SCUBAPRO MK11 DIN 300/C370 Diving Regulator System User Manual

1. Introduction

This manual provides essential information for the proper use, setup, operation, and maintenance of your SCUBAPRO MK11 DIN 300/C370 Diving Regulator System. This system is designed for reliable air delivery during diving activities, combining the compact MK11 balanced diaphragm first stage with the C370 second stage.

Image 1.1: The SCUBAPRO MK11 DIN 300 First Stage (left) and C370 Second Stage (right) Diving Regulator System. The first stage connects to the tank valve, and the second stage delivers air to the diver.

2. Setup and Assembly

Proper assembly of your regulator system is crucial for safe diving. Follow these steps carefully:

1. Inspect Components: Before each dive, visually inspect all components of the MK11 first stage and C370 second stage for any signs of damage, wear, or contamination. Ensure all O-rings are present and in good condition.
2. Connect First Stage to Tank: The MK11 first stage features a DIN 300 connector. Ensure the tank valve is clean. Screw the DIN connector firmly into the tank valve by hand until snug. Do not overtighten.
3. Hose Routing: The MK11 first stage is equipped with two high-pressure (HP) ports, two high-flow low-pressure (LP) ports, and two standard LP ports. Connect your primary second stage (C370), alternate air source, pressure gauge, and BCD inflator hose to the appropriate LP and HP ports. Optimize hose routing for comfort and accessibility.
4. Connect C370 Second Stage: Attach the C370 second stage hose to one of the low-pressure ports on the MK11 first stage. Ensure a secure connection.
5. Pressure Check: Slowly open the tank valve and check for any air leaks. Observe the pressure gauge to ensure it reads correctly.

Important: If you are unsure about any assembly step, consult a certified diving technician or instructor.

3. Operation

The C370 second stage offers user-adjustable controls for optimal breathing performance.

• Inhalation Effort Control Knob: The C370 features an inhalation effort control knob. Turning this knob allows you to fine-tune the breathing resistance. Turn clockwise for increased resistance (useful for preventing free-flow on the surface or during entry) and counter-clockwise for reduced resistance (for easier breathing at depth).
• Dive/Pre-Dive Lever: A small coaxial dive/pre-dive lever is located on the C370. In the "Pre-Dive" position, the regulator is detuned to prevent free-flow before entering the water. In the "Dive" position, the regulator is fully operational for optimal breathing performance underwater. Always switch to "Dive" before descending.
• Purge Button: The large purge button on the front of the C370 is designed for easy activation, even when wearing thick gloves. Pressing this button releases a burst of air to clear water from the second stage.

The MK11 first stage provides constant and effortless airflow, unaffected by depth, tank pressure, or breathing rate, thanks to its balanced diaphragm design and environmentally sealed body.

4. Care and Maintenance

Regular care and maintenance will ensure the longevity and reliable performance of your SCUBAPRO regulator system.

• Rinsing: After each dive, thoroughly rinse the entire regulator system with fresh, clean water. Ensure the dust cap is securely in place on the first stage to prevent water from entering. Operate the purge button several times during rinsing to flush out any salt or debris from the second stage.
• Drying: Allow the regulator to air dry completely in a shaded, well-ventilated area before storage. Avoid direct sunlight.
• Storage: Store the regulator in a cool, dry place, away from direct sunlight, extreme temperatures, and chemicals. Avoid kinking hoses.
• Professional Servicing: Your SCUBAPRO regulator requires periodic professional servicing by an authorized SCUBAPRO technician. Refer to your local SCUBAPRO dealer for recommended service intervals, typically annually or every 100 dives, whichever comes first. The environmentally sealed design of the MK11 first stage helps protect internal components from water and pollutants, but regular inspection and service are still essential.

5. Troubleshooting

This section addresses common issues you might encounter. For any problems not listed or if you are unsure, always consult a certified SCUBAPRO technician.

• Free-Flowing Regulator:
  • Ensure the dive/pre-dive lever is in the "Pre-Dive" position on the surface.
  • Adjust the inhalation effort control knob clockwise to increase resistance.
  • Check for debris in the second stage. Rinse thoroughly.
  • If persistent, professional service is required.
• Hard Breathing:
  • Ensure the dive/pre-dive lever is in the "Dive" position.
  • Adjust the inhalation effort control knob counter-clockwise to decrease resistance.
  • Check for kinks in the hose.
  • If persistent, professional service is required.
• Air Leaks:
  • Check all hose connections for tightness.
  • Inspect O-rings on the first stage DIN connector and hose connections for damage.
  • If a leak persists or is from within the regulator body, discontinue use and seek professional service immediately.

6. Technical Specifications

7. Warranty Information

The SCUBAPRO MK11 DIN 300/C370 Diving Regulator System is backed by a manufacturer's limited lifetime warranty. This warranty covers defects in materials and workmanship under normal use and service. For specific terms, conditions, and to register your product, please refer to the official SCUBAPRO website or contact your authorized SCUBAPRO dealer. Proof of purchase and regular professional servicing may be required for warranty claims.

8. Customer Support

For further assistance, technical support, or to locate an authorized service center, please visit the official SCUBAPRO website or contact their customer service department. You can find more information and contact details on the Scubapro Store on Amazon or the main SCUBAPRO website.

Always ensure that any servicing or repairs are performed by certified SCUBAPRO technicians using genuine SCUBAPRO parts to maintain product integrity and warranty validity.