Abstract: A modular Coriolis flowmeter for determining a process variable of a flowable medium includes: a measuring tube module including metal measuring tube for guiding the medium, a primary exciter component arranged on the measuring tube, a primary sensor component arranged on the measuring tube, and an identifier; a carrier module including a receptacle in which the measuring tube module is arranged with a releasable connection in a first or second installation position in a mechanically fixed, yet releasable, manner, an electronics chamber in which evaluation electronics for determining the process variable are arranged, a complementary secondary exciter component, and a complementary secondary sensor component; an installation position recognition device configured to recognize the identifier and, based on this, to ascertain a current installation position, wherein the evaluation electronics are configured to determine the process variable depending on the recognized current installation position.