Divesoft CCR Liberty Manual
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Divesoft CCR Liberty Manual

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Summary of Contents for Divesoft CCR Liberty

  • Page 1 Liberty MANUAL...

  • Page 2: Table Of Contents

    Responsibility of the CCR Liberty user . . . . . . . . . . . . . . . . .
  • Page 3 1 .7 Diluent tank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 1 .7 .1 Tank .
  • Page 4 2 . 4 .2 Setpoints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 2 .
  • Page 5 2 .12 .2 High priority . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66 2 .12 .3 Medium priority .
  • Page 6 3 . 4 .6 Water entry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 3 .

  • Page 7: Introduction

    This user manual is part of the CCR Liberty documentation . The CCR Liberty is intended to be used exclusively by a trained person who is capable of fully understanding the instructions contained in this manual or is in the process of training with the CCR Liberty in a course accredited by the manufacturer .

  • Page 8: Documentation

    Version The technical documents are subjected to a process of continual development and improvement . Therefore, please regularly check the website at www .divesoft .com for updates . This manual provides operating instructions for the hardware and software (firmware) version of the CCR Liberty written on the tittle page .

  • Page 9: Technical Data

    100 m . Water temperature limits The CCR Liberty is intended for use in water temperatures above 4 °C and below 34 °C according to the requirements of EN 14143:2013 (Article 5 .1) .

  • Page 10: Weight

    6 hours for a minimal working dive . For details see 78 Sorbent service life . Weight The total ready-to-dive weight of The CCR Liberty (including scrubber), is approx . 37 kg . For details see 31 Weights of individual parts .

  • Page 11: Technical Design

    1. Technical design...

  • Page 13: Basic Schematic

    1.1 Basic schematic Control units Rechargeable batteries Solenoid He % valves Buddy sensors display ppO sensors Pressure & temperature sensors CO absorbent Diluent Oxygen Exhalation Inhalation Dive/surface reduction reduction valve valve valve Manual diluent valve Manual oxygen valve Water trap Overpressure valve The principle of a rebreather involves in recycling the breathing mixture .

  • Page 14: Dive/Surface Valve

    1.2 Dive/surface valve The breathing mixture is delivered to the dive/surface valve (DSV) through the corrugated hose from the left . When inhaling, the mixture passes through the inhalation valve to the mouthpiece and then into the diver’s respiratory tract . When exhaling, it passes through the exhalation valve into the corrugated hose on the right .

  • Page 15: Mouthpiece

    Closing the dive/surface valve If the diver is in the water and not using the DSV, the DSV must be closed . Otherwise, the circuit will become flooded with water . Closing the DSV is done by using the gate handle situated on the front part of the DSV .

  • Page 16: Corrugated Hoses And Accessories

    . Do not treat the hoses like a hanger . The corrugated hoses are one of the least durable mechanical parts of the CCR Liberty . Pay appropriate attention to protecting and maintaining them .

  • Page 17: Attachment Of The Dsv

    1.4 Inhalation bag The inhalation bag is mounted on the left side of the harness (from the diver’s perspective when wearing the CCR Liberty) . The external cover is made from a resilient textile, ensuring mechanical protection . The internal bag is made from polyurethane . It is connected to the breathing circuit with a T-piece via the upper bulkhead with a bayonet connector .

  • Page 18: Manual Diluent Bypass Valve

    1.4.2 Manual diluent bypass valve The manual diluent bypass valve is situated in the lower bulkhead of the inhalation bag and is equipped with a bayonet connector . The valve is attached to the low pressure (LP) hose with a seatec-style quick-release connector . It is operated by pressing the center button .

  • Page 19: Overpressure Valve

    1.6 Oxygen tank 1.6.1 Tank The CCR Liberty uses a three-liter steel tank with 100 mm diameter and has a 200 bar filling pressure . The original 300 bar filling pressure of the tank was changed according to valid technical standards .

  • Page 20: Valve

    1.7 Diluent tank 1.7.1 Tank The CCR Liberty uses a three-liter steel tank with 100 mm diameter and 230 bar filling pressure . The original 300 bar filling pressure of the tank was changed due to utilizing a 230 bar valve .

  • Page 21: Backup Regulator (Optional)

    However, it is advised to use the bailout only in special circumstances, such as when diving in extremely shallow water . 1.8 CO scrubber The CCR Liberty uses a radial scrubber . The breathing mixture flows from the outside to the center of the scrubber cartridge . The scrubber apparatus consists of a scrubber cartridge inserted into a scrubber canister .

  • Page 22: Control Units

    When mounting the head, push the scrubber-canister pin into the corresponding indention on the lower part of head, pushing down to seal it . If it is difficult to remove the head, place the rebreather on a hard surface with the pin pointing downwards, as shown in the illustration .

  • Page 23: Direct Measurement Of Ppo

    . Choosing to manually exclude a sensor always has priority over an automatic detection of a faulty sensor . If all sensors are excluded, the CCR Liberty can be switched to a backup algorithm with calculates the partial pressure of oxygen indirectly based off the measured the He content (assuming the used diluent contains >20% He) .

  • Page 24: Measurement Of He Content

    . This method is intended for use only in emergency situations . If possible, use a bailout apparatus . The use of helium sensors also depends on the CCR Liberty’s settings . For the helium sensor function, the “TMX only” must be selected by going to Menu / Setup / Preferences / He Measurement .

  • Page 25: Helium Blind Plugs

    Included in your CCR Liberty are two helium sensor “blind plugs” . These plugs are designed to act as a spacer so that the user can remove the high-fidelity sensors . The Divesoft helium sensors are highly sensitive to moisture and can be easily corrupted if the moisture is not removed through proper ventilation .

  • Page 26: Pressure And Depth Measurement

    Liberty rebreather system . 1.9.5 Pressure and depth measurement Each of the CCR Liberty’s control units uses dual pressure sensors . The first sensor intended for measuring low pressure is used for determining sea level, for calibrating of the ppO sensors, and for improving the accuracy of depth data in shallow water .

  • Page 27: Visual Display Units

    The buddy display (BD) shows whether the values of the partial pressure of oxygen are within the range that is suitable for breathing or if an error situation has occurred . The displayed information is intended for the diving partner of the CCR Liberty’s user .
  • Page 28 Prior to diving, the user of the CCR Liberty must familiarize his/her diving partner with the buddy display’s functionality and agree on the emergency procedure to be carried out in the event that the buddy display indicates an error situation .

  • Page 29: Backplate And Mounting

    1 .6 Indicated ppO value in the range ±0 . 0 5 bar 1.11 Backplate and mounting The method of mounting the CCR Liberty on the diver’s body is based on the backplate and harness common among wing-type buoyancy compensators used in technical diving .

  • Page 30: Harness

    . Always secure the standing rebreather to prevent falling . If needed, it is possible to remove the CCR Liberty’s backplate, and use it with a harness for open-circuit diving . The backplate enables the attachment of a twin-set (two tanks firmly connected with stainless steel bands) commonly used in technical diving, as well as attachment of a single tank .

  • Page 31: Buoyancy Compensator

    Test the exact position of the rear D-ring in the water with the complete apparatus . 1.13 Buoyancy compensator The CCR Liberty uses a wing-type buoyancy compensator (BCD) with a displacement of 200 N . The compensator’s design and materials are very durable and even suitable for cave and wreck diving .

  • Page 32: Weights Of Individual Parts

    A diver in a dry suit typically needs 2×4 kg of ballast . Proper ballast weight and distribution is a subject covered in the CCR Liberty diver course . 1.15 Weights of individual parts The listed weights are merely an indication . The weight of the parts of each apparatus may vary .

  • Page 33: Control-Unit Operation

    2. Control-unit operation 2.1 Control elements All electronics in the CCR Liberty are controlled via the handsets . The following inputs and combinations are distinguished by: — Press upper key — Press lower key — Press both keys — Long press upper key —...

  • Page 34: Dive Mode Inputs

    Press upper key — select menu item Press lower key — scroll through the menu Press both keys — exit the menu without performing any action Long press upper key — page up Long press lower key — page down Long press both keys —...

  • Page 35: Language

    . 2.2 Switching on the unit Switching on the CCR Liberty’s control unit requires it to be in standby mode, which is indicated on the HUD (slowly flashing blue LED) and the buddy display (slowly flashing green LED) .

  • Page 36: Surface Mode

    2.3.1 Entering surface mode The CCR Liberty switches to surface mode when turned on by pressing the keys . In the water, surface mode can be selected in the menu if the depth is less than 1 .5 m .

  • Page 37: Surface Mode O

    Battery symbol A graphical indication shows the remaining battery capacity . The two batteries are indicated separately . The battery is full Bar height is proportional to the remaining battery capacity Color is changed at less than half capacity Plugged into a charger Setpoints Descent (“- .--“...

  • Page 38: Ppo Control In Surface Mode

    . sensors must also be installed and calibrated . It is advised for the user to avoid excessive physical activity prior to diving on the CCR Liberty, as doing so may cause a higher consumption of oxygen .

  • Page 39: Editor Use

    The factory default setting values are indicated by square brackets . 2.4.1 Editor use Most of the values are edited in a similar manner . Tilt toward yourself— decrease the digit by one or uncheck box . Tilt to the left — move the cursor to the left Tilt to the right —...

  • Page 40: Mixtures

    high [1.3 bar] Value of the high setpoint (range: 0 .7—1 .6 bars) . See also 56 Setpoint . limit [90%] The setpoint is limited to the percentage of ambient pressure (range: 60—96%) . Setting a percentage that is too low reduces the effectiveness of decompression in shallow depths .
  • Page 41 Each mixture can be enabled (marked checkbox) or disabled (clear checkbox) . This can be done in the editing screen or via a shortcut – long press of the upper key in the list of mixtures . Next to every gas mix MOD and END is displayed . MOD is calculated in a way in which the diluent will always be able to dilute the mixture in the loop .

  • Page 42: Decompression

    Unused gas mixes must be disabled . Otherwise, the gas management calculations or BO RMT will be skewed . In an emergency, a mixture can be enabled or even newly defined during a dive . However, this shoud be reserved for emergency situations only . Def.
  • Page 43 to the Bühlmann decompression algorithm without an additional increase in safety using the gradient factor method . Setting low values leads to deeper and longer stops at the start of decompression . GF high [0.80] Gradient factor at the end of decompression (range: 0 .10—1 . 0 0) GF high determines an additional increase in safety when ascending to the surface .

  • Page 44: Alarms

    . A diver that uses the CCR Liberty after resetting the decompression data should not dive for 48 hours prior to submersion with the reset apparatus . Do not dive for 24 hours with a reset apparatus after significantly increasing altitude above sea level .
  • Page 45 Notifications No deco end [On] End of the dive in zero time (Bühlmann decompression model terminology), i .e . notification that it will be necessary to reduce the ascent rate and/or perform decompression stops . Gas switch reminder [Off] The alarm advises the user to switch to a different mix .

  • Page 46: Preferences

    Stack timer sfc. This feature can be set to not count stack time when in surface mode . On – counted on the surface Off – not counted on the surface 2.4.6 Preferences Display Orientation Setting for left/right hand . Screensaver The display becomes inactive after a set period of timer (range: 0—120 s) .

  • Page 47: Calibration

    Minimum key press duration (range: 1 — 5, in 100 ms) . Auto switch off This represents the time period after which the CCR Liberty switches from surface mode to standby mode (range: 0 — 999 min .) . 0 deactivates automatic switching to standby mode . If no handset is connected, a switch-off will occur after 150 minutes regardless of the setting .

  • Page 48: Faulty Sensors

    Do not use air for calibration . The partial pressure of oxygen in air at atmospheric pressure differs significantly from the partial pressures determined by the setpoints . At the end of its service life, an oxygen sensor can successfully undergo calibration to 21% (air) but will no longer be capable of measuring a ppO of 1 bar or higher .

  • Page 49: Miscellaneous

    Pressure sensors This is the pressure sensor status overview . Based on the results, the user may have to manually exclude individual sensors . Do not start a dive with more than one malfunctioning pressure sensor . Normal – no sensor malfunction detected; the sensor is used as a data source . Disabled –...

  • Page 50: Dive Mode

    Factory defaults This resets all settings to the default values . Following a reset, make sure to change all necessary settings before a dive . 2.5 Dive mode 2.5.1 Detailed screen The primary screen displays all necessary information during a dive . Most information is provided by clear values and unambiguous symbols .
  • Page 51 Ceiling The depth of the decompression ceiling decreases continuously up to the surface . The stops displayed are never random . Always stay below the depth of the ceiling, even if the ceiling depth is very shallow . The ceiling indicator in the Liberty replaces the indicator of decompression stops . The diver selects the depth at which they do the decompression stop or steadily ascends in accordance to the decompression ceiling .
  • Page 52 Permitted to ascend to the surface . Permitted to ascend to the depth of the decompression stop or decompression ceiling . The depth of the decompression ceiling or decompression stop has been reached; do not change depth . The depth of the safety stop has been reached; do not change depth . The ascent rate has been exceeded;...

  • Page 53: Synoptic Screen

    the maximum FO . For instance, a setpoint of 1 .3 in 3 meters can be reached, but only if there is 100% of oxygen in the loop, but if the FO is set to 80% then the setpoint will be displayed in yellow, and the solenoid will not add oxygen for as long as the value of ppO does not drop below 1 .

  • Page 54: Dive Profile Screen

    2.5.4 Dive profile screen Start The time of submersion is useful for checking compliance with the schedule . The average depth is indicated with the yellow horizontal line and with a number displayed in yellow . Current depth See lower left corner . Dive time Runtime of current dive is placed in lower right corner .

  • Page 55: Tts Screen

    . 2.6 CCR mode This is the primary dive mode with the CCR Liberty . 2.6.1 Entering CCR mode The standard method of switching to CCR mode is by selecting it in the menu from surface mode .

  • Page 56: Switching To Other Modes

    The process of switching to dive mode has the following course . By choosing dive mode, oxygen injection is started immediately based on the current partial pressure of oxygen and setpoint settings . At the same time, oxygen sensors are automatically verified, and their calibration is checked .

  • Page 57: Ppo Regulation

    2.6.3 ppO regulation The basic function of the CCR Liberty is to maintain correct partial pressure of oxygen . A predictive algorithm of ppO control is used . Measured ppO is adjusted according to the mathematical model of the breathing loop . The calculation of O delivery and possible subsequent opening of the solenoid is performed at six-second intervals .
  • Page 58 The descent setpoint is automatically switched to the low setpoint upon reaching that value or upon completing or significantly slowing down the descent, but no later than after ten minutes . When using the descent setpoint, the user must continuously check whether he/she has reached or exceeded the maximum physiologically permissible ppO limit and adjust the rate of descent accordingly, or take other measures .

  • Page 59: Decompression

    . During a dive, the safety level can be set in the menu by switching the set of standard and bailout gradient factors (GFs) without affecting the mode in which the CCR Liberty is operating . 2.6.5 Specific handset control Long press upper key —...

  • Page 60: Decompression

    If the ppO falls below 0 .3 bar, then oxygen will be added to the breathing loop automatically for safety reasons . This is possible only if the solenoids are operational and an oxygen supply is available . When manually adding oxygen to the breathing loop, anticipate a delay between adding oxygen and the change in measured values .

  • Page 61: Decompression

    (GFs) . It is possible to switch between the standard and bailout GF sets in the menu without affecting the mode in which the CCR Liberty is operating . If the diver switches back to the CCR mode during the dive, the GF automatically switches back to Standard GF .

  • Page 62: Setup In Dive Mode

    available mixes), or with the current mix only . Details of settings are in Chapter 3 .1 .1 Planner settings – page 75 . 2.10 Setup in Dive mode During the dive, many preconfigured factors can be changed, such as setting a new temporary setpoint, adding a new mix, removing a lost mixture, changing the diluent, or adjusting the brightness of the display or HUD .

  • Page 63: Games

    including all sensors is the same as the procedure in the surface mode – see 47 Faulty sensors . Bailout GF Bailout gradient factors are used to accelerate decompression during an emergency . This reduces the safety margin to the acceptable minimum time for a safe ascent to the surface . Once the device is switched to Bailout GF, this item changes to Standard GF, which then can be used to switch back to standard gradient factors .

  • Page 64: Sokoban

    Make sure you maintain your position while playing during a dive . Check the pressure gauges and rebreather state on the second handset on a regular basis . Playing a game will reduce your attention . Remember: you want to dive safely, not just achieve a higher level in the game! 2.11.1 Sokoban Sokoban is a type of transport puzzle, in which the player (a diving mask with snorkel) pushes tanks or...

  • Page 65: List Of Pop-Up Alarms And Notifications On Liberty Ccr

    2.12 List of pop-up alarms and notifications on Liberty CCR This is exhaustive list of all possible alarms and messages displayed as a pop-up on the Liberty CCR handset . Messages are categorized according to priority, the “Critical”, “High” and “Medium” are all some kind of a failure or diver error .
  • Page 66 Customization Setup / Alarms / Alarm Sources / Max pO [1 .6] Setup / Mixtures / Max pO bottom [1 . 4 ] Setup / Mixtures / Max pO deco [1 .6] Please note that internally the "Setup / Mixtures / Max pO deco"...

  • Page 67: High Priority

    2.12.2 High priority Check O sensors ! This alarm occurs only if you have one or more oxygen sensors excluded, but not manually disabled . Alarm is triggered once an automatically excluded sensor exceeds the threshold for high ppO alarm (see section “Critical”) . This message is a clear signal for performing a sensors validation, usually by diluent flush .
  • Page 68 If you want to avoid automatic inclusion of the once excluded sensor, then you can manually disable it . Customization Manually disable and enable sensors: Setup / Faulty sensors / Oxygen sensors Pressure #1 excluded Liberty uses four sensors in total, two for each computer unit . So, although extremely rare, you may see this message .
  • Page 69 CNS O toxicity 115% The oxygen toxicity alarm sounds in three stages, at 75%, 90% and 100% . To notify the diver that he is reaching the NOAA oxygen exposure limit . If you need to prolong your stay underwater, reaching the CNS limit, you can lower the setpoint to find a compromise between oxygen exposure and decompression time .
  • Page 70 Customization Setup / Faulty sensors / pO source [O Pressure sens. diff. Only two pressure sensors are available and they differ by 1 .5m or more . For example, when running on one CU and the fine pressure sensor is faulty . Customization Setup / Faulty sensors / Pressure sensors Disable or enable desired pressure sensor .

  • Page 71: Medium Priority

    Customization Fixed at 10% battery level . This alarm is not customizable, though please note that setting “Low battery” warning level below 10% suppresses the critical alarm . The diver will get only the “Low Battery” alarm . 2.12.3 Medium priority Slow down The ascent or descent speed exceeded the set value .

  • Page 72: Notifications

    Bailout remaining time for the dual CCR mode is active only when the “BOCCR settings” is enabled . This alarm is only in the Bailout CCR mode . The last word indicates what is the limiting factor . At the moment that can be Battery, Stack and CNS .
  • Page 73 Automatic switch to high setpoint, you may set a depth in descent, after a time or depth in ascent . Low setpoint Setpoint change notification, automatic or manual . Automatic switch to setpoint low is possible only when using descent setpoint feature . With the descent setpoint active, the Liberty will automatically switch to low setpoint once the loop reach the low setpoint, or after 10’...
  • Page 74 No deco end End of the no-decompression part of the dive . Customization Setup / Alarms / Notifications / No deco end [On] Depth 55 m reached Custom depth notification, diver can set three depth notifications for descent, and three for ascent .
  • Page 75 Notification for a gas change based on current depth, available mixtures and set maximum Customization Setup / Alarms / Notifications / Gas sw . remainder [Off] EAN50 Open circuit only . Switched to an OC mixture, automatic notification immediately after gas switch in menu as a confirmation of a successful gas switch .

  • Page 76: Procedures

    For planning a dive in the strict sense (gas management and decompression) the internal functions of the CCR Liberty can be used . The planner calculates a dive plan in CCR mode or with an emergency bailout on open circuit . To compute the decompression, the Bühlmann ZHL-16B algorithm (with adjustable gradient factors) as well as, an on-line decompression calculation is used .

  • Page 77: Planning

    a diver’s ventilation can exceed 50 l / min (1 .8 cuft / min) . For details on the planner settings, see Menu / Setup / Decompression / Planner setup Rounding Here you can set the decompression rounding time to 60 seconds, 30 seconds or 1 second Last stop This specifies the depth of the last planned stop at 3 m (10 ft) or 6 m (20 ft)
  • Page 78 Liberty allows the plan to be calculated on each handset separately, so the user can simultaneously plan for the entire dive on the rebreather and an emergency plan with a bailout ascent on the second handset . Just set the surface interval, target depth, and bottom time .

  • Page 79: Dive Preparation

    it is red . In this case, it is necessary to add another gas to the dive plan . If you do not have additional gas available, shorten the bottom time or reduce the target depth . Avoid reducing the RMV value, as the dive plan should always be done with possible crisis situations where increased gas consumption is anticipated .
  • Page 80 The maximum safe operating period of the sorbent is 168 min, determined by a test in accordance to EN 14143:2013 (Article 6 .6 .2) . During the test, 1 .6 l/min of CO were added to the breathing loop with a ventilation rate of 40 l/min and an exhalation temperature of 32±4 °C; the unit was submerged in 4 °C water to a depth of 40 m with a ppCO of 5mBar (test provided by Life Support Test Facility –...
  • Page 81 the breathing circuit and cause infection . A seemingly clean surface can be contaminated with microbes, especially in tropical and subtropical conditions . If you cannot ensure the cleanliness of a surface, place the cartridge on a clean towel . Follow these hygienic principles when filling and handling the scrubber in any way .
  • Page 82 If the cartridge is overfilled, there will be a gap greater than 17 mm between the edge of the lid and the edge of the metal mesh, and it will not be possible to insert the retaining ring without excessive force . In such a case, remove the excess sorbent with a clean teaspoon or any other suitable tool .

  • Page 83: Assembling The Rebreather Body

    3.2.2 Assembling the rebreather body Mount the head on the CO scrubber canister . When mounting the head, push the scrubber canister pin into the opening on the head, and close the head . Press on the head from above so that it is fully seated .

  • Page 84: Attaching The Counterlungs And Hoses

    4 . Press down on the lever in the middle of the apparatus and check whether the lock is closed . 5 . Check whether the apparatus is firmly attached . 6 . Secure the body with the securing strap . 3.2.4 Attaching the counterlungs and hoses The position of the counterlungs in relation to the diver’s body determines the work of breathing .

  • Page 85: Tank Filling

    When handling oxygen, follow the procedures and rules with which you were familiarized in a trimix course and, subsequently, in a CCR Liberty course . If you have not successfully completed such a course, do not handle the CCR Liberty .
  • Page 86 70 bar, not even a brief dive should not started . According to the standards to which the CCR Liberty is CE certified and designated, do not dive to depths greater than 100 m . Therefore, the CCR Liberty is CE certified to 100 m . Oxygen Use oxygen intended for breathing .

  • Page 87: Battery Charging

    . In you prepare the CCR Liberty for diving no more than one week after charging, insert the jumpers so that their pins are inserted into the connector . The rebreather will thus be switched to standby mode, and it will be possible to switch on the control unit using the handset .

  • Page 88: Calibration Of The Oxygen Sensors

    Before calibration, make sure only air and no other gas is present in the inlet chamber of the helium sensor (inside the head) and that the helium sensors are not contaminated with moisture . Select Menu / Setup / Calibration / Calibrate He – Air The measured speed of sound should approximately be around 0 .5500 ms .

  • Page 89: Preparing The Bailout Apparatus

    At higher altitudes above sea level, the partial pressure of oxygen in the calibration mixture decreases in proportion to lower atmospheric pressure . The CCR Liberty measures atmospheric pressure and takes it into account during calibration . Therefore, do not perform any corrections at higher altitudes above sea level .

  • Page 90: Physical Inspection

    Check to ensure that the CCR Liberty is complete, correctly assembled, and mechanically undamaged . If the CCR Liberty is operated within an organization where someone other than the diver is responsible for the physical preparation of the apparatus, we recommend providing them a list of detailed organizational rules .

  • Page 91: Internal Testing Of The Control Units

    (in accordance with the Responsibility of the CCR Liberty User set forth in the introduction) . Ignoring the conclusions of the pre-dive inspection is the diver’s choice, for which he/she bears responsibility .

  • Page 92: Comparison Of Oxygen Sensors And Their Calibration

    The purpose of the pressure sensor test is to determine whether the pressure sensor values correspond to the actual pressure (altitude) and do not show any significant deviations from the expected pressure or from each other . 3.3.3 Comparison of oxygen sensors and their calibration The current values of the individual sensors are shown on the display in millivolts (ppO values...

  • Page 93: Battery Testing

    3.3.5 Battery testing Both batteries are stressed with an artificial load caused by an intentionally increased power consumption by the processors, connected solenoids (without using energy-efficient control), vibration motors, and the maximum brightness of the HS display . After completing the test, the status of both batteries (%) (including the estimated duration of the batteries in dive mode) are shown .

  • Page 94: Bd Inspection

    3.3.8 BD inspection The buddy display successively lights up green at low, medium, and high intensities, then in red at low, medium and high intensities . A symbol with the same color is at the same time displayed on the HS; intensity is indicated by the size of the symbol .

  • Page 95: Positive Pressure Test

    Note: In spite of a positive result of a negative pressure test, leaks may occur during the dive . This is most often caused by a loose or punctured rubber mouthpiece . 3.3.10 Positive pressure test The purpose of this test is to detect possible leaks in the breathing loop, which appears when the pressure in the loop is higher than the ambient pressure .

  • Page 96: Prebreathe

    the case of an old calibration or a sensor deviates of more than 10%, a warning will be issued along with recommendations for re-calibration . Follow the checklist . The diver is required to personally verify all the items listed . 3.3.12 Prebreathe Pre-breathing the unit has a major impact on the safety of the dive .
  • Page 97 observing oxygen sensors during breathing from the unit, testing the absorber functionality should only be performed under the conditions listed below, while also listening to your body’s reactions . Even after a 5-minute pre-breathing from the unit, it is not guaranteed that a poorly filled or missing absorber has been detected .

  • Page 98: Diving

    3.4 Diving 3.4.1 Breathing high oxygen content gases The mixture in the CCR Liberty circuit usually contains oxygen at a much higher partial pressure compare to the air we breathe on the surface . Acute (CNS) oxygen poisoning Exposure to high oxygen partial pressure may, under certain circumstances, cause acute (CNS) oxygen poisoning .

  • Page 99: Putting On The Apparatus

    3 . Put on the shoulder straps, ideally with both arms at the same time . 4 . Stand up on both feet . Due to the weight of the CCR Liberty, avoid rotating your spine, which could lead to injury . Before you stand up, carefully assume a kneeling position, and then stand up .

  • Page 100: Using The Dsv

    3.4.3 Using the DSV The DSV must be closed at all times when it is not in your mouth . Close it before taking it out of your mouth; open it after putting it in your mouth, and clear the DSV before inhaling . Opening the DSV when it is not in your mouth will cause an immediate loss of buoyancy and could possibly flood the breathing loop .

  • Page 101: Switching To Ccr Mode

    Another option is a diluent flush (correctly taught in the CCR Liberty Diver course) after which you compare the result with the value in the lower left corner on the sensor voltage screen . This gives the ppO diluent at the current depth . The sensor, which after a diluent flush corresponds to the displayed value, can be considered valid .

  • Page 102: Submersion

    . The possible use of the open-circuit bailout apparatus has a more significant impact on weight reduction . Determining of the correct amount of ballast is one of the skills that you will learn in the CCR Liberty course . 3.4.8 In-water check Verify the ppO control system and adjust buoyancy .

  • Page 103: Controlling Buoyancy And Trim

    . The optimum trim of the diver is horizontal, even when descending and ascending . During the course on diving with the CCR Liberty, you will find the optimum ballast position . Do not use a weight belt .

  • Page 104: Mask Clearing

    . Therefore, keep mask clearing to a minimum . 3.4.12 Increased physical exertion The CCR Liberty adds oxygen to the breathing loop as needed . Unlike with some mechanical rebreathers, increased physical exertion does not lead to a reduction of the partial pressure of oxygen .

  • Page 105: Post-Dive Procedures

    . This is important to ensure a long lifetime and functionality of your sensors . In areas or periods with increased humidity, we strongly recommend using the DIVESOFT Head drying fan .

  • Page 106: Cleaning And Disinfection

    No more than a week may pass from the first dive after disinfection until the next disinfection if the CCR Liberty is stored in a cool place . When storing the rebreather at a temperature higher than 25 °C, this interval decreases to four days; the weekly interval can be maintained only for the scrubber cartridge .

  • Page 107: Battery Care

    Instead of Divesoft disinfection, one can use a different antiseptic agent based with quaternary ammonium salts that is compatible with the materials from which the CCR Liberty is made . The CCR Liberty’s manufacturer does not guarantee the compatibility of antiseptic agents other than Divesoft disinfectant .

  • Page 108: Dive Log Download

    Cleaning and disinfection . If the CCR Liberty is stored in a dry and clean environment, do not connect the corrugated- hose assembly with the DSV to the head or to the breathing bags, and store the rebreather open . Dust occurs almost everywhere and is inevitable . Limit the accumulation of dust by, for example, covering the unit with a washed bed sheet .

  • Page 109: Emergency Procedures

    A common type of backup device is a standard stage bottle . If, during a dive, a malfunction occurs in the CCR Liberty that you are not able to resolve or precisely identify, or if you have a suspicion that something is wrong with the rebreather, switch to the bailout apparatus: 1 .

  • Page 110: Oxygen-Source Malfunction

    Knowledge and skills related to stage bottle use is a necessary requirement for anyone interested in diving on the CCR Liberty . In a CCR Liberty diving course accredited by the manufacturer, the use of stage bottles for backup purposes is thoroughly practiced .

  • Page 111: Diluent-Source Malfunction

    Manual bypass valve does not function, oxygen is not added after pressing This malfunction does not pose an immediate threat to the diver . However, do not continue in your descent or penetration . Start your ascent or return . Oxygen delivery does not function by means of either the solenoids or manual bypass valve In this case, it is necessary to terminate the dive .

  • Page 112: Scrubber Malfunction

    Manual bypass valve does not function, diluent is not added after pressing This malfunction does not pose an immediate threat to the user . The dive can continue with automatic delivery of diluent into the circuit using the ADV . Manual delivery of diluent can be accomplished by pressing the ADV .

  • Page 113: Inadvertent Release Of The Mouthpiece

    If you experience discomfort when breathing but the symptoms are not severe enough to pose a risk of unconsciousness, test the concentration of carbon dioxide in your blood . Stay where you are without moving; do not in any case change depth significantly . Try to hold your breath for ten seconds .

  • Page 114: Loss Of Buoyancy

    If the compensator’s lift capacity does not suffice or if it fails to fill (whether that be with the power inflator or orally), use your dry suit to attain buoyancy . The CCR Liberty user must have sufficient knowledge and skill to safely use a dry suit as a backup source of buoyancy .

  • Page 115: Malfunction Of Oxygen-Concentration Measuring

    . Complete removal of the CCR Liberty and any other equipment attached to the harness can be time consuming . Sufficient buoyancy provided by the CCR Liberty can aid in the rescue process . 3.6.9 Malfunction of oxygen-concentration measuring...

  • Page 116: Detection Of Leaks

    After eliminating the problem, negative and positive pressure tests must be repeated . 3.7.3 Regular service inspection The CCR Liberty requires yearly service inspections (maximum 12 months) or after 150 hours of usage, whichever occurs first . Service inspections must be performed by a service technician certified by Liberty Systems or performed by the manufacturer .

  • Page 117: Firmware Update

    Straps are generally replaced for aesthetic reasons . You can order a replacement when ordering a regular service inspection . 3.7.5 Firmware update The CCR Liberty’s electronics have two different types of firmware (FW): one for the control unit, the other for the handset . It is possible to download the current version from the support page at www .CCRLiberty .
  • Page 118 Liberty head, both handsets, 3mm allen key, multi-purpose USB connector, and a USB AB cable (same as the cable used for printers) . Open the Firmware manager on your personal computer, select CCR Liberty, and press Next . If you have your Liberty already connected, the system proceeds automatically to the next step .

  • Page 119: Transport

    3.8 Transport 3.8.1 By car Transport the CCR Liberty in the case in which it was delivered . Make sure the case is secure and will not move around in the vehicle’s cargo space . The dustiness of the sorbent increases when transported in its loose state in the distribution canister .

  • Page 120: By Plane

    . If you need to prepare the CCR Liberty for diving while onboard a boat, secure it to a bench using the holes in the upper part of the backplate . This will give you full access to the tanks for filling, and you can easily remove the head and scrubber canister .

  • Page 122: Liberty User Manual

    Liberty User Manual Author Adam Procháska, Jakub Šimánek, Aleš Procháska . Publisher Divesoft s .r .o . www .divesoft .com Issue Revision 2 .11 October 2020 Use of this manual approved by Lucie Šmejkalová, CEO EC Type-examination for Directive 89/686/EEC by Notified body No .
  • Page 123 Date of issue: 30th June 2020; rev . 2 .11 CU HW rev . 1 .5, HS HW rev . 3 .0, FW 2 .11 Authors: Adam Procháska, Jakub Šimánek, Aleš Procháska Published by Divesoft s .r .o ., Divesoft .com...

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