rEvo III CCR Rebreather: technical review of the rebreather

The rEvo III is a highly regarded closed-cycle rebreather (CCR), known for its innovative design, robust construction, and outstanding performance characteristics. In this article, technical diving instructor Valters Preimanis will delve into its technical specifications, explore the rebreather's operating principles, and compare it to other CCR models available on the market.

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Table of Contents

Design and construction

The rEvo III stands out with its modular and compact design. Its body is made of durable titanium or stainless steel, ensuring resistance to corrosion and mechanical damage. Rebreather is available in three sizes – Micro, Mini and Standard – to accommodate different body sizes and diving conditions. All sizes use identical internal components, differing only in the external size and therefore the volume of the contour tube.

Micro: Designed for smaller divers or those who prefer lighter equipment.
Mini: A mid-sized model that offers a balance between size and contour volume.
Standard: The largest model, suitable for larger divers or those using a thick wetsuit.

Gas flow path and scrubbers

The rEvo III uses a unique gas flow path that ensures efficient CO2 absorption and optimal breathing performance. Exhaled gas enters the expiratory contour window, where gas analysis and oxygen addition occur. The gas then passes through two scrubbers in series, where CO2 is absorbed. This dual scrubber system provides additional safety and extends scrubber operating time.

The scrubbers are made of high quality Sofnolime or any other compatible absorbent. Their replacement is simple and quick. The rEvo III uses a dual scrubber system, which significantly increases the efficiency and safety of CO2 absorption.

Electronics and sensors

The rEvo III is equipped with an advanced electronics system that includes five oxygen sensors, temperature sensors and a Rebreather Monitoring System (RMS). The RMS constantly monitors the condition of the scrubber and provides the diver with real-time information on the remaining operating time. This system significantly improves diving safety by eliminating the risk of CO2 poisoning.

The rEvo III uses a modular electronics system that allows for easy maintenance and repair. The oxygen sensors are positioned to provide accurate and reliable readings.

Contour lungs and respiratory system

The rEvo III uses a rear-mounted contoured lung for a comfortable and hydrodynamic dive. The breathing system is designed to reduce breathing resistance and ensure a smooth gas flow.

Manual gas injection and ADV

The rEvo III is equipped with a manual gas injection system that allows the diver to add oxygen or diluent as needed. The rebreather is also equipped with an Automatic Diluent Valve (ADV) that automatically maintains optimal gas pressure in the contour windows.

Safety features

The rEvo III is equipped with several safety features, which include:

Double scrubber system: Provides additional safety and extends the life of the scrubber.
Rebreather Monitoring System (RMS): Constantly monitors the condition of the scrubber and provides real-time information to the diver.
Manual gas injection system: Allows the diver to add gas if necessary.
Automatic Diluent Valve (ADV): Automatically maintains optimal gas pressure.
Five oxygen sensors: Provides accurate and reliable readings.

Comparison with other CCR models

The rEvo III stands out from other CCR models on the market with its innovative design, robust construction and outstanding performance features. Its dual scrubber system, RMS system and manual gas injection system provide additional safety and convenience for the diver. The rEvo III is suitable for both beginners and experienced CCR divers.

Overall about rEvo III

The rEvo III is a highly technological and reliable closed-cycle rebreather that offers excellent performance and safety. Its innovative design, robust construction and advanced features make it the ideal choice for divers who want to experience the benefits of CCR diving.

Comparison of rEvo III with other CCR rebreathers

In this section, we will compare the rEvo III to other popular closed-cycle rebreathers (CCRs) – the Poseidon SE7EN+, Scuba Force SF2 and Dive Rite O2ptima. Each of these rebreathers has its own unique features and benefits, so it is important to understand the differences in order to choose the model that is right for you.

rEvo III

Design: Modular, compact, available in three sizes (Micro, Mini, Standard).
Scrubbers: Two, serial, efficient CO2 absorption.
Electronics: Five oxygen sensors, RMS system, modular electronics.
Contour lines: Rear mounted, comfortable diving.
Gas injection: Manual, ADV valve.
Safety: Double scrubber system, RMS, manual gas injection, ADV.
Suitable for: For both beginners and experienced CCR divers.

Poseidon SE7EN+

Design: Compact, lightweight, ergonomic.
Scrubbers: One, big, long-lasting.
Electronics: Intuitive, user-friendly, automatic control.
Contour lines: Rear mounted, optimal gas flow.
Gas injection: Automatic or manual, depending on your choice.
Safety: Multiple built-in safety features, automatic control.
Suitable for: For beginners and experienced divers looking for a comfortable and easy-to-use rebreather.

Scuba Force SF2

Design: Compact, one-piece carbon fiber body.
Scrubbers: One, integrated, optimal size.
Electronics: Simple, reliable, easy to maintain.
Contour lines: Integrated into the body, hydrodynamic design.
Gas injection: Manual.
Safety: Durable housing, simple design, less risk of errors.
Suitable for: For technical divers looking for a durable and reliable rebreather.

Dive Rite O2ptima

Design: Compact, suitable for mounting on the chest.
Scrubbers: One, replaceable, easy to replace.
Electronics: Fully electronically controlled, multifunctional display.
Contour lines: Chest mountable, optimal balance.
Gas injection: Automatic or manual.
Safety: Multiple safety features, suitable for various types of diving.
Suitable for: For divers who prefer a chest mount and a versatile rebreather.

Conclusion

Each rebreather choice depends on the diver's individual needs and preferences. The rEvo III stands out with its dual scrubber system and RMS for added safety. The Poseidon SE7EN+ is easy to use and suitable for beginners. The Scuba Force SF2 is a durable and reliable rebreather for technical divers. The Dive Rite O2ptima is a versatile chest-mounted model.

Before making a choice, it is important to carefully study the specifications of each rebreather, try them out in practice, and consult with experienced divers.