The monitoring system is wired to normally open or closed contacts in the system that closes or opens when an event or alarm happens. A contact is an electrically operated device that automatically operates when an event occurs. As an example; when a low fuel level switch installed in a fuel tank detects a low fuel condition, the switch closes, to create an alarm. As soon as the switch closes the wire connected to the other side of the low fuel level switch completes a path back to the RTU monitoring device.
As soon as the monitoring device sees the input signal it sends the message programmed to that input, which in this case would be low fuel level. When an event or alarm happens, the RTU picks up the signal, makes contact with the system server through a variety of available communications means such as, serial links, leased-lines, dialup, or via TCP/IP using IP-to-Ethernet device servers or numerous types of private radio and 3G cellular modems. The server, or embedded application which has been programmed to send a message to recipient’s based on the individual input it received, sends the message.
Messages are sent
to the recipient’s pager, PDA and or cell phone as well as an e-mail message to the recipient’s e-mail address.
HOW IT WORKS - ALL SYSTEMS NORMAL SIMULATION
Our system is an active device, looking for an event or status change. In the above presentation "All Systems Normal" reflects monitored equipment in its normal operating state. The Facility Load Panel is being power by utility power through the ATS. The RTU is standing by for an
event or alarm to take place. No events or alarms means All Systems Are Normal. In the following page we simulate a utility power failure and display the events or alarms that are associated with that failure.
