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LM1830 Datasheet(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. LM1830
Description  Fluid Detector
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
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LM1830 Datasheet(HTML) 1 Page - National Semiconductor (TI)

   
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TLH5700
February 1995
LM1830 Fluid Detector
General Description
The LM1830 is a monolithic bipolar integrated circuit de-
signed 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
Features
Y
Low external parts count
Y
Wide supply operating range
Y
One side of probe input can be grounded
Y
AC coupling to probe to prevent plating
Y
Internally regulated supply
Y
AC or DC output
Applications
Y
Beverage dispensers
Y
Radiators
Y
Water softeners
Y
Washing machines
Y
Irrigation
Y
Reservoirs
Y
Sump pumps
Y
Boilers
Y
Aquaria
Logic and Connection Diagram
Dual-In-Line Package
TLH5700 – 1
Order Number LM1830N
See NS Package Number N14A
C1995 National Semiconductor Corporation
RRD-B30M115Printed in U S A


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