal to the integrated circuit An AC signal is used to overcome 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 magnitude than that of the internal resistor When the probe resistance increases above the preset value the oscillator signal is coupled to the base of the open-collector output transistor In a typical application the output could be used to drive a LED loud speaker or a low current relay

Overview

LM1830 Fluid Detector February 1995 LM1830 Fluid Detector General.

Key Features

  • Y Y Y Y Y Y Low external parts count Wide supply operating range One side of probe input can be grounded AC coupling to probe to prevent plating Internally regulated supply AC or DC output.

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