The Model 231 Multi-Sense® wet-to-wet differential pressure transducer is ideal for users who need to monitor control pump differential pressures, chiller or boiler differential pressure drops, and flow measurement of gasses or liquids. Features include switch-selectable pressure ranges; selectable analog outputs that include true two-wire 4 to 20 mA output, 3-wire 0 to 5 VDC, 0 to 10 VDC, and 1 to 5 VDC output; and unidirectional and bidirectional ranging of span, all in one unit. - Setra Systems, Inc.