Capacitance switches for sensing the level of fluid being processed or stored, and for continuously and automatically self-testing its electronic system integrity, and for generating an alarm signal to indicate an integrity fault or a dangerous fluid level condition, said switch being fixed to the fluid processing or storage enclosure

'alarm':29 'automat':17 'capacit':1 'condit':41 'continu':15 'danger':38 'electron':22 'enclosur':52 'fault':35 'fix':45 'fluid':8,39,48 'generat':27 'indic':32 'integr':24,34 'level':6,40 'process':10,49 'said':42 'self':19 'self-test':18 'sens':4 'signal':30 'storag':51 'store':12 'switch':2,43 'system':23 'test':20

ZIRCON

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