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It is capable of being used solely to control the Lambda potential of the furnace, or as an integrated controller where this variable is controlled in conjunction with temperature. Additional features provide maths and combined logic functions.
At the heart of the controller is a specially designed function block capable of accepting most zirconia probes. Standard features include an automatic probe cleaning routine, a sooting alarm and diagnostics indicating that the probe is about to fail and should be replaced.
For standard applications, controllers are shipped pre-configured to the users specification, using a simple to complete order code. User customisation can be achieved by reconfiguring the controller via its front panel interface or the Eurotherm® iTools configuration software.
The 2704CP is fully compatible with the standard 2704 process controller which is capable of up to three PID control loops; data sheet number HA026669
Trending enables the user to view, both current and historical information on the process on the process variable and setpoint of each control loop.
The 2704 user interface offers the user an extremely easy method of editing, selecting and running programs and all programs can be given a meaningful name. Its programmer functions are very advanced and can be easily interfaced to remote instruments including specialised Mass Flow controllers. Program editing can be achieved using a PC running the iTools setpoint program editor.
Trending enables the user to view, both current and historical information on the process on the process variable and setpoint of each control loop.
The 2704CP can interface directly to most commonly available zirconia probes including Barber-Colman, Drayton, SSI and Marathon.
The zirconia probe input can be configured to measure oxygen making the 2704CP ideal for applications such as carburising furnaces and endothermic generators.
An automatic probe cleaning routine is available where either by a digital event or on a timed basis, an output is energised to perform a probe “burn off”. While the burn off is in progress and during a timed recovery period the measured PV is frozen so that closed loop control can continue. Other control options during cleaning can be configured.
Diagnostic facilities are also included. A sooting alarm indicates that potentially soot is about to be deposited in the furnace. Continuous measurement of probe impedance and automatic monitoring of the probe recovery from cleaning ensures optimum furnace operation.
Add, Subtract, Log, Exp, SQRT, AND, OR, Max, Min, Select and many more.
Toolkit blocks allow the user to create custom solutions by internally wiring analogue and digital operations together in flexible ways. 24 analogue and 32 digital operations are available. Other functions are available including timers, totalisers and a real time clock.
