Patent classifications
G
PHYSICS
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G01
MEASURING; TESTING
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G01F
MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
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23/00
Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
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G01F23/22
by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
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G01F23/28
by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
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G01F23/292
Light; , e.g. infrared or ultraviolet
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