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 These
devices utilize the Thermal Dispersion principle of the dissipation
of heat by a liquid to detect the presence or absence of a liquid
as compared with air. The sensor contains a resistor in the form
of a thermistor. The thermistor acts as a heater when voltage
is applied to it. It also detects heat and converts heat into
an electrical signal. When the heat generated by the thermistor
is dissipated by liquid, a switch output occurs.
Thermal Dispersion Advantages:
Very
accurate
. Stable
. Good sensitivity
Thermal
Dispersion Disdvantages:
Sensitive
to fluid property changes
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