EUROTHERM has released a range of plug-in I/O modules for its 2704 triple loop controller. The modules allow higher I/O densities.
The 2704 and the seven software selectable digital I/O, one relay output, and two analogue inputs can be fitted with up to five plug and play I/O modules. Two communications modules and an external I/O expander can also be fitted, providing for up to 20 digital inputs and 20 relay outputs.
New modules added to the range include a dual analogue input and dual analogue output module, providing for up to eight direct analogue inputs or outputs. The dual output module can be configured as an isolated 24Vdc transmitter power supply. For high accuracy applications, the high-resolution output module offers up to 15bit output accuracy, plus a transmitter power supply second channel. The dual input module is suited to zirconia probe interfacing. The 2704 also offers a zirconia function block for simple configuration to any standard zirconia probe.
For boiler applications the total dissolved solids module and firmware function block offer a direct boiler probe interface. Conductivity measurement is provided with all standard compensation factors provided for as well as blowdown. Boiler efficiency can be increased by correctly controlling the contaminates in the steam system.