EUROTHERM's model 394 10" circular recorder is a step forward in circular chart recording. Using Chessell's successful printhead technology, the 394 can trace up to six inputs in four colours with full chart annotation.
Advanced math capabilities, case-mounted PID controllers are among the features that make the 394 one of the most versatile and powerful circular chart recorders on the market.
Use of the latest in application specific integrated circuit (ASIC) and surface mount technologies, gives the 394 input circuitry high accuracy and stability.
Inputs are fully universal accepting signals from thermocouples, resistance thermometers, potentiometers and digital sources, as well as linear dc voltage and current sources. Charts are available in 12-hour, 24-hour daily or weekly charts, with various division options.
The use of a multi-point printhead provides the 394 with the ability to print text on the chart including channel values, time, date, scales, channel descriptors and totaliser values as well as messages, allowing blank charts to be developed into useable documents providing simply to read information.
The 394 display consists of a 20-character vacuum fluorescent display and alarm indicators allowing the recorder to be fully configurable from the front panel using push-button keys to follow a series of text prompts at the display.
Access to most functions can be password protected as a part of the configuration process. The recorder can also be configured from a PC-based package, allowing the user to set up the configuration off-site for later downloading to the recorder. Up to four alarms are available per channel for alarming or event activation.
The communications option uses the MODBUS RTU protocol to ensure compatibility with standard SCADA software and other types of industrial equipment such as PLCs, the 394 acts as a slave device. The RS485 specification allows multiple instruments on a single communications link.
Using the computer industry standard type 1 SRAM PC-card, the recorder's configuration can be stored for transfer to another recorder or to a PC for manipulation using the PC configuration tool.
Process data can also be stored on the PC-card in a format readable by standard spreadsheet packages, or, alternatively in a compressed format that can be used with the Eurotherm Review Software, a Windows-based package for viewing and printing charts.
Data can also be exported to programs such as Excel for further data processing. The data can also be utilised to automatically generate batch reports or custom reports using an Excel add-in called Report 5000.
Maths, timers, counters and totalisers, options provide the recorder with integrating and counting facilities, and the ability to carry out calculations ranging from simple arithmetic functions (e.g. subtracting one channel's value from another) to complex application specific functions such as Mass Flow calculations.
Other outputs options include fitting up to 18 relay outputs can be fitted, driven by any internal recorder event such as channel alarm, totaliser overflow, totaliser output, etc.
Two independent controllers can be case mounted to provide PID control of related process variables.
Up to four of the input or maths channels can be output as a linearised current or voltage signal and up to six current loops can be powered by a built-in 25V dc power supply unit which is suitable for most loops. Event inputs allow for starting and stopping functions as well as providing interaction with maths channels.
The 394 is powered by a universal 90 to 264V ac supply or wide ranging 20 to 53V ac/dc supply, allowing the 394 to be utilised for any power supply in the world and is designed for operation up to 50°C.
With an IP65 rated waterproof front sealing, the 394 is ideal for wet areas and can be hosed down, making it suitable for dairies and other wet environments.