The Model 231 Multi-Sense® wet-to-wet, differential pressure transducer from Setra Systems, Inc. is designed for flow measurement and pump monitoring. Features include switch-selectable pressure ranges, selectable analog outputs (true two-wire four to 20 mA output; three-wire zero-to-five, zero-to-10 VDC and one-to-five VDC output). Each unit has been temperature compensated to +32F to +130F (+0 to +54.4C) with zero and span accurate to within 0.02 percent per degree F. Offered in three versions, with four unidirectional and four bidirectional pressure ranges. http://www.setra.comsales@setra.com