TDI Dräger Ray SCR Diver
Enter rebreather diving, extend bottom time, and operate with precision using the Dräger Ray semi-closed system
Duration
3 days, 4 dives
Max Depth
Limited by PO₂ (max 1.6 ATA) and gas selection
Level
Technical (Rebreather Entry – SCR)
Next Step
Advanced SCR / CCR Diver
Overview
The TDI Dräger Ray SCR Diver course introduces divers to semi-closed circuit rebreather (SCR) diving using the Dräger Ray unit.
The Ray is a compact SCR system designed around fixed mass flow rates and nitrox mixtures, allowing divers to recycle breathing gas and extend dive duration while reducing gas consumption.
Training focuses on unit-specific operation, gas selection, flow rate management, and failure response, where precision and discipline are essential. Divers learn to manage a life-support system that requires continuous awareness and immediate corrective action.
At N9BO℠, this course is delivered as systems-based training, developing control, redundancy awareness, and structured problem-solving under operational conditions.
Course Facts
- Course name: TDI Dräger Ray SCR Diver
- Level: Technical rebreather (entry-level SCR)
- Minimum prerequisites: Minimum age 18 (15 with consent), TDI Nitrox Diver (or equivalent)
- Ratio: Maximum of 6 students per instructor (small groups recommended for quality training)
- Configuration: Dräger Ray SCR with bailout open circuit system
- Depth / environment: Maximum depth 40 metres / 130 feet, without decompression, and limited by a maximum PO₂ of 1.6 ATA and gas selection
- Format: Academic development + unit workshop + confined water + open water dives
- Duration: Typically completed in 3 days (Minimum 4 open water dives with at least 100 minutes accumulated bottom time)
What You’ll Learn
- Assemble and configure the Dräger Ray SCR.
- Pack and manage scrubber material.
- Monitor PO₂ indirectly through system management.
- Execute bailout procedures to open circuit.
- Respond to failures including flooding, gas issues, and system faults.
Prerequisites
- Be at least 18 years old (15 with parental consent).
- Hold TDI Nitrox Diver certification (or equivalent).
- Be medically fit for diving.
FAQ
The Dräger Ray is a semi-closed rebreather (SCR) using preset flow rates and nitrox mixtures to maintain a breathable gas mix while recycling part of the breathing gas.
Depth is not fixed — it is limited by:
- Gas mixture used
- Maximum PO₂ (1.6 ATA)
- Manufacturer recommendations
The Ray is a simpler, more compact SCR system, with fewer flow options, making it ideal as an entry-level rebreather platform.
- Hypoxia / hyperoxia
- Incorrect flow rate selection
- CO₂ buildup from scrubber failure
- Loop flooding
Upon successful completion of this course, you may engage in no decompression diving activities utilising the unit-specific semi-closed-circuit rebreather to a maximum depth of 40 Metres/130 Feet, without decompression, utilising nitrox mixes not exceeding your level of certification.
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Advance into rebreather instruction and train divers to operate life-support systems safely and effectively using SCR platforms.
