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Tests the first stage regulator for proper function and pressure before connecting the second stage.
Details the procedure for adjusting the ALPHA 8 second stage regulator for optimal performance and opening effort.
Tests the first stage regulator for proper function and pressure before connecting the second stage.
Details the procedure for adjusting the ALPHA 8 second stage regulator for optimal performance and opening effort.
The provided document is a service guide for the Oceanic Alpha 8 Second Stage regulator, outlining its function, usage, and maintenance procedures. This regulator is a crucial component of a scuba diving system, responsible for delivering breathable air to the diver at ambient pressure.
The Oceanic Alpha 8 Second Stage regulator is designed to reduce the intermediate pressure from the first stage regulator to a breathable pressure, matching the surrounding water pressure, and deliver it to the diver on demand. It operates on a balanced downstream valve design, which ensures consistent airflow regardless of tank pressure. When the diver inhales, the diaphragm inside the second stage flexes inward, pushing on a lever arm. This lever arm, in turn, opens a poppet valve, allowing air from the first stage to flow into the mouthpiece. When the diver exhales, the pressure inside the second stage increases, causing the diaphragm to return to its resting position, which closes the poppet valve and allows exhaled air to exit through the exhaust valve. The design prioritizes ease of breathing and reliability, making it suitable for various diving conditions. Key components like the orifice, poppet seat, and lever arm work in concert to precisely control the airflow and ensure optimal performance. The regulator is also equipped with a purge button, which allows the diver to manually clear water from the second stage or to provide a continuous flow of air for specific tasks. The overall construction is robust, designed to withstand the harsh marine environment and provide a dependable air supply.
The Alpha 8 Second Stage is designed for straightforward use by divers. It connects to the low-pressure hose from the first stage regulator, typically via a threaded coupling. The mouthpiece, made of a supple material, is designed to fit comfortably in the diver's mouth, accommodating the natural overbite of the human jaw for extended periods of use. The purge button, usually located on the front cover, is easily accessible and allows for quick clearing of water or for providing a steady stream of air. The regulator's design aims for minimal inhalation resistance, ensuring that breathing underwater feels as natural as possible. This is achieved through careful calibration of the internal components, such as the lever arm height and orifice adjustment, which are critical for setting the opening effort. Divers can expect a smooth and consistent airflow, which is essential for comfort and safety during a dive. The regulator's ability to maintain a stable breathing effort across different depths and tank pressures contributes to a more relaxed and enjoyable diving experience. Its robust construction means it can endure the rigors of regular diving, from recreational to more demanding scenarios.
Maintaining the Oceanic Alpha 8 Second Stage is essential for its longevity and safe operation, and the service guide provides detailed procedures for this purpose. Regular maintenance involves a thorough disassembly, inspection, cleaning, and reassembly of all components. Key parts like O-rings, the poppet seat, and washers are typically replaced during service to ensure optimal sealing and performance. The guide emphasizes the importance of inspecting components for wear, corrosion, tears, or distortion, and discarding any damaged parts. For instance, the diaphragm, exhaust valve, and mouthpiece are checked for suppleness and integrity. The orifice, a critical component for airflow control, is carefully inspected for scoring or nicks, as even minor imperfections can affect performance.
Cleaning procedures are crucial, with specific instructions for cleaning internal threads and other components. Lubrication with Oceanic-approved halocarbon-based lubricant is applied to various parts during reassembly to ensure smooth operation and prevent wear. Torque specifications are provided for critical connections, such as the inlet coupling and LP hose, to ensure proper sealing and prevent leaks.
A significant aspect of maintenance is the "Final Tuning and Testing" section. This involves pressurizing the regulator and adjusting the orifice to achieve the correct "opening effort" – the force required to initiate airflow. This adjustment is critical for ensuring easy and natural breathing. The guide details how to use specialized tools, such as an in-line adjustment tool and a poppet tool, for precise tuning. It also includes steps for checking for air leaks and ensuring smooth movement of the lever arm. The troubleshooting section aids technicians in diagnosing common issues like freeflow, excessive inhalation resistance, or water entry, and provides corresponding treatments, often involving replacement of specific parts or readjustment. The emphasis on using only genuine Oceanic parts during service is highlighted as a safety measure. After service, the mouthpiece is cleaned and disinfected before the regulator is returned to the customer, ensuring hygiene. These comprehensive maintenance procedures are designed to restore the regulator to its factory specifications, ensuring reliable and safe performance for the diver.
General| Display | LCD |
|---|---|
| User Replaceable Battery | Yes |
| Air Integration | No |
| Battery Life | 300 dive hours |
| Algorithm | Pelagic DSAT |
| Gas Mixes | Single |
| Modes | Air, Nitrox, Gauge |
| Nitrox Compatible | Yes |
| Battery Type | CR2450 |
