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Measuring, detection, monitoring, regulating and communication apparatus for operation, control and maintenance of compressors, in particular refrigerant compressors, condensers, oil separators, power generating machines, expansion machines, mechanical installations for operating steam turbines or steam machines with organic working fluids (organic Rankine Cycle installations); Measuring, detection, monitoring, regulating and communication apparatus for operation, control and maintenance of cooling machines, cooling installations, refrigerating machines, refrigeration units for transport, multi-compressor refrigeration installations comprising a number of compressors, air conditioning apparatus, air conditioning installations, refrigerant condensers, evaporators, condensing units (consisting of refrigerant compressors, condensers and liquid collectors), refrigerant liquid collectors, separators for purifying refrigerants; Measuring, detection, monitoring, regulating and communication apparatus for operation, control and maintenance of heat exchangers, heat pumps, heat recovery installations and installations for waste heat utilisation; Computer software for operation of all of the aforesaid measuring, detection, monitoring, regulating and communication apparatus; none of the aforementioned goods for use in actuators or flow control valves; none of the aforementioned goods for or in relation to fire detection or fire protection