An ultrasonic flow meter for measuring the flow of a fluid through a pipeline, the ultrasonic flow meter comprising: a spool piece (105, 705, 405) having a throughbore (130, 730, 430) and a transducer port (165, 765, 465), wherein the transducer port (165, 765, 465) has a central axis (166, 766, 466) and extends through the spool piece (105, 705, 405) from a first end at the throughbore (130, 730, 430) to a second end at an outer surface of the spool piece (105, 705, 405); a transducer assembly (200, 800, 500) disposed within the transducer port (165, 765, 465), wherein the transducer assembly (200, 800, 500) is configured to send and receive acoustic signals passing across the fluid flowing through the throughbore (130, 730, 430) of the spool piece (105, 705, 405), the transducer assembly (200, 800, 500) comprising a transformer (252, 818, 552), a piezoelectric element (212, 812, 512), and an electrical coupling (235, 835, 535) therebetween, wherein the electrical coupling (235, 835, 535) electrically couples the transformer (252, 818, 552) to the piezoelectric element (212, 812, 512); and a port cover assembly (300, 900) coupled to the transducer assembly (200, 800, 500), wherein the port cover assembly (300, 900) comprises: a cover cap (304, 904) releasably coupled to the spool piece (105, 705, 405); a tubular member (302, 902) coupled to the cover cap (304, 904) and releasably coupled to the transducer assembly (200, 800, 500), wherein the cover cap (304, 904) is axially translatable relative to the tubular member (302, 902), and wherein the tubular member (302, 902) has an inner surface (308c, 908c) and a stop ring (310, 910) extending therefrom; and a spring (306, 906) compressed between the cover cap (304, 904) and the stop ring (310, 910); wherein the spring (306, 906) biases the tubular member (302, 902) and the transformer (252, 818, 552) toward the piezoelectric element (212, 812, 512) to maintain electrical coupling of the transformer (252, 818, 552), the electrical coupling (235, 835, 535) and the piezoelectric element (212, 812, 512), and to resist a cable from being electrically uncoupled from the transducer assembly (200, 800, 500); and wherein the port cover assembly (300, 900) receives the cable, coupled to the transducer assembly (200, 800, 500), for carrying a signal created by the piezoelectric element (212, 812, 512) to an electronics package configured to receive and process the signal and determine a flow rate of the fluid flowing through the throughbore (130, 730, 430) of the spool piece (105, 705, 405). a spool piece (105, 705, 405) having a throughbore (130, 730, 430) and a transducer port (165, 765, 465), wherein the transducer port (165, 765, 465) has a central axis (166, 766, 466) and extends through the spool piece (105, 705, 405) from a first end at the throughbore (130, 730, 430) to a second end at an outer surface of the spool piece (105, 705, 405); a transducer assembly (200, 800, 500) disposed within the transducer port (165, 765, 465), wherein the transducer assembly (200, 800, 500) is configured to send and receive acoustic signals passing across the fluid flowing through the throughbore (130, 730, 430) of the spool piece (105, 705, 405), the transducer assembly (200, 800, 500) comprising a transformer (252, 818, 552), a piezoelectric element (212, 812, 512), and an electrical coupling (235, 835, 535) therebetween, wherein the electrical coupling (235, 835, 535) electrically couples the transformer (252, 818, 552) to the piezoelectric element (212, 812, 512); and a port cover assembly (300, 900) coupled to the transducer assembly (200, 800, 500), wherein the port cover assembly (300, 900) comprises: a cover cap (304, 904) releasably coupled to the spool piece (105, 705, 405); a tubular member (302, 902) coupled to the cover cap (304, 904) and releasably coupled to the transducer assembly (200, 800, 500), wherein the cover cap (304, 904) is axially translatable relative to the tubular member (302, 902), and wherein the tubular member (302, 902) has an inner surface (308c, 908c) and a stop ring (310, 910) extending therefrom; and a spring (306, 906) compressed between the cover cap (304, 904) and the stop ring (310, 910); a cover cap (304, 904) releasably coupled to the spool piece (105, 705, 405); a tubular member (302, 902) coupled to the cover cap (304, 904) and releasably coupled to the transducer assembly (200, 800, 500), wherein the cover cap (304, 904) is axially translatable relative to the tubular member (302, 902), and wherein the tubular member (302, 902) has an inner surface (308c, 908c) and a stop ring (310, 910) extending therefrom; and a spring (306, 906) compressed between the cover cap (304, 904) and the stop ring (310, 910); wherein the spring (306, 906) biases the tubular member (302, 902) and the transformer (252, 818, 552) toward the piezoelectric element (212, 812, 512) to maintain electrical coupling of the transformer (252, 818, 552), the electrical coupling (235, 835, 535) and the piezoelectric element (212, 812, 512), and to resist a cable from being electrically uncoupled from the transducer assembly (200, 800, 500); and wherein the port cover assembly (300, 900) receives the cable, coupled to the transducer assembly (200, 800, 500), for carrying a signal created by the piezoelectric element (212, 812, 512) to an electronics package configured to receive and process the signal and determine a flow rate of the fluid flowing through the throughbore (130, 730, 430) of the spool piece (105, 705, 405).