Section: 2. Control-unit operation

2.1 Control elements

2.1.1 Surface mode inputs
2.1.2 Dive mode inputs
2.1.3 Language

2.2 Switching on the unit

2.2.1 Activation

2.3 Surface mode

2.3.1 Entering surface mode
2.3.2 Surface mode primary screen
2.3.3 Surface mode O₂ sensors screen
2.3.4 Switching to other modes
2.3.5 ppO₂ control in surface mode

2.4 Setup

2.4.1 Editor use
2.4.2 Setpoints
2.4.3 Mixtures
2.4.4 Decompression
2.4.5 Alarms
2.4.6 Preferences
2.4.7 Calibration
2.4.8 Faulty sensors

2.5 Dive mode

2.5.1 Detailed screen
2.5.2 Synoptic screen
2.5.3 Big Screen
2.5.4 Dive profile screen
2.5.5 Sensors screen
2.5.6 TTS Screen

2.6 CCR mode

2.6.1 Entering CCR mode
2.6.2 Switching to other modes
2.6.3 ppO₂ regulation
2.6.4 Decompression
2.6.5 Specific handset control

2.7 Manual CCR mode

2.7.1 Entering manual CCR mode
2.7.2 Switching to other modes
2.7.3 ppO₂ regulation
2.7.4 Decompression

2.8 Bailout OC mode

2.8.1 Entering bailout OC mode
2.8.2 Switching to other modes
2.8.3 Mixture
2.8.4 Decompression
2.8.5 Specific handset control

2.9 Ascent plan

2.10 Setup in Dive mode

2.11 Games

2.11.1 Sokoban
2.11.2 Snake

2.12 List of pop-up alarms and notifications on CCR Liberty

2.12.1 Critical priority
2.12.2 High priority
2.12.3 Medium priority
2.12.4 Notifications

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
• — Long press lower key
• — Long press both keys
• — Coded key press (press both keys, then release one key and press it again, then release both keys)
• — Tilt the HS away from yourself
• — Tilt the HS toward yourself
• — Tilt the HS to the left
• — Tilt the HS to the right
• — Tap the display glass
• — Shine a light on the display

“Long press” means pressing the key for more than 2.5 seconds. The key-press operation can be terminated by releasing the key one is currently on or when the last key is released (when pressing both keys).

The configuration of a given HS – whether set up for the left or right hand – will determine the tilting directions and which keys will constitute upper/lower.

The HS tilting configuration can be changed by tapping on the HS from any of the four sides.

2.1.1 Surface mode inputs

The keys and other inputs have assigned meanings in connection with the current item navigated to in the menu. At the same time, however, general rules, which apply wherever possible, are determined for their use.

• 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. Valid in Log book only. This has additional functions in the standard menu, indicated by a double check mark icon:

– enable or disable mixture without entering mixture edit (Setup/Mixtures/OC; Setup/Mixtures/CCR)

– Switching On/Off daylight saving (Setup/Preferences/Time&GPS/Timezone).

• Long press lower key — page down
• Long press both keys — return to main screen
• Coded key press — switch to maintenance mode (this can be done only from the main screen)
• Tilt HS away from yourself — increase the entered digit by one or check box
• Tilt HS toward yourself — decrease the entered digit by one or uncheck box
• Tilt HS to the left — move the cursor to the left
• Tilt HS to the right — move the cursor to the right

In certain instances, such as in the menu or editing screen, helpful symbols relating to the keys are displayed. A symbol can be either next to a single key indicating the action executed if the corresponding key is pressed, or between the keys (indicating the action executed if both keys are pressed).

The |↓| symbol indicates the user can scroll through the menu. Scrolling in the menu is cyclical, so the cursor will return to the top of the menu list. A scroll-up function is not available due to the two-key control.

The |↖| symbol means going back one level without executing any action.

The |√| symbol represents selecting an item or confirming an action.

2.1.2 Dive mode inputs

The input meanings in surface mode also apply to dive mode. Some exceptions are:

Long press upper key — shifts the setpoint to the next higher setpoint

Long press lower key — shifts the setpoint to the next lower setpoint

When playing decompression games, the tilting repsonse is more sensitive. Digit entry via tilting is limited to special cases only while in dive mode.

Tapping on the display glass will switch on the display if it was switched off. It is now also possible to set numeric values using the button editor. Setup/Preferences/Controls/Editor nav.

In the dark, shining a dive light on the display activates it in the same way as tapping on the glass. In a naturally lit environment, the display can be activated by covering and then uncovering it.

2.1.3 Language

All textual information on the CCR Liberty is in English. Controlling the apparatus requires knowledge of the English language at a level that at least allows the user to thoroughly understand this information.

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).

If the jumpers are removed (or turned so that the pins are not inserted in the connector), the rebreather’s control unit cannot be turned on, except with USB power when connected to a computer via an adapter.

2.2.1 Activation

The CCR Liberty is activated by pressing both keys on either handset for three seconds.

Automatic activation occurs in the event the units is submerged to a depth greater than 1.5 m. In such a case, the user cannot continue the dive, and must perform complete pre-dive preparation on the surface as soon as possible.

It is also possible to switch on the CCR Liberty via automatic activation in the event of damaging or losing both handsets. Using this option is risky and should thus be considered only for a rescue attempt, for example, evacuating a diver from a siphoning cave.

Upon activation, the rebreather switches to surface mode. If submerged to a depth greater than 1.5 m, the rebreather automatically switches to CCR mode (assuming the jumpers are connected to the batteries). Due to a low depth sampling rate when the unit is switched off, the rebreather will automatically switch on after approximately one minute of being submerged at a depth greater than 1.5 meters.

WARNING: NEVER BREATHE FROM A UNIT THAT IS SWITCHED OFF! This can result in serious injury or death.

2.3 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.

2.3.2 Surface mode primary screen

If you spend a long time in dive mode while not breathing from the rebreather’s loop, then increase the time for the stack time warning.

Don’t forget to reset the timer when you refill the scrubber (Predive → Stack time reset).

Max altitude

The maximum allowed altitude calculation is based on the ZHL decompression algorithm with an additional safety margin (GF = 0.80). It is a continuation of the decompression calculations and functions in the same manner as a decompression ceiling.

No fly

The calculation of the no-fly time is based on the maximum allowed altitude according to the Bühlmann decompression algorithm ZHL.

The air pressure in the cabin of a commercial aircraft is maintained at a level corresponding to air pressure at 1800–2400 m (6000–8000 feet) above sea level while cruising altitude falls in the range 11 000–12 200 m (36 000–40 000 feet).

The no-fly time calculation uses the decisive altitude of 4464 m (14 646 ft). At this altitude compartments containing the oxygen masks will be opened automatically and the oxygen masks will drop down in front of the aircraft passengers.

Battery symbol

A graphical indication shows the remaining battery capacity. The two batteries are indicated separately.

Setpoints

Descent (“-.--“ if disabled), low and high setpoints are listed.

ppO₂

The measured partial pressure of oxygen is displayed.

2.3.3 Surface mode O₂ sensors screen

You can also find the local time, the max. difference between the sensor readings, and the stack time on the O₂ sensors screen.

If after replacing the oxygen sensor you see its voltage is negative (-10mV), then it means that the connector to the sensor is wired backwards.

2.3.4 Switching to other modes

2.3.5 ppO₂ control in surface mode

Simple ppO₂ control is started in surface mode. If the oxygen content in the loop falls below 19% (with respect to the current atmospheric pressure) the solenoid will open to add 0.5 liter of oxygen. This should ensure that the partial pressure of oxygen will climb to a value of at least 0.23bar. Oxygen is then injected in six-second intervals (three seconds after the last closing of a solenoid). This control algorithm is intended to prevent a dangerous ppO₂ decline and the subsequent loss of consciousness of the user, who may have mistakenly breathed from the circuit without activating dive mode.

ppO₂ control is subject to other conditions; the oxygen cylinder must be full, connected, and open. PpO₂ 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.

ppO₂ control in surface mode only maintains the oxygen level closely above the hypoxia threshold; therefore, it may not be used routinely for breathing. Oxygen addition is not active when the head is connected to the charger.

2.4 Setup

The CCR Liberty is configured in surface mode. Activate the surface mode main menu with a short press of both keys and select Setup.

Some values can be set during a dive; however, this is reserved for resolving exceptional situations only.

The values set will depend primarily on the user’s experience, physiology, and personal preferences. The fact that the CCR Liberty enables the user to choose his/her own values does not mean such a setting is safe or suitable for the individual and their planned dive.

If you are not sure which value to set, leave the values on the default setting.

The manufacturer does not provide a warranty for incorrectly operating the CCR Liberty if the faulty operation is the result of an improper setup.

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.

Aletrnative editing method by tilting

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 — move the cursor to the right
• – Press upper key — discard editing (reset to previous value)
• – Long press upper key — reset to default value
• – Press both keys — exit without save
• – Press lower key — save and exit

Permissible range is indicated by minimum .. [default] .. maximum value.

The display shows a brief description below.

2.4.2 Setpoints

Use descent SP [Off]

This enables the use of the descent setpoint.

• – Use descent setpoint [On] enables Descent setpopint when starting a dive
• – Use descent setpoint [On+Sfc] the same as above + when surface to 0.3m or less activates again Descent SP for repeat dives, siphon dives and others.

See also chapter 2.6.3 Descent setpoint.

Use deco SP [On/Off]

Turns on or off the decompression setpoint used especially during the ascent.

ppO₂ descent [0.4 bar]

Value of the descent setpoint (range: 0.2—1.0 bar).

See also chapter 2.6.3 Descent setpoint.

ppO₂ low [0.7 bar]

Value of the low setpoint (range: 0.4—1.3 bars).

See also chapter 2.6.3 Setpoint.

ppO₂ high [1.3 bar]

Value of the high setpoint (range: 0.7—1.6 bars).

See also chapter 2.6.3 Setpoint.

FO₂ 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. Setting a percentage that is too high in shallow depths increases the intake of oxygen, which makes it necessary to discharge the contents of the breathing loop and makes balancing more difficult.

See also section 2.6.3 Setpoint limitation.

The values are entered into the chart of the dive profile schematic. Navigate the chart with the bottom button, select the item with the top button, tilt to edit.

For re-dive activation, the diver must first ascend to 0.3m or shallower, and on subsequent dives (without exiting dive mode) AutoSP-High or AutoSP-Descent is reset at 1.5m.

SPdeco auto

Setting of automatic decompression setpoint switch.

OC

Eight different OC bailout mixtures with various fractions of oxygen, nitrogen, and helium can be preset.

Each mixture can be enabled (marked checkbox) or disabled (clear checkbox). Only enabled mixtures can be selected.

Next to every gas mix a pressure (bar or PSI) and cylinder volume (litres or cubic feet) is displayed. During mixture editing, we set individual items separately. MOD (maximal operational depth) is displayed in a grey font, taking a maximum ppO₂ of 1.6 bar and END (equivalent narcotic depth) into consideration. END is usually expressed as the depth at which diving with air would have the same narcotic effects as the inert gases used in the current mixture. This theoretical depth is the equivalent of a specific target depth. In this case, however, the target depth is not known, therefore, the END is expressed as the % narcotic effect of the mixture on the air.

Mixtures that you have prepared for bailout (or staging) must be entered and enabled.

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. diluent

An alternative default diluent can only be selected from mixtures that are enabled.

2^ndDef. Dil

If a backup rebreather is used, it defines the composition of the diluent in the backup for relevant decompression calculations.

Def. OC mix

An alternative default OC bailout mixture can be selected only from mixtures that are enabled.

End pressure

End-of-cylinder pressure for planning gas management in the scheduler and BO RMT during the dive.

Min PO₂

Specifies the usability of OC mixtures with respect to the minimum ppO₂.

Max PO₂

Specifies the usability of OC mixtures with respect to maximum ppO₂.

RMV

Respiration minute volume is used to calculate gas management in scheduler and BO RMT during dive. We recommend setting a sufficient margin to deal with an emergency situation. RMV during a CO₂ hit can significantly exceed 50 l / min.

2.4.4 Decompression

GF low [0.30]

Gradient factor at the start of decompression (range: 0.05—1.00)

GF low determines an additional increase in safety at the decompression ceiling depth at the start of decompression. Setting a value of 1.00 corresponds 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—1.00)

GF high determines an additional increase in safety when ascending to the surface. Setting a value of 1.00 corresponds to the Bühlmann decompression algorithm without an additional increase in safety using the gradient factor method.

Setting low values leads to longer shallow decompression stops.

Bailout GF low [0.80]

Gradient factor for bailout at the start of decompression (range: 0.05—1.00)

As a general rule for bailout GF low, a higher GF value (a lower additional increase in safety) is set.

Bailout GF high [0.95]

Gradient factor for bailout at the end of decompression (range: 0.10—1.00)

As a general rule for bailout GF high, a higher GF value (a lower additional increase in safety) is set.

Deco model

You can choose between the decompression models ZH-L16B and ZH-L16C. Decompression model C is slightly more conservative than model B.

Rate & zone

This item allows you to set the descent and ascent speeds. The input is done in the schematic dive profile chart. Navigate the chart with the bottom button, select the item with the top button, tilt to edit. The "descent rate" is rate used exclusively in planner for descend. The following "warn under" depth is the first depth from which you may get the descend rate alarm, if you exceed the set "max rate". This setting is intended to limit the possible HPNS caused by fast descend in the deep part of the dive.

The ascent rates are divided into three zones: the maximum depth of the first limit; from the first limit to a second limit; and finally from the second limit to the surface. These limits can be defined in the graph on the right. The rates in the individual zones are part of the graph on the left output side.

Planner setup

The planner is used to help setup decompression and gas management plans. For a detailed description, see Planner settings – section 3.1.1

Reset deco data

This resets the saturation of inert gases and the calculation of oxygen toxicity to a state that corresponds to a very long period after the previous dive.

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.

2.4.5 Alarms

Ascent rate [On]

Ascent rate has exceeded the set limit; the system tolerates very short, fast movements.

Low battery [25%]

Battery power has dropped below the set limit (range: 0—40%). Setting 0 means deactivation of this alarm.

Min PO₂

Specifies the lower limit for ppO₂ alarm in CCR dive mode.

Max PO₂

Specifies the upper limit for ppO₂ alarm in CCR dive mode.

Air inegr.

Enables or disables low cylinder pressure alarms or loss of communication with the transmitter.

Notifications

Gas switch done [On]

Notifies that a change in mixture (in bailout OC mode) or diluent has been executed.

Notification that the dive time has been reached. It is possible to set three separate times within the range of 0 — 999 min. 0 means deactivation of the notification.

Notification that the set depth during the ascent has been reached. It is possible to set three separate depths within the range of 0 — 300 m. 0 means deactivation of the notification.

Stack time [150 min]

Notification that the cumulative time in any close circuit dive mode has been reached (range: 0 — 360min). 0 means deactivation of the notification.

To reset a timer go to the Predive menu.

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

BO RMT expiration

Enables or disables notification for end of bottom time with respect to bailout gas supply for emergency surfacing.

2.4.6 Preferences

Detailed — the primary screen displays all necessary information

Synoptic — the depth value is easy to read; it is accompanied by other important information

Big — the most important information written in large characters

Graph — Dive profile screen

O₂ sensors — detailed state of the sensors

TTS – Time to surface screen with unique BO RMT value and future TTS

Cylinder press. [Num.] / [Graph] / [All]

Determines how cylinder pressures are displayed on the detail screen. Numerically instead of time and CNS, or graphically instead of solenoid opening symbols.

Indication

Auxiliary displays

This refers to setting the position of HUD and buddy display. The default position for the HUD is on the right side and on the left side for the BD.

Color blind mode

If you cannot distinguish blue and green LED lights on the HUD, switch the color blind mode on. See section 1.10.3 Color Blind mode.

Timeouts

Key delay [0]

Minimum key press duration (range: 1 — 5, in 100 ms).

Auto switch off [45]

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.

Time & GPS

Set time

Sets the time manualy only when GPS synchronisation is not used

Timezone + DST [ ' ]

Time zone setting – necessary for correct synchronization with GPS long hold summer/winter time

Date format [ISO / EU / US]

ISO "YYYY-MM-DD"

EU "DD.MM.YYYY"

US "MM/DD/YYYY"

GPS Sync Time [On / Off]

Automatic time synchronisation according to GPS

GPS Log2SD [Off/DiveDay/Always]

Logging of the traveled route to SD card (downloadable via USB cable) logs every 20s position + HDOP (accuracy) *.GPX – xml format for google maps.

DiveDay - logs approx. 30 minutes before dive and 30 minutes after surfacing, marks dive and surfacing location.

Always – always logs if it has a signal ... not recommended because it will generate enough files on the SD card.

GPS format [DDDDD...]

Formát nastavení a zobrazení souřadnic

"DD.DDDDD"

"DDMM.MMM"

"DDMMSS.S"

Units & Misc

Units [Metric]

Metric and imperial units can be set for the entire apparatus. All physical calculations are internally executed using the metric system; results are converted for display only.

Salinity

This feature assesses the appropriate water salinity (Fresh/Sea). It has a direct influence to depth measurement.

Checklist [enabled]

When entering CCR mode from the surface mode menu, a checklist is displayed. This can be disabled.

BoCCR setting[Off/On]

In other menus it enables setting of relevant items for CCR bailout (Mixtures, Default mode, Bailout stby (CCR) mode).

Default mode [Main /Bailout]

Default mode of the unit when switched on by diving / jumping into the water.

Help [On/Off]

Help for each menu item, displayed after 10s on one line.

Editor navig. [Tilt]

The numbers in the editor can be increased or decreased by tilt or by tap. The tapping option may require some practice. Do not change the tilt setting unless you have a strong reason for preferring the tapping.

He measuring [TMX only]

TMX only – He sensors are used only in the case that the selected diluent contains > 20% helium. Never – He sensors are permanently deactivate.

2.4.7 Calibration

Calibrate He-Air

The He sensors are calibrated with air. The sensor is stable for a long period of time; therefore, perform a calibration only after replacing the sensor or if there are doubts about its accuracy. Sensors must be free of any traces of helium.

O₂ purity [99.5%].

The oxygen concentration in the calibration gas can be set. If possible, use oxygen with a purity of at least 99.5% for calibration.

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 ppO₂ of 1 bar or higher.

See also section 3.2.8 Calibration of oxygen sensors and 3.2.5 Oxygen.

Calibrate pressure

Recomm. days [3 days]

Recalibration of the oxygen sensors will be recommended after a set number of days (range: 0—30).

Horizontal calibration

The accelerometers are used for control by tilting and tapping. They have to be calibrated. Place the handset on a level surface (e.g. a table) before starting a calibration.

2.4.8 Faulty sensors

Oxygen sensors

This is the oxygen sensor status overwiev. Based on the results, the user may have to exclude individual oxygen sensors for ppO₂ calculation.

Normal – no sensor malfunction detected; the sensor is used as a data source.

Uncalibrated – sensor has not been calibrated.

Excluded – sensor excluded automatically by the algorithm. The algorithm can return the sensor to Normal status if it determines that the reason for exclusion has no longer exists.

Disabled – sensor excluded manually.

Error – sensor not present, or bad contact.

Offline – sensor not available (digital communication at the module level is not functioning).

Helium sensors

It is possible to include and exclude helium sensors.

Normal – no sensor malfunction detected; the sensor is used as a data source.

Uncalibrated – sensor has not been calibrated.

Disabled – sensor excluded manually.

Error – sensor not present, or bad contact.

Offline – sensor not available (digital communication at the module level is not functioning).

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 – sensor excluded manually.

Error – sensor not present, or bad contact.

Offline – sensor not available (digital communication at the module level is not functioning).

See also section 1.9.5 Pressure and depth measurement.

Other devices

You can switch off a solenoid that is not functioning properly. If so, the other solenoid overtakes completely, and its frequency is corrected from 12 seconds to 6.

pO₂ source

Switching the data source for the control of oxygen partial-pressure in the loop

O₂ – Oxygen sensors are used for measuring and controlling the oxygen

He – He sensors are used to indirectly measure and control the oxygen

pO₂ source is only allowed if helium measurement is enabled

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2.5 Dive mode

of a stay on the surface (or at a very shallow depth) followed by a second submersion (during a time set in the dive termination timeout) the dive time indicated will be the time from the first submersion including the surface time.

Depth

The depth can be read in the units selected in the setup (m or ft). Depth is calculated from measured hydrostatic pressure. Fresh water (default) or seawater density can be set for the depth calculation (units and salinity are set in Setup → Preferences).

Setting fresh/sea water does not affect decompression calculations. Decompression is based on ambient pressure and is independent of the displayed depth.

No deco

You can stay for the indicated time at the current depth, breathing the current mixture (current He content and current SP), to avoid a decompression obligation. It is, however, presumed that the diver will follow the recommended ascent rate.

During the dive, there is a situation where the No Deco indicator already shows a zero value, but the decompression ceiling value is still not displayed. Such a situation can last for tens of seconds. The scenario is due to the fact that the No deco time has ended and the decompression ceiling is below the surface level, but its value is so low that there is no need for staged decompression as a free ascent is advised.

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. This approach may be more effective in terms of decompression time. Time reference is TTS (Time To Surface). Do not follow the decompression ceiling at low depths if conditions do not permit it. Waves, currents, positive lift of gear at a shallow depth, no visual reference, and other factors can cause uncontrolled ascent above the ceiling or completely hinder decompression at this level.

Ascending above the ceiling generates a warning. A further violation of more than 1 m (3 ft), leads to an additional alarm. Both alarms are logged. The decompression calculation will continue without a penalization. The diver is responsible to decide how to minimize the probability of severe consequences.

Decompression is no longer required when the ceiling value disappears. In that case, it is possible to surface.

TTS

The time to surface (TTS) includes the complete decompression profile. The rounding of TTS is influenced by the settings in Menu / Setup / Decompression / Planner setup / Rounding. The rounding can be set to 60 s, 30 s, 1 s.

Battery symbols

Combined graphic symbol

A combined graphic symbol on the detailed screen is intended for rapid awareness. It tells the diver what must be done. The color of the warning symbols changes from yellow to red according to the degree of severity.

t (Temperature)

Water temperature is measured inside the HS housing. After a water temperature change wait about 1-2 minutes until the temperature reading is stable. The air temperature is affected by many factors and is only an approximate reading. If you see a yellow exclamation mark next to the temperature value, it means that the other handset is not communicating and the temperature is calculated based on only one sensor. In case you are using only one handset, you can switch the unit to the sidemount settings: Setup / Preferences / Controls & Build / Mount -> Side.

CNS

The so called “oxygen clock” is a percentage of consumption of CNS toxicity limit. Calculation is based on NOAA oxygen exposure limits.

See also section 3.4.1 Breathing high oxygen content gases.

Diluent

The currently used diluent is displayed.

Solenoid symbols

In the lower left and right corners, there are symbols indicating the state of the solenoids according to data from the control units.

X – solenoid is closed

= – solenoid is opened

SP

The setpoint is a required ppO₂ value. The setpoint values are usually displayed in white. The setpoint value will be displayed in yellow when the value is not physically reachable (ex. Setpoint of 1.4 in 2 meters). The evaluation of the ability to reach the setpoint is influenced by the maximum FO₂. 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 FO₂ 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 ppO₂ does not drop below 1.04bar [1.3×0.8]. The setpoint value will be displayed in red only when the setpoint is changed.

For information on adjusting the setpoint, see section 2.6.3 Setpoints.

O₂ sensors

The ppO₂ measured by individual O₂ sensors is displayed.

ppO₂

The ppO₂ can be measured directly (using O₂ sensors) or indirectly (using He fraction sensors). It shows the average value.

See section 1.9.2 Direct measurement of ppO₂ and 1.9.3 Measurement of He content.

Exclamation mark

If a yellow exclamation mark is displayed next to a value, it means that one or more sensors were excluded. This applies to the measurement of ppO₂, temperature, pressure and helium.

2.5.4 Dive profile screen

Dive time

Runtime of current dive is placed in lower right corner.

Max

This is the maximum depth reached during the dive. The field with this value is placed in the middle of the bottom line.

He0 / He1

Helium content in the loop as detected by the individual helium sensors. Under ideal conditions the measured value will correspond to the fraction of helium in the diluent.

pO₂

Partial pressure of oxygen in diluent at current depth.

pO₂ indirect

Indirectly measured ppO₂ using helium sensors. The cell is shaded blue. When using indirect measurment of ppO₂ via the helium sensors, the cell will also be shaded blue.

Stack

Scrubber stack time

2.5.6 TTS Screen

The algorithm counts all the set gases and their amount together with the specified minute consumption (RMV). In order for the calculation to be correct, it is always necessary to accurately enter the volume, pressure, and composition of the gas and to have only those gases actually used in the gas list. BO RMT is calculated based on the Bailout GF setting. If bailout rebreather is used as bailout source and Bo CCR mode is enabled in Setup -> Miscellaneous, then BO RMT is calculated based on:

• – battery life
• – scrubber depletion (Stack time)
• – AI i oxygen pressure and the specified bottle size, it calculates a metabolic consumption of 1.6 l/min

The value is displayed in Bo CCR mode on the "Sensors screen" instead of the helium sensors. When the BORMT expires BoCCR will trigger an alarm.

BO TTS

The time required to surface in the case of OC bail out ascent. The ascent time is calculated according to the Bailout GF setting

TTS (+2) (+5) (+10)

The values of these three items represent future TTS (i.e. the length of ascent if the diver stays at the current depth for the next 2, 5, or 10 minutes). In the saturation phase of the dive, the values increase gradually; in the desaturation phase; it is the opposite.

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. If submersion to a depth greater than 1.5 m occurs in surface mode or standby mode, the rebreather will automatically switch to CCR mode. Do not intentionally use this switching method; it is intended only for emergency situations.

2.6.3 ppO₂ regulation

The basic function of the CCR Liberty is to maintain correct partial pressure of oxygen.

A predictive algorithm of ppO₂ control is used. Measured ppO₂ is adjusted according to the mathematical model of the breathing loop. The calculation of O₂ delivery and possible subsequent opening of the solenoid is performed at six-second intervals. Oxygen is added alternately using the solenoids corresponding to both control units.

In the event that it is not possible to determine the actual depth (due to a malfunction or manual exclusion of all pressure sensors), regulation of oxygen delivery switches to a simple algorithm.

Setpoint

The setpoint is a required ppO₂ value; for information on adjusting the setpoint, see section 2.4.2 Setpoints. Two special values, “low setpoint” and “high setpoint” are fixed. These can be selected simply by a long press of the upper key (for the high setpoint) or lower key (for the low setpoint).

In the default setting, the low setpoint has the value of 0.7 bar (70 kPa). It is possible to reset it within the range of 0.4 to 1.3 bar.

In the standard setting, the high setpoint has the value of 1.3 bar (130 kPa). It is possible to reset it within the range of 0.7 to 1.6 bar.

Upon starting the CCR dive mode, the low setpoint is activated by default.

Descent setpoint

The descent setpoint is designed for situations when the diver needs to rapidly descend to a given depth, for example, when diving in a current. The utilized algorithm uses the natural rise of ppO₂ during descent. It is necessary to descend rapidly; the natural rise of ppO₂ has to be faster than the oxygen consumption.

Use of the descent setpoint must be enabled in the configuration.

If it is enabled, the descent setpoint is automatically activated when switching from surface mode to CCR mode. It cannot be activated in another way. The descent setpoint has a variable value. The initial set value gives the ppO₂ on the surface. At depth, the current setpoint increases linearly by 0.2 bar (20 kPa) for every 10 m of depth (i.e. it increases by the same absolute values as when diving with an open circuit with air, only with a different initial value).

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 ppO₂ limit and adjust the rate of descent accordingly, or take other measures.

Descent setpoint can be re-enabled by key shortcut or from the Setpoint menu (if we are at an applicable depth).

If On+Sfc is set in Setup / Setpoints / then the descent setpoint at the surface will never timeout.

WARNING: if the initial Descent SP value is lower than the set threshold for the Low ppO₂ alarm, then while the Descent SP is active it will only alarm if it reaches 0.05bar less than the current Descent SP value - this is especially true at depths shallower than 6m when the Descent SP is set to 0.2bar (at the surface) and the default Low ppO₂ alarm is 0.3bar.

Setpoint limitation

Besides the set value, the setpoint limit is defined by the ambient pressure. For example, at a depth of 3 m, where the hydrostatic pressure is 1.3 bars, ppO₂ can reach a maximum of 1.3 bar when using pure oxygen.

Since obtaining a presice 100% of oxygen in the loop is not always practical, the setpoint is set at 90% of the ambient pressure by default. This value can be reset within the range from 60% to 96%.

Emergency ppO₂ control

If all chemical sensors are not valid (error, disabled etc.), the depth is < 6m/20ft, and the ppO₂ source is form O₂ sensors, an emergency O₂ injection + alarm is done every 6s.

The unit assumes that in a depth lower than six meters the risk of hypoxia is greater than the risk of hyperoxia, and prevents the fatal consequences of dysfunctional or disabled sensors. In this case, the diver must not continue his/her descent until the ppO₂ stabilizes and the diver is sure of the breathing mixture.

Emergency ppO₂ control by indirect measuring with He sensors

If all chemical sensors fail in dive mode, an alarm “pO₂ measuring lost” is brought up.

Indirect measurement of ppO₂ using helium sensors can only be activated manually, provided that the helium measurement setting is switched on (TMX only) and the helium fraction in the diluent is greater than 20%. When using indirect oxygen measurement with helium sensors, always be sure that helium sensors are calibrated and functional.

For indirect oxygen measurements, all fields displayed with ppO₂ are blue.

2.6.4 Decompression

The decompression algorithm takes measured ppO₂ values and inert gases according to the set diluent composition into account.

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 — next higher setpoint

Long press lower key — next lower setpoint

If Descent SP and Deco SP are enabled in the settings, switching with key shortcuts also takes place between them.

2.7 Manual CCR mode

This mode serves primarily for training

2.7.2 Switching to other modes

In the menu, it is possible to switch from manual CCR mode to CCR mode and bailout OC mode. If the current depth is less than 1.5 m, it is possible to switch to surface mode and standby mode.

2.7.3 ppO₂ regulation

Manual CCR mode is based upon CCR mode. However, automatic replenishment of oxygen is not available, and ppO₂ regulation is performed only manually. The display of ppO₂, decompression calculations, and other data is operational.

It is assumed that the user adds oxygen manually using the manual bypass valve or by manipulating the oxygen-cylinder valve if any solenoid is locked in the open state.

If the ppO₂ 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. This delay is due to the fact that oxygen is added to the exhalation bag and the mixture must pass through the scrubber before it reaches the sensors.

2.7.4 Decompression

The decompression algorithm takes measured ppO₂ values and inert gases according to the set diluent composition into account.

2.8 Bailout OC mode

This mode serves primarily for resolving emergency situations.

2.8.2 Switching to other modes

In the menu, it is possible to switch from bailout OC mode to CCR mode and manual CCR mode. If the current depth is less than 1.5 m, it is possible to switch to surface mode and standby mode.

2.8.3 Mixture

Up to eight breathing mixtures are can be available in this mode. The user can select the currently utilized mixture from the menu or can successively select individual mixtures with a long press of the upper or lower key. After switching to bailout OC mode, the configured default mixture is set.

2.8.4 Decompression

The decompression algorithm takes the partial-pressure values according to depth and the set mixture into account.

After switching to bailout OC mode, the safety level is automatically set using the bailout gradient factors (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.

2.8.5 Specific handset control

Long press upper key — change of mixture (up according to the list, cyclically)

Long press lower key — change of mixture (down according to the list, cyclically)

2.9 Ascent plan

If a diver is in no-deco time, only “Free ascent” is shown.

Calculating and displaying the Ascent Plan is also affected by the Planner setup setting; in particular, the depth of the last decompression stop (whether the ascent is calculated with all available mixes), or with the current mix only. Details of settings are in section 3.1.1 Planner settings.

To decrease the current setpoint, move the cursor to -0.1 and press the top button repeatedly until you reach your setpoint. Once you have reached the desired value, move the cursor to Accept and confirm the change by pressing the upper button.

These setpoints are only temporary. By switching to low or high setpoint, a temporary setpoint is deleted, and the procedure described above has to be repeated to reset it.

Set high

Switch to high setpoint

Set low

Switch to low setpoint

Faulty sensors

In the event one or more sensors malfunction, it is necessary to exclude the faulty sensors from averaging. Disable the non-functional sensor or switch the oxygen measurement mode (oxygen or helium sensors). Faulty sensors would cause a poor evaluation of the unit’s condition, which could have fatal consequences. The procedure for excluding and including all sensors is the same as the procedure in the surface mode – see section 2.4.8 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.

Screens

This feature turns some screens on or off. The procedure is the same as the surface mode setting; see Chapter 2.4.6 Preferences.

Diluents

The diluent setup feature is used to switch or set a new diluent if another diluent is used from an off-board source. In order for the diluent to be used correctly with respect to the decompression and the He-N2 ratio, a diluent flush should be performed to replace the original gas.

Mixtures (OC mode only)

This feature can be used to edit current bailout mixtures or add a new bailout mixture. It is also possible to deselect a lost decompression bottle so it is not counted in the ascent calculation. The setting is the same as setting the blends in surface mode: chapter 2.4.3 Mixtures.

Brightness

Adjust the brightness of the display (1-10). The brightness of the display significantly affects the power consumption. To save the battery, reduce the brightness of the display to the lowest acceptable level.

HUD brightness

The HUD diode brightness can be set to 3 different levels. In very dark conditions, the full brightness of the diodes may be irritating, but in sunny shallow water the low brightness may be less visible. The intensity is adjusted by pressing the upper button.

2.11 Games

Do not disable error messages and notifications if the games are played underwater.

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

The player is confined to the board and may move horizontally or vertically onto empty squares (never through walls or boxes). The player can also bump into a cylinder, which pushes it into the square beyond. Cylinders may not be pushed into other cylinders or walls, and they cannot be pulled. The puzzle is solved when all cylinders are in the storage locations.

2.11.2 Snake

The snake can lose its length slowly (every 30 steps), and when it is too short, it dies from starvation.

The player attempts to eat fish by running into them with the head of the snake. Each fish eaten makes the snake longer, so maneuvering becomes progressively more difficult.

2.12 List of pop-up alarms and notifications on CCR Liberty

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.

The “Notifications” are informative messages with the lowest priority, e.g. deco stop end, etc.

In the “Customization” paragraph is the path through menu to the relevant item with [default] option in square brackets.

Please note that most menu items are available only in surface mode, but few are available only in dive.

2.12.1 Critical priority

Low pO₂

The loop ppO₂ have fallen below the “Min pO₂” threshold. When the ppO₂ falls even further, the alarm repeats every 0.1 bar.

For example, with default settings of ppO₂ 0.3 bar, first alarm sounds at ppO₂ just below 0.3 bar, then another at 0.2 bar, and at 0.1 bar.

Customization

Setup / Alarms / Alarm Sources / Min pO₂ [0.3]

Surface mode uses fixed threshold of 0.18 bar.

High pO₂

The loop (or OC mixture) ppO₂ exceeded the “Max pO₂” threshold. If the ppO₂ keep rising, the alarm repeats every 0.2 bar.

For example, with default value of 1.6 bar, first alarm sounds just above the 1.6 bar, then at 1.8 bar, 2.0 bar etc.

Customization

CCR

Setup / Alarms / Alarm Sources / Max pO₂ [1.6]

OC

Setup / Mixtures / Max pO₂ bottom [1.4]

Setup / Mixtures / Max pO₂ deco [1.6]

Please note that internally the "Setup / Mixtures / Max pO₂ deco" equals "Setup / Alarms / Alarm Sources / Max pO₂".

Changing one will change the other as well.

PO₂ measuring lost

All O₂ sensors are malfunctioning or disabled, the Liberty has no means of reading current ppO₂.

If you are using trimix as a diluent, and have helium sensors in working order, then you can manually switch to the backup computed ppO₂ reading using helium sensors. The “pO₂ backup mode” notification will follow, and all ppO₂ values will have a blue background to signify that they are not from the chemical oxygen sensors.

Customization

Switching to backup O₂ reading:

Setup / Faulty sensors / pO₂ source [O₂]

Above ceiling

Diver is less than 1m above the calculated decompression ceiling.

Very above ceiling

Diver is more than 1m above the calculated decompression ceiling.

2.12.2 High priority

Check O₂ 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 ppO₂ alarm (see section “Critical”).

This message is a clear signal for performing a sensors validation, usually by diluent flush. You are looking to confirm which sensors are faulty and which are working correctly (even the excluded ones). Once you decide that with confidence, then you can manually disable the sensors which are faulty.

There is possibility that the excluded sensor(s) is the only working one, and the rest is limiting, unable to reach the current ppO₂. This situation has happened before, and therefore is only a question of time when it will happen again.

When you are confident that the excluded sensor is indeed faulty, you can manually disable the sensor to suppress this alarm.

Please note that you can manually re-include the excluded sensor in the faulty sensors screen as well.

Customization

Manually disable and enable sensors:

Setup / Faulty sensors / Oxygen sensors

Oxygen #3 excluded

One of the oxygen sensors is deviating from the average calculated from the three other sensors by more than a 0.1 bar for at least 15 seconds. Unless disabled by diver, the sensor will be automatically enabled again, once it fits into the average for at least 10 seconds. The inclusion does not generate any alarm or notification.

Be aware that once you have one sensor excluded, the average ppO₂ is calculated from the three valid sensors. Also, any other exclusion compares one sensor to the other two, which is more prone to exclude a valid sensor if the other two become current limited.

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.

You may see this message after damaging fine pressure sensors (marked with “F” in system check) by diving to depths of over 150m.

Customization

Manually disable and enable sensors:

Setup / Faulty sensors / Pressure sensors

Other CU down

The Liberty head contains two control units “CU”, they are connected by one communication line. If one of the CUs stops responding for 10 seconds, the alarm is raised.

If the one CU goes offline, either by a low battery or malfunction of any kind, the other CU keeps full functionality, injecting oxygen using its own solenoid. CU is limited only by having two oxygen cells, two pressure sensors, one HS.

When using only one HS in sidemount, it is advised to connect HUD to one side and a handset to the other side of the head. So even running on one CU, you keep the ability to read loop ppO₂ on either HS or HUD.

CNS O₂ 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.

Customization

Setup / Alarms / Alarm Sources / CNS [On]

Stack time 240 min

The scrubber timer alarm. You can modify the notification time in surface menu according to your habits. Also, you can customize whether the timer should be active on the surface, or underwater only.

Customization

Setup / Alarms / Notifications / Stack time [150’]

Setup / Alarms / Notifications / Stack timer on sfc. [On]

On … timer running all the time when Liberty is in dive mode, even on the surface.

Off … timer running underwater only (below 1.5m).

SLOW DOWN !!!

Ascent speed exceeded 60m per minute.

Customization

Setup / Alarms / Alarm sources / Ascent rate [On]

pO₂ emergency mode

Notification after manual switch to calculating ppO₂ from helium sensors data. See also „pO₂ measuring lost“.

Customization

Setup / Faulty sensors / pO₂ source [O₂]

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.

Pressure #3 sensor bad

Pressure sensor value differs from the average of other pressure sensors by 1.5m or more.

Customization

Setup / Faulty sensors / Pressure sensors

Disable or enable desired pressure sensor.

High humidity CU L

It occurs when the humidity in the CU is higher than 75%.

Low battery

The battery level has reached warning level. Liberty has two batteries – one for each side, each battery then has its own alarm.

Customization

Setup / Alarms / Alarm sources / Low battery % [25]

Please note that setting the level below 10% suppresses the “Critical battery” alarm.

Furthermore, setting the alarm threshold too low, may result in warning too late to be useful.

Critical battery

The battery level has reached fixed level of 10%, the two batteries has separate alarms.

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.

Customization

Setup / Decompression / Rates & zones

Please note that ascent and descent rates are used also in the dive planner, TTS and ascent plan calculations.

BO RMT 4´

Bailout remaining time advance warning, warns about 5’ before expiration. For more information see “BO RMT expired” below.

BO RMT expired

Bailout remaining time expired. This marks a point of dive when the OC bailout will just last if you begin your ascent immediately. The calculations are based upon the decompression settings, enabled OC mixtures, cylinder volumes and pressures, respiratory minute value etc.

Warning

The BO RMT is only relevant, when you have all configuration set precisely for the current dive. Especially the OC mixtures setting, having enabled other OC mixtures than you take on the dive will render the BORMT calculation invalid.

BO RMT expired CNS

Liberty FW version 2.12 and up.

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.

Customization

Setup / Miscellaneous / BOCCR settings [Off]

Global Bailout CCR switch also decides whether the BO RMT calculation will be OC or CCR.

Lost Gas EAN 50

Open circuit mode only.

Notification that the best mix at this depth is marked “lost” resulting in ascent plan and TTS recalculation without the best mix. Switching to this gas will remove the “lost” tag and recalculate the ascent including the current best mix again.

This message can be caused for example by ignoring the “Switch to EAN50” at 21m notification (see below). The algorithm is 1^st notification, 2’ pause, 2^nd notification, 2’ pause and if even at this point diver did not switch to the advised gas, the gas is marked as “lost”.

Customization

Setup / Alarms / Notifications / Gas sw. reminder[Off]

The “Lost gas” feature is available only when “Gas sw. remainder” is turned on.

2.12.4 Notifications

High setpoint

Setpoint change notification, automatic or manual. The automatic switch to high setpoint is configurable in menu “SPh auto”.

Customization

Setup / Setpoints / SPh auto [Off]

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 ppO₂ reach the low setpoint, or after 10’ from submersion.

Customization

Setup / Setpoints / Use descent SP [Off]

Setup / Setpoints / ppO₂ descent [0.4]

Setpoint 1.1

Setpoint change manual, immediately after setting custom SP.

Customization

Setup / Setpoint / Accept

Custom setpoint is available in dive mode only.

Mode BO CCR

Manual or automatic mode change notification – OC, CCR, mCCR, BO CCR.

Automatic mode change is possible only from BO CCR to CCR, when the loop ppO₂ falls 20% below the diluent ppO₂ at current depth. For example, when the diver starts breathing from the unit in the BO CCR mode, without changing mode to CCR.

Please note that this is intended as an emergency feature only.

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.

Customization

Setup / Alarms / Notifications / Depth & Time

Time 33´ elapsed

Custom elapsed dive time notification, diver can set three different notifications.

Customization

Setup / Alarms / Notifications / Depth & Time

Bookmark 3

Notification that user bookmark has been saved to dive log.

Customization

Applications / Add bookmark

This item is available in dive mode only.

Switch to EAN50

Open circuit only.

Notification for a gas change based on current depth, available mixtures and set maximum ppO₂.

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.

Diluent TMX 10/50

Switched to a different diluent, automatic notification immediately after a diluent switch in menu as a confirmation of a successful diluent switch.

Factory defaults

All user settings have been reset to factory defaults.

Customization

Setup / Miscellaneous / Factory defaults