The Contrec Model 515 (Application FP01) is a net consumption flow computer for petroleum-type products, built to add or subtract two independent frequency flow channels – typically a feed line and a return line – to work out the true net consumption rather than just gross flow on one line. This is the setup you’d normally see on engine test cells, boiler efficiency checks, and facility fuel consumption loops where you need to know what was actually burned or used, not just what passed the meter.
Each of the two channels gets its own temperature input and volume correction, using onboard fluid tables covering standard petroleum products, gasohol blends, ethanol-water mixtures, and user-defined custom fluids. So if your feed and return lines run at different temperatures, or even slightly different fluid blends, the 515 corrects each channel independently before doing the subtraction.
In actual application, this application code is normally paired with two turbine or PD meters already fitted with frequency pickups, one on each line. The 515 has an onboard adjustable transducer excitation supply so you can power the field transmitters directly, plus 4-20mA retransmission, pulse outputs, and dual RS-232/RS-485 ports supporting Modbus RTU or a ticket printer, so it fits into most existing plant setups.
Before we quote this, we would normally check the fluid type on each channel (and whether it matches one of the built-in tables or needs a custom curve), the meter pulse output type, the temperature range on each line, and what output signals your control system needs. Hope this helps.
