AT 400 Pro

SPECIAL OFFER Receive a new Roller Duffel Bag ABSOLUTELY FREE! With the purchase of a qualifying life-support package from a participating Authorized AERIS Dealer. Find out more

Pneumatically balanced, user-adjustable second stage. This pneumatically balanced, adjustable second stage is sure to provide you the highest performance for many years. The pneumatically balanced second stage provides the lowest possible inhalation effort. The second stage adjustment allows you to adjust your breathing effort, fine-tuning the regulator to your desired setting throughout your dive.

The venturi assist deflector vane directs airflow from the valve directly to the mouthpiece producing a smooth "venturi assisted" inhalation. Turning the venturi assist down, to a pre-dive position, prevents regulator free-flow while on the surface.

• Pneumatically balanced

• Diver-adjustable inhalation effort

• Adjustable venturi switch

• Nitrox compatible to 40%

• Paired with your choice of the new AT400 Over-Balanced Diaphragm First Stage featuring DVT (Dry Valve Technology)

AT400 First Stage
High performance over-balanced diaphragm first stage with environmental seal and the added protection of DVT (Dry Valve Technology).

• 4 LP ports, 2 HP ports for maximum hose placement

• DVT eliminates corrosion of critical internal components, bacteria, hose deterioration, and damaged gauges and computers.

• Nitrox compatible to 40%

NEW! AERIS ADVANTAGE LIMITED LIFETIME REGULATOR PARTS REPLACEMENT PROGRAM
The AERIS ADVANTAGE Program provides free standard replacement parts for your AERIS regulator. The program includes all AERIS first stages and second stages. Register your regulator online with AERIS, and you are automatically enrolled in the program. There is no additional charge for this program. Register today!

FEATURES

DVT (Dry Valve Technology)
A patented design that puts an end to flooded regulators without sacrificing performance! DVT is a revolutionary regulator technology designed to automatically prevent moisture and contaminants from entering your first stage, even if the dust cap is left off. Find out more

Pneumatically balanced valve design
A common objection to typical adjustable second stages is that divers can't imagine themselves twisting and turning a knob as they descend and ascend through the depths. If inhalation resistance is set near zero at depth, your ascent would require you to manually increase resistance as ambient water pressure is reduced to prevent free-flow. Taking another stride beyond common second stage engineering, the AT400 Pro features a pneumatically balanced valve that maintains a preferred breathing resistance throughout the dive. Set it once and the AT400 Pro automatically adjusts to make breathing as easy at 100 feet as it is at 30 feet - with no additional manual adjustment.

Diver adjustable inhalation effort
Most downstream demand valve regulators are calibrated during manufacturing to a single, 'middle of the road' operation. Whether finning up current at 100+ feet or merely snorkeling out to the dive site, this factory adjustment may not be optimum for the wide variety of demands we place on our equipment. A simple twist of the AT400 Pro's adjustment knob enables complete control...set the inhalation requirement to near zero when you need ultimate performance, or tune it for greater resistance as conditions or preferences change.

Adjustable venturi switch
The adjustable deflector vane found in the AT400 Pro diverts airflow from the valve directly to the mouthpiece, producing smooth venturi-assisted inhalation. With the addition of a user-adjustable venturi system, full adjustment control rests in the hands of the diver.

Computer optimized design
AERIS regulators are exclusively designed using the latest 3-D computer modeling techniques. This allows us the ability to model and test performance while still in the early stages of development. The AT400 Pro's unique deflector vane and housing design diverts airflow from the valve directly to the mouthpiece, producing smooth venturi-assisted inhalation.

Lightweight
The AT400 Pro's housing is made from an ABS/Polycarbonate composite blend of materials making the AT400 Pro both extremely rugged and lightweight (5.4 ounces) and nearly neutrally buoyant underwater, reducing jaw fatigue on extended dives. The extremely ligweight cover ring is machined from a solid piece of aircraft aluminum, and then hard anodized, utilizing a unique process to prevent corrosion.

Patented orthodontic mouthpiece
To further reduce jaw fatigue, the AT400 Pro features a patented Orthodontic Mouthpiece, designed to accommodate the natural overbite of the human jaw.

Nitrox Compatibility
The AT400 Pro is classified as being suitable for use with nitrox breathing gas mixtures containing up to 40% oxygen by volume without the need for special preparation, cleaning or component parts.

SPECS

STANDARD DOWNSTREAM DEMAND VALVE
Did you know that it costs energy to breathe? The amount of energy your regulator requires to move each liter of air is called work of breathing (WOB). Lower work of breathing equals lower effort required to breathe and increased comfort and safety during a dive.

(A) The spring force must be greater than the downstream air pressure to close the valve.

(B) The diver must overcome this spring force to open the valve.

(A) The spring force must be just enough to overcome the difference between downstream air pressure and upstream balance chamber pressure.

(B) The downstream air travels through a hole in the poppet into the balance chamber and applies an "upstream" force just slightly less than the downstream force.

(C) The size and force of the spring is considerably less than that used in a standard demand valve, leading to less effort required by the diver to open the valve and initiate air flow.

click for larger view

WORK OF BREATHING
Did you know that it costs energy to breathe? The amount of energy your regulator requires to move each liter of air is called work of breathing (WOB). Lower work of breathing equals lower effort required to breathe and increased comfort and safety during a dive.

How to Read Work of Breathing Charts
The computer-generated breathing machine chart presented above represents a regulator's performance per standards established by the U.S. Navy's Experimental Diving Unit. Tests are conducted at 198 feet with approximately 3000-psi supply pressure, 25 breaths per minute of 2.5 liters each.

(1) Inhalation - The chart shows one complete breath cycle, starting with inhalation on the left and continuing along the bottom to the right, staying mostly below 0.0; thus the inhalation work of breathing is reported in negative numbers.

(2) Exhalation - The exhalation effort begins on the right and runs across the top to the left. These are all positive numbers since a diver (or the machine in this case) is blowing out (exhaling) rather than inhaling.

(3) WOB - The total area inside the loop formed by the two lines is what the computer analyzes to calculate the regulator's total work of breathing - the amount of energy the regulator requires to move each liter of air.

*Column Inches of Water

COMPARE

NOTE: The document listed below is for reference only. For specific operational details, consult the original paper documents included with your Regulator.

Regulator Comparison Chart.pdf