Control
and Detection system

Isolcell introduces innovative technologies
exclusively developed for ORS

CONTROL INDICATING EQUIPMENT (CIE) N2 ORS®

The heart of the system

The N2 ORS® control indicating equipment is the unit that manages the entire system. The panel manages sampling from the virtual grid, ordering the activation and/or deactivation of the integrated and interfaced equipment making up the system, according to scheduled intervention plans. It also manages all control systems to avoid the undesired formation of under-oxygenated atmospheres (compared to atmospheric values) in environments adjacent to the areas to be protected, along with shut-off procedures when the pre-set oxygen concentration thresholds are reached, and activation of alarms when needed.
control unit SIL-3

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.

OXYGEN SENSORS N2 ORS®

Oxygen analysis for small and large environments

The oxygen content in the protected area is measured, based on the reference standards, using the Isolcell N2 ORS® variable-step virtual grid. Analysis ensures that a possible failure in an individual measurement element does not influence the results of the overall measurement operations. Indeed, the most recent reference standard (ISO 20338:2019, which in this case differs, for example, from the European standard EN 16750:2017) states that the oxygen concentration must be measured continuously by each detector, at least once a minute, and that the response times must be documented. Furthermore, it should be noted that the entire system remains operational while at least one sensor remains functional, namely 20% of sensors.

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.

optical oxygen sensor
oxygen sensors optical technology and zirconium technology

ELECTRICAL SYSTEM AND SUPPLY

High redundancy features

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.

safety integrity level SIL IEC 61508 how it works

WEBSERVER N2 ORS®

Oxygen reduction system remote control

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

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