OMS Airstream Evoque Regulator User manual

OWNER GUIDE
OMS Airstream Evoque
Regulator
Intermediate pressure Ref: 140 psi. +/- 5psi
(Yoke supply pressure: 3500 psi)
(Din supply pressure: 4500 psi)
Inhalation Resistance: 0.8 (Column inches of water)
Flow rate: 30+sCFM (air supply: 3000 psi)
Air flow…. 33 cu. ft. (935 liters/min). @ 1 atmosphere
Recommended lubricant LTI Christo-Lube MCG129

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COPYRIGHT NOTICE©
This owner’s manual is copyrighted(©) OMS 2017. All Rights Reserved. It may not, in whole
or part, be copied, photocopied, reproduced, translated, or reduced to any electronic
medium or machine readable form without prior consent in writing from Ocean Management
Systems (OMS).
Regulator Owner’s Guide, －rev. 2017/04
Warning, Cautions and Notes
Pay special attention to items marked with the warnings, cautions, and notes that are
accompanied by these symbols:
WARNING indicates a procedure or situation that, if not avoided, could result in
serious injury or death to the user.
CAUTION indicates any situation or technique that could cause damage to the
product, and could subsequently result in injury to the user.
NOTE is used to emphasize important points, tips, and reminders.
PRECAUTIONS & WARNING
Before using this regulator, you must have successfully received training and certification in
the technique of SCUBA diving from a recognized certification agency.
Use of SCUBA equipment by uncertified, or untrained persons, is dangerous and can result
in serious injury, or death.
It must not be used by untrained persons who may not have knowledge of the potential risk
and hazards of scuba diving.
This regulator is not configured for commercial use with surface supplied air.
This regulator must be used together with a Submersible Pressure Gauge that measures
and indicates the user’s air supply pressure.
Always pressurize the regulator gradually by opening the cylinder valve SLOWLY.

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DO NOT apply any type of aerosol spray on the regulator. Doing so may cause permanent
damage to certain plastic components, including the regulator second stage housing.
Factory prescribed service for this regulator must be performed at least once annually by a
specially trained and authorized technician who services OMS SCUBA equipment.
DO NOT leave a cylinder standing unsecured with the regulator attached to the
valve.Doing so may cause permanent damage to the regulator and cylinder valve if the
cylinder falls over against the regulator first stage
DO NOT use the regulator first stage as a carrying handle when lifting or transporting the
cylinder.
It must not be used by untrained persons or persons that do not have knowledge of the
potential risk and hazards of SCUBA diving.
As with all underwater life support equipment, improper use or misuse of this product can
cause serious injury or death.
Read and understand this Owner’s Guide completely before diving with this regulator.
If you do not fully understand how to use this regulator, or if you have questions, seek
instruction in its use from your Authorized OMS Dealer before you use this product.
Prior to each dive, inspect and test this regulator for proper operation. If any part does not
function properly, DO NOT USE!
When diving in cold water (below 50℉or 10°C), you must have received training and a
certification in the techniques of cold water diving from a recognized training agency.
STATEMENT FOR REGULATOR EQUIPMENT
COMPATIBILITY AND USE WITH NITROX
WARNING
This section of your owner’s manual contains important information regarding the use of
your equipment with oxygen enriched gases (i.e. Nitrox, etc.) providing the oxygen content
does not exceed 40%.
Do not attempt to use this product with enriched air until you have read and understood this

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section of the manual.
To do otherwise increases your risk of injury or death.
WARNING
The regulator is not intended to be used by untrained persons who may not know the
inherent risks and hazards of SCUBA diving.
Prior to use of the regulator equipment with nitrogen-oxygen (Nitrox) breathing gas mixtures
that contain a higher fraction of oxygen than 22%, the user must have received, or must first
obtain, certification in diving with Nitrox from a recognized training agency
When the breathing mixture contains oxygen content greater than 22 %, you must use a
nitrox demand regulator according to EN 13949
The regulator is not a medical device. It is not intended and must not be used to supply
treatment oxygen in a medical emergency.
When using air with this regulator equipment, the air used must meet EN12021 Annex A
standards. Comply with EN250:2014
Per the European Standard, EN 12021 Annex A, the following applies:
Composition of Air
Table A.1- Composition of natural air
Components
Molar mass M( kg·kmol-1)
Volume (%)
Oxygen (O2)
31,998 8
20,946 6
Nitrogen (N2)
28,013 4
78,084
Argon (Ar)
39,948
0,934
Carbon dioxide (CO2)
44,009 95a
0,031 4
Hydrogen (H2)
2,015 94
50 x 10-6
Neon (Ne)
20,183
1,8 x 10-3
Helium (He)
4,002 6
524 x 10-6
Krypton (Kr)
83,80
114 x 10-6
Xenon (Xe)
131,30
87 x 10-6
a Since 1975 CO2 level has increased.

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The breathable air shall meet the following standards of purity. If not specified otherwise the
contaminants shall be kept to a minimum, but in any event shall not exceed the permissible
exposure level.
The mineral oil content shall be such that the air is without odor of oil.
NOTE: The odor threshold is in the region of 0.3mg/m³.
Compressed breathing air shall have a dew point sufficiently low to prevent condensation
and freezing. Where the apparatus is used and stored at a known temperature the pressure
dew point shall be at least 5 °C below the likely lowest temperature. Where national or state
regulations exist, they shall be observed.
Where the conditions of usage and storage of any compressed air supply is not known the
pressure dew point shall not exceed −11 °C.
Table 2- Water content of high pressure breathing air
Nominal maximum supply pressure
bar
Maximum water content of air at
atmospheric pressure and 20°C
mg m-3
40 to 200
≤50
> 200
≤35
The water content of the air supplied by the compressor for filling 200 bar or 300 bar
cylinders should not exceed 25 mg m-3.
Table 3- Water content for supplied breathing air up to 40 bar
Nominal maximum supply pressure
bar
Maximum water content of air at
atmospheric pressure and 20°C
mg m-3
5
290
10
160
15
110
20
80
25
65
30
55
40
50

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CAUTION
Per EN 250, S.C.U.B.A. shall be equipped with at least thefollowing sub-assemblies:
1. Air Cylinder(s) with cylinder valve(s) and carrying frame.
2. Demand Regulator (first and second stage).
3. Safety Device / pressure gauge.
4. Carrying Systems / body harness
5. Face piece: Mouthpiece assembly or full face mask or diving helmet.
REGULATOR FIRST STAGE
Congratulations – and thank you – for choosing the OMS Airstream Evoque Regulator. Your
new regulator has been designed and manufactured with pride, per the most exacting
standards for quality and performance.
WARNING: Use a clean working place to prepare your first stage properly.
The first stage converts the tank’s high pressure breathing air to an intermediate pressure
of 135~145 psi that can be handled by the second stage regulator to deliver a smooth flow
of breathing air when you inhale. The intermediate pressure air also can be used for
inflation of a BC or dry suit.

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WARNING
DO NOT ATTACH A LOW-PRESSURE HOSE TO A HIGH-PRESSURE PORT (MARKED
HP) OR A HIGH-PRESSURE HOSE TO A LOW-PRESSURE PORT
Balanced Second Stages DESIGNED TO OPERATE AT 135~145 psi.
Low-pressureand high-pressure port thread sizes are different.
Please use the HP HOSE to connect with the high-pressure ports.(Be sure that you only
place a high-pressure accessory or hoses in ports specifically marked with the letters “HP”,
or ”4500 psi / 300bar.), and use the low-pressure hose to connect with the low-pressure
port.
After having determined the type of hose and preferred orientation, remove the port plugs
from first stage regulator by turning them counterclockwise with a 4mm hex key.
Keep the port plugs for possible future use.
Lightly lubricate the hose end threads and O-Ring with Christo-Lube MCG 129 lubricant.
(silicone grease is acceptable only if the regulator is not designated for use with nitrox).
Thread the hose clockwise into the port until secure and thentighten it with an open-end
wrench of the appropriate size, torque of 30 in-lbs.
3/8–24TP
LP HOSE
7/16–20TP
HP HOSE

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Second stage：Hose male thread (3/8-24) female thread (9/16-18)
Low pressure inflator：Hose male thread (3/8-24)
Diving gauge：male thread (7/16-20)
After all hoses are connected, test the complete regulator assembly by attaching it to a
SCUBA cylinder.
REGULATOR ATTACHMENT TO A TANK
WARNING
Yoke style: Maximum working pressure 3500 psi / 232 BAR
Din style: Maximum working pressure 4500 psi / 300 BAR
Before attaching the regulator to the tank, slowly open, then close the tank valve for a
second, to allow a momentary flow of breathing gas to blow any moisture or contaminants
from the breathing gas opening in the tank valve.
Examine the sealing O-Ring located on the tank valve to ensure that it is not cut, scrubbed,
or deteriorated.
Replace the O-Ring if it is damaged. (FOR YOKE STYLE)

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Examine the threads in the valve to ensure they are clean and free of burrs or defects that
could damage the threads of your regulator DIN fitting. Examine the sealing O-Ring (As568-
111, N90) located on the DIN first stage to ensure that it is not cut, scrubbed, or
deteriorated. (FOR DIN STYLE)
TO ATTACH THE REGULATOR TO THE TANK
Remove the dust protector from the yoke by turning the easy-grip knob in a
counterclockwise direction.
Place the yoke connector over the tank valve, positioned with the seating surface against
the valve O-Ring.
Turn the easy-grip yoke knob clockwise until secure. (FOR YOKE STYLE)
Remove the protector cap from the threads of the regulator DIN connector wheel, and
examine the threads and sealing O-Ring. (AS568-111, N90)

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Replace the O-Ring if it is damaged. Use care not to cross the threads. Thread the DIN
connector wheel clockwise into the cavity of the tank valve until it is secure. (FOR DIN
STYLE)
Slowly open the tank valve (with the pressure gauge facingaway from you).
Momentarily purge the second stage and then listen to ensure that no breathing gas is
leaking from the regulator or valve connection.
If any leakage is observed, inspect the sealing O-Ring. Replace if damaged or if it does not
seal properly
If gas still leaks, DO NOT USE.
Take the regulator and SCUBA cylinder to an authorized supplier or dealer for inspection
and service.
TO REMOVE THE REGULATOR FROM THE SCUBA
CYLINDER
Close the tank valve and purge all breathing air from the regulator system by pressing the
purge button of the second stage regulator.
Ensure that all pressure has been purged.
Turn the easy-grip yoke knob counterclockwise to loosen and lift the first stage off the tank
valve. (FOR YOKE STYLE)
Turn the DIN connector wheel counterclockwise out of cavity in the tank valve. (FOR DIN
STYLE)
Prevent water from entering the first stage.

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DO NOT blow breathing air near a first stage that does not have the dust protector in place.
Dry the dust protector, position it within the yoke, and secure it by tightening the yoke knob.
(FOR YOKE STYLE)
Place the protector cap on the threads of the regulator DIN connector wheel. (FOR DIN
STYLE)
REMOVAL OF HOSES FROM FIRST STAGE
WARNING: Purge all pressure from the first stage before attempting hose removal and
remove from the SCUBA cylinder.
Loosen and remove the hose by turning it in the counterclockwise direction with an open-
end wrench of the appropriate size. For a LP hose use a 3/8 open-end wrench and for an
HP hose use a 7/16 open-end wrench.
Lightly lubricate the threads and O-Ring of the port plug with Christo-Lube MCG129
lubricant.
Thread the port plug clockwise into the port and tighten to a torque of 30 in-lbs. using a
4mm hex key.
Store the dried regulator in a clean bag or storage box, away from sunlight, excessive heat
and humidity.
REGULATOR SECOND STAGES
The second stage of the regulator assembly receives breathing air at an intermediate
pressure of approximately 140 psi from the first stage and delivers it to you at ambient
pressure during inhalation.
When you stop inhaling, the second stage regulator shuts off the flow of breathing air and
provides a path for exhaled air.
All second stage regulators have a level of sensitivity that can result in excess breathing air
being expelled in the water when the second stage is not in your mouth.
When this occurs, it is usually during entry into the water or when on the surface.

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This condition, referred to as free-flow, can usually be stopped by turning the second stage
so the mouthpiece is pointing down and the purge button is pointing up.
It is recommended to carry an Octopus (alternate air source) with the mouthpiece facing
down when not in use, turn the Venturi pad lever to the minimum setting or use a
mouthpiece plug or cover to prevent free-flow in case it is bumped.
During normal use underwater, a small amount of water collects inside the body of a
standard regulator in a natural reservoir near the bottom.
This is normal for most second stages, and the water is held away from your mouth
naturally and will go unnoticed unless you become inverted or do subaquatic somersaults at
which time you may experience temporary ‘wet breathing’.
Water can be purged from the small internal air space of most second stages by exhaling a
small puff of breathing air into the mouthpiece, or by blocking the mouthpiece with your
tongue and pressing the front mounted purge button to initiate a flow of breathing air.

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VENTURI PAD LEVER
The second stages fitted with a deflator-effect adjusting lever. This lever modifies the
inhaled air flow by means of an internal vane. This allows the breathing performance of your
regulator to be adjusted to match your needs.
When the Venturi pad lever is set on “max” the ease of breathing will be at its maximum.
When the Venturi pad lever is set on “min” the breathing resistance will be increased.
We recommend that you set the knob in the “min” position when you do not have the
regulator on your mouth.
We recommend that you set the lever in the “max” position when you are breathing through
the regulator.
MIN POSITION,
PRE-DIVE
MAX POSITION

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SENSITIVITY ADJUSTING KNOB
This inhalation adjusting knob allows you to adjust the sensitivity of the regulator.
This is done to prevent undesirable loss of breathing gas (free flowing) that often occurs
when a high-performance regulator second stage is connected as an octopus second
stage, or when the primary second stage is not in the diver’s mouth, such as when surface
swimming.
When you screw the knob in, the force holding the valve against the seat is increased,
which reduces the regulator’s sensitivity; the inhalation effort required to open the valve is
then increased.
This sensitivity adjustment allows you to compensate for the difference in hydrostatic
pressure between your pulmonary center and your demand valve.
Turning the adjustment knob ‘counterclockwise’ decreases breathing resistance and
reduces work of breathing.
Turning the adjustment knob ‘clockwise’ increases breathing resistance and increase work
of breathing. When you hear a ‘click’ it means that it’s reached its maximum resistance.
Please don’t turn anymore.
Adjustment should be used to improve performance, not be used as a method to use less
breathing gas.
During heavy exercise underwater, and to compensate for the effects of depth, it is
advantageous to have a regulator that will provide minimal inhalation resistance and
optimal performance when desired.

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CLEAN OR CHANGE
THE COVER RING OR THE PURGE COVER
If you want to clean or change the different color (or style) of the ring or purge cover, please
use the following process. The regulator should NOT be connected to the SCUBA Cylinder.
1. Unscrew the cover ring from the housing.(No tools required)
2. Remove the purge cover and washer.
3. Select your purge cover or cover ring.
4. Assemble them and install the diaphragm washer into the cover assembly on top of
the diaphragm
5. Screw the cover ring assembly into housing and hand tighten the ring.

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USER CARE AND MAINTENANCE
It is important to provide the proper preventative maintenance to ensure the best possible
performance and maximum life of your OMS Airstream Evoque regulator.
The following maintenance procedures should be performed routinely after each use to
ensure that the regulator is cleaned, inspected, and prepared for the next use.
Whenever the regulator is removed from the cylinder valve, it is important that the dust cap
is installed over the regulator inlet fitting.
This is critical to prevent the entrance of moisture into the regulator first stage.
This cap is normally attached to the regulator first stage yoke and may therefore be wet.
Wipe or blow the dust cap completely dry before securing it over the inlet fitting.
As soon as possible after diving, thoroughly rinse the regulator with clean fresh
water while it is attached to a cylinder and pressurized with air.
If possible, transport your regulator assembly (preferably dry) in a padded carrying case or
equipment bag separated from sharp items that might damage or scratch the components.
You should also protect the second stage from damage from heavy objects.

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MARKING
EVS-EN 250A：2014
Airstream
Airstream for DIN

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Airstream for YOKE
Evoque
Evoque

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General Precautions & Warnings
Before using this regulator, you must receive instruction and certification in SCUBA diving
from a recognized training agency.
Use of SCUBA equipment by uncertified or untrained persons is dangerous and can result
in injury or death. This regulator is not configured for commercial use with surface supplied
air.
Always pressurize the regulator gradually by opening the cylinder valve SLOWLY.
Unless instructed, NEVER apply any type of lubricant to any part of the regulator or
cylinder valve.
DO NOT apply any type of aerosol spray to the regulator. Doing so may cause permanent
damage to certain plastic components, including the second stage housing. Factory
prescribed service for this regulator must be performed at least once annually by a factory
trained OMS service technician who is employed by an authorized dealer. Disassembly,
repair, or first stage adjustment must not be attempted by persons who are not factory
trained and authorized by OMS.
DO NOT leave a cylinder standing unsecured with the regulator attached to the valve.
Doing so may cause permanent damage to the regulator and cylinder valve if the cylinder
falls over.
DO NOT carry SCUBA equipment by the first stage when it is connected to a cylinder.
Always carry the cylinder by the cylinder valve or an attached carrying device.
When diving in cold water (below 10°C, or 50°F), you must have received training and
certification in the techniques of cold water diving from a recognized training agency.
Correct Selection of specific cold water equipment is required.
Any equipment marked with the greater than 10º Celsius symbol; (> 10°C) is only suitable
for water temperatures above 10°C or 50°F.
When configuring your regulator for use with emergency auxiliary Breathing systems
(Octopus), the correct selection of equipment is required.
Any equipment marked with EN250A is suitable for use with an octopus.

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Introduction
Congratulations—and thank you—for choosing OMS. All OMS regulators have been
designed and manufactured with pride in the Taiwan.
Your OMS regulator is covered by OCEAN MANGEMENT SYSTEMS GMBH Warranty
against defects in materials or workmanship. This warranty is only extended to the original
purchaser, and is not transferable. For more information, be sure to read the warranty
section of this manual, and remember to save your sales receipts. Copies of these receipts
must be presented whenever obtaining warranty service.
Your regulator’s performance relies greatly on the care and maintenance it will receive, in
addition to regularly scheduled services. Before you dive with your new OMS regulator, it is
important to read this manual in its entirety to become familiar with the regulator’s features.
It is just as important to understand the correct procedures for setup, pre-dive inspection,
and post-dive maintenance.
WARNING: Improper use or misuse of SCUBA equipment may result in
serious injury or death. Read and understand this owner’s manual
completely before diving with your OMS regulator.
NOTE:OMS Airstream (DIN or YOKE) First Stage and OMS Evoque 2nd Stage regulators
have been examined by INPP, Port de la Pointe Rouge - E3 - BP. 157 - 13267 Marseille
CEDEX 08-FRANCE, notified body for PPE identification number 0078.
*EN250:2014 Respiratory equipment – Open Circuit Self Contained Compressed Air
Diving Apparatus – Requirements, Testing and Marking is a European normative standard
published in 2014, which includes new minimum requirements such as Auxiliary Emergency
Breathing Systems, Annex B and has replaced EN250:2000.
The purpose of this European Standard is to ensure a minimum level of safe operation for
apparatus down to a maximum depth of 50 metres (164ft) at 10°C (50°F). OMS regulators
have been tested beyond and far exceeds this requirement.