2oo3 Modular Redundant Control System 2oo3 voting system for both the energising and de-energising signals The MRCS removes the need to rely on just one solenoid valve to open or close the process valve. Compatiable with all hazardous area solenoids.

Actual product may differ from above image. Product details should be verified before purchase.

Compact manifold designs
Interchangeable CNOMO interface coil units, including various hazardous area options
Solenoid Operator: SIL 2 on energising, SIL 3 on de-energising
ATEX, IECEx and CCCEx coil certification
Individual pneumatic visual indication for each solenoid as well as for the input to and output from the whole system. This allows for visual verification that the whole assembly is working as required and full visual diagnostic of the manifold to identify which solenoid requires maintenance, should a fault ever occur.
Individual solenoid isolation. This allows any single solenoid to be isolated for service/replacement while the other solenoids can continue to operate normally, which means that the solenoids can be maintained without taking the whole manifold system out of service.

For more information on the product features and benefits, please watch the video below by following the link:

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2OO3 & 3OO4 MRCS

Compact pneumatic solenoid valve manifold systems designed for use in applications where very high reliability and availability is required. These manifolds embed a “two out of three” (2oo3) or “three out of four” (3oo4) voting system for both the energising and de-energising signals. Manifold material available in Aluminium or 316 Stainless Steel.

Also known as Redundant Valve Manifold (RVM).

MATERIAL SPECIFICATIONS

	STANDARD
Body and End Caps	Black Anodised 6082 T6 Aluminium
Spool	Hard Anodised Aluminium PTFE Impregnated
Spacers	Glass Filled Acetal
Seals	Nitrile (Alternative Seals Available)
Spring	High Tensile Carbon Steel
Mounting Screws	Stainless Steel

VALVE SPECIFICATIONS

	STANDARD
Port Connection Size	1/4″ BSP
Working Pressure Internal Pilot Version	3 to 10 bar
Working Pressure External Pilot Version	3 to 10 bar
Minimum External Pilot Pressure	3 bar
Cv Factor	0.062 / 0.5
Flow Rate (6 bar inlet pressure, 1 bar pressure drop)	62 / 500 l/min
Maximum Ambient Temperature	+80°C
Minimum Working Temperature	-20°C

Series Overview ❯

2oo3 Modular Redundant Control System

Product Overview

The ROSS Pneumatrol 2oo3 Modular Redundant Control System is a safety-critical pneumatic control solution designed to provide reliable voting logic for process shutdown and control applications.

The system uses a Two Out of Three (2oo3) architecture, requiring agreement from two independent channels before a control action is initiated. This approach improves fault tolerance while reducing the risk of unwanted shutdowns caused by a single device fault.

Manufacturer: ROSS Pneumatrol
Product Type: Modular Redundant Control System
Voting Logic: 2oo3 (Two Out of Three)
Application: Safety Instrumented Systems (SIS) and Process Safety Applications

What is 2oo3 Voting?

A 2oo3 system uses three independent control channels to monitor a process condition.

For a control action to occur:

Two of the three channels must agree
A single fault can be tolerated without loss of functionality
The risk of spurious trips is significantly reduced
System availability can be improved whilst maintaining safety integrity

This voting philosophy is widely used in safety-critical applications where both reliability and operational continuity are essential.

Key Features

Modular redundant control architecture
Two Out of Three (2oo3) voting logic
Suitable for energising and de-energising safety functions
Fault tolerant system design
Supports increased operational availability
Helps minimise nuisance shutdowns
Designed for Safety Instrumented Systems (SIS)
Suitable for critical actuator and valve control applications
Robust industrial construction

Applications

The 2oo3 Modular Redundant Control System is suitable for:

Emergency Shutdown (ESD) systems
Safety Instrumented Systems (SIS)
Safety Instrumented Functions (SIF)
Process shutdown systems
Critical valve automation
Onshore and offshore oil & gas installations
Chemical processing plants
Petrochemical facilities
Power generation systems
Energy infrastructure

Product Benefits

Improved Safety Integrity

Multiple voting channels provide enhanced confidence that shutdown actions occur only when genuinely required.

Fault Tolerant Operation

The architecture allows the system to continue operating safely even if a single channel develops a fault.

Reduced Nuisance Trips

By requiring agreement from two independent channels, the risk of unnecessary process shutdowns can be significantly reduced.

Enhanced Process Availability

Improved fault tolerance helps maximise uptime whilst maintaining compliance with process safety requirements.

Modular Design

The modular construction simplifies maintenance, inspection and future system expansion while supporting standardisation across safety systems.

Typical Process Safety Applications

The 2oo3 voting system is commonly used in:

High Integrity Pressure Protection Systems (HIPPS)
Emergency shutdown valve systems
Burner management systems
Pipeline isolation systems
Critical process control loops
Hazardous area automation systems
Process plant safety systems

Industries Served

Oil & Gas
Petrochemical Processing
Chemical Manufacturing
Energy & Utilities
Power Generation
Hydrogen Production Facilities
Offshore Installations
Process Industry

Why Choose ROSS Pneumatrol?

ROSS Pneumatrol has extensive experience supplying engineered pneumatic and safety-related solutions to some of the world's most demanding industrial sectors. Our process safety solutions are developed to help operators achieve enhanced reliability, improved availability and compliance with modern functional safety philosophies.

Through innovative pneumatic control design and decades of industry expertise, ROSS Pneumatrol supports customers operating within safety-critical environments worldwide.

Important Notes

Voting architecture should be selected as part of an overall functional safety assessment.
System suitability should be evaluated against SIL requirements and process risk assessments.
Installation and maintenance should be carried out in accordance with relevant industry standards and safety procedures.
Final system performance is dependent upon the complete Safety Instrumented System design.

Download and Further Information

View the product page here:

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