The Series 674 differential pressure transmitter is capable of selecting up to three direct and three compound pressure ranges for measuring airflow, building or room pressure, duct pressure, and filter drop. Eight models, four of them with NEMA 4X enclosures and four configured for panel mounting, feature noninteractive zero and span adjustment (±15%), temperature compensation, short circuit, and reverse polarity protection. They can accommodate direct and compound ranges as low as 0 to 0.1 and +0.5 in. of wc, as high as 0 to 30, and +15% in. of wc providing accuracy of +1% FS.
— Dwyer Instruments, Inc.
Michigan City, IN