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Cochran GEMINI Owner's Manual

With monitor wu
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For your records, please fill in the following:
Serial Number of the Tank Unit: _______________________________
Serial Number of the Wrist Unit: _______________________________
Your Name: _______________________________________________
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www.divecochran.com
Cochran
GEMINI
With
Monitor WU
Owner's Manual
English – Imperial
Ver: Gemini.Mon.1.50
Manual Part Number: 4300812

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  • Page 1 GEMINI With Monitor WU Owner’s Manual English – Imperial Ver: Gemini.Mon.1.50 Manual Part Number: 4300812 For your records, please fill in the following: Serial Number of the Tank Unit: _______________________________ Serial Number of the Wrist Unit: _______________________________ Your Name: _______________________________________________...

  • Page 3: Product Introduction

    Product Introduction: Your GEMINI Dive Computer from Cochran Undersea Technology is one of the most advanced instruments made for this application. The GEMINI consists of two component parts, the Tank Unit (TU) and the Wrist Unit (WU), the TU contains the High Pressure Transducer Assembly, Depth/Altitude Sensor, and the computer‟s electronics.

  • Page 4: Tank Unit Touch Contacts

    PC for extracting information or configuring the unit, and determining water conductivity. When Contacts 1 & 2 are shorted, the GEMINI TU can detect the difference between wet fingers, metal objects, fresh water, salt water, and a PC interface cable.

  • Page 5: Wrist Unit Side Touch Contacts

    If the WU is activated and not in communications with the TU, it will turn off after 15 minutes. The GEMINI WU will not turn on if the battery voltage is less than 2.0 volts, or a fault is detected during the self-test.

  • Page 6: Main Operating Modes

    1. After 60 minutes if no tank pressure is sensed and no dive is made. 2. After all 16 half-time compartments are completely off-gassed on repetitive dives. NOTE: The GEMINI TU will not enter the sleep mode or turn off as long as cylinder pressure is being applied to the TU.
  • Page 7 After completion of the Self-Diagnostic mode or after the Post Dive Interval following a dive, the GEMINI enters the Surface Interval. This period has two screens, a Primary and an Alternate. To switch to the Alternate Screen just tap once firmly on the face of the unit.
  • Page 8 (Altitude compensation is seamless up to 15,000 feet above sea level). The six ranges are for display purposes only: The GEMINI actually senses and computes extremely small altitude changes and hence, is called “Seamless”. The term “Barometric Altitude” is used instead of just “Altitude”...

  • Page 9: Dive Mode - Air/Single Gas Nitrox

    Depth, displayed in one-foot increments. Bottom Time will begin once the GEMINI WU senses that the diver has descended below five feet and continues until the diver has ascended above three feet. The maximum Bottom Time displayed is 9...
  • Page 10 The Alternate Screen will display the current FO value that the unit is using in its NDC calculations, the current CNS and OTU values and the Maximum Depth. (Figure 14 & 14a) A Depth Alarm, which can be set to warn the diver should a certain depth be exceeded, is set at 130 feet from the factory.

  • Page 11: Ascent Rate Bar Graph

    There is no compensation above 75 degrees F. Bottom Time will begin once the GEMINI senses that the diver has descended below five feet (see Training Mode) and continues until the diver has ascended above three feet. The maximum Bottom Time displayed is 9 hours 59 minutes.
  • Page 13 Should a no-decompression limit be overstayed, the GEMINI will enter the Decompression Mode. In this mode, the Ceiling digits will display the depth at which the diver must stop and not ascend above during final ascent. The “TEMP” legend and two digits will be replaced with the “CEIL”...

  • Page 14: Post Dive Interval Mode - Air/Single Gas Nitrox

    During the first ten minutes (or up to thirty if the unit is in the Training Mode) after a dive, the GEMINI WU is in the Post Dive Interval. The flashing "SURF" legend and a Surface Time of less than ten minutes indicate this. Should another dive be commenced before the completion of the Post Dive Interval, that dive will be considered an extension of the previous dive.

  • Page 15: Confined Water Protocol (Training Mode)

    1-foot seas. In the Training Mode, the GEMINI enters the Dive Mode at a depth of 2 feet instead of 5 feet and will exit the Dive Mode at 1 foot instead of 3 feet. Also the Post Dive Surface Interval ®...

  • Page 16: Tu Clock Programming

    24-hour format. The Clock will continue to run when the GEMINI is in the Dive Computer Mode. The GEMINI can be placed into the Clock Mode from the Dive Computer Mode when the unit is in the Normal Surface Interval.

  • Page 17: Tu Clock Programming Screens

    TOUCH PROGRAMMING MODE: NOTE: To enable the Programming Mode, the GEMINI must be on the Surface, not in the Post Dive Interval and cylinder pressure must be zero. NOTE: All audible and visual alarms are suspended while the GEMINI is in the Programming Mode.

  • Page 18: Programming Menu - Wrist Unit

    PROGRAMMING MENU - WRIST UNIT: The following table lists the various programming choices with their display identification and figure number, it should be noted that the Wrist Units programming choices are always the same regardless of how the GEMINI is configured. Identification Description Figure Page Misc.

  • Page 19: Logbook Mode

    Alternate Screen. The Logbook is accessed via Touch Contact Programming (see page 13). This enables the diver to view dive statistics; the GEMINI WU has the ability to provide diving data for the most recent 12 dives. The most recent dive will be displayed first.

  • Page 20: Logbook Screens

    NOTE: The overall Dive Number that is displayed on the Logbook Menu screen (Figure 99a) permits the diver to identify the total number of dives made with that GEMINI WU. If the logbook example shown is the most recent dive made, it can be readily identified that 9...
  • Page 21 Figure 09 displays a typical Primary Screen of the Logbook of a Decompression Dive. Figures 10 & 10a displays the Alternate Screen for an Air Only, a Nitrox and PO Deco Dive.

  • Page 22: Programming Menu - Air Only

    PROGRAMMING MENU - TU - AIR ONLY: The following table lists the various programming choices with their display identification and figure number. Identification Description Figure Page Clock – if enabled PreDive Prediction Misc. Information Depth Alarm, Max value is 320 feet. Added Conservatism, Max allowed value is 50%.

  • Page 23: Programming Menu - Single Gas Nitrox

    PreDive Prediction information at the touch of the Contacts. The PreDive Prediction of the GEMINI starts at 30 feet and increases in 10 feet increments. PreDive Predictions will terminate when the No-Decompression (NDC) time prediction reaches two minutes or a maximum depth of 320 feet is reached.
  • Page 24 The InFormation display is accessed via the Programming Mode. The InFormation display contains two screens, to switch between the two screens bridge Contacts 1 & 2 with wetted fingers. The information presented will depend on the configuration of the dive computer. The information in the upper right of first screen indicates whether unit is in the Constant FO2 or PO2 Mode and the number of gas blends the unit is enabled for.

  • Page 25: Depth Alarm - Air/Single Gas Nitrox

    This depth can be set from 0 to 320 feet in one-foot increments. TOUCH PROGRAMMING - TU - CONSERVATISM: This programming function allows the diver to input an added degree of Conservatism into the GEMINI‟s nitrogen algorithm. Via Touch Programming the Conservatism can be set from 0 to 50%.

  • Page 26: Single Gas Nitrox

    TOUCH PROGRAMMING - TU - SETTING TU ADDRESS CODE: The Address Code that the GEMINI TU uses to identify the WU can be programmed from 31,000 to 63,000. The Address Code is the TU‟s serial number. WARNING INDICATIONS: Failure to observe audible and/or visual warnings and take corrective action may result in injury or death.

  • Page 27: Sensor Warning Mode

     For High OTU, see “OXYGEN TOXICITY FACTORS” on page 26. SENSOR WARNING: The GEMINI TU has the capability of monitoring the integrity of its' sensors both the low-pressure (depth/altitude), the temperature and the high-pressure (cylinder pressure). When the computer detects an error in one of the transducers, the diver is alerted to this condition by the illumination of the “WARNING”...

  • Page 28: Sensor Warning Screen

    OXYGEN TOXICITY FACTORS: The GEMINI has the ability to track Oxygen Toxicity levels for the Central Nervous System (CNS) as well as the Mission Oxygen Tolerance Units Dose (OTU). In addition, a maximum Partial Pressure of Oxygen (PO2) warning alarm can also be set. While most other audible alarms of the dive computer consist of five...

  • Page 29: Central Nervous System Toxicity

    Oxygen above 0.5 ATA is Pulmonary Oxygen Toxicity or sometimes called WHOLE BODY, which must be tracked properly. The GEMINI tracks OTU based on Dr. Bill Hamilton‟s „REPEX‟ method of oxygen exposure management. The OTU Dose is an exponential function of oxygen partial pressure and time.

  • Page 30: Gemini - Two Gas Nitrox

    Blend switching. While most other Nitrox dive computers limit the diver to the use of a single gas blend or percentage of oxygen, the GEMINI allows the diver to use two different gas blends during a dive. These two gas blends are commonly referred to as the Normal or Bottom Gas Blend and the Decompression Gas Blend.

  • Page 31: Surface Interval - Two Gas Nitrox

    The Decompression Mode for the Two Gas Nitrox configuration is the same as the Single Gas Nitrox refer to page 10. If the diver surfaces before satisfying his decompression obligation, the GEMINI will continue to give out-gassing credit as if it were in a dive, but at a depth of zero feet. The unit will continue to log data and perform as if actually in a dive.

  • Page 32: Post Dive Interval - Two Gas Nitrox

    Blend #2 Oxygen percentage, Allowed value 21 to 99.9. TU/WU Address code. Allowed values 31000 to 63000 NOTE: If the GEMINI is left in the Programming mode for five minutes without the contacts being touched, the unit will automatically exit the Programming Mode and return to the Surface Interval.

  • Page 33: Address Code

    Blend switching. While most other Nitrox dive computers limit the diver to the use of a single gas blend or percentage of oxygen, the GEMINI allows the diver to use three different gas blends during a dive. These two blends are commonly referred to as the Normal or Bottom Gas Blend and the First and Second Decompression Gas Blends.

  • Page 34: Surface Interval - Three Gas Nitrox

    factor is to ensure that the switch to the Deco Blend does not occur prematurely should the diver ascend early and not require use of the Deco Blend, the setting of this factor must be carefully considered. The Deco Blend switch is enabled when the diver descends below the switch depth and satisfies the time requirements and then ascends to the programmed switch depth.

  • Page 35: Post Dive Interval - Three Gas Nitrox

    Max value is 99 feet. TU/WU Address code. Allowed values 31000 to 63000 NOTE: If the GEMINI is left in the Programming mode for five minutes without the contacts being touched, the unit will automatically exit the Programming Mode and return to the Surface Interval.

  • Page 36: Blend #1 O % - Three Gas Nitrox

    TOUCH PROGRAMMING - DEPTH ALARM - THREE GAS NITROX: The Depth Alarm Programming Procedure is the same as the Single Gas Nitrox, refer to page 23. TOUCH PROGRAMMING - CONSERVATISM - THREE GAS NITROX: The added Conservatism Programming Procedure is the same as the Single Gas Nitrox, refer to page TOUCH PROGRAMMING - CYLINDER SIZE: The Cylinder Size Programming Procedure is the same as the Single Gas Nitrox, refer to page 23.

  • Page 37: Address Code

    (Nitrox), which is referred to as ”Constant FO ” and is commonly found in open-circuit systems and in semi-closed circuit rebreathers. The GEMINI has this capability, but also computes using a “Constant PO ” as commonly found in closed-circuit rebreathers.

  • Page 38: Dive Mode - Single Gas Po

    Figure 04b shows the display with residual Nitrogen (a repetitive dive), figure 05a shows the alternate screen with residual nitrogen. DIVE MODE - SINGLE GAS PO2: The Dive Mode for the PO configuration is the same as the Single Gas Nitrox. The Primary Display Screen will display the current Calculated FO2 of the Breathing Gas, in the lower center of the display, based on the Depth and PO Setting.

  • Page 39: Decompression - Single Gas

    Figures 15b & 16b shows the GEMINI WU in the PO mode at the Decompression Stop. If the diver surfaces before satisfying his decompression obligation, the GEMINI will continue to give out-gassing credit as if it was in a dive, but at a depth of zero feet. The unit will continue to log data and perform as if actually in a dive.

  • Page 40: Post Dive Interval - Single Gas

    It should be noted that in the Constant PO mode the shallower the decompression stop the shorter the stop decompression time. This is a result of higher FO2s in the breathing gas as the depth decreases. POST DIVE INTERVAL MODE - SINGLE GAS PO2: The Post Dive Interval is the same as in the Single Gas Nitrox, refer to page 12 for detailed information.

  • Page 41: Fo 2 /Po 2 Mode

    Oxygen percentage of Blend, Allowed value 21 to 50. TU/WU Address code. Allowed values 31000 to 63000 NOTE: If the GEMINI is left in the Programming mode for five minutes without the contacts being touched, the unit will automatically exit the Programming Mode and return to the Surface Interval.

  • Page 42: Information Display - Single Gas

    TOUCH PROGRAMMING - INFORMATION DISPLAY - SINGLE GAS PO2: The InFormation display for the Single Gas PO2 is the same as the Single Gas Nitrox, refer to page 21. TOUCH PROGRAMMING - DEPTH ALARM - SINGLE GAS PO2: The Depth Alarm Programming Procedure is the same as the Single Gas Nitrox, refer to page 23.

  • Page 43: Fo /Po

    PC Interface, the user can specify when, or if the unit should change from CONSTANT PO mode to CONSTANT FO mode at or near the surface. BLEND SWITCHING: Depending on the configuration of the GEMINI „BLEND‟ refers to Constant FO Nitrox gas blends or Constant PO gas blends. The GEMINI is capable of...

  • Page 44: Post Dive Interval - Two Gas

    POST DIVE INTERVAL MODE - TWO GAS PO2: The Post Dive Interval is the same as in the Air only Mode, refer to page 12 for detailed information, except that if the unit has performed a gas switch. While in the Post Dive Interval the Alternate Screen will display the Oxygen percentage of the Deco Gas Blend and if the diver re-enters the Dive mode the unit will perform its‟...

  • Page 45: Programming Menu - Two Gas Po - Po To Po

    TOUCH PROGRAMMING MENU - TWO GAS PO2 - PO2 to PO2 GAS SWITCH The following table lists the various programming choices with their display identification and figure number. The Programming sequence and choices are determined by the selection of PO or FO Mode.
  • Page 46 SENSOR WARNING - TWO GAS PO2: Refer to Sensor Warning on page 25. TOUCH CONTACT PROGRAMMING SCREENS: The following are all of the screens that the GEMINI WU is capable of presenting in the Touch Programming Mode. Refer to the particular configuration for appropriate screens.
  • Page 47 TOUCH CONTACT PROGRAMMING SCREENS: The following are all of the screens that the GEMINI TU is capable of presenting in the Touch Programming Mode. Refer to the particular configuration for appropriate screens.
  • Page 50 DATA STORAGE TYPES & CAPACITY: The GEMINI has the following internal distinct ® data storage activities that can be recalled, viewed, and stored with the Analyst computer interface:  Current Variable Information: Local Time, CNS toxicity, OTU dose, OTU Mission Clock, Barometric Altitude, PBAT Battery voltage, SBAT Battery voltage, Time to Fly remaining, Current Unit Temperature, 16 tissues loading.
  • Page 51 INTER-DIVE EVENTS: The GEMINI stores important information between dives, even when the unit is not turned on. The information is stored as acquired and is called an “Inter-Dive Event”. These events can be viewed via the Professional Version of the ®...
  • Page 52 Gas Consumption is computed and updated only after 1 minutes of dive time. After cylinder pressure is applied the GEMINI will display “-.-“ for the SGC value, if the system is not being breathed on after one-minute the value will show”0”. Once the diver has been breathing for an additional one minute the SGC value will start to display the divers SGC value.
  • Page 53 See User & Environmental Adaptation, Water Temperature on page 63 for a detailed description of this function. The GEMINI is shipped from the factory with this feature set to NORMAL.
  • Page 54 NITROX computations. If this option is disabled, mixtures other than 21.0% oxygen will be disallowed. Furthermore, if this option is selected as OFF, the GEMINI WU will not compute CNS Toxicity, OTU Dose, or maximum PO2 alarm. The factory setting for this option is „On‟.
  • Page 55 Confined Water Protocol (Training Mode) - (Enabled or Disabled): This option enables the Training Mode for the GEMINI. In this mode the GEMINI will enter the Dive Mode at 2 feet instead of 5 feet and exit the Dive Mode at 1 foot instead of 3 feet. The Training Mode also permits the selection of an increased Post Dive Interval period from 10 to 30 minutes in one-minute increments.
  • Page 56 1100 dive hours at one second sampling (depending upon configuration) Profile Sampling 1 second increments * While the Gemini is capable of depths greater than 327 feet it is only rated to 327 feet. MONITOR WRIST UNIT SPECIFICATIONS: WU Activation Manual and Water...
  • Page 57 NOTE: Specifications are an additional +/- one least significant display digit due to rounding. Specifications are subject to change without notice. ENHANCEMENTS: The GEMINI is capable of having its‟ capabilities enhanced. It can be upgraded to a two-blend or three-blend Nitrox computer and/or a One or Two blend Nitrox/PO computer.
  • Page 58 The TU requires four „AA‟ batteries while the WU requires 2 alkaline „N‟ batteries. The TU may be powered by any of the following types of batteries, Alkaline (tester, non-tester, rechargeable), Lithium and Nickel Cadmium. Cochran recommends the use of ENERGIZER brand batteries. Alkaline batteries may only ®...
  • Page 59 Residual nitrogen elimination, as well as time To Fly can be viewed by turning the WU back on. CAUTION!!! DO NOT ALLOW THE GEMINI TO HAVE LOW OR NO BATTERIES FOR ANY EXTENDED PERIOD OF TIME! ACCIDENTIAL OR INTENTIONAL LOSS OF BATTERY POWER WILL CAUSE ALL PREVIOUS DIVE NITROGEN LOADING TO BE LOST.
  • Page 60 Personal Computer Interface ® The Analyst Personal Computer Interface is a complete hardware/software system that down loads data from the GEMINI dive computer to an IBM or compatible Personal ® ® Computer with a Windows 95/98/NT/Millenium/2000/XP operating system. The Analyst...
  • Page 61 12 months from the original date of shipment from COCHRAN. For purposes of establishing warranty eligibility, this date of shipment may be noted on the original Product box, or can be determined by contacting COCHRAN. Any defective Product, unless cause is specifically excluded in the "Warranty Conditions and Limitations"...
  • Page 62 Product to an Authorized Dealer to arrange service under terms of this Limited Warranty. COCHRAN will return Product to US OWNER or US Dealer via a method and carrier of its choosing. Costs for requested expedited return shipping will be the responsibility of OWNER.
  • Page 63 No Cochran Undersea Technology dealer, agent, or employee is authorized to make any modification, extension, or addition to this warranty. USER & ENVIRONMENTAL ADAPTATION: The GEMINI is one of the new breed of Dive Computers that adapts its algorithm to the users diving environment and style as originally pioneered by COCHRAN.
  • Page 64 Should it be desired to initiate a dive PRIOR to completing the adaptation time, the GEMINI will treat this dive as a repetitive dive in its algorithm, taking into account the residual nitrogen present due to travel to altitude.
  • Page 65 Personal Computer Interface. METRIC/IMPERIAL MODES: Most dive computers always compute in either Metric or Imperial units and merely convert the display to the other units. The GEMINI actually computes and displays in the selected units giving maximum accuracy and user familiarity.

  • Page 66: Table Of Contents

    Oxygen Toxicity Factors Partial Pressure of Oxygen (PO2) Central Nervous System Toxicity Oxygen Tolerance Units (OTU) GEMINI - Two Gas Nitrox Gas Blend Switching - Two Gas Nitrox Surface Interval - Two Gas Nitrox Dive Mode - Two Gas Nitrox...

  • Page 67: Po

    Address Code Warning Indications - Two Gas Nitrox Sensor Warning Mode - Two Gas Nitrox GEMINI - Three Gas Nitrox Gas Blend Switching - Three Gas Nitrox Surface Interval - Three Gas Nitrox Dive Mode - Three Gas Nitrox Decompression Mode - Three Gas Nitrox...
  • Page 68 PreDive Prediction - Two Gas PO Information Display - Two Gas PO Depth Alarm - Two Gas PO Conservatism - Two Gas PO Cylinder Size - Two Gas PO Blend #1 PO - Two Gas PO Blend #2 PO - Two Gas PO Blend #2 Depth Benchmark Blend #2 Time Benchmark Address Code...
  • Page 69 Figures Fig # Page Number Self -Test Screen Surface - No Nitrogen - FO Mode - Primary Surface - No Nitrogen - PO Mode - Primary Surface - No Nitrogen - Alternate Surface - With Residual Nitrogen - Air Only - Primary Surface - With Residual Nitrogen - FO Mode - Primary Surface - With Residual Nitrogen - PO...

  • Page 70: Programming Mode - Tu

    Fig # Page Number Programming Mode - TU - Setting Depth Alarm Programming Mode - TU - Additional Conservatism Menu 38a. Programming Mode - TU - Setting Additional Conservatism Programming Mode - TU - Cylinder Size Menu 39a. Programming Mode - TU - Setting Cylinder Size Programming Mode - TU - Normal Blend O % Menu 40a.
  • Page 72 Cochran GEMINI With Monitor WU Owner’s Manual English – Imperial Ver: Gemini.Mon.1.50 Manual Part Number: 4300812 1758 Firman Drive Richardson, Texas 75081, USA Phone 972-644-6284 972-644-6286 www.divecochran.com...

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