Liquid level sensor using thick film substrate

Details Liquid level sensor using thick film substrate Liquid level sensor using thick film substrate

2006-07-19

2009-10-06

Williams, Hezron (Department: 2856)

Measuring and testing

Liquid level or depth gauge

Thermal type

Reexamination Certificate

active

07596998

ABSTRACT:
In many applications, where the level of a liquid needs to be monitored (and possibly controlled), it is not necessary to provide a continuous (analog) liquid level signal, but limit sensing to one (or two) discrete levels over a small level range. In this case, a ceramic substrate sensor with discrete thermistor/heater pairs provides necessary information to control the level of the fluid. Protection of the substrate from liquid (and potential contaminants) is accomplished by coating the surface with an inert glass (“glaze”) layer and/or polymer layer (e.g., “Parylene”). Packaging of the coated substrate is accomplished by protective base, epoxy, and slosh shield. Cost can be significantly reduced over a prior art multiple thermocouple based sensor design, since discrete electronic components are avoided or reduced. Also, the number of pins, and therefore electrical connections, can be significantly reduced.

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