Eurotherm's Model 2704 is a powerful multifunction controller/programmer available in a single, dual or three-loop format. The instrument is designed for demanding, high-accuracy multiloop control applications such as critical batch production processes in the food, brewing and distilling industries.
The 2704 features an innovative 120 x 160 pixel electro-luminescent display on which all the process information is displayed. Process and programming information can thus be presented in bright, easily understood graphical form, making programming and set-up and operation much simpler. The user interface is menu driven via the display and seven front panel keys provide extreme flexibility and ease of operation.
A self-correcting input circuit maintains calibration accuracy. This maximises accuracy and performance during warm up and changes in ambient temperature. Configuration is achieved either via the front panel interface or by using Eurotherm's proprietary iTools configuration package running under the Windows 95 or NT operating systems.
The key to the 2704's accuracy is an advanced control algorithm giving virtually 'straight line' control. Automatic tuning simplifies the commissioning procedure by performing a one shot tune to calculate the optimum PID and cutback values for each loop. To further optimise each control loop, gain scheduling can be used to automatically transfer control between up to three sets of PID values.
A useful graphical display option called 'trending' enables the operator to view both current and historical information on the process variable and setpoint of each loop. Both the measurement range and timeframe may be modified. Up to 50 programs may be stored, with a maximum of 500 segments, allowing control loop setpoints to follow a predetermined series of ramp and dwell segments. Each program may profile up to three separate variables with each connected to its own control loop. Alternatively, one profile may be assigned to more than one loop.
To increase digital I/O capability, the 2704 uses a DIN rail mounting expander - common to other instruments in the 2000 Series family - which can increase I/O up to a maximum of 20 inputs and 20 outputs. This facility provides the option for greater remote operation of the programmer and expands the 2704 controller PLC logic capability. Communication to this unit is via a 2-wire proprietary communication link.
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