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Chemical Engineering

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New controller brings simplicity and flexibility to single loops

| By Gerald Ondrey

The Fisher Fieldview DPC2K digital process controller (DPC2K: photo) can be retrofitted to Fisher Wizard pneumatic controllers, and to pneumatic controllers from other manufacturers. Closed-loop control is greatly improved with configurable loop types, over 150 units of supported measure, 20 times-per-second (50 ms) scan and update rates, configurable dead band and other features. These features work together to keep the process variable — typically pressure, flow, level or temperature — close to setpoint, along with greatly improved recovery from saturated conditions. The DPC2K can accept a 4–20-mA input from a two- or four-wire instrument, typically the process variable. — Emerson, Marshalltown, Iowa