Tusa RS-350 User manual

EN250
TUSA REGULATORS
TUSA-ATEMREGLER
DÉTENDEURS TUSA
TUSA ADEMAUTOMATEN
REGULADORES TUSA
EROGATORI TUSA
OWNER’S MANUAL
BEDIENUNGSANLEITUNG
MANUEL D’UTILISATEUR
HANDLEIDING
MANUAL DEL PROPIETARIO
LIBRETTO ISTRUZIONI
BEFORE USING ANY TUSA REGULATOR, READ THIS MANUAL COMPLETELY.
VOR GEBRAUCH EINES TUSA-ATEMREGLERS DURCHLESEN.
AVANT D’UTILISER UN DETENDEUR TUSA, VEUILLEZ LIRE CE MANUEL
COMPLETEMENT.
LEES DEZE HANDLEIDING VOLLEDIG VOOR U UW TUSA-ADEMAUTOMAAT GEBRUIKT.
SĺRVASE LEER COMPLETAMENTE ESTE MANUAL ANTES DE UTILIZAR.
CUALQUIER REGULADOR TUSA.
PRIMA DI UTILIZZARE UN EROGATORE TUSA DI QUALSIASI TIPO, SI RACCOMANDA DI
LEGGERE A FONDO IL PRESENTE LIBRETTO ISTRUZIONI.
RS-340, RS-350, RS-460II, RS-520,
RS-530, RS-560, RS-670, RS-680, RS-760,
RS-790, RS-811, RS-811S, RS-812,
RS-812S, RS-860, RS1001

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Regulators
FOREWORD
CONGRATULATlONS! You are now the owner of one of the many ne TUSA prod-
ucts. Your new regulator is built to exacting standards, using only the highest quality
materials. For several years now TUSA has been developing the regulators under
the ISO9001 International Quality Assurance System.You have purchased the new-
est, 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 ad-
vanced materials and the performance provides exceptional aspiration flow and
allows fully adjustable performance to accommodate beginner and professional div-
ers.
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.
CE Certied combinations of TUSA Regulators are listed below:
Name of
Regulator 1st Stage Model No.
2nd Stage Safe 2nd Stage
Model No. Cover Model No. Cover
RS-340 R-300 (Yoke-DIN) S-40 BLACK SS0001 YELLOW
RS-350 R-300 (Yoke-DIN) S-50 SILVER SS-11 YELLOW
RS-460II R-400II (Yoke -DIN) S-60 BLACK SS-20 YELLOW
RS-520 R-500 (Yoke-DIN) S-20 BLACK SS-60 YELLOW
RS-530 R-500 (Yoke-DIN) S-30 BLACK
RS-560 R-500 (Yoke-DIN) S-60 GREY
RS-670 R-600 (Yoke-DIN) S-70 SILVER
RS-680 R-600 (Yoke-DIN) S-80 BLACK
RS-760 R-700 (Yoke-DIN) S-60 GREY
RS-790 R-700 (Yoke-DIN) S-90 GREY
RS-811 R-800 (Yoke-DIN) S-11 BLACK
RS-811S R-800S (Yoke-DIN) S-11 BLACK
RS-812 R-800 (Yoke-DIN) S-12 BLACK
RS-812S R-800S (Yoke-DIN) S-12 BLACK
RS-860 R-800 (Yoke-DIN) S-60 GREY
RS1001 R1000 (Yoke-DIN) S0001 BLACK

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RS-460II, 560, 760, 790, 811, 811S, 812, 812S, 860, 1001
Notice:
“The PPE (Personal Protective Equipment) mentioned in this User’s Manual was
submitted to tests for validation of the design and certied according to Art. 10 of
Directive 89/686/EEC by RINA - Via Corsica, 12-16128 Genova ITALY, Notied body
n 0474. This device is in compliance with EN 250:2014.
The CE marking means the compliance of the device to the Basic Health and Safety
Requirements of Annex II of Directive 89/686/EEC. The number 0474 near the CE
identies the Notied Body RINA, entitled for the EC quality control system for the
nal product according to Art. 11.A of Directive 89/686/EEC.”
RS-340, 350, 520, 530, 670, 680
Notice:
“The PPE (Personal Protective Equipment) mentioned in this User’s Manual was
submitted to tests for validation of the design and certied according to Art. 10 of
Directive 89/686/EEC by ITALCERT - Viale Sarca 336, 20126 Milano ITALY, Notied
body n 0426. This device is in compliance with EN 250:2014.
The CE marking means the compliance of the device to the Basic Health and Safety
Requirements of Annex II of Directive 89/686/EEC. The number 0426 near the CE
identies the Notied Body ITALCERT, entitled for the EC quality control system for
the nal product according to Art. 11.A of Directive 89/686/EEC.”
Notice:
The Standard EN 250: 2014 defines a SCUBA unit as an open-circuit, self-contained
underwater breathing apparatus at a minimum, must include in the least:
1. Cylinder(s) with valve(s);
2. On demand regulator(s);
3. Pressure Gauge for monitoring cylinder(s) pressure;
4. Diving Mask;
5. A transport, carrying system
The SCUBA unit may also include: Alternative air source, diving computer/gauges or other
safety devices.
WARNING:
SCUBA used simultaneously by multiple divers are limited to depths no greater than
30 meters and water temperatures less than 4°C as marked “EN250A”, when marked
“EN250A>10°C” water temperatures less than 10°C.
WARNING:
SCUBA marked “EN250A” in compliance with EN250: 2014 can be used simultaneously by
multiple divers as an escape device.

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Regulators
TABLE OF CONTENTS
SECTION Page No.
I Warning - Read Carefully .........................................................................4
II Description and Operation ........................................................................5
2.0 General ................................................................................................5
2.1 First Stage ...........................................................................................5
2.2 Second Stage ......................................................................................6
III Pre-Dive Procedures..................................................................................8
IV After Dive Procedures ...............................................................................9
V Contaminated Water Diving ......................................................................10
Vl Cold Water Diving .....................................................................................10
VlI Scheduled Maintenance ...........................................................................11

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SECTION I
WARNING READ CAREFULLY
Unless otherwise specied TUSA regulators should be used only with open circuit
compressed air breathing equipment. Its use with oxygen-enriched air is not autho-
rized and is dangerous. The compressed air must be in compliance with the stan-
dard EN 12021.
Before any attempt is made to use this regulator underwater, you MUST have re-
ceived training and CERTIFICATION in the technique of sport diving from a recog-
nized certication agency. Use of this equipment by a person who is not certied by
a recognized agency shall render all warranties, express or implied, null and void.
Use of regulators by uncertied 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 func-
tional test. NEVER dive with a regulator which shows signs of damage or provides
substandard performance.
Always use regulator as designated combination of rst stage and second stage. As
inappropriate combination of rst and second stages may result deterioration of per-
formance, do not connect other second stage to these (R-300, 400, 500, 600, 700,
800, 800S, 1000) rst stages or vice versa.
Repair, servicing, or addition of accessories (e.g. pressure gauge) to this regulator is
to be performed ONLY by a qualied TUSA Service Facility. The HP and LP outlets
of the rst stage have intentionally been tted with different threads to prevent the
possibility of incorrect tting 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-340, 350, 460, 520, 530, 560, 670, 680, 760, 790, 811, 811S, 812, 812S
860, and 1001 are intended to be used up to a 50 meter (164 feet) maximum
water depth only.
Model RS-340, 350, 520, 530, 560, 670, 680, 811, 811S, 812, 812S, and 860 are
restricted to be used above the water temperature 10°C.
Model RS-460, 760, 790, and 1001 can be used in temperatures less than 10°C.

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Regulators
SECTION II
DESCRIPTION AND OPERATION
2.0 GENERAL
TUSA Regulators are BALANCED PISTON and BALANCED DIAPHRAGM type SIN-
GLE HOSE REGULATORS. The regulator reduces high pressure air from the scuba
cylinder to ambient pressure suitable for breathing, through the operation of rst and
second stage regulators. The rst 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 rst and
second stages of the regulator are connected by a low pressure hose. A swivel yoke
(TYPE INT) on the rst stage body secures the regulator to the cylinder valve, while
an O-ring surrounding the outlet orice on the cylinder valve ensures an airtight con-
nection to the rst stage.
2.1 FIRST STAGE
R-300 rst stage
In order to achieve natural breathing, a dynamic ow hose with a large inner diam-
eter increases the airow. The R-300 always supplies the diver with stable air at any
tank pressure or depth, delivering maximum breathing ease and comfort for them.
R-400 rst Stage
The TUSA R-400 offers a first stage with the balanced diapraghm method. This
method features minimum variation in intermediate pressure in response to changes
in residual cylinder pressure and depth. The R-400 is engineerd for cold water diving
(EN-250-2000). It also offfers two high high ow LP ports (HFP) that are close to the
diapraghm to increas the airow by aproximately 15%.
R-500 rst stage
The very popular balanced piston type rst stage offers superior reliability for stable
air supply regardless of depth or residual pressure.
R-600 and R-600 DRY rst stage
With the R-600, offers a compact design weight of just 630g during actual use.
This allows the R-670 to only be a total weight of just 1050g for the rst and sec-

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Regulators
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ond stages.The balanced diaphragm method rst stage features minimum variation
in intermediate pressure in response to changes in residual cylinder pressure and
depth. The ports are in left-right symmetry (H.P. × 2, L.P. × 4) for easier attachment
to tanks, even for beginners.
R-700 rst Stage
The R-700 is a balanced diaphragm first stage with key design and performance
characteristics:
1) Four intermediate pressure ports and two high pressure ports, 2) Balanced rst
stage, with a built-in antifreeze system, 3) Replaceable HP seat and HP poppet for
durability and servicing, 4) Two special high ow LP ports (HFP) close to the dia-
phragm offer approximately 15% greater air ow, 5) Dry balance chamber prevents
water contact with the diaphragm and the spring for superior cold water perfor-
mance. The R-700 meets the European Standards EN250:2014 requirements for
cold water conditions.
R-800, 800S rst Stage
The R-800 is a balanced piston type rst stage offering superior reliability for stable
air supply regardless of depth or residual pressure. It is equipped with four interme-
diate low pressure ports and two high pressure ports.
R1000 rst Stage
The R1000 is a balanced diaphragm rst stage with four intermediate pressure ports
and two high pressure ports. Two special high ow low pressure ports (HFP) close
to the diaphragm offer approximately 15% greater airow. The R1000 meets the Eu-
ropean Standards EN250:2014.
2.2 SECOND STAGE
Demand system
* The demand system is designed to signicantly reduce rubbing resistance of mov-
ing parts and air resistance. The result is smoother and more natural valve opening/
closing.
Light weight housing
* The second stage main unit is smaller and lighter to reduce water resistance dur-
ing diving, thus reducing the load on the face during use. The main body materials
are super-tough nylon (heat pliable polyamide resin) reinforced with glass ber for

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Regulators
outstanding hardness and shock resistance. The materials also offer superior tensile
strength, dimensional stability, heat resistance, weather resistance and chemical re-
sistance.
Intake resistance
* The second stage includes a director to forcibly guide air from the demand valve.
That prevents free ow while signicantly lessening intake resistance. The result is
one of the lightest intake resistance values in the industry compared with products
from other companies.
New mouthpiece
The new mouthpiece, developed on the basis of ergonomic engineering, further
enhances the comfort of bite, t, and stability. Even with a light bite, a high level of
stability is achieved, so there is no fatigue from long periods of usage.
Venturi Adjustment Lever (RS-680, 790, 811, 811S, 812, 812S, 1001)
The addition of a venturi adjustment lever allows the regulator to power assist the
diver when underwater utilizing the natural venture effect. The diver can also adjust
the lever to prevent free ow such as on a surface swim.
Swivel joint (RS-340, 350, 670, 680, 812, 812S)
For optimum performance and comfort, a swivel joint is tted between the second
stage and the joint section of the low pressure hose. The swivel joint allows exibility
of the hose for eliminate hose tension at the mouthpiece for a more natural and com-
fortable bite.
S.E.A. -Sequential Exhaust Assist [PAT.P.] (RS-680)
The Sequential Exhaust Assist (S.E.A.) is an auxiliary exhaust valve, located on top
of the S-80 elliptical case to decrease primary exhaustion resistance.
Click Spring Adjustment (RS-340, 350, 680)
The click spring adjustment feature is exclusive to TUSA. It is a 5 position adjust-
ment knob designed to better control breathing resistance.
Adjustable Control Knob (RS-812, 812S)
The adjustable knob designed to better control breathing resistance.

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Regulators
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Regulators
diving, thus reducing the load on the face during use. The main body materials are
super-tough nylon (heat pliable polyamide resin) reinforced with glass fiber for out-
standing hardness and shock resistance. The materials also offer superior tensile
strength, dimensional stability, heat resistance, weather resistance and chemical resis-
tance.
Intake resistance
* The second stage includes a director to forcibly guide air from the demand valve. That
prevents free flow while significantly lessening intake resistance. The result is one of the
lightest intake resistance values in the industry compared with products from other
companies.
New mouthpiece
The new mouthpiece, developed on the basis of ergonomic engineering, further
enhances the comfort of bite, fit, and stability. Even with a light bite, a high level of sta-
bility is achieved, so there is no fatigue from long periods of usage.
Venturi Adjustment Lever (RS-680, SS-80)
The addition of a venturi adjustment lever on the S-80 allows the regulator to power
assist the diver when underwater utilizing the natural venture effect. The diver can also
adjust the lever to prevent free flow such as on a surface swim.
Swivel joint (RS-350, 340, 654, 680, 670)
For optimum performance and comfort, a swivel joint is fitted between the second stage
and the joint section of the low pressure hose. The swivel joint allows flexibility of the
hose for eliminate hose tension at the mouthpiece for a more natural and comfortable
bite.
“Air Refresher” filter (RS-350)
There are two types of high tech filter built into the second stage. An active carbon filter
cleans the air and absorbs smells, while a metal fiber filer eliminates particles as small
as 100 microns.This makes sure that the cleanest and safest air is supplied to the diver.
S.E.A. -Sequential Exhaust Assist [PAT.P.] (RS-680)
The Sequential Exhaust Assist (S.E.A.) is an auxiliary exhaust valve, located on top
of the S-80 elliptical case to decrease primal exhaustion resistance.
SECTION III
PRE-DIVE PROCEDURES
WARNING
Do not attempt to connect low pressure hoses to the high pressure ports with the use
of an adapter. Improper connection will cause damage to the equipment and could
result in serious personal injury. Low pressure components are not intended to
withstand
pressures greater than 28Bar ≒ (400 PSI). When installing your accessory
hoses, avoid damaging the O-ring. Tighten gently, but firmly into the first stage housing.
SCUBA complying with EN 250 are not intended for more than one user to breathe from
at the same time.
If SCUBA are configured and used by more than one diver at the same time, then the
cold water and breathing performances may not fulfil the requirements of EN 250.
RS-350, 340
Always connect the Octopus Regulator to the portmarked with SS. Connecting to any
other port is strictly prohibited.
PRE-DIVE OPERATING INSTRUCTIONS
1. Position the tank valve so the outlet points toward the diver.
2. Remove the dust cap from the first stage inlet and place the yoke (or DIN adaptor)
in the center of the cylinder valve connection.
3. Position the first stage body so that the second stage hose goes over the right
shoulder of the diver.
4. Hand-tighten the yoke screw or DIN adoptorscrew.
5. Check all the hose connections to the first and second stages. If they can be
loosened by hand, they should be tightened with a wrench before pressurizing.
6. Check the submersible pressure gauge to make sure it indicates zero pressure.
7. Open the tank valve slowly to gradually allow air into the regulator.
NOTE: During this operation, depress the second stage purge button to reduce
shock to the valve mechanism. Do not perform this operation in a cold environment
below 10°C (50°F). Performing this in a cold environment may cause “freeze-up” of
the regulator which can render it inoperable. If this occurs, you should contact a
TUSA authorized service center.
8. Check the submersible pressure gauge to ensure that it indicates the proper tank
pressure.

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Regulators
9. Check the tank/regulator connection for leakage. If leakage exists, it may be cause
d
by incorrect mounting of the regulator on the tank valve, or by a damaged O-ring i
n
the tank valve.
10. To confirm that the regulator delivers air properly, first exhale through th
e
mouthpiece to blow any foreign matter out of the second stage, then inhale. A fe
w
of these breathing cycles should immediately indicate proper function.
11.If you are using the second stage as an Octopus regulator, it is strongly
recom-
mended to utilize an Octopus plug to prevent any foreign matter from entering th
e
second stage through the mouthpiece.
12.When the second stage is not in your mouth, uncontrolled air delivery can tak
e
place. This can be stopped by turning the second stage upside down and allowin
g
it to fill with water. Should the air delivery continue, abort the dive and have th
e
regulator inspected by a TUSA Authorized Service Center.
SECTION IV
AFTER DIVE PROCEDURES
Providing the best possible preventative and routine maintenance before, after, an
d
between dives will help to ensure the maximum life of your TUSA Regulator. To achiev
e
this goal, there are a number of simple, yet important, routine maintenance procedure
s
that should be followed by the diver after each use of the equipment. The follo
wing
procedures should be diligently followed in order to obtain the maximum life
and
serviceability from your regulator.
1. After each day of diving, the regulator must be cleaned, inspected, and prepared f
or
the next use, or for storage. As soon as the regulator is removed from the
air
cylinder, reinstall the dust cap over the regulator inlet port. This cap is normall
y
attached to the First Stage and therefore has been under water. Be sure to dry
all
the water out of this cap before securing it over the inlet port. Ensure that the O-r
ing,
if fitted, is in place inside the dust cap.
2. As soon as possible after diving, the regulator should be soaked in warm, not ov
er
50°C (122°F) water to remove salt and mineral deposits. The preferred method is t
o
attach the regulator to a charged air cylinder, open the cylinder valve, an
d
thoroughly soak both the first and second stage regulators . Pay particular attentio
n
to directing water into the mainspring cavity of the first stage regulator, the secon
d
stage mouthpiece, and the holes in the second stage cover. Depress the purg
e
button several times while the regulator is submerged in water. Dry the regulator b
y
pressing on the purge button with the mouthpiece pointing down.Place the dust ca
p
in position in the yoke, or over the DIN screw.
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Regulators
SECTION V
CONTAMINATED WATER DIVING
Sophisticated diving gear designed for use in contaminated water provides constant
positive pressure inside the regulator case and utilizes redundant exhaust valve
passages. TUSA regulators are not designed to provide this requirement and therefore
are not recommended for use in contaminated water diving.
SECTION VI
RS-350/340/680/790 DRY USE IN
COLD WATER DIVING
This is important information.Be sure to read it.
WARNING:
RS-350/340/680/790DRY regulators for the European market have passed the cold water
performance test (water temperature:4°C) specified by EN250.
Soaking regulator parts in warm water will remove more salt and mineral deposits
than will conventional rinsing.It will loosen deposits on interior components that
rinsing will not (If no charged air cylinder is available, follow the above procedure but
be very careful NOT to depress the purge button, or leave dust cap off, when the
regulator is submerged in water. Failure to do this will allow water to enter both
regulator stages and may result in internal corrosion).
Simply soak the entire exterior of the first stage thoroughly, and proceed as above
when cleaning the second stage.
3. Store in a clean equipment box, or as an alternative, seal inside a plastic bag.Store
in a clean dry place.
4. Lightly lubricate the yoke screw with silicone grease.
5. Never store the regulator while it is still connected to the diving cylinder.
6. Do not use any type of solvent to clean any part of the regulator. Do not expose any
part of the regulator to silicone spray, as some aerosol propellants attack or degrade
rubber and plastic material.
7. Do not carry the diving cylinder by the regulator as such abuse will eventually
damage the regulator or the cylinder valve. Do not expose the regulator to
unnecessary shocks or impact.