Sherwood Scuba Magnum Pro SRB9350 User manual

SHERWOOD
OWNER’S MANUAL
MAGNUM

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Magnum Regulator
SRB9350

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Thank you for choosing the
Sherwood Magnum Regulator.
To get the most satisfying use of this product, please take time to read this entire manual to
understand the use and limitations of the product before you attempt to use it. If you have
any questions contact your Authorized Sherwood Scuba Dealer for immediate attention or you
may contact us at www.SherwoodScuba.com.
This manual uses standard signal words and symbols to communicate the presence of possible
hazards. The denitions of these indicators are as follows.
WARNING
Indicates a potentially hazardous condition or situation which, if not
avoided, could result in serious personal injury or death.
CAUTION
Indicates a potentially hazardous condition or situation which if not avoided
may result in moderate or minor injury. It may also be used to alert against
practices that may cause harm or permanent damage to equipment.

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TABLE OF CONTENTS
WARNINGS AND PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . .5–7
a. Training requirements
b. Service requirements
c. Nitrox use
d. Cold water use
INITIAL SET-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
BEFORE THE DIVE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8–9
DIVING WITH THE REGULATOR . . . . . . . . . . . . . . . . . . . . . . . . .9
AFTER THE DIVE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
STORAGE AND DEALER SERVICE . . . . . . . . . . . . . . . . . . . . . . .10–11
WARRANTY INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . .11–12
PRODUCT REGISTRATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

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PLEASE READ CAREFULLY BEFORE ATTEMPTING TO USE THIS EQUIPMENT
WARNING
1. Sherwood Scuba equipment is intended for use only by persons trained and certied by a
nationally recognized scuba training agency. Diving without the specic training including safe
diving practices and within the limits dened by the training agency exposes the user to extremely
hazardous situations that could result in serious personal injury or death. This manual is not a
substitute for the instruction needed to dive in a safe manner.
2. Sherwood regulators must not be serviced by anyone untrained. To perform the correct service
or repair procedures, return your equipment to an Authorized Sherwood Dealer. Any time the
equipment appears to be performing incorrectly or when recommended service is needed, return
your equipment to an Authorized Sherwood Dealer.
Do not attempt to disassemble or modify the equipment. Equipment that is not properly serviced
could lead to a malfunction during use with possible personal injury or death.
3. Nitrox use (Enriched Air Nitrox) – Requires specialized training to avoid hazards that could lead
to serious injury or death. Be certain to read the information in this manual concerning Nitrox use.
4. Cold water use – Diving in water temperatures less than 50°F (10°C) can impose operational
limits aecting the reliable operation of the equipment. If you plan to use your Sherwood regulator
in water temperatures less than 50 F ( 10 C), you are advised to rst obtain training in the diving
techniques that apply to cold water diving. This training must include appropriate methods that
reduce the opportunity for ice formation whenever high air ow is expected. This training must also
include the appropriate emergency response for dealing with a regulator free ow associated with
ice formation in the regulator interior.

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WARNING
ENRICHED AIR NITROX (EAN)
The Sherwood Magnum (SRB9350) regulator has been designed and manufactured for use
with clean air or Nitrox mixtures containing no more than 40% oxygen.
Preparation for use with oxygen enriched gas mixtures requires the proper selection of
compatible materials and clean manufacturing practices that minimize the presence of
combustible materials inside the regulator. Your Sherwood regulator has been manufactured
observing these requirements.
Use of Enriched Air Nitrox (EAN) exposes the user to additional risks that
are not present when diving with standard air. Breathing EAN under pressure
requires a full understanding of these risks and requires specic instruction
beyond that taught in basic scuba training.
Additionally, equipment exposed to EAN must be congured and maintained
properly to avoid the risk of re associated with use of oxygen enriched gases.
Failure to understand and avoid these risks may lead to serious personal
injury or death.

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In order to maintain the necessary level of cleanliness Sherwood recommends that the regulator
be dedicated to Nitrox use only.
However, if you wish to use the regulator with Nitrox and air interchangeably, you must exercise
care to pass only clean air through the regulator. The level of cleanliness must be such that
it contains condensed hydrocarbons of not more than 0.1 mg/ liter. If you are uncertain as to
whether the air you expect to use meets this cleanliness requirement it is recommended that
you avoid air use or have the regulator cleaned for EAN service before exposure to EAN.

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INITIAL SET UP
Your Sherwood regulator provides options for the attachment of accessories such as the
submersible pressure gauge or dive computer, the buoyancy compensator inator air supply
and the alternate air source (octo).
Sherwood recommends that you consult your Authorized Sherwood Dealer to install these
accessories for you.
BEFORE THE DIVE
It is important to inspect the regulator before starting your dive trip and again just before you
enter the water. The pre-dive check should consist of at least the following steps.
1. Carefully inspect all hoses for signs of damage. This may require you to retract the
hose protectors at the ends of the hoses to examine the hose condition near the end
ttings. If the hose is damaged have your Authorized Sherwood Dealer replace it
before you dive.
2. Visually inspect the entire regulator for signs of damage. If in doubt ask your
Authorized Sherwood Dealer to assist you in performing this examination.
3. Connect the regulator to a pressurized cylinder and press the purge button several
times to conrm air ow. Take a few test breaths. The eort to breathe should be
minimal. If there is an unusual breathing resistance, have your regulator checked by a
professional instructor or by your Authorized Sherwood Dealer before attempting to
enter the water.

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DIVING WITH THE REGULATOR
WARNING
4. Once pressurized, do not attempt to reposition the rst stage to achieve a dierent
hose orientation. Further, do not attempt to carry the assembly by the hoses or by
using the installed regulator as a handle for lifting the cylinder. This may damage
components and compromise your dive.
5. The Magnum regulator provides the user with a device to control the venturi assist
that is intended to decrease inhalation resistance at high ow rates. The maximum
assist or least resistance is present when the switch is rotated clockwise toward the
mouthpiece of the second stage. The venturi assist is reduced (breathing resistance is
increased) when the switch is rotated counterclockwise toward the front of the second
stage. When the venturi assist is reduced the regulator will be more stable when the
second stage is unattended. When the user is breathing the switch should be in the
least resistance position.
You must be aware of and observe special measures for diving in cold water
at temperatures below 50°F (10°C) in order to minimize the risk of regulator
freezing. Training must include emergency measures for dealing with regulator
free ow. Failure to obtain the necessary training and mastery of the skills
needed before diving in cold water could lead to hazardous conditions with
possibility of serious personal injury or death.

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Your Sherwood regulator has been designed to provide an ample air supply with minimal
resistance. This should provide you with many hours of comfortable diving. However, if you
feel the breathing for any reason is labored or distressing do not continue to dive. Have the
regulator evaluated by your Authorized Sherwood Dealer before continuing to dive with it. The
initial opening eort required to start air ow with inhalation is intentionally set low to provide
you with eortless breathing. You may also unintentionally start air ow if you impact the
second stage upon entry or suddenly remove the regulator from your mouth during inhalation.
Sometimes this will cause the regulator to continue to ow. If this occurs, simply cover the
mouthpiece opening with your thumb or replace the regulator in your mouth. The ow should
stop. If it does not, then you must terminate the dive and have the regulator examined.
AFTER THE DIVE
The best time to clean your regulator is as soon as possible after concluding diving activity for
the day. Delayed rinsing of the equipment increases the opportunity for corrosion or deposits
to form which eventually may degrade performance of the regulator.
If possible, you should rinse the regulator while it is still pressurized. This minimizes opportunities
for contaminants to reach interior passages of the regulator.
If you are not able to leave the unit pressurized for rinsing, then be certain to replace the
rst stage inlet protector (Dust Cap) before rinsing. During the rinsing process do not depress
the second stage purge as this will open the demand valve and provide an opportunity for
contaminants to enter the valve sealing area. Dry the regulator before long term storage.