The Enriched Air Nitrox (EAN) Policy
TUSA regulators are built with a high level of care using quality components and lubricants. The
following TUSA regulators in Standard condition have passed required testing for Enriched Air Nitrox
(EAN) use by the ASTM (American Society for Testing and Materials) G-175 test protocols.
Regulator Models: R-600, R-500, R-300 It has been confirmed as the results of fire tests for these
Standard regulators that fire will not affect the internal components of the products and that the
products will not cause fire to spread.
This means that these Standard regulators can be used with EAN having an oxygen mixture ration
equal or less than 40% and standard compressed air alternately.
EAN mixtures equal or less than 40% oxygen will not affect the internal components of the products
and consequently the products have a reduced combustion risk.
The major premise, however, of this statement is that clean compressed air must be used in this
case. If compressed air without this guarantee is used, the product must be overhauled prior to any
subsequent use of the product with EAN having an oxygen mixture ratio equal or less than 40%.
Warning
• Due to a high possibility of combustion never use EAN having an oxygen mixture ratio higher than
41% under any circumstances.
• If it is the intent of the owner to use the regulator with standard compressed air and with Enriched
Air Nitrox (EAN) clean oxygen-compatible compressed air must be used at all times.
• Non oxygen-compatible compressed air may contain hydrocarbons that contaminate the regulator
components. This contamination can cause combustion when combined with EAN mixtures.
• If unclean compressed air (usually occurring when the infilling compressor oil component becomes
mixed into the air) is used in the regulator and subsequently, EAN (with an oxygen mixture ratio
lower than 40%) is used, the remaining contamination inside the regulator greatly increases the
possibility of ignition.
Caution
• Regulator models not listed above have not been properly tested for use with Enriched Air Nitrox
(EAN).Therefore, use with EAN should be avoided at all times.
TABATA CO., LTD. JAPAN
1-3-17, Higashikomagata, Sumida-ku, Tokyo, Japan 130-0005
TEL 03-3624-2816/FAX 03-3623-9902 (Country Code=81)
TABATA MFG. [TAIWAN] CO., LTD.
No.256, Huanqu W. Rd., Dayuan Township, Taoyuan County 337, Taiwan.(R.O.C.)
TEL.03-386-5100/FAX.03-386-5103 (Country Code=886)
TABATA U.S.A. INC.
2380 Mira Mar Ave., Long Beach, CA 90815, U.S.A.
TEL 562-498-3708/FAX 562-498-1390 (Country Code=1)
TABATA AUSTRALIA PTY. LTD.
4D James Ruse Business Park 6 Boundary Road, Northmead, Sydney, NSW 2152, Australia
TEL 02-9890-4555/FAX 02-9890-5222 (Country Code=61)
©Copyright TABATA CO., LTD
Printed in Japan
Regulators
- 2 -
SECTION I
WARNING:READ CAREFULLY
Unless otherwise specified TUSA regulators should be used only with open circuit compressed
air breathing equipment.
Before any attempt is made to use this regulator underwater, you MUST have received training
and CERTIFICATION in the technique of sport diving from a recognized certification agency.
Use of this equipment by a person who is not certified by a recognized agency shall render
all warranties, express or implied, null and void. Use of regulators by uncertified or untrained
persons is dangerous and can result in severe injury or death. This regulator is not intended for
commercial use with surface supplied air.
Before each use, the regulator must be given a thorough visual inspection and functional test.
NEVER dive with a regulator which shows signs of damage or provides substandard
performance.
Repair, servicing, or addition of accessories (e.g. pressure gauge) to this regulator is to be
performed ONLY by a qualified TUSA Service Facility. The HP and LP outlets of the first stage
have intentionally been fitted with different threads to prevent the possibility of incorrect fitting
of accessories.
Always apply pressure to the regulator gradually by opening the cylinder valve SLOWLY,
NEVER lubricate any part of the regulator (especially the rubber O-ring seal between the
cylinder
valve and regulator) with a hydrocarbon-based lubricant.
Notice:
Model RS-606, 671, 681, 1103 and 1104 are restricted to be used above the water
temperature 10°C.
Maximum allowable working pressure is 3400 PSI (235bar).
SECTION II
DESCRIPTION AND OPERATION
2.0 GENERAL
TUSA Regulators are BALANCED PISTON and BALANCED DIAPHRAGM type SINGLE HOSE
REGULATORS. The regulator reduces high pressure air from the scuba cylinder to ambient
pressure suitable for breathing, through the operation of first and second stage regulators.
The first stage regulator reduces incoming high pressure air, to an intermediate pressure of
approximately 135PSI(≈9.5bar). The second stage regulator, using a diaphragm operated
demand valve, further reduces air from intermediate pressure to ambient pressure permitting
normal breathing. The first and second stages of the regulator are connected by a low pressure
hose. A swivel yoke (TYPE INT) on the first stage body secures the regulator to the cylinder
valve, while an O-ring surrounding the outlet orifice on the cylinder valve ensures an airtight
connection to the first stage.
TUSA REGULATORS
OWNER’S MANUAL
BEFORE USING ANY TUSA REGULATOR,
READ THIS MANUAL COMPLETELY.
13th.
Regulators
- 1 -
FOREWORD
CONGRATULATlONS!
You are now the owner of one of the many fine TUSA products. Your
new regulator is built to exacting standards, using only the highest quality materials. For several
years TUSA has been developing regulators at our R&D facility in Japan under the ISO9001
International Quality Assurance System. You have purchased the newest, the most advanced
regulator for the Sport Scuba Market available today. The TUSA regulator is the first major
improvement to the conventional down stream demand valve since 1988. The second stage is
constructed of technologically advanced materials and the performance provides exceptional
aspiration flow and allows fully adjustable performance to accommodate beginner and
professional diver.
Before you use your new regulator, please read this manual carefully. The following warnings,
cautions, and notes were written to make it possible for you to enjoy your diving experience
with maximum safety.
We at TUSA want you to have many years of dependable service from your new equipment and
have many memorable and safe dives.
Thank you for purchasing one of our high quality products.
WARNING:
THIS PRODUCT IS A SCUBA DIVING DEVICE AND REQUIRES PROPER
TRAINING BEFORE USE.
Name of
Regulator
1st Stage
Model No.
2nd. Stage
Model No.
Safe 2nd. Stage
Model No.
RS-606
R-600
S0006
SS-20
RS-671
R-600
S-71
SS-81
RS-681
R-600
S-81
SS0003
RS1103
R1100
S0003
SS0005
RS1104
R1100
S0004
TABLE OF CONTENTS
FOREWORD ............................................................... 1
TABLE OF CONTENTS .............................................. 1
SECTION I ................................................................. 2
WARNING:READ CAREFULLY ................................... 2
SECTION II
DESCRIPTION AND OPERATION ............................. 2
2.0 GENERAL ............................................................. 2
2.1 FIRST STAGE ........................................................ 3
R-600 first stage .......................................................... 3
R1100 First stage ......................................................... 3
2.2 SECOND STAGE ................................................... 3
Demand system ........................................................... 3
Intake resistance .......................................................... 3
New mouthpiece .......................................................... 3
Venturi Adjustment Lever (RS-681[S-81], SS-81) ........ 3
Adjustment knob(RS-681, 671, 606, 1104, SS-81) ..... 3
S.E.A. -Sequential Exhaust Assist [PAT.P.] (RS-
681[S-81], SS-81) ........................................................ 4
SECTION III
PRE-DIVE PROCEDURES ......................................... 4
PRE-DIVE OPERATING INSTRUCTIONS .................... 4
SECTION IV
POST-DIVE PROCEDURES ....................................... 5
SECTION V
CONTAMINATED WATER DIVING ............................ 5
SECTION VII
SCHEDULED MAINTENANCE .................................. 6
