Monitor from afar & with greater intelligence
BOOLEAN ENGINEERING Pty Ltd – LTD 4 – 20 Large Trending Display of 4 – 20 ma Data Stream allows process systems in large, noisy and poorly lit machine halls to be monitored from afar and with greater intelligence than standard digital meters and status lights.
WHAT IS THE EASYdisplay LTD 4 – 20?
The EASYdisplay device is a 1 metre long strip of 30 individually addressable, full colour LEDs that display the data from a 4 -20 ma current loop in a large format, trending data display mode.
Each unit has a solid-state relay alarm output that is triggered by user set PCB links for high and/or low set points, and device operation and status is echoed via a USB port for remote monitoring and data logging.
If the USB has been connected to a RS232 terminal handler like CoolTerm, then the following status reports will be displayed:
• Confirmation that the LTD 4 – 20 is on and the serial connection is operational. Confirm Model: e.g. LTD 4 – 20 is a 1 metre long display strip with 30 LED density etc.
• Test LEDs for operation at the used colours Red, Green, Blue, White and blank. Read the High and Low user selected set point links
Application Notes: AN59 – EASYdisplay: Standard Operation Mode.
WHERE IS THE EASYdisplay USED?
Process and Industrial control systems generate Trending data, usually displayed by digital meters. The EASYdisplay generates large format (1 metre), intelligent data display (colour and motion) to assess these process variables which can be logged via the USB link.
HOW IS THE EASYdisplay USED?
As each value of the 4 – 20 ma loop current is read it is reported for logging and displayed as follows:
RED for values above the High set point.
• BLUE for values below the Low set point.
• GREEN for values between the High and Low set points.
• WHITE for user selected set points.
Loop integrity is continually tested, and the display will whiteout if the current is less than 4 ma. If High or Low set points are detected, the alarm relay is activated and the LEDs in that zone flash a warning.
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