Eurothem advanced Multi-loop PID temperature controller 2704 for humidity control function

The 3508 and 3504 offer much more than temperature control — advanced features and
options make them capable of small machine control and a key part of a total process
solution.
• Temperature
• Potential
• Humidity
• Flow
• Pressure
• Level
• Viscosity
• Additive dosing
• Specialist function blocks
• Recipe selection
• Setpoint programmers
• Math
• Logic
• Timer functions
• Flexible communication options

High Precision Process Input

If you cannot measure accurately, you cannot control accurately. The 2704 offers typical resolution of 0.25uV making it ideal for applications such as semiconductor, vacuum heat treatment and research applications. All thermocouple input types are catered for, as are Pt100 resistance thermometers and linear input types such as 0-10Vdc and 4-20mA. Four wire Pt100, and Pt25 measurement is also possible using a module specially designed for high accuracy metrology applications.

The 2000IO expander can increase the digital I/O providing the option for greater remote operation of the programmer and expanding the 2704 logic capability:

• 20 logic inputs
• 20 relay outputs

Setpoint Programmer

• Ideal for atmosphere or vacuum furnaces and environmental chambers
• 60 programs
• 3 profiled setpoints/program
• 600 segments
• 16 event outputs
• program mimic display

60 setpoint programs, each with 16 digital events can be stored. A total of up to 600 segments can be programmed, and holdback, wait functions and digital inputs offer an extremely flexible solution for applications such as carburizing and vacuum furnaces, environmental chambers and autoclaves.

Digital communications

• Modbus RTU
• Ethernet Modbus/TCP
• Profibus DP
• Devicenet® network communications
• EI-Bisync
• Master Modbus

The 2704 supports two slave communication ports.  Its modular build provides the user with a selection of communication protocols enabling easy integration into both PLC and PC supervisory systems.

Master Modbus communications significantly increase the applications open to the 2704.  In its simplest form it can be used to retransmit a setpoint to a number of slave controllers in a multi-zone furnace.  Alternatively it can be integrated with the Mini8 16 loop controller to provide a remote operator interface with setpoint programmer functions.