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battery powered level gauge float level switch China level sensor manufacturer ATEX explosion-proof level sensor 4-20mA level trans corrosion-resistant level sensor flood prevention level sensor SCADA level system boiler level gauge magnetic flap level gauge IP68 waterproof level sensor tank overflow prevention FCC certified level gauge 4-20mA level transmitter oil tank level gauge c radar level gauge water tank level control dry run protection level switch water level moni RTU level acquisition wireless level gauge SIL2 certified level measurement chemical tank level sensor level alarm system export level measurement factory direct level gauge reservoir water level measurement non-contact level measurement deep well level gauge S