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Gefran’s GFLooper multi-loop controller provides multi-loop process control for eight- or 16-zone configurations in a compact package.

Aimed at precise temperature control in multi-zone furnaces, thermoformers, dryers, small extruders and ‘hot-runner’ injection press applications, the controller includes graphics software for straightforward configuration and monitoring across the total multi-loop process.

The GFLooper may be used with all Geflex (GFX) series temperature and process controllers, GFVedo series operator panels via high-speed Modbus RTU communication or with backplane-mounted Gilogik II series analogue and digital input/output PLC modules.

The graphically programmed GFLooper is available in a choice of 3.5in (8.9cm) and 5.7in high-resolution TFT colour, 1/4 VGA touch screens with IP65 front protection.

Multiple screens designed for ‘no-manual’ programming include the display of basic parameters on shared pages and complete details on individual pages for each zone.

The programming methodology includes the combination of tactile and ‘soft’ touch-screen keys with numeric and alphanumeric symbols, ticks, icons and complete multilingual messages.

Supervision and configuration pages are accessed via a fast menu system with preloaded application programs for four- to 16-loop control included to simplify setup.

The list of programmable control parameters available includes PV, SP, output power and alarms with advanced control algorithms, providing the management of process variables for on/off, P, PI, PID, ‘heat or cool only’ and ‘heat and cool’.

Cooling can be set by specifying the type of fluid used and an integral auto-tuning feature helps establish optimum PID parameters under all conditions.

The GFLooper includes active and historic alarm functions with programmable levels and clear message feedback with key or external reset.

Recipes for work parameters for all zones provide the simple management of device setup and ensure error-free operation at all times.

The controller also includes self tuning, soft start, sensor diagnostics, solid-state actuator diagnostics, calendar functions, four-level passwords, trend pages and comprehensive diagnostics.

The data transfer of recipes and configuration parameters is also possible via a USB port key.

The GFLooper suits distributed or integrated control architectures with communication options, including Ethernet, Modbus RTU, Modbus TCP, Profibus DP and USB.

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