Hollis Prism 2 Manuale utente
USER MANUAL
REV. 13
WARNING: INDICATES IMPORTANT INFORMATION THAT IF IGNORED MAY LEAD TO
INJURY OR DEATH.
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This is the User Manual for the Hollis PRISM 2 Rebreather.
Document #: 12-4072 Rev. 13
Release Date: 1/1/19
This manual, specifications and features of the PRISM 2 are proprietary and copyright Hollis Rebreather, LLC, 2019.
This document may not be copied or distributed without the prior agreement and authorization from Hollis
Rebreather, LLC. All information contained is subject to change. Contact the manufacturer for the latest information
or go to our website at: www.hollisrebreathers.com
The PRISM 2 is manufactured in the USA by Hollis Rebreather, LLC.
1540 North 2200 West, Salt Lake City, UT 84116. USA Ph (877) 598-5796
To ensure your user information is up to date. Please check www.hollisrebreathers.com for updates to this manual.
WARNINGS, CAUTIONS, AND NOTES
Pay attention to the following symbols when they appear throughout this document. They denote important information
and tips.
CAUTION: INDICATES INFORMATION THAT WILL HELP YOU AVOID PRODUCT
DAMAGE, FAULTY ASSEMBLY, OR UNSAFE CONDITIONS.
NOTE: indicates tips and advice.
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PRISM 2 DESIGN TEAM
Peter Readey
Bob Hollis
Robert Landreth
Art Ferguson
Chauncey Chapman
Matthew Addison
PRISM 2 MANUAL
WRITTEN BY
Matthew Addison
EDITORS
Jeffrey Bozanic
Chauncey Chapman
John Conway
Gerard Newman
CONTRIBUTORS
Jeffrey Bozanic
Gerard Newman
Dr. Richard Pyle
Sharon Readey
Kevin Watts
Hollis PRISM 2 eCCR
User Manual
Document Control Number:
12-4072 Rev. 13
Date: 1/1/19
NOTE:
Information on the operation of the Prism 2
electronics can be found in the Shearwater Petrel User
Manual which can be downloaded from https://www.
shearwater.com/support/petrel/
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GENERAL SAFETY
STATEMENTS + WARNINGS
WARNING: USE OF THE PRISM 2 MANUAL
This manual is to be used in conjunction with the Displays and Electronics User Manual for the version of
electronics your PRISM 2 is equipped with. The current copy can be found at www.hollisrebreathers.com.
This user manual does not, nor is it intended to contain any information needed to safely dive with any type of
SCUBA apparatus. It is designed as a guide for the proper setup, operation, maintenance, and eld service of the
Hollis PRISM 2 CCR only. It does NOT take the place of a recognized training agency instructor-led diver-training
course or its associated training manual(s) and materials. This user manual is intended to be used only as a type
specic addition to such training and materials, and as a user reference. This manual cannot be used as a substitute
guide for any other type of Self Contained Underwater Breathing Apparatus (SCUBA).
WARNING: GENERAL SAFETY
No person should breathe from, or attempt to operate in any way, a Hollis PRISM 2 rebreather, or
any component part thereof, without rst completing an appropriate Hollis Certied user-training
course.
Further, no PRISM 2 diver should use a Hollis PRISM 2 without direct Hollis instructor supervision until they have
mastered the proper set-up and operation of the Hollis PRISM 2 rebreather. This includes new PRISM 2 divers as
well as PRISM 2 certied divers who have been away from diving for an extended period of time and would benet
from an instructor-led refresher course to regain skills mastery of the Hollis PRISM 2. Failure to do so can lead to
serious injury or death.
Your safety while diving the PRISM 2 depends on you knowing your PPO2 (oxygen levels) at all times.
This is easily done by monitoring the Heads Up and wrist displays.
WARNING: CAUSTIC MATERIAL
The CO2 adsorbent used in the scrubber is caustic alkaline material. Take steps to protect yourself from direct lung
and skin contact. Furthermore, poor management of the breathing loop could lead to water contact with the CO2
adsorbent, causing a “caustic cocktail” (very caustic liquid). This could lead to severe chemical burns and if inhaled
- possible drowning. Proper handling procedures, pre-dive checks, dive techniques, and maintenance mitigates this
risk.
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WARNING: HIGH PRESSURE OXYGEN
The PRISM 2 uses cylinders, gas feed lines, pressure gauges and other devices which will contain pure oxygen at
high pressure when in operation. Oxygen by itself is non-ammable, however it supports combustion. It is highly
oxidizing and will react vigorously with combustible materials. Oxygen at elevated pressure will enhance a re or
explosion and generate a large amount of energy in a short time.
The user must maintain all parts of the PRISM 2 that can come into contact with high-pressure oxygen as oxygen-
clean components. This includes scheduled servicing by a Hollis service professional, and using approved oxygen-
compatible lubricants on any part of the gas delivery systems that will come into contact with high-pressure
oxygen.
If any part of the oxygen-clean system comes into contact with contaminants or is accidentally ooded with
any substance (including fresh water), you MUST have the entire high-pressure oxygen system serviced by an
authorized PRISM 2 service professional prior to use. Failure to do so can cause re or explosion and lead to
serious injury or death.
WARNING: DESIGN AND TESTING
The Hollis PRISM 2 has been designed and tested, both in materials and function to operate safely and consistently
under a wide range of diving environments. You must not alter, add, remove, or re-shape any functional item of the
Hollis PRISM 2. Additionally, NEVER substitute any part of the Hollis PRISM 2 with third-party items which
have not been tested and approved by Hollis for use with the PRISM 2.
This includes, but is not limited to, hoses, breathing assemblies, electronics, breathing gas delivery assemblies
and their constituent parts, sealing rings, valves and their constituent parts and sealing surfaces, latches, buoyancy
devices, ination and deation mechanisms and on-board alternate breathing devices.
Altering, adding, removing, re-shaping or substituting any part of the Hollis PRISM 2 with non-approved parts can
adversely alter the breathing, gas delivery or CO2 absorption characteristics of the Hollis PRISM 2 and may create
a very unpredictable and dangerous breathing device, possibly leading to serious injury or death.
Non-approved alterations to functional parts of the PRISM 2 will automatically void all factory warranties, and
no repairs or service work will be performed by any Hollis service professional until the altered PRISM 2 unit is
brought back into factory specications by a Hollis service professional at the owner’s expense.
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WARNING: COMPUTER / CONTROLLER-SPECIFIC WARNINGS
This computer is capable of calculating deco stop requirements. These calculations are predictions of physiological
decompression requirements. Dives requiring staged decompression are substantially more risky than dives that stay
well within no-stop limits.
Diving with rebreathers and/or diving mixed gases and/or performing staged decompression dives
and/or diving in overhead environments greatly increases the risks associated with scuba diving.
WARNING: COMPUTER SOFTWARE
Never risk your life on only one source of information. Use a second computer or tables.
If you choose to make riskier dives, obtain the proper training and work up to them slowly to gain experience.
Always have a plan on how to handle failures. Automatic systems are no substitute for knowledge and training. No
technology will keep you alive. Knowledge, skill, and practiced procedures are your best defense.
WARNING: WEIGHTING OF THE HOLLIS PRISM 2
Unlike open circuit scuba gear, it is possible for the Hollis PRISM 2 breathing loop to ood, causing the rebreather
to quickly become 17 pounds negatively buoyant (not including any user-added weight or offsetting buoyancy
ination). It is the responsibility of the diver to insure that the Hollis PRISM 2 is never weighted in such a way that
it is not possible for the installed buoyancy device to overcome the ooded weight of the unit plus any diver-added
non-detachable weights, and still provide enough positive buoyancy at the surface to keep the divers head well
above water.
Consult your instructor, dealer, or call the Hollis factory directly with any questions or concerns. Failure to maintain
positive buoyancy at the surface with the Hollis PRISM 2 in a fully ooded state can lead to serious injury or death.
WARNING: BAILOUT GAS
The diver must always carry bailout gas, that provides an adequate volume and safe breathing mix, to deliver the
diver safely to the surface from all points during the dive. Divers can and do die from underestimating their bailout
needs. The diver shall receive details, training, and materials on selecting appropriate gases, volumes, and bailout
equipment from their selected Hollis approved training agency and instructor.
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WARNING: USER-PACKED RADIAL SCRUBBER
As of this writing, the Hollis PRISM 2 design does not include any technology or other device which can detect
or warn of potentially dangerous levels of carbon dioxide (CO2) within the breathing loop.
The Hollis PRISM 2 utilizes a user-packed, radial design CO2 scrubber. Only Hollis tested and approved CO2
adsorbents should be used, and factory-stated maximum scrubber durations must NEVER be exceeded.
Exceeding factory stated scrubber durations for a tested material will eventually lead to serious injury or death.
It is entirely possible that, for any number of reasons including but not limited to: channeling, ambient
temperature, exhausted, damaged, inappropriately stored, or (for whatever reason), inert scrubber material, the
chemical and thermodynamic reaction required to sequester gaseous CO2 will not occur as expected, and a toxic,
and possibly fatal level of gaseous CO2within the breathing loop can result.
You must carefully follow all instructor and manufacturer recommendations for use and handling of CO2
adsorbent, never use a CO2 adsorbent if you cannot verify that it is able to sustain CO2 absorption and carefully
pack the radial scrubber and complete a system pre-breathe prior to each immersion, as you were taught in your
training course.
Further, you must carefully monitor yourself for any symptoms of possible CO2 poisoning whenever you are
breathing from the Hollis PRISM 2, and bail-out to open circuit should any physical or mental symptom lead
you to suspect elevated CO2 levels in your breathing loop. Failure to bailout at the rst sign of trouble can lead to
serious injury or death.
WARNING: NAUSEA AND THE BREATHING LOOP
The introduction of biological solids into the DSV/BOV can lead to obstruction of the critical mushroom valves
causing a situation whereby fresh gas is not being circulated to the diver and consequently, a buildup of CO2
in the diver. Additionally, nausea is a known symptom of improper gas mixture and/or contamination. During
operation of the Prism 2, should you begin to feel the onset of nausea, immediately switch to an appropriate open
circuit bailout as soon as you can perform the task safely, and abort the dive. Consult your PRISM 2 instructor for
further details/training.
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WARNING: PROPER BATTERIES
ONLY name-brand batteries (such as “Duracell” or “Eveready”) may be used to power the PRISM 2. Off-brand
or Discount batteries have been found to vary greatly in quality of materials from batch to batch (and even piece to
piece!) Therefore they may not perform as expected, or be capable of consistently delivering the power required to
drive the Prism 2 components, despite battery voltage levels reported by a battery voltage meter.
While off-brand / discount batteries are perfectly acceptable for use in toys and ashlights, they
have no place in life support gear and must never be used to power any component of your PRISM
2.
Because of the potential rapid drop-off of charge from rechargeable batteries, rechargeable
batteries are not recommended for use with your PRISM 2 rebreather and must not be used.
Diagram showing rapid discharge of non-branded batteries that in life support
gear can result in unnecessary hazards.
The full article, “Are Expensive Batteries Worth The Extra Cost?” is available
at Wired.com
Image courtesy of Rhett Allain, Wired
WARNING: OPERATIONAL RANGE
The PRISM 2 has been tested and qualied for use in water depths of up to 328 ft (100 m) and water temperatures
between 39° - 93° F (4° - 34° C).
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WARNING: COLD WATER
Diving rebreathers in frigid water requires special equipment, training, and preparation to prevent possible injury
or death. Closed Circuit Rebreathers present unique variables to cold water diving that are not a factor in open
circuit diving in the same temperatures. Cold water diving is beyond the scope of this manual. There are many
variables not listed here. It is essential and the responsibility of the diver to be aware of all issues. The diver must
know how to best prepare their equipment, and how to best prepare themselves for the cold water environment.
The diver must obtain further training beyond standard CCR training or Open Circuit Ice Diver certication alone.
Cold Water Issues Include The Following:
- Alkaline battery performance degrades as the temperatures decrease. If diving consistently in waters approaching
freezing, it is recommended to use lithium batteries.
- If using a BOV with a PRISM 2 in water colder than 50°F/10°C, you must use an approved Hollis PRISM 2
Environmentally Sealed Regulator First Stage for the diluent supply gas.
- Changes in temperature may lead to expansion and contraction of CO2 adsorbent material possibly leading to
channeling or damage to the adsorbent itself. Further, allowing the moisture in the adsorbent to freeze will mean
that CO2 adsorption may not occur.
- Decreases in temperature effect the efciency of the scrubber considerably.
-Sensors are sensitive to extreme temperatures. Storage of Oxygen Sensors below 32° F (0°) or above
100° F (37.8° C) can damage or greatly shorten the life of the sensor.
- Mushroom valves may freeze open or closed if condensation is allowed to cool. Always perform mushroom
valve (stereo valve) checks and pre-breathe the unit before entering the water and before any subsequent dives.
The diver should warm and visually inspect the mushroom valves between dives.
- Use of the manual addition valves should be limited to short bursts of less than 1 or 2 seconds at a time.
Prolonged valve activation may cause freezing of the mechanism in frigid waters due to adiabatic cooling.
Training Standards:
Hollis Rebreathers recommends rebreather training from a recognized training agency that meets or exceeds the
minimum standards set by the Rebreather Education Safety Association (RESA).
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TABLE OF CONTENTS
General Safety Statements & Warnings
PART 1
SYSTEM OVERVIEW
SECTION 1
DESIGN PHILOSOPHY
SECTION 2
SCHEMATICS + DESIGN
ARTICLE: TAKING CARE OF YOUR
OXYGEN SENSORS
ARTICLE: THE SOLENOID AND
THE PID CONTROLLER
SECTION 3
FITTING YOUR PRISM 2
ARTICLE: STABILITY
PART 2
SETUP
SECTION 1
AN O-RING CLEANING PRIMER
SECTION 2
PACKING THE PRISM 2 CO2 SCRUBBER
SECTION 3
USING CHECKLISTS
SECTION 4
COMPONENT INSPECTION CHECKLIST
SECTION 5
ASSEMBLY ORDER CHECKLIST
SECTION 6
PRISM 2 OPERATIONAL CHECKLIST
SECTION 7
POST DIVE CHECKLIST
SECTION 8
MAINTENANCE + REPAIR LOG
iii-viii PART 3
ARTICLE: MINIMUM, MAXIMUM AND
OPTIMAL LOOP VOLUMES AND WORK OF
BREATHING
PART 4
MAINTENANCE +
CLEANING
SECTION 1
SERVICE FACILITY & YOU
SECTION 2
ROUTINE CLEANING
PART 5
APPROVED PRODUCTS,
CAPACITIES, & SPECS
SECTION 1
LIST OF APPROVED PRODUCTS
FOR USE IN YOUR PRISM 2
SECTION 2
COMPONENT CAPACITIES + SPECS
SECTION 3
GLOSSARY
SECTION 4
NOTES
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