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Cochran Nemesis IIa NITROX, User Manual

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Cochran Nemesis IIa NITROX User Manual Download Page 42

42

NOTE:  If both CNS and OTU levels are greater than 75 percent, the more critical of
the two's percentage will be displayed.

FIG-15

OXYGEN TOXICITY WARNING DISPLAY

Maximum PPO2 Alarm:

This alarm, settable via the optional Analyst interface, allow you to set a
desired maximum PPO2 level from 0.5 to 1.6 ATA.  Should you exceed this
setting, the TU will issue the double chirp toxicity alarm once per minute.  The
factory setting for this alarm is 1.6 ATA.

Summary of Contents for Nemesis IIa NITROX

Page 1: ...anyone other than an authorized Cochran Undersea Technology dealer will void this warranty All plastics o rings batteries or damage due to accident abuse modification or tampering are NOT covered STA...

Page 2: ...nterference in a residential situation However there is no guarantee that interference will not occur in a particular installation If this equipment does cause interference to radio or television rece...

Page 3: ...r more of the following patents US 4949072 4999606 AUS 591804 EUR 0305450 Other patents pending All specifications subject to change without prior notice Nem esis is a trademark of Cochran Consulting...

Page 4: ...apability 10 Equivalant Air Depth 11 CNS and OTU Oxygen Toxicity 11 Installation 13 Activation 13 Operating Modes Self Diagnostic Mode 15 Surface Mode 16 Predive Prediction Mode 18 CNS OTU Toxicity Pe...

Page 5: ...rameter Alarm 40 Ascent Rate Alarm 40 Low Battery Voltage 40 Gauge Mode Alarm 41 Two Minute Warning 41 60 Foot Decompression Stop Warning 41 Entering Emergency Decompression Mode 41 Oxygen Tolerance U...

Page 6: ...st Software Package 61 Minimum Hardware Configuration 61 Iinstallation of the DCI Software to the PC 62 Quick Start 62 Detailed Software Installation 62 Installation of the Data Probe to the PC 63 Att...

Page 7: ...7 THIS PAGE INTENTIONALLY LEFT BLANK...

Page 8: ...your NEMESIS IIa NITROX to your regulator as well as providing information on how to activate your unit III OPERATING MODES This section illustrates a typical display in each of the various operating...

Page 9: ...ou should wait before diving in order to off gas all residual nitrogen present as a result of this altitude change This adaptation time is displayed as Time To Fly Should you wish to begin diving prio...

Page 10: ...ct They are simply used as a benchmark with the necessity of both being met in order to allow the algorithm switching to Mix 3 We find that most divers participating in this type of extreme diving usu...

Page 11: ...AD based upon the oxygen percentage entered This equation is 1 O2 D 33 EAD 33 79 Where O2 is entered in decimal form and D is the actual depth in feet For example if you were diving with NOAA II 36 ox...

Page 12: ...In addition to this audible warning the WARNING legend will appear and flash AND the TEMPerature digits will be replaced with the current calculated CNS Oxygen Toxicity percentage This warning will c...

Page 13: ...lator system to the place where your purchased your NEMESIS IIa NITROX The Tank Unit TU clips to a low pressure hose close to the first stage When clip ping the TU onto the low pressure hose a rolling...

Page 14: ...or a longer period of time than is required to manually activate the TU This same rotating or tapping action is used to select the alternate display The alternate display is shown for three seconds be...

Page 15: ...enters the Surface Mode Fig 1 Self Diagnostic Mode Explanation of Page Layouts The following pages provide a snapshot of the screen displays for each of the computers various functional modes showing...

Page 16: ...e time TANK pressure and MAXimum DEPTH of the last dive The Alternate Display shows the last dives BOTTOM time and breathing parameter BP The following sample displays are of the Surface Mode FIG 2 Ma...

Page 17: ...17 Surface Mode FIG 3 Alternate Display LEGEND MEANING VALUE SHOWN PAGE BOTTOM bottom time of last dive 1 26 1hour 26 minutes 33 BP ending breathing parameter 33 34 of last dive...

Page 18: ...ments via the optional Analyst PC Interface There is only a Main Display in this mode The WU will display the DEPTH TANK pressure and the lesser of the NDC no decompression time or AIRtime remaining f...

Page 19: ...y Display At the conclusion of the Predive Prediction Mode your dive computer will display the current Central Nervous System CNS Toxicity and Oxygen Tolerance Unit OTU Toxicity levels The CNS and OTU...

Page 20: ...n Display and is displayed for three sec onds FIG 6 Main Display LEGEND MEANING VALUE SHOWN PAGE REMAIN TIME NDC used to identify the 1 00 36 O2 Mix Display TANK indicates the Mix 1 O2 21 5 37 percent...

Page 21: ...unit returns to Surface Mode There is only a Main Display for this mode FIG 7 Main Display LEGEND MEANING VALUE SHOWN PAGE REMAIN TIME NDC used to identify the 0 00 36 Battery Altitude Display TANK al...

Page 22: ...ppears It will appear for three seconds before returning to the Logbook Mode s Main Display Your NEMESIS IIa NITROX will return to the Surface Mode thirty seconds after the final selected log has been...

Page 23: ...PAGE REMAIN TIME AIR the minimum calculation 0 20 20 minutes 36 of either NDC AIR or the total decompression time recorded for this dive CEIL maximum ceiling stop 0 feet 34 required BP average breath...

Page 24: ...ascending CEIL ceiling stop 0 feet 34 required if any BOTTOM bottom time 0 34 34 minutes 33 TANK current tank pressure 1856 psi 37 DEPTH current depth 46 feet 35 The Subsurface Mode has a Main and an...

Page 25: ...ND MEANING VALUE SHOWN PAGE REMAIN TIME AIR greater of the two 2 47 2hours 47 minutes 36 or of remaining AIR time REMAIN TIME NDC TEMP current temperature 58 deg F 37 BP current breathing parameter 34...

Page 26: ...ime displayed if you so desire CEILING is the depth to which you must ascend BUT NOT EXCEED for your first emergency decompression stop The WU display will indicate the various ceiling stop depths as...

Page 27: ...15 15 minutes 37 remaining at this CEILing CEILING depth which you 20 feet 34 MUST NOT ascend above BOTTOM total bottom time 1 56 1hour 56 minutes 33 TANK current tank pressure 1654 psi 37 DEPTH curr...

Page 28: ...is provided on the Alternate Display while in Emergency Decompression Mode LEGEND MEANING VALUE SHOWN PAGE REMAIN TIME AIR remaining air time 0 30 30 minutes 36 TEMP water temperature 68 deg F 37 BP b...

Page 29: ...ck below the CEILing If five minutes elapse without this violation being corrected the dive computer enters its Gauge Mode EXCEEDING A 90 FOOT CEILING STOP A Ceiling depth of greater than 60 feet will...

Page 30: ...ALUE SHOWN PAGE TEMP water temperature 55 degreesF 37 ASCENT rate at which you 31 40 feet per minute 32 are ascending BOTTOM current time either 3 36 3 hours 36 minutes 33 or on surface or submerged S...

Page 31: ...31 SECTION III EXPLANATIONS...

Page 32: ...ency Decompression Mode or Gauge Mode Ascent rate is averaged over a running four second period For purposes of the description this manual will just refer to ascent rate with the reader understanding...

Page 33: ...e you will quickly be able to identify if you are approaching 100 maximum limit The Ascent Rate Bar Graph is set at the factory to display SPEED Batt This legend is illuminated when either the battery...

Page 34: ...le the dive to 66 feet would display a BP of 69 23 x 3ATM s 69 With your dive computer you can immediately see that your rate remained unchanged from the first to second dive If the actual psi per min...

Page 35: ...the TU s current battery voltage as a factor of ten For example if the TU s battery voltage is 5 8 volts the two digits under the DEPTH legend would display 58 If the battery voltage was 5 3 volts the...

Page 36: ...ion Mode The remaining airtime is always displayed on the Alternate Display Logbook Mode If during the profile being displayed the minimum recorded remain ing time data was remaining airtime the Alter...

Page 37: ...es or less of bottom time for a given depth during the Predive Prediction Mode the tank digits will flash This flashing will only occur for the predicted depths which apply Logbook Mode During the fir...

Page 38: ...altitude after diving The time calculated includes an additional 12 hour surface time for added safety For example if it would take your body three hours to eliminate all residual nitrogen the time t...

Page 39: ...one time five chirp audible alarm If you use all of the usable tank pressure you will still have a safety reserve of 500 psi The point at which the 1 2 Tank Pressure Alarm will sound is easily determ...

Page 40: ...ow limits for Breathing Parameter If your Breathing Parameter is greater than your high limit or less than your low limit your dive computer will issue a five beep alarm once each minute until your Br...

Page 41: ...sue a one time five chirp audible warning Entering Emergency Decompression Mode Should you enter Emergency Decompression Mode the TU will issue a one time five chirp audible alarm Oxygen Tolerance Uni...

Page 42: ...FIG 15 OXYGEN TOXICITY WARNING DISPLAY Maximum PPO2 Alarm This alarm settable via the optional Analyst interface allow you to set a desired maximum PPO2 level from 0 5 to 1 6 ATA Should you exceed th...

Page 43: ...ent When I tapped the TU on it did not issue the five confirmation beeps WHY The TU may already be on Turn your WU on to see if the TU is transmitting data If it is not check the batteries to see if t...

Page 44: ...the o rings install new batteries and reinstall the battery caps You may also need to use a clean eraser or a burnishing cloth to completely clean the contacts Can I transport my dive computer in a wa...

Page 45: ...45 SECTION IV CARE AND MAINTENANCE...

Page 46: ...computer The WU s rubber strap may be conditioned with silicone spray especially developed for use with SCUBA equipment You will find this type of silicone spray at your local dive shop Care should a...

Page 47: ...ing sure not to cross thread the battery cap NOTE The one minute delay allows the power circuit responsible for maintaining power to the TU during a battery change time to recharge Battery Care Two se...

Page 48: ...be at least three feet and reset if necessary Battery Voltage The battery voltage in your TU and WU will be recorded and new batteries installed if necessary Battery Drain Test The amount of current d...

Page 49: ...49 THIS PAGE INTENTIONALLY LEFT BLANK...

Page 50: ...50 SECTION V TECHNICAL SPECIFICATIONS...

Page 51: ...2 Alternate Display Subsurface Mode 1 Main Display 2 Alternate Display Predive Prediction Mode CNS OTU Toxicity Display Oxygen Percentage Display Battery Altitude Display Emergency Decompression Mode...

Page 52: ...minute Second by second Profiles 13 6 hours HARDWARE Casing Fiberglass reinforced ABS Plastic Lens Material Polycarbonate POWER TANK UNIT WRIST UNIT Battery 4 AA 2 N Battery type Alkaline Alkaline TUR...

Page 53: ...53 THIS PAGE INTENTIONALLY LEFT BLANK...

Page 54: ...54 SECTION V ACCESSORIES...

Page 55: ...ed by a photocopy of the original sales receipt Should repair be required you may return your Field Programmer to the place of purchase LIMITATIONS This warranty DOES NOT cover any damages that occur...

Page 56: ...heNEMESIS IIaNITROXDiveComputerandtheFieldProgrammerare tobeusedonlybydiverstrainedandcertifiedintheuseofNitroxbreathinggasmixes by an accredited certifying agency NOTE The Field Programmer is NOT wat...

Page 57: ...TE For Mix 1 the far upper left digit displayed a 1 i e 1 3 1 2 1 1 For Mix 2 this digitwilldisplaya2andforMix3 thedigitwillbea3 Thenumbersfollowingthedash signify either the 10 s 1 s or 1 10 s digit...

Page 58: ...desired percentage of added conservatism from 00 to 50 percent This option programming is signified with a C in the upper left corner of the WU display 14 The last programming option is the maximum de...

Page 59: ...59 Depth Limit for Mix 3 Activation nitrox Cylinder Size in Liters Elapsed Bot Time for Mix 3 Activation nitrox...

Page 60: ...stics screen graphic profile screen and logbook screen are grouped together so you can scan from dive to dive in any screen type and instantly recall the other screens for that particular dive Minimum...

Page 61: ...must also do so with the Analyst system 2 Insert the Analyst software diskette into your diskette drive We will assume that this is drive A To install the software type A and press ENTER Then type INS...

Page 62: ...nector YourPersonalComputerCOM1orCOM2portmayhavea9 pinconnector instead of a 25 pin connector In this situation you will need to purchase a 25 to 9 pin adapter Adapters are available at most computer...

Page 63: ...to the sport dive computer will often cause the divecomputertoturnon withresulting beeps Thisisnormal ItisNOTnecessary for the dive computer to be on for data to be uploaded However do not start the u...

Page 64: ...ght or Allows you to move up and down the top bar menu selections Depending upon which screen you have displayed this will also move you between dives one dive at a time HOME This key takes you to the...

Page 65: ...ase enter name of new file to be created At this point if you enter a file name using up to eight characters or numbers from the list of files displayed The file name you create will correspond to one...

Page 66: ...s battery voltage time to fly etc Current data refers to the values calculated at the time of the uploading For these reason current data will change with each upload THIS DIVE A wealth of information...

Page 67: ...m of the profile you may see very short colored vertical lines These lines refer to different warnings that the dive computer has posted Should you move the left marker line over one of these little v...

Page 68: ...the smoothing of the graph with 0 representing no smoothing and 9 repre senting maximum smoothing Since Profiles are recorded at the sample rate specified it is recommended that you use the finest sam...

Page 69: ...you configure the DISPLAY and ALARM functions of your dive computer Various HELP screens are available for each of these sections by pressing F1 once a selection is highlighted To make a change to yo...

Page 70: ...LE This function allows the user to create a file that is compatible with the Diver s Alert Network s Project Dive Safety software package The interval at which this data is recorded is based upon the...

Page 71: ...Dives This identifies the total number of dives made that entered decompression Total Decompr Time This identifies the total time spent in decompression Total of Warnings This identifies the total nu...

Page 72: ...the dive Breathing Parameter This is the ending Breathing Parameter for the dive Min Battery Voltage This is the minimum recorded battery voltage of the dive Time To Fly This is the wait time before f...

Page 73: ...e total volume of the tank s that you entered for this dive to be used in workload calculations Sea Fresh Water This identifies they type of water in which the dive was made Maximum Ascent Rate This i...

Page 74: ...ines the resolution in which your dive profiles are created You may select from 1 second to 30 second resolution For each 1 second of profile store period you gain 13 hours of profile storage space bo...

Page 75: ...ture compensation in the computer s algorithm You may wish to disable this function if you were diving in a dry suit Use the left or right mouse button to toggle between the two choices When the desir...

Page 76: ...highlight this option with the middle mouse button and using the keyboard enter the desired setting and press ENTER Enter Blend 2 Oxygen in NITROX mixture This option allows you to enter the desired...

Page 77: ...ption with the middle mouse button and using the keyboard enter the desired setting and press ENTER Select Ascent Rate Bar Graph This option determines whether you wish the bar graph to indicate the s...

Page 78: ...is setting is suggested for deep technical diving which usually accompanies fast descent rates For recreational diving a slower responsiveness is suggested This will prevent large changes in the remai...

Page 79: ...79...

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