TUSA RS-790 Regulators Owner’s Manual
- June 5, 2024
- TUSA
Table of Contents
TUSA REGULATORS
RS-790, RS-811S, RS-812S, RS1001
OWNER’S MANUAL
BEFORE USING ANY TUSA REGULATOR, READ THIS MANUAL COMPLETELY.
IN-RS021-1st.
EN250
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 now TUSA has been developing the
regulators under the ISO9001 International Quality Assurance System.You have
purchased the newest, the most advanced regulator for the Sports Scuba Market
available today. The TUSA regulator is the first major improvement to the
conventional downstream 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 divers.
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 Certified combinations of TUSA Regulators are listed below:
Name of
Regulator| 1st Stage
Model No.| 2nd Stage
---|---|---
Model No.| Cover
RS-790| R-700 (Yoke-DIN)| S-90| BLACK / GREY
RS-811S| R-800S (Yoke-DIN)| S-11| BLACK
RS-812S| R-800S (Yoke-DIN)| S-12| BLACK
RS1001| R1000 (Yoke-DIN)| S0001| BLACK
Safe 2nd Stage
Model No.| Cover
SS0001| YELLOW
SS-11| YELLOW
RS-790, 811S, 812S, 1001
Notice:
“The PPE (Personal Protective Equipment) mentioned in this User’s Manual was
submitted to tests for validation of the design and certified according to
Annex V of Regulation(EU)2016/425 by RINA – Via Corsica, 12-16128 Genova
ITALY, Notified 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 Regulation(EU)2016/425. The number 0474
near the CE identifies the Notified Body RINA, entitled for the EC quality
control system for the final product according to Annex Ⅶ
Regulation(EU)2016/425.”
EU Declaration of conformity
The EU declaration of conformity is available and downloadable on the website
[https://tusa.com/eu-en/Support/EC_Declaration_of_Conformity]
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:
- Cylinder(s) with valve(s);
- On demand regulator(s);
- Pressure Gauge for monitoring cylinder(s) pressure;
- Diving Mask;
- 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 EN 250:2014 can be used
simultaneously by multiple divers as an escape device.
SECTION
WARNING READ CAREFULLY
Unless otherwise specified TUSA regulators should be used only with open-
circuit compressed air breathing equipment. Its use with oxygen-enriched air
is not authorized and is dangerous. The compressed air must be in compliance
with the standard EN 12021.
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.
Always use regulator as designated combination of first stage and second
stage.
As inappropriate combination of first and second stages may result
deterioration of 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-790, 811S, 812S, and 1001 are intended to be used up to a 50 meter
(164 feet) maximum water depth only.
Model RS-811S and 812S are restricted to be used above the water
temperature 10°C.
Model RS-790 and 1001 can be used in temperatures no less than 4°C.
DESCRIPTION AND OPERATION
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.
FIRST STAGE
R-700 first stage
The R-700 is a balanced diaphragm first stage with key design and performance
characteristics:
- Four intermediate pressure ports and two high-pressure ports,
- Balanced first stage, with a built-in antifreeze system,
- Replaceable HP seat and HP poppet for durability and servicing,
- Two special high flow LP ports (HFP) close to the diaphragm offer approximately 15% greater airflow, Dry balance chamber prevents water contact with the diaphragm and the spring for superior cold water performance. The R-700 meets the European Standards EN250:2014 requirements for cold water conditions.
R-800S first stage
The R-800S is a balanced piston type first stage offering superior reliability
for stable air supply regardless of depth or residual pressure. It is equipped
with four intermediate low pressure ports and two high-pressure ports.
R1000 first stage
The R1000 is a balanced diaphragm first stage with four intermediate pressure
ports and two high-pressure ports. Two special high flow low-pressure ports
(HFP) close to the diaphragm offer approximately 15% greater airflow. The
R1000 meets the European Standards EN250:2014.
SECOND STAGE
Demand system
- The demand system is designed to significantly reduce rubbing resistance of moving 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 during 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 outstanding hardness and shock resistance. The materials also offer superior tensile strength, dimensional stability, heat resistance, weather resistance and chemical resistance.
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.
Venturi Adjustment Lever (RS-790, 811S, 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 flow such as on a surface
swim.
Swivel joint (RS-812S)
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.
Adjustable Control Knob (RS-812S)
The adjustable knob designed to better control breathing resistance.
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.
PRE-DIVE OPERATING INSTRUCTIONS
-
Position the tank valve so the outlet points toward the diver.
-
Remove the dust cap from the first stage inlet and place the yoke (or DIN adaptor) in the center of the cylinder valve connection.
-
Position the first stage body so that the second stage hose goes over the right shoulder of the diver.
-
Hand-tighten the yoke screw or DIN adoptor screw.
-
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.
-
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. -
Check the submersible pressure gauge to ensure that it indicates the proper tank pressure.
-
Check the tank/regulator connection for leakage. If leakage exists, it may
-
Position the tank valve so the outlet points toward the diver.
-
Remove the dust cap from the first stage inlet and place the yoke (or DIN adaptor) in the center of the cylinder valve connection.
-
Position the first stage body so that the second stage hose goes over the right shoulder of the diver.
-
Hand-tighten the yoke screw or DIN adoptor screw.
-
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.
-
Check the submersible pressure gauge to make sure it indicates zero pressure.
-
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. -
Check the submersible pressure gauge to ensure that it indicates the proper tank pressure.
-
Check the tank/regulator connection for leakage. If leakage exists, it may be caused by incorrect mounting of the regulator on the tank valve, or by a damaged O-ring in the tank valve.
-
To confirm that the regulator delivers air properly, first exhale through the mouthpiece to blow any foreign matter out of the second stage, then inhale. A few of these breathing cycles should immediately indicate proper function.
-
If you are using the second stage as an Octopus regulator, it is strongly recommended to utilize an Octopus plug to prevent any foreign matter from entering the second stage through the mouthpiece.
-
When the second stage is not in your mouth, uncontrolled air delivery can take place. This can be stopped by turning the second stage upside down and allowing it to fill with water. Should the air delivery continue, abort the dive and have the regulator inspected by a TUSA Authorized Service Center.
AFTER DIVE PROCEDURES
Providing the best possible preventative and routine maintenance before, after, and between dives will help to ensure the maximum life of your TUSA Regulator. To achieve this goal, there are a number of simple, yet important, routine maintenance procedures that should be followed by the diver after each use of the equipment. The following procedures should be diligently followed in order to obtain the maximum life and serviceability from your regulator.
- After each day of diving, the regulator must be cleaned, inspected, and prepared for 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 normally 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-ring, if fitted, is in place inside the dust cap.
- As soon as possible after diving, the regulator should be soaked in warm, not over 50°C (122°F) water to remove salt and mineral deposits. The preferred method is to attach the regulator to a charged air cylinder, open the cylinder valve, and thoroughly soak both the first and second stage regulators . Pay particular attention to directing water into the mainspring cavity of the first stage regulator, the second stage mouthpiece, and the holes in the second stage cover. Depress the purge button several times while the regulator is submerged in water. Dry the regulator by pressing on the purge button with the mouthpiece pointing down. Place the dust cap in position in the yoke, or over the DIN screw. 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.
- Store in a clean equipment box, or as an alternative, seal inside a bag. Store in a clean dry place.
- Lightly lubricate the yoke screw with silicone grease.
- Never store the regulator while it is still connected to the diving cylinder.
- 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.
- 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.
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.
RS-790 DRY USE IN COLD WATER DIVING
This is important information. Be sure to read it.
WARNING:
RS-790DRY regulators for the European market have passed the cold water
performance test (water temperature: 4°C) specified by EN250.
When using these regulators in cold water at temperatures of 10°C or below, be
sure to observe the following notices.
General Caution Items
- Before you use the regulator, be sure to receive specialized instruction on cold water diving from a diving instruction authority so that you learn the necessary skills and knowledge.
- Be sure to receive orientation for the diving environment.
- Be sure to obey the instructions of your instructors and guides.
Equipment Handling Caution Items
The conditions for freezing up of the regulator change in accordance with the
breathing conditions of its user (breathing volume, breathing speed, number of
breaths) and the environment conditions before and during use.
- Do not take shallow, fast breaths. It makes freezing occur more easily.
- To avoid free-flow condition due to freezing NEVER push the purge button while the regulator is outside of the water.
- Store the regulator at room temperature. When diving, store your regulator in its bag to keep it warm until just before use.
- When waiting between dives, always keep your regulator warm. Do not leave it out in a cold environment.
- Your regulator may freeze depending on the conditions. If your regulator freezes, it may free flow. If it does, use breathing technique for free-flow conditions.
- When diving in water temperatures of 10°C or below, always swim at a safe depth from which you can perform an emergency swimming ascent.
SCHEDULED MAINTENANCE
- Do not assume that a regulator is in good working order because of storage or infrequent use. Remember that either prolonged or improper storage can still result in internal corrosion and/or deterioration of O-ring seals.
- Have your regulator cleaned and adjusted frequently. The frequency will depend upon the amount of use given the regulator and the conditions of use. However, TUSA strongly recommends inspection, overhaul and scheduled parts replacement at least once a year in order to ensure the optimum functioning of the regulator. Certain parts require replacement at specific intervals. This work must be carried out by a competent service facility. Use as rental equipment and/or in salt, chlorinated (swimming pool), or polluted fresh water might require cleaning and overhaul of the regulator every three to six months. Remember that chlorinated water is an especially bad environment for regulators as the chlorine chemically deteriorates the neoprene rubber components.
- Regularly inspect the sintered filter in the inlet port of the first-stage. If it is discolored or corroded, replacement by trained personnel is required. Also, at this point, the entire regulator may need a general overhaul with replacement of all soft seals and non-reusable components. Rust or aluminium oxide (grey powder) deposits on the sintered filter are usually an indication that salt water has entered the air cylinder and caused internal corrosion. At this time you air cylinder(s) should be internally inspected by a qualified and competent service control and then cleaned, or hydrostatically tested as required.
- Do not disassemble your regulator. There are no adjustments which can or need to be carried out by the user. Take the regulator to a qualified TUSA dealer or service facility for service. Ensure that only original parts are used to service your regulator.
FINAL NOTE
Service your Regulator often – your personal safety and the mechanical
integrity of your regulator depend on it.
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