Given the importance of the control indicating equipment in fire-prevention systems operating using oxygen-depletion methodologies, it is regulated by specific requirements that impose a series of characteristics associated with self-diagnostics and redundancy, and with a dual power supply to guarantee operation of the system for at least 24 hours (according to the standard to be followed), even where the primary electricity supply is absent.
The N2 ORS® control panel is certified SIL-3 according to the general requirement IEC 61508.
On the basis of such detailed specifications, we have developed a highly reliable measurement instrument. Each of our systems is in fact equipped with three individual sensors, supported by reciprocal measurement diagnostics with a triplicated architecture with majority redundancy. This means that the values measured are processed using a 2oo3 (two-out-of-three) voting design, thus providing a precise and unequivocal value and a high level of safety, as can be seen from the fact that even our oxygen sensors are IEC 61508:2010 certified with the significant reliability level of SIL-3.
In the N2 ORS® system, the interoperability of the equipment (connection between the control panel, sensors, generators, valves, warning devices, etc.) is provided through protocol-based data exchange. This requires particular attention during the design phase to verify the transmission parameters, in order to avoid possible reflections, interference and random failures. The system is based on a dual closed-loop connection. The routing of the cables is designed in such a way that only a single part of the loop can be damaged: indeed, for each of the two branches in a single loop, the routing of the cables is differentiated from the routing of the other branch. This means that any damage to one of the two branches does not affect the other.
The power supply is also made up of a dual-loop connection. The operating principle is identical to the system used for data transmission. Furthermore, the power supply system has two sources: the primary power supply from the public mains network and the back-up supply provided by power packs. If the primary power supply is not available, the back-up supply starts up automatically. When the primary supply is once again available, it automatically takes over from the back-up system.
The system synoptics operate via web with an IP address and transform the data from the control panel into intuitive graphics that be read immediately.
The specific operating conditions of the system (normal condition, fault condition, alarm condition, etc.), including the corresponding switching operations, will be recorded and saved so that they can be displayed.
The synoptic makes it possible to:
• display events originating from the control panel
• verify that the entire system is operating correctly
• display any alerts and alarms
• query operating types