® Meridian
Meridian Diving Computer - Designed by Divers Welcome to SCUBAPRO dive computers and thank you for purchasing the Meridian. You are now the owner of an extraordinary partner for your dives. This manual provides you easy access to SCUBAPRO state of the art technology and Meridian’s key features and functions. Should you wish to know more about SCUBAPRO diving equipment, please visit our website www.scubapro.com. WARNING • Meridian has a depth rating of 120m/394ft.
English TABLE OF CONTENTS 1. Introduction to Meridian ....................................................................................... 6 1.1 Battery ..................................................................................................... 6 2. Meridian as a watch .............................................................................................. 8 2.1.1 Setting the alarm clock ........................................................... 12 2.1.2 Setting the UTC ...............
3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 4 Diving with Meridian ............................................................................... 3.6.1 Display information . ................................................................ 3.6.2 Display configuration during the dive ...................................... Altitude diving . ....................................................................................... 3.7.1 Altitude classes, altitude warning and no-fly time after a dive .. 3.7.
3 53 53 54 55 English 6. Taking care of Meridian . ..................................................................................... 6.1 Technical information . ............................................................................ 6.2 Maintenance .......................................................................................... 6.3 Replacing the battery in Meridian .......................................................... 6.4 Warranty ................................................
1. Introduction to Meridian 1. Introduction to Meridian The Meridian User Manual is divided into the following main sections. 1 Introduction to Meridian. This section provides an overview of the Meridian dive computer and describes its operating modes and functions when on the surface. 2 Meridian as a watch. This section describes Meridian when it is used as a watch. 3 Meridian as a dive computer.
1. Introduction to Meridian English is not recommended before changing the battery. Battery symbol WARNING Starting a dive when the battery symbol is flashing can cause the dive computer to fail during the dive! Replace the battery before any diving activity if the flashing battery symbol appears. When the ‘do not dive symbol’ appears with the battery symbol, Meridian can not be used for diving before replaced with a new battery. Do not dive symbol Please refer to chapter 2.1.
2. Meridian as a watch 2. Meridian as a watch Meridian is more than just a watch. It features: • a wake-up alarm-clock function • a stopwatch with lap time and 99 hours run time • an altimeter for tracking excursions to the mountains. • a thermometer The functions of the buttons when on the surface are summarized in the table below and explained in detail in the following sections.
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2. Meridian as a watch The reference point for any description of Meridian as a watch is the main time of day display. This is the display in which the current time is shown in the middle row. The upper display row shows the date. For example the diagram below shows Saturday, 23rd of November and the time is one second past 10 o’clock.
2. Meridian as a watch By pressing the SEL/ESC button from the main time and date display you will get into clock settings (marked dark at the graphics below). By pressing +/UP button you scroll to the next menu. By pressing SEL/ESC button you may edit the settings and values on that current menu.
2. Meridian as a watch 2.1.1 Setting the alarm clock 2.1.3 Alarm off By pressing the SEL/ESC button the alarm time will start flashing. You can scroll the hours setting by pressing +/UP or –/DOWN buttons. By again pressing the SEL/ESC button the minutes will start flashing and by pressing +/UP or –/DOWN buttons you can scroll them. By again pressing the SEL/ESC button the state of alarm will start flashing and ‘on’ or ‘off’ can be selected by pressing +/UP or –/ DOWN buttons.
2. Meridian as a watch Set the 12/24h mode is the month). By pressing the SEL/ESC button the setting will be saved and move to the next digits. Again by pressing the SEL/ESC button the year digits after the dot will start flashing. 2.1.6 English 2.1.4 Setting the sound to “off ” (silent mode) 24 hour display By pressing the SEL/ESC button at the mode menu 24h starts flashing. With +/ UP or –/DOWN buttons you may change between 24 hour or 12 hour format = am/ pm displays.
2. Meridian as a watch 2.1.7 Checking the battery status The battery status menu displays how much energy is left in the CR2032 battery. A brand new battery shows 5 dots. Meridian is periodically measures the battery status and you can manually trigger this display by pressing the SEL/ESC button in the battery status menu. The intelligent battery algorithm will limit some functions when the battery is close to running out. See the table below for battery status and function details.
2. Meridian as a watch F NOTE: voltage English The battery capacity and at the end of the battery lifetime may vary depending on battery manufacturers. Generally, operation at low temperatures decreases the battery capacity. Therefore, when the battery indicator drops below 3 dots, change the battery before making any dives. Change the battery before the next dive 2.1.8 Checking the device ID Each Meridian watch has a specific, individual ID number. The 10 digit ID number is shown in this menu.
2. Meridian as a watch 2.1 Menus and functions By simply pressing buttons +/UP or –/ DOWN from the time of day display you can scroll through the various menus in Meridian. The diagram below shows the sequence of the menus. Note that when you first reach a menu, you are “outside” of it. You must SEL/ESC button to enter the actual menu.
2. Meridian as a watch Using the Stopwatch The laps can be marked by pressing –/DOWN button when stopwatch is counting. By doing so the display will freeze for 5 seconds and Meridian shows the lap time. English 2.1.1 The first menu from the time of day display is STOP (watch). By pressing SEL/ESC button the stopwatch will be activated. Counting will continue automatically and the lap counter will show the number of laps at the bottom of the screen.
2. Meridian as a watch NOTE: barometric pressure is a F variable, changing with weather and atmospheric pressure at a specific elevation. Dive algorithm uses Altitude Classes which are directly derived from the barometric pressure. Altitude is counted from the current barometric pressure and it is therefore a relative value. The altitude can be adjusted when current elevation is known by pressing the SEL/ESC button. The altitude value will start flashing.
2. Meridian as a watch No-stop time when computing no-stop times or decompression schedules. English Depth By pressing SEL/ESC for planned depth the dive time appears at top row. Start point (minimum now) is the no decompression time. By pressing +/UP or –/DOWN buttons you may change the time in 1 minute increments. When no decompression time is exceeded the planner gives decompression time at the middle row.
2. Meridian as a watch 6 hours of diving and 22 dives have been done with this Meridian. By pressing +/UP or –/DOWN buttons you can scroll the dives in the memory. In SCUBA mode there is a main page showing maximum depth, dive time, dive date, log number and used Gas 1 oxygen mix. Max depth Dive time Dive number O2 mix Dive date If the dive has been done in GAUGE or APNEA modes, the main page has GA or AP instead of O2% at the bottom row.
3. Meridian as a dive computer Meridian as a dive computer English 3. Meridian is a full-featured dive computer, capable of multi-gas decompression calculations, ascent rate calculations and warnings. The logbook can store 50 hours of dive profiles with a 4 second sampling rate. While diving, it displays depth, dive time, decompression status, water temperature and much more.
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3. Meridian as a dive computer 3.1.1 gas, set scuba, set apnea and algorithm select. 3.1.2 English The dive computer functions of Meridian on the surface include, among others, setting the oxygen concentration for nitrox diving, setting the MB level of the decompression algorithm, setting various warnings and personal preferences,. To reach any of these functions, Meridian must be in Dive surface mode display.
3. Meridian as a dive computer is fixed to 1.60 bar when F NOTE: ppO selected oxygen fraction is 80% or 2 higher. Maximum partial pressure of oxygen (ppO2 max) By pressing SEL/ESC at this display the oxygen fraction starts to flash. By pressing the +/UP or –/DOWN button you may scroll the value. After accepting it by pressing the SEL/ESC button the maximum partial pressure of oxygen (ppO2 max) value starts to flash. By pressing +/UP or -/DOWN button the value may be selected from 1.00 bar up to 1.
3. Meridian as a dive computer Workload settings (pulse limits) English 3.2.4 By pressing SEL/ESC button in this menu the Heart Rate (HR) high value starts to flash. By pressing the +/UP or –/DOWN button the value can be changed. By pressing SEL/ESC button the low value starts to flash. By pressing +/- the value can be changed. By pressing SEL/ESC again the mode starts to flash. Possible selections are pulse or off. By pressing SEL/ESC the mode will be entered.
3. Meridian as a dive computer By pressing SEL/ESC button the function starts to flash and you may select On or Off by pressing the +/UP or –/DOWN button. The selection is confirmed by pressing SEL/ESC button. L5. L5 is the most conservative setting. The selection is confirmed by pressing SEL/ ESC button. Alarm depth Micro Bubble level more about diving with the MB F NOTE: levels, read chapter: Diving with MB Status 3.3.
3. Meridian as a dive computer 3.3.7 Setting the Backlight on duration English takes place in dive mode, in the log book, alarm settings, altitude settings etc. By pressing SEL/ESC button on this menu the backlight duration field at bottom row starts flashing. By pressing the +/UP or –/DOWN button you may scroll between user presettable on time from 4 up to 60 seconds. By pressing SEL/ESC button in this menu the style of units field value starts to flash.
3. Meridian as a dive computer 3.3.9 Deactivating the water contacts WARNING If you chose the option “Water contacts off”, Meridian will turn on with a delay of up to 1 minute into the dive. This will affect functioning of the dive computer. Make sure the Meridian is on the surface mode before starting the dive. By pressing SEL/ESC button on this menu the on/off field at the bottom row starts flashing. By pressing the +/UP or –/DOWN button you may switch between active or inactive water contacts.
3. Meridian as a dive computer be masked by the continuous alarm and you cannot hear the first one. English 3.4.2 Dive time interval Setting the depth incremental alarm With this alarm you can set repetitive depth alarms at given depth increments. By pressing the SEL/ESC button in this menu the incremental alarm depth starts to flash. By pressing the +/UP or –/DOWN button you may select the alarm value from 5 to 100 meters (20..330 feet).
3. Meridian as a dive computer By pressing the SEL/ESC button at the PULSE menu the low heart rate value starts to flash. By pressing the +/UP or –/ DOWN button you can set the value from 25 to 100 beats per minute. By pressing SEL/ESC button the value will be confirmed and function activation starts flashing. By pressing +/- you may select between on/ off. By pressing SEL/ESC button the alarm will be confirmed. Example: The HR alarm goes off if the heart rate reaches 40 or less beats per minute 3.4.
3. Meridian as a dive computer Water density 3.5 Algorithm selection You may select your Meridian operation mode between SCUBA, GAUGE and APNEA modes. When Meridian has not been submerged for a while the display will appear as follows: Meridian shown below has been dived in GAUGE mode and the NO CHANGE lock is still on for another 4 hours. English may change the value between 1000 and 1050 gram/liter (58417..61339 Grains/ gallon). By pressing the SEL/ESC button the value is confirmed.
3. Meridian as a dive computer 3.6 Diving with Meridian The functions of the buttons during diving are summarized in the table below. Note that Meridian can be set to three dive modes: SCUBA, APNEA and GAUGE. Due to the operation differences also buttons have different functions in each mode.
3. Meridian as a dive computer Dive time information on MB levels, please refer to chapter 3.11.15 Diving with MB levels. 3.6.2 English Current depth Display configuration during the dive Throughout the dive, Meridian displays the current depth (upper left corner), the elapsed dive time (upper right corner) and the no-stop or decompression information (middle row). Max depth No-stop time Dive display limits (imperial) Depth: the depth is given in 10cm resolution when metric mode.
3. Meridian as a dive computer 3.7 3.7.1 Altitude diving Current Altitude Class Prohibited Altitude Class Altitude classes, altitude warning and no-fly time after a dive Going to altitude is in a way similar to starting an ascent from a dive: you expose your body to a lower partial pressure of nitrogen and consequently you start offgassing. After a dive, given the higher nitrogen loading in your body, even reaching an otherwise negligible altitude can potentially cause decompression sickness.
3. Meridian as a dive computer Flying while Meridian displays the NO FLY symbol can result in serious injury or death. 3.7.2 Altitude and the decompression algorithm Atmospheric pressure is a function of altitude and of weather conditions. This is an important aspect to consider for diving, because the atmospheric pressure surrounding you has an influence on ongassing and offgassing of nitrogen.
3. Meridian as a dive computer Current Altitude Class Ascent to Altitude Class 4 prohibited 3.8 No-dive warning after a dive If Meridian detects a situation of increased risk (due to the potential microbubble accumulation from previous dives or a CNS O2 level above 40%), the NO DIVE symbol will appear on the display to advise you against performing another immediate dive right away. The suggested time interval that you should wait prior to diving is shown on the dive mode display.
3. Meridian as a dive computer SOS If you stay above a depth of 0.8m/3ft for more than 3 minutes without observing a prescribed decompression stop, Meridian will switch into SOS mode. Once in SOS mode Meridian will lock up and will be inoperable as a dive computer for 24 hours. If it is used for diving within the 24hours of an SOS lock, it will automatically switch to GAUGE mode and provide no decompression information.
3. Meridian as a dive computer pressure oxygen, and can vary in terms of the exact level of partial pressure they happen at. It is commonly accepted that partial pressures up to 1.4 bar are tolerable, and several training agencies advocate maximum oxygen partial pressures up to 1.6 bar. Long exposure effects to oxygen partial pressures over 0.5 bar due to repeated and/ or long dives. These can affect the central nervous system, cause damage to lungs or to other vital organs.
3. Meridian as a dive computer something did not work as planned. • Diving with two gas mixtures represents a much higher risk than diving with a single gas mixture, and mistakes by the diver may lead to serious injury or death. • During dives with two gas mixtures, always make sure you are breathing from the tank that you intend to breathe from. Breathing from a high oxygen concentration mix at the wrong depth can kill you.
3. Meridian as a dive computer accordingly, basically reflecting the fact that you will finish the dive using Gas 1 only. if after Meridian has changed F NOTE: the decompression schedule to reflect and the value of the CNS O2 will be flashing in the lower right corner. The flashing will continue until the value of CNS O2 drops under 75%. the missed gas switch, you descend again below the MOD for Gas d, Meridian reintroduces Gas d into the calculations and the decompression schedule changes accordingly.
3. Meridian as a dive computer Entering decompression Meridian can activate a warning when the first mandatory decompression stop appears. This alerts the diver to the fact that a direct ascent to the surface is no longer possible. This warning applies to dives with the dive computer set to L0 only. Meridian emits a sequence of audible beeps and the DECO STOP symbol flashes, both for 12 seconds, when the no-stop time ends and a mandatory (L0) stop is required before reaching the surface. 3.11.
3. Meridian as a dive computer Along these lines, Meridian employs a variable ideal ascent rate: its value ranges between 7..20m/min / 23..66ft/min and the actual breakdown by depth range is listed in the chart below.
3. Meridian as a dive computer the required stop, Meridian will trigger an alarm: the value of the current depth and the value of the required stop depth will flash, and a sequence of beeps can be heard. This will continue for as long as you stay 0.5m/2ft or more above the required stop. English CNS O2 reaches 100%, Meridian will emit a sequence of audible beeps for 12 seconds and the value of the CNS O2 will be flashing in the lower right corner.
3. Meridian as a dive computer shallower than 6.5m/20ft and there are no decompression obligations, you can press –/DOWN button to restart the countdown manually. Safety Stop icons Remaining time span (minutes / seconds) 3.11.14 Activating the backlight To activate the backlight, press LIGHT. The default duration of the backlight is 6 seconds, but you can set it between 4 and 60 seconds in one second increments. The backlight is not available when the BATTERY CHANGE warning appears. 3.11.
3. Meridian as a dive computer When diving with an MB level other than L0, Meridian still carries out all calculations relating to L0 in the background. To understand the relation between set MB level and the underlying L0 calculation and how the information appears on the display, we shall use the example of a dive with MB L3 set in the dive computer. L3 information on display L0 information in background Display details No-stop No-stop Display shows L3 no-stop time.
3. Meridian as a dive computer 3.11.17 Display of underlying L0 decompression information During the dive, the information displayed is always relative to the active MB level. However, the underlying L0 data is available as one of the alternate information fields. When pressing the +/UP button the appropriate number of times, the L0 information will be visible instead of the active MB level information for 5 seconds, after which it is replaced again by the information relative to the active MB level.
3. Meridian as a dive computer WARNING If decompression is already required this information remains in the middle row. In that case the PDIS counter is not shown but only the PDIS symbol is flashing for the 2 minutes that are recommended to remain in the PDIS zone. WARNING Even when performing a PDI stop, you still MUST perform a safety stop at 5m/15ft for 3 to 5 minutes.
3. Meridian as a dive computer 1 second past 10 o’clock combined with water temperature that is 20˚C. Time of day Water temperature Alternative information can be selected in the following order: 1. Max depth (after 1m/3feet ascent detected) 2. Temperature 3. Average depth 4.
3. Meridian as a dive computer Maximum depth Dive duration English 3.13 APNEA mode Meridian has an advanced APNEA diving mode. The main features include faster sampling rate than in normal SCUBA mode and alarm functions tailored to APNEA diving. Meridian measures the depth in APNEA mode every 0.25 seconds to ensure the precise maximum depth. In logbook the data is saved in 1 second intervals.
4. Meridian accessories 4. 4.1 Meridian accessories HR belt Meridian receives fthe signal of the SCUBAPRO heart rate belt. The position to wear a HR belt is shown below. Adjust the strap so that it is comfortable to wear but so that it holds on the place. When using a diving suit the HR belt must be directly against the skin. Moisten the electrode areas if your skin is dry or when using a dry suit. Check the operation conditions and depth rating of the HR belt from the unit or its package. 4.
5. MERIDIAN PC INTERFACE 5.1 Cradle English 5. Meridian PC interface The communication between Meridian and PC/MAC is possible only with a cradle. Select the COM port that is used for Meridian cradle. 4. Place the Meridian on the cradle The communication between the Meridian and the cradle is established via the contact on the case. Therefore if the water contact or the spring contact of the cradle has dirt on the surface, this should be cleaned with a piece of clothing before use.
5. Meridian PC interface Read chapter 3.11 Warnings and alarms about the possible selections that you can modify on your Meridian. You may also change the shown units between metric/imperial. Select Extras -> Options -> measurement units: 5.2.2 Change warnings/settings of the Meridian and reading dive computer info By selecting Extras -> Computer settings you can enable/disable warnings that cannot be changed at Meridian unit via menus.
6. Taking care of Meridian 6.1 Technical information English 6. Taking care of Meridian Operating altitude: with decompression – sea level to approximately 4000m/13300ft without decompression (GAUGE mode) – at any altitude Max operating depth: 120m/394ft; resolution is 0.1m until 99.9m and 1m at depth deeper than 100m. Resolution in ft is always 1ft. Accuracy is within 2% ±0.2m/1ft. Decompression calculation range: 0.
6. Taking care of Meridian 6.3 Replacing the battery in Meridian WARNING We recommend having the battery of Meridian replaced by an authorized SCUBAPRO dealer. The change must be made with particular care in order to prevent water from seeping in. The warranty does not cover damages due to an improper replacement of the battery. Meridian stores the tissue saturation information in non-volatile memory, so the battery can be replaced at any time between dives without loss of information.
6. Taking care of Meridian 6.4 Warranty English Meridian has a two-year warranty covering defects in workmanship and functioning. The warranty only covers dive computers which have been bought from an authorized SCUBAPRO dealer. Repairs or replacements during the warranty period do not extend the warranty period itself. Excluded from warranty coverage are faults or defects due to: • excessive wear and tear • exterior influences, e.g.
7. Glossary 7. 56 Glossary AVG: Average depth, calculated from the beginning of the dive or from the time of reset. CNS O2: Central Nervous System oxygen toxicity. DESAT: Desaturation time. The time needed for the body to completely eliminate any nitrogen taken up during diving. Dive time: The time spent below a depth of 0.8m/3ft. Gas 1, Gas d: Refers to the main gas (1) and the decompression gas (d) when using the multi gas option of the ZH-L8 ADT MB PMG algorithm.
Press and hold: The act of pressing and holding one of the buttons for 1 second before releasing it. INT.: Surface interval, the time from the moment the dive is closed. SOS mode: The result of having completed a dive without respecting all mandatory decompression obligations. Stopwatch: A stopwatch, for example to time certain legs of the dive.
8. Index 8.
