The present invention relates to a device (1) for measuring the
alkalinity of a liquid (41) present in an external reservoir (40). More particularly, the proposed device (1) is used in the aquarium sector for monitoring
water quality (41) in marine aquariums (40), performing the mensuration and automatic correction of the
alkalinity of this water (41), especially in aquariums (40) that have
coral reefs and other sensitive organisms present in saltwater aquariums. In addition, the present invention also proposes a process for measuring the
alkalinity of a liquid (41) in an external reservoir (40). In particular, the proposed device (1) and process are characterized in that they comprise a
control unit (70) capable of determining the alkalinity of an
external liquid (41) present in an external reservoir (40) to the mensuration device (1) by using a CO2SYS method in conjunction with information previously stored in said
control unit (70).