• Libratherm Instruments Private Limited

Microcontroller Based Manual Loader

The Microcontroller Based Manual Loader is designed to generate stable and accurate 4-20mA dc current signal, which can be fed to the 4-20mA operated load or actuator such as motorized valve, I/P converter, etc. Unlike simple current source meter, the source output 4-20mA is also taken internally as the input feedback to ensure the external loop continuity of the signal, which is being fed to the load. In case, the external 4-20mA loop is open, the fault message is indicated on the display, which ensures that the signal is actually being fed or not fed to the load. The 4-20mA signal is of 12-bit resolution, and is fed to the external device in the range of 0.0 to 100.0 %. The smallest change in the output is 0.01% or 16uA. Both the set value and the feedback values are simultaneously displayed on the 4 digit red LED display. The serial communication in the form RS485, having MODBUS RTU protocol is also provided for to SCADA or DCS. The protocol, allows configuration of digital ID of each such DCS-723 and monitoring of source and set parameters. DCS-723 works on 230VAC and is protected against industrial RFI/EMI interference by suitable filter.