sensors and probes for the measurement of PH, oxidation-reduction potential, conductivity, turbidity, dissolved oxygen, ozone, residual chlorine, liquid level, fluid flow, fluid color, and associated analytical parameters, the analyzers used therewith, and electrical controllers for controlling the above-mentioned parameters, all used in connection with drinking water and waste water treatment and the control of industrial liquid processes

'above-ment':40 'analyt':28 'analyz':31 'associ':27 'chlorin':19 'color':25 'conduct':13 'connect':47 'control':36,38,57 'dissolv':15 'drink':49 'electr':35 'flow':23 'fluid':22,24 'industri':59 'level':21 'liquid':20,60 'measur':6 'mention':42 'oxid':10 'oxidation-reduct':9 'oxygen':16 'ozon':17 'paramet':29,43 'ph':8 'potenti':12 'probe':3 'process':61 'reduct':11 'residu':18 'sensor':1 'therewith':33 'treatment':54 'turbid':14 'use':32,45 'wast':52 'water':50,53

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