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Hollis Explorer User Manual

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REV. 6
N O
L I M I T

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  • Page 1 user Manual REV. 6 L I M I T...
  • Page 2 This is the operations manual for the HOLLIS EXPLORER U.S.patents have been applied for; patents pending. This manual, specifications and features of the Explorer are proprietary and copyright Hollis Inc., 2012. This document cannot be copied or distributed without the prior agreement and authorization from Hollis Inc.
  • Page 3 SCUBA apparatus. It is designed as a EXPLORER DESIGN TEAM guide for the proper setup, operation, maintenance, and field service of the Hollis Explorer only. It does Bob Hollis NOT take the place of a recognized training agency...
  • Page 4 WARNING: GENERAL SAFETY No person should breathe from, or attempt to operate in any way, a Hollis Explorer rebreather, or any component part thereof, without first completing an appropriate Hollis Certified user-training course. Further, no Explorer diver should use a Hollis Explorer without direct Hollis instructor supervision until they have mastered the proper set-up and operation of the Hollis Explorer rebreather.
  • Page 5 You must not alter, add, remove, or re- shape any functional item of the Hollis Explorer. Additionally, NEVER substitute any part of the Hollis Explorer with third-party items which have not been tested and approved by Hollis for use with the Explorer.
  • Page 6 Be aware that a well packed and well maintained Scrubber is key in achieving a life-support system. The Canister Duration Meter (CDM) is not a substitute for good system maintenance and Pre-Dive checks. Always use your training and discipline to ensure the sub-systems in the EXPLORER are oper- ating correctly.
  • Page 7 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 Explorer training or Open Circuit Ice Diver certification alone. Cold Water Issues Include The Following:...

  • Page 8: Table Of Contents

    TABLE OF CONTENTS SECTION 9 General Safety Statements & Warnings ii-vii BAILOUT & GAS CONFIGURATION PART 1 SECTION 10 YOUR NEW EXPLORER DCP (DIVE CONTROL PARAMETER) SECTION 1 SECTION 11 REBREATHER LIFE SUPPORT SYSTEM RMS(RESOURCES MANAGEMENT SYSTEM) RULES SECTION 12...
  • Page 9 PART 6 MANDATORY DIVING SKILLS SECTION 1 EXPLORER BASICS SECTION 2 IN-WATER SKILLS CHART SECTION 3 EXPLORER SKILLS COMPLETED PART 7 LONG TERM MAINTENANCE & SERVICE SECTION 1 SENSORS SECTION 2 SERVICE SECTION 3 MAINTENANCE SCHEDULE PART 8 APPROVED PRODUCTS &...

  • Page 10: Part 1 Your New Explorer

    2. Always pre-breathe the Explorer until the system passes its’ tests. 3. Do not modify the Explorer without the manufacturer’s written consent. 4. Do not use a full-face mask, unless approved by Hollis for use with the Explorer. 5. Always analyze your gas.

  • Page 11: Gas Flow

    GAS FLOW As the diver exhales gas flows through the hose (blue arrow) and over the right shoulder. It then enters the absorbent scrubber and flows across the Oxygen and CO sensors in the Sensor Module and through the inhale hose (red arrow) and back to the mouthpiece.

  • Page 12: Mechanical Features

    Please check www.HollisGear.com for details. HARNESS/BCD EXPLORER uses a custom bolt fitting, backplate, Solo webbing harness, and Hollis C45LX Wing. There is an optional EXPLORER BCD available. COUNTERLUNG The EXPLORER comes complete with dual back-mounted counterlungs (BMCL). These are attached to the canister by a screw threaded O-ring fitting.

  • Page 13: Fig. 1.1

    40 mbar to help control ascents. BOV (BAILOUT VALVE) EXPLORER comes with a BOV. The BOV is supplied by the onboard nitrox tank. The BOV is designed as the primary bail out (providing a sufficient/ planned volume is carried).
  • Page 14 These displays give full alarm status at all times using a visual and a tactile alarm system. SENSORS The EXPLORER uses 3 oxygen sensors and a wireless HP sensor. It can also be equipped with an optional gaseous CO sensor.

  • Page 15: Part 2 Unpacking Your New Explorer

    The user should keep the batteries fully charged to ensure there is always maximum battery charge for any dive. Additionally, the Optocon protective cap should be installed when the Explorer is not being charged. A fully charged battery pack will display 900 minutes of battery life on the wrist display.

  • Page 16: Initial Assembly

    Initial Assembly INTRODUCTION Your Explorer is assembled and tested at the factory. Some components are then removed to package the unit. When you receive your Explorer, the following components will need to be put together. GENERAL NOTES ON ASSEMBLY 1. All O-rings should be lightly lubricated.
  • Page 17 Case Back until the hinge at the top is free (Fig. 2.3). Place to one side. Step 8. Inside the Explorer case you will find a zippered case containing the LSS (Life Support System). Remove the LSS from its case. Unscrew the Optocon charging/download connector protection cap.
  • Page 18 Align the locking ring tab with the notch on the left side, when the Explorer case is laying on the harness side. Additionally, line up the solenoid, as shown (Fig. 2.8).

  • Page 19: Complete Disassembly & Reassembl

    Complete Disassembly & Reassembly INTRODUCTION The information below will enable complete disassembly, cleaning, rebuild- ing, and testing of the EXPLORER Rebreather. Further disassembly must be performed by a qualified Hollis EXPLORER Technician. GENERAL NOTES ON ASSEMBLY 1. All O-rings should be lightly lubricated.
  • Page 20 BOV REASSEMBLY & CARE • Clean the mushroom valve carrier O-ring and the groove around the mushroom valve carriers. Lightly lubricate and refit new O-rings. • Inspect the mushroom valve and mushroom valve carrier for damage. Sanitize and remove any debris from the carrier. •...
  • Page 21 • If a leak is detected from the mouthpiece outlet, then the barrel O-rings need replacing. • If a leak is detected at the hose ends, then replace the hose end O-rings. • If a leak is detected along the hoses, then refer to your Hollis dealer for hose replacement. BOV SECONDARY TEST In open circuit mode, with the second stage BOV (HP) gas turned OFF.
  • Page 22 • If bubbles come out of the mouthpiece there may be a leak in the barrel/ knob O-rings. They must then be replaced. EXPLORER LSS MODULE - DISASSEMBLY/ASSEMBLY • Remove the LSS Module by twisting the lock ring counterclockwise ½...
  • Page 23 • Refit the end cap by aligning the locking ring tab with the notch in the Explorer case on the left side, while pushing the end cap into the canister. Then turn the lock ring clockwise by 180 degrees to the opposite notch in the Explorer case.
  • Page 24 CANISTER – DISASSEMBLY/ASSEMBLY • Remove the counterlungs and hoses by unscrewing the hose lock rings, counterclockwise. Clean and inspect the sealing face for each end cap seal, hose ends, and counterlung ports. • Disconnect the LCV balance cap and tube from the exhale counterlung to the Canister at the counterlung (Fig.

  • Page 25: Fig

    NOTE: The HP Sender must be pressurized to activate. A closed tank valve could result in a HP Sender battery low indication DANGER: If you are in doubt as to the HP readings on EXPLORER, you must check it by attaching a normal gauge and hose to the HP post.
  • Page 26 • Connect the LP hose to the BCD inflator COMPLETE EXPLORER TEST Follow the on-screen pre-dive sequence. See PART 4 Section 2. If the unit fails the negative or HP leak test and the fault is not easily recognizable. Follow these steps: •...

  • Page 27: Life Support System (Computer)

    The Heads Up Display (HUD) feature gives a simplified and quick to follow view of the status of the EXPLORER. The HUD has 3 main warning levels: • Flashing Red plus vibration alarm - warning is activated when a dive should be aborted on open circuit or not started.
  • Page 28 With current technology, not all aspects of the safety and working nature of the EXPLORER system can be performed or determined automatically. Therefore, when turning on the EXPLORER, there are a series of pre-dive checks that must be performed. The EXPLORER gives guidance in per- forming these checks.
  • Page 29 STATUS screens in service mode, described in the PART 3 Section 6 of this chapter. The STATUS screen shows as soon as the EXPLORER is turned on (Fig. 3.1). In addition, Status screens can be viewed at any point in the dive by press- ing any button and selecting STAT from the pop-up menu using a short push of the right button.
  • Page 30 STAT will display the STATUS screen and relevant resources as during a dive. To enable fault diagnosis, put the EXPLORER into Service Mode. Having selected STAT with a long hold of both buttons from the Startup screen you will access two extra screens (Fig. 3.3, 3.4) (plus alarm and metric screens, not shown).
  • Page 31 - A major alarm indicating that information/resource has now become critical forcing an open circuit bailout or no dive condition. OC Bailout will be displayed on the STATUS Screen’s Action Panel and the HUD will flash red and a vibrating alarm will activate on the HUD. From the Main Dive Screen, two short presses of the right button will bring up the STATUS screen (Fig.

  • Page 32: Automatic Turn On

    AUTOMATIC TURN ON FAILSAFE FEATURE Normal practice and training is for the user to turn the EXPLORER on by depressing any button on the wrist display and going through the pre-dive checks. The following failsafe additions are to reduce the chance of acci- dental injury or death by breathing on an EXPLORER that is in off/sleeping state.

  • Page 33: Display Symbols

    Display Symbols Most screen commands (soft buttons) are actually the written word (in English) but movement commands are expressed using icons. Moves the cursor to the next field to the right to edit or moves the STATUS display one window to the right. Moves the cursor to the next field to the left to edit or moves the STATUS display one window to the left.

  • Page 34: Screen Icons

    HUD/BUD state. In addition, a grey icon indicates a test not yet performed. ! WARNING. A red icon means a failure of the test/alarm which if ignored would make EXPLORER unsafe to dive. The icons are: Battery & Computer...

  • Page 35: Dive Screens

    DIVE SCREENS Screen Description Dive Screen (when ascent rate bar is ½ full then rate is 30 ft/min 10 m/min Dive Time   Ascent Rate Dive Screen with menu bar (accessed by a single push of any button)   Status Screen (accessed by a short double push of the right button)  ...

  • Page 36: Status Screens

    status screens The Status (STAT) screens show all key resources in a simple format. The screen is accessed from the main screen by a short double push of the right button, and then a short push of either the left or the right button moves around the screen.

  • Page 37: Main Menu

    MAIN MENU MAIN MENU SCREEN (FIG. 3.7) The EXPLORER has a simple menu system which is available while at the surface. To access the Main Menu short press any button. MENU NAVIGATION   Action Button Press Fig. 3.7 Short push both buttons...
  • Page 38 ER, the serial number of each connected element, and information that may be required by your service center. Software updates for the EXPLOR- ER are available from http://hollis.com/support.asp. Please check regu- larly for updates. Once a new update has been installed, this screen will  ...

  • Page 39: Setup Menu

    For increasingly shorter dives, the logbook limit will increase to 28 (for dives < 10min). TIME/DATE This is the clock and calendar setting (Fig. 3.13). NOTE: When the EXPLORER is first powered up from a discharged   battery you will be asked to update the date and time. Fig. 3.13...
  • Page 40 LSS will be displayed. Once the system finds the transmitter, press PAIR. The word PAIRED will appear (Fig. 3.15). ! WARNINGS: The transmitter ID is written on the transmitter at- tached to the first stage in your EXPLORER (Fig. 3.16). Confirm this is the correct transmitter before proceeding.  ...
  • Page 41 Bailout and Gas Configuration DEFAULT GAS SETTING The EXPLORER has the capability to analyze the dive gas attached to the system. If this gas differs significantly from what the EXPLORER expects (the programmed Default Gas), then a warning will be given during the pre- dive sequence.

  • Page 42: Dcp (Dive Control Parameter)

    DCP (Dive Control Parameter) DYNAMIC PO The EXPLORER is a dynamic PO controller. This means it can vary the that it maintains based on the value of certain resources. A higher DCP (Dive Control Parameter) value means less tissue loading (higher ) but more gas usage and a lower PO is the opposite.
  • Page 43 HOW AUTO MODE WORKS By setting ‘Auto’ DCP prior to diving the following events occur. 1. The DCP will automatically be set to 95% for the first 10 minutes of the dive but only after the diver exceeds 10 m of depth. 2.
  • Page 44 RMS (Resources Management System) The control of PO is the prime function for EXPLORER. In addition it monitors a range of dive resources. The LSS is able to make advanced decisions based on available resources in order to modify the PO provide for the longest possible dive.
  • Page 45 Oxygen Sensor Calibration The EXPLORER is able to perform accurate calibration of the Oxygen (PO sensors in ambient air. This has particular importance on the ease and accuracy of achieving calibrated sensors. The EXPLORER is able to measure atmospheric pressure during calibra- tion and make the appropriate calibration adjustments for the sensors.
  • Page 46 NO OTHER GAS. Oxygen sensor calibrations conducted once a week should be more than sufficient, unless the EXPLORER has been transported to different climates, locations, or significantly different ambient conditions. Prior to starting a pre-dive sequence it is advisable to check the oxygen...

  • Page 47: Sensor Calibration

    20.9% oxygen at 750 mbar = 15.675 mbar partial pressure of oxygen The EXPLORER uses ambient air as the calibrating gas, because its composition is accurately known. This is in contrast to say a cylinder of compressed oxygen that can vary from supplier to supplier, as well as around the world, from at least 94% to 100%.
  • Page 48 The Oxygen sensors vary only slightly over time. Temperature, atmospheric pressure and moisture have far greater short-term effects on the readings. Calibrations carried out once a week should be more than sufficient, unless the EXPLORER has been transported to different climates or significantly different ambi- ent conditions.
  • Page 49 Sensor Module should be re- moved from the EXPLORER and sensors allowed to stabilize in ambient air. 6. If the EXPLORER has had a change in climate or significant ambient conditions, these are good reasons to check calibra- tion.
  • Page 50 OXYGEN SENSOR VOTING VOTING METHOD The EXPLORER has a method of automatically removing Oxygen sensors from the PO averaging and entering a fail-safe mode when it is not possi- ble to resolve an inaccurate PO reading. NOTE: It is never wrong to bailout in response to a misunderstood unit failure.
  • Page 51 5. If the difference between the highest sensor and the lowest is greater than 0.5bar then the system will inject gas for 1 second out of every 3 as a fail-safe. This will cause an ASCEND NOW alarm. Mandatory Diver Action: Ascend to surface on the rebreather. Rebreather switches to Fail-Safe Mode.

  • Page 52: Cdm (Canister Duration Meter)

    Flooding, extended storage between uses, improper assem- bly, and improper packing can all contribute to the canister duration meter reporting false readings. Use great care in assembling the Explorer and in completing pre-breathe checks on the breathing loop. The CDM is a useful feature as an aid to predicting absorbent duration.
  • Page 53 The CDM is not a sub- stitute for good system maintenance and Pre-Dive checks. Always use your training and discipline to ensure the sub-systems in the EXPLORER are operating correctly. Critical components and potential failures are: • The scrubber seal around the scrubber •...
  • Page 54 Using these principles, the system measures the amount of gas injected by the solenoid valve and converts it to a percentage of minutes remaining at CE CO rates. Although the displayed minutes are at CE CO generation standards, the minutes will tick down more slowly if the diver is breathing at a reduced rate.
  • Page 55 CO could still bypass the scrubber. If this occurs, stop breathing on the EXPLORER. This will be indicated (and alarmed for) by the optional Gas- eous CO sensor accessory. Replace the absorbent and/or check scrubber packing and seating.
  • Page 56 It is your life being supported - respect the equipment and its limitations. OPTIONAL CARBON DIOXIDE SENSING MODULE The EXPLORER is designed with an option to fit a CO sensor. The user can elect to buy this initially or upgrade to the sensor later.

  • Page 57: Display & Alarm Systems

    Display & Alarm Systems HUD, BUD, & COLOR SCREENS The EXPLORER can be routinely dived by using the HUD (Heads Up Display) as the main underwater human interface. This frees up the diver to concentrate on the dive at hand.
  • Page 58 ALARM CODES With the EXPLORER, a key task has been to process the fault levels and error conditions to indicate the status of the rebreather. Further, the LED states are configured for color blind as well as highly stressed divers.
  • Page 59 There are 3 main warning levels associated with the HUD, BUD, and on-screen displays. Alarm Code Meaning Correct Action Solid Green This code means there OK - Procede with dive are no detected prob- as planned. lems. Flashing Green & Blue Warning - It is activat- The correct response (HUD/BUD)

  • Page 60: Alarm Flow Diagrams

    Alarm flow diagrams The following sections contain flow diagrams to indicate which actions / HUD indication will be used separated into diving and surface cases. The following flow charts should be used in sequence, where an OK from the red HUD alerts lead to blue/green HUD alerts. Note the following alarm states (used in the diagram): No Comms —...
  • Page 61 IN WATER HUD/BUD ALARMS Red (OC Bailout) Alarms   | 53...
  • Page 62 Blue/Green Alarms   54 |...
  • Page 63 "Bad Cell" States Are As Follows: • Cell input timed-out • Cell input stale • Calibrated sensor input > 3.00 bar • Calibrated sensor input < 0.15 bar • Raw sensor input < 7 mV • Cell input excluded having failed calibration •...
  • Page 64 SURFACE HUD/BUD ALARMS Red (Do Not Dive) Alarms   56 |...
  • Page 65 "Bad Cell" States: • Cell input timed-out • Cell input stale • Calibrated sensor input > 3.00 bar • Calibrated sensor input < 0.15 bar • Raw sensor input < 7 mV • Cell input excluded having failed calibration • Calibrated cell input > 0.2 bar from the other two cells (only a single cell can be in this state) "Do Not Dive"...
  • Page 66 Blue/Green Alarms   58 |...
  • Page 67 Blue/Green ‘Do Not Dive’ alarm states are: High If 2 or 3 cells in state “OK” and average PO ≥ 1.6 bar V. High Control If 2 or 3 cells in state “OK”, and provide complete, and PO ≥ 0.70 bar V.
  • Page 68 Action will follow None Usable Green System OK None. Stay on Onboard, 3 loop EXPLORER sensor driven Bad sensor Usable Blue/ Y – Fail- STATUS screen action Stay on EX- loop Green safe mode panel will show AS- PLORER and CEND NOW.

  • Page 69: Gas Reserves

    Gas Reserves DYNAMIC RESERVE The EXPLORER monitors the high pressure (HP) contents of the onboard gas supplies. The EXPLORER includes two warning system for the HP contents. 1. Pressure below reserve level. 2. Rate of use of gas is too high or too low indicating either a leak or that the HP cylinder valve is turned off and gas injection is being unsuccessfully attempted.

  • Page 70: Mod (Maximum Operating Depth)

    3. When a maximum PO of 1.6 bar is reached. The EXPLORER will not freeze the user out of operation if these depths are exceeded. However, the system and diver are operating beyond the normal recommended conditions and therefore these limits should never be routinely exceeded.

  • Page 71: Diving At Altitude

    The Explorer is fitted with a digital depth sensor. For it to accurately gauge altitude and preceding dive depths, the Explorer must be turned on prior to diving. This is the normal process as a predive must be conducted. It becomes especially important if you have transported the Explorer to a change in surface altitude.

  • Page 72: Deco Contingency

    ! WARNING: Decompression diving significantly increases the risk of decompression illness. Various alarms will be generated if elements of decompression are vio- lated. Please see the Deco States Table below and the EXPLORER flow charts for further detail. DECO STATES...

  • Page 73: Internet Reprogramming

    Contact the manufacturer web site or your dealer for more information. To check if you’re EXPLORER has any available updates and to obtain the reprogramming software, go to http://hollis.com/support.asp. DANGER: After new software is installed you MUST recalibrate the oxygen and CO sensors.

  • Page 74: Getting Ready To Dive

    A weight of up to 2-3 kg/4.4-6.6lbs can be used. If the EXPLORER is allowed to move on the diver's back, a change in breathing resistance may be noted. With the Explorer’s back mounted counterlungs it is important that the Explorer is as close to the diver’s back...
  • Page 75 ‘mixed teams’ (open circuit/closed circuit). Please check with your agency for details. The following is offered as a guide when configuring the EXPLORER for a range of diving conditions. This must be used in conjunction with the recommendations from your Hollis approved training agency.
  • Page 76 ADJUSTING THE BREATHING ‘FEEL’ − The breathing ‘feel’ of EXPLORER is partially controlled by the LCV. Having removed the case cover this can be seen underneath the Canister. This is an adjustable valve (over a small range). Oriented as shown, moving the valve left (Fig.
  • Page 77 The ADV is designed to help maintain a breathable lung volume in conjunction with the LCV. The ADV on the Explorer is a simple tilt lever system that in the relaxed position (no gas applied) will remain open. It seals when gas is applied.
  • Page 78 Other- wise, the LP hose will obstruct closure of the case. DANGER: Although the EXPLORER will analyze its own gas supply it is still important that you always analyze your gas prior to use.

  • Page 79: Co 2 Absorbent Scrubber Pack

    CO injection rate of 1.6 l/min and a ventilation (breathing rate) of 40 l/min and a 1.5 kg/3.3 lbs absorbent load of a Hollis Approved absorbent (See PART 8 Section 1), the unit will last 40 minutes at 40 m/130 ft as an extreme test (Ref EN14143: 2003).
  • Page 80 ! WARNING: These tests were conducted using Hollis approved absorbent, and durations can only be duplicated using such. DO NOT use any other type of absorbent with the EXPLORER. Safety data on absorbent products can be found at their respective brand websites.
  • Page 81 HANDLING ABSORBENT ! WARNING: CO absorbent may cause burns to eyes and skin. First aid treatment is as follows: • Inhalation. Remove from exposure. Seek medical attention. • Skin Contact. Drench with clean water and seek medical attention if skin becomes inflamed.
  • Page 82 The scrubber should always be kept sealed until required for use. With scrubber installed and not being used, the EXPLORER should have its breathing loop closed. This is so that external air does not accelerate the degradation of the scrubber.

  • Page 83: Pre-Dive Setup

    Having assembled and tested the unit upon receipt, it is still critical that all pre-dive tests are conducted prior to diving. The EXPLORER is equipped with a set of pre-dive checks that are built into the electronics prompting the diver to test certain aspects of the unit prior to diving.
  • Page 84 The complete sequence is detailed on the following page. This sequence assumes The unit has been powered on for 30 seconds, all tests pass OK, and no Pre-dive has been conducted within two hours. An APP for any Android device is available at http://hollis.com/support.asp. 76 |...
  • Page 85 Title subtitle     | 77...
  • Page 86 At the end of a successful Pre-dive sequence you will see the check resources screen (Fig. 4.5). At this point you should cycle through the screens by pressing the left or right button to check that all resources are adequate to com- plete the dive.
  • Page 87 Message Meaning sensor(s) unable to calibrate or failed LSS/Sensor Module. Recharge unit and try again. Return to dealer if problem persists.   Negative test failed. Ensure Cyl- inder is attached. Ensure Mouth- piece is fully in OC mode. Fill loop until vent valves exhausts then attempt negative test again.
  • Page 88 Message Meaning Wireless HP sender battery is low.   Analyzed gas is not what is expected by the DEFAULT GAS setting. Analyze gas and check setting.   The LCV and OPV are not vent- ing at the correct pressure. Flush valves with fresh water and repeat test.
  • Page 89 15 minutes it will automatically turn off to save power (Fig. 4.7). To manually turn off EXPLORER then select the Menu option and do a long press of the left button - OFF (Fig. 4.8).

  • Page 90: Part 5 Post Dive

    SANITIZING After a dive the Explorer breathing loop needs to be sanitized. The recom- mended sanitizer for the Explorer is Steramine™. This sanitizer is available through your Hollis dealer. Please see www.Steramine.com for Safety and Handling Instructions.
  • Page 91 Items to be sanitized are: • The BOV and hoses • The counterlungs • The canister tube and all its internal components ! WARNING: You MUST make sure you read the Material Safety Data information before using. The hoses should be removed and Steramine™ solution should be flushed through the complete assembly and allowed to drain out.
  • Page 92 Mandatory Diving Skills Explorer basics The primary diving skills required to use the EXPLORER will be covered in your chosen agency's training program and will not be reviewed here. However, there are certain unit-specific skills, which must be covered during your training course. These are detailed below.
  • Page 93 Water is allowed to then move into the top of the exhale counterlung. This is acceptable for the following reasons: 1. Water entering the counterlung is forced out again by through LCV system. 2. A small amount of water will not affect the CO absorbent performance.
  • Page 94 be nurtured by making the experience as informative, fun, and as exciting as possible. Only then will the subject matter and key survival skills be remembered. As in all training, while certain skills must be mastered first before the student can progress safely to the next level, there are always issues that affect the training sequence.

  • Page 95: In-Water Skills Chart

    Calibration of Complete calibra- To confirm calibra- Explain sensor Explorer tion of O & CO tion of all sensors calibration rules sensors. on primary elec- in manual, impor- tronics with air CAL tance of sensor po- sequence.
  • Page 96 18 m/60 ft. correctly weighted of the EXPLORER. Practice use of the to maintain depth Additional weight is BOV and external control under all needed to com- bailout.
  • Page 97 SMB followed ancy and monitor tionship between by a safe ascent, displays, while changes due to stopping at 6 m/ 20 tasked with SMB ascent and buoy- ft, while using the deployment. ancy changes. EXPLORER. | 89...
  • Page 98 Using the Simu- To understand the lator APP and the set-up menus of the display, understand EXPLORER the surface menu’s Gas share with a User demonstrates To practice deploy- Stay on the EX- buddy gas sharing with a ing and receiving PLORER.

  • Page 99: Explorer Skills Completed

    Explorer Skills - Completed DRY SKILLS Student Instructor 1. Management of O-rings Student Instructor 2. Assemble the unit Student Instructor 3. Proper dive planning Student Instructor 4. Post dive care Student Instructor 5. Complete Explorer Exam (with a minimum score of 80%,...

  • Page 100: Part 7 Long Term Maintenance & Service

    Long Term Maintenance & Service Oxygen Sensors APPROVED OXYGEN SENSORS The EXPLORER is only approved to use Hollis EXPLORER Oxygen Sen- sors. Hollis EXPLORER Oxygen Sensors have temperature ranges as detailed below. Operating temperature range: 0 – 40 °C Storage temperature: -20 to +50 °C Recommended storage temperature: +5 to +15 °C...
  • Page 101 • Check the sensor membrane. A certain amount of moisture will always appear on and around the sensors. If you suspect excessive water has made contact with the sensor faces. Remove excess water carefully with a paper tissue and leave to dry in a warm area. If the jack socket on the sensor is wet, the sensor may be damaged, as the electronics inside the sensor will also be wet.

  • Page 102: Service

    SERVICE Your instructor will educate you on what you the end user can service yourself. For all other service needs your Hollis Explorer Technician has been trained in the proper skills to service your your Hollis equipment. Always follow the Maintenance Schedule at the end of this chapter to keep your EXPLORER in peak condition.

  • Page 103: Maintenance Schedule

    Maintenance schedule KEY: E = before every dive A = annually C = at canister change 30 = 30 hours Item User (U) or Inspect/Clean Replace/ Notes Dealer (D) Service Mushroom valves annually or sooner if damaged Quad seal annually or sooner if damaged sensor silica E (inspect)
  • Page 104 Item User (U) or Inspect/Clean Replace/ Notes Dealer (D) Service LCV assembly Wash at end of dive annual or sooner if Fresh water flush day. damaged after dive trip. Wash at end of dive annual or sooner if Flush with fresh day.

  • Page 105: Part 8 Approved Products

    Tribolube 71® DeoxIT® Gold GN5 Electrical Contact Cleaner Other products not listed may be appropriate for use with the Explorer. If there is a particular product which you wish to use, please call the factory to make sure the product does not contain chemical components which may be harmful to components within the rebreather or the diver.

  • Page 106: Glossary

    *(The use of the word diluent is a misnomer carried over from a component used in closed circuit rebreather diving that operates in a similar fashion. In the Explorer the ADV does not dilute the gas but instead enriches with nitrox gas.)
  • Page 107 : oxygen OC: open circuit Optocon: The wireless transmission system used in Explorer to send data between the LSS and Sensor Module. Oxygen Sensor: galvanic oxygen sensors OPV (Over-Pressure Valve): a mechanical valve that vents gas to prevent breathing loop- component rupture.
  • Page 108 United States Naval Sea Otters and other marine life in Monterey Surface Warfare Command, developed Bay. In 1970, Hollis made some of the first and delivered a unit called the “ATUBA” dives on the Electrolung rebreather using...

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