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Cochran Lifeguard 04-150i, User Manual

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51

Time-To-Fly

Surface Mode

: If you plan to fly after diving, you must first allow time for your

body to eliminate all of the residual nitrogen it has absorbed from diving.
Your dive computer calculates this for you and displays the hours you must
wait before safely flying or traveling to 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-to-FLY would display 15 hours (three hours plus the 12
hour added safety margin).

Logbook Mode

: In the Logbook Mode, the time-to-FLY calculated at the end of

that particular dive profile is displayed.

CAUTION:  It is always recommended that you wait at least 24 hours after

diving before flying.

AUDIBLE & VISUAL WARNINGS

In this section you will learn to recognize the audible and visual warnings that
your dive computer may issue to alert you of potentially hazardous conditions.

User Defined Maximum Depth

Via Field Programming you have the ability to define a maximum depth to which
you wish to dive.  The depth may be set from 0 to 320 feet in 1-foot increments.
Refer to the Field Programming section of this manual.  You may also set this
depth via the ANALYST

®

 Personal Computer Interface.  Should you descend to a

depth deeper than your selected maximum depth, the DEPTH digits will flash and
once every minute, the five-chirp audible alarm will sound.  The factory setting for
this warning is 320 feet.

NOTE:  The Depth Alarm is disabled during the Decompression Mode.

Two-Minute Warning

Should you have less than two minutes of remaining no-decompression time,
your dive computer will:

•

 

Issue a one time, five-chirp audible warning, and

•

 

Flash the WARNING legend on the WU.

Entering Decompression Mode

Should you enter Decompression Mode, the CTU will issue a one time five-chirp
audible alarm.

Summary of Contents for Lifeguard 04-150i

Page 1: ...SERIAL NUMBER OF UNIT _____________________________ DATE OF PURCHASE ________________________________ PLACE OF PURCHASE ________________________________ ADDRESS ___________________________________________ CITY _______________________________________________ STATE __________________________ZIP CODE __________ PHONE NUMBER ___________________________________ ...

Page 2: ...ration 12 Equivalent Air Depth 13 Oxygen Toxicity 13 CNS 14 Pulmonary Oxygen Toxicity 15 Installation 17 CTU and O2 Sensor 17 Activation 18 Shut Off 18 Operating Modes 20 Self Diagnostic mode 20 Explanation of Page Layouts 20 Surface Mode 21 Predive Prediction Mode 22 CNS OTU Toxicity Screen Display 24 Battery Altitude Screen Display 25 Programming Mode 26 Calibration Mode 30 Subsurface Mode 33 Em...

Page 3: ... Two Minute 53 Entering Deco 53 60 FT Deco Stop 53 Ceiling Violation 53 Low Battery 53 Ascent Rate 54 Gauge Mode 54 OTU 54 CNS 54 Max PO2 55 Min PO2 55 Questions Answers 56 Care and Maintenance 58 Rinsing and Cleaning 58 O2 Sensor Care 59 Battery Type and Replacement 59 Battery Care 60 Technical Specifications 61 Product Assistance Maintenance 62 Replacement Parts 63 Analyst Personal Computer Inte...

Page 4: ...Subsurface Mode Emergency Decompression Dive Showing STOP Time Primary Screen 36 12 Subsurface Mode Emergency Decompression Dive Showing TOTAL Time Primary Screen 37 13 Subsurface Mode Emergency Decompression Dive Alternate Screen 38 14 Subsurface Mode Gauge Mode Primary Screen 40 15 CNS OTU Toxicity Warning Display 42 17 Connecting Field Programming Probe 27 18 Field Programming Mode Setting Cons...

Page 5: ... care for Product will render this Limited Warranty null and void Damages or malfunction resulting from accidental or deliberate abuse tampering battery leakage exceeding maximum intended operating depth extreme heat or cold or other conditions which COCHRAN may deem to be outside the intended scope of this Limited Warranty are not covered Any modifications or repairs to Product performed by anyon...

Page 6: ... reliability quality performance accuracy and suitability for his diving style Furthermore Diver recognizes that this Product is an electronic instrument being used in a hostile environment and is subject to failure which may manifest itself in a number of ways COCHRAN and its distributors and retailers will not be held liable for any personal injuries or other damages resulting from its use even ...

Page 7: ...cause undesired operation Interference Statement NOTE This equipment has been tested and found to comply with both the limits for a Class B digital device and an intentional radiator pursuant to Part 15 Subpart B C of the FCC Rules This equipment generates uses and radiates radio frequency energy If not installed and used in accordance with the instructions it may cause interference to radio commu...

Page 8: ...roduct is designed only for use with the ANALYST interface cable RS 232 Patent Information Protected under one or more Foreign or US patents Other patents pending All specifications subject to change without prior notice LIFEGUARD and Analyst are registered trademarks of Cochran Consulting Inc Copyright 1999 Cochran Consulting Inc C 1999 Cochran Undersea Technology LIFEGUARD Manual English Imperia...

Page 9: ...to thank Dr Bill Hamilton for working with us and sharing his considerable knowledge in the areas of decompression theory and oxygen toxicity The LIFEGUARD Overview USER ENVIROMENTAL ADAPTATION The LIFEGUARD is designed and intended for use with rebreather devices where a combination of factors drives the need for monitoring oxygen levels PO2 in the breathing mixture Additionally the LIFEGUARD is ...

Page 10: ... to completing the adaptation time the LIFEGUARD will treat this dive as a repetitive dive in its algorithm taking into account the residual nitrogen present due to travel to altitude There are two methods of compensating for altitude Via the Analyst Personal Computer Interface ZONE or SEAMLESS compensation for altitude may be selected In ZONE all altitudes less than 2 000 feet above sea level use...

Page 11: ... its compensation as the diver s ascent rate exceeds 30 feet per minute fpm Intelligent Deep Dive Compensation Research has established that successive dive profiles in a given dive day should be progressively shallower to minimize susceptibility to decompression sickness DCS Avoiding inverted square or sawtooth dive profiles also greatly decreases the risk of DCS symptoms Intelligent Deep dive Co...

Page 12: ...mary method of conveying information to the Diver The information is presented in an easy to read and understand layout The Wrist Unit is supplied with TACLITE the night vision safe red Backlight Two ENERGIZER brand N Cell Size Alkaline battery power the WU The WU will receive information from the LIFEGUARD CTU from approximately 36 inches the actual distance will vary depending on the orientation...

Page 13: ...9 79 EAD 64 X 31 10 15 11m EAD 64 X 103 33 50 44 79 79 Therefore the no decompression time for this example would be derived from an EAD of 15 1 meters 50 4 feet Oxygen Toxicity While oxygen is of course necessary to sustain life its effects at increased ambient pressures can be quite harmful It is generally agreed that oxygen toxicity manifests itself in two forms Of the two Central Nervous Syste...

Page 14: ...the associated maximum limit In addition to this audible warning the WARNING legend will flash on the Wrist Unit WU and the TEMPerature digits will be replaced with the current calculated CNS Oxygen Toxicity percentage This warning status will continue until the calculated toxicity is less than 75 percent Maximum exposure time for a given depth is calculated based on the Partial Pressure of Oxygen...

Page 15: ...1 4 this alarm would be issued since 112 minutes is 75 of 149 minutes At a PO2 of 1 5 this alarm would be issued at 82 minutes etc NOTE While all other audible alarms of the dive computer consist of five long beeps the toxicity audible alarm consists of short double beeps that sound for five seconds Pulmonary Whole Body Oxygen Toxicity Another key function to recognize when breathing mixtures with...

Page 16: ... well as between dive recovery time this clock may run for several weeks The clock resets to 0 00 when the OTU level has dropped to 0 Symptoms of Pulmonary O2 Toxicity include burning in the throat and chest coughing and shortness of breath Should any of these symptoms be experienced discontinue diving immediately and consult a Doctor NOTE While most other audible alarms of the dive computer consi...

Page 17: ...the rebreather to prevent snagging and impact with objects which could damage it The object is to secure the bulkhead fitting to the outer case with the wires and Molex connector passing through into the counterlung where the Molex plug attaches to the O2 Sensor with the moisture barrier cap boot pressed down over the back of the sensor Bulkhead Mounting Kit Parts List 1 bulkhead connector assembl...

Page 18: ...e completely off gassed on repetitive dives After a dive the LifeguardTM CTU will remain on for 40 minutes before automatically enter a sleep mode to conserve battery life During this sleep mode all off gassing calculations continue to run but the CTU does not transmit this data To view current surface interval time to fly and other data re activate the CTU just as would be done when first turning...

Page 19: ...l immediately display the current diving data being calculated by your TU During the dive it is not possible to turn the WU off Once back on the surface you can manually turn the WU off This is recommended as a battery saving measure since all calculations are being performed by the TU To turn the WU off on the surface continuously tap the WU in the same manner as that used to activate the unit un...

Page 20: ...ff Some of the reasons are 1 Altitude over 15 000 feet 2 Battery voltage too low 3 Internal diagnostic fault Upon completion the LIFEGUARD enters 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 1 An illustration of the WU screen 2 The LEGEND displayed 3 The M...

Page 21: ...mber time to FLY TEMPerature SURFace time PO2 times 100 and MAXimum DEPTH of the last dive The Alternate Screen shows the last dive s BOTTOM time and O2 percent then reverts to Main Display mode after 3 seconds The following sample displays are of Surface Mode Fig 2 Primary Screen With Residual Nitrogen DIVE of the day number 2 2nd dive of day current time to Fly 15 hours present air TEMPerature 7...

Page 22: ... The LIFEGUARD calculates the PreDive Prediction times based on either the PO2 or FO2 of the gas in the loop Whether PO2 or FO2 is used in the predictions is selected via the ANALYST If FO2 is selected the fractional percentage of oxygen in the breathing gas in the loop will be used only for PreDive Prediction The no decompression NDC times that are computed during a dive are calculated on the PO2...

Page 23: ...ive Prediction Mode continued Fig 4 Primary Screen REMAINing TIME NDC 2 09 2 hrs 9 min TANK indicting system PO2 times 100 37 ata Or in FO2 mode TANK indicting system FO2 in percent 37 predicted DEPTH 60 feet ...

Page 24: ...ntral Nervous System CNS Toxicity and Oxygen Tolerance Unit OTU Toxicity levels These values are shown as percentages This screen will be displayed for three seconds There is only a Primary Screen for this mode Fig 5 Primary Display REMAINing TIME NDC 2 00 Indicates CNS OTU TANK indicating CNS toxicity percentage 27 DEPTH indicating OTU toxicity percentage 8 ...

Page 25: ...tude of 2000 feet above sea level After this 3 second display the unit returns to Surface Mode There is only a Main Display for Predive Information Battery Altitude mode Fig 10 Primary Screen REMAINing TIME NDC 0 00 indicates Battery Altitude TANK indicting Altitude value 2000 feet above sea level DEPTH indicting Battery voltage 5 8 volts WARNING While the LIFEGUARD will automatically adjust its n...

Page 26: ...oxicity values as explained later in this manual All programming sequences use the same routine of pressing the SELECT button to bring up the desired programming element and the INCREMENT button to change the values within the selected element It is necessary to hold the button down for approximately 1 second to cause the selected value to change You may also hold the buttons down for continuous s...

Page 27: ...ctivates When the WU powers up it will go through a self diagnostic display with all segments and legends coming on briefly followed by the WU serial number across the bottom of the screen This serial number appears as a single digit followed by a space and four more digits 4 Attach the Field Programmer to the CTU by snapping the probe into the three clips on the back of the CTU The cable of the F...

Page 28: ...1s place A 3 Depth Alarm 100s place A 2 Depth Alarm 10s place A 1 Depth Alarm 1s place P 3 2 3 O2 Calibration See Calibration Mode section next P 2 2 3 O2 Calibration P 1 2 3 O2 Calibration 1 NOTE The Computer will accept input values up to 99 for the Added Conservatism function but the highest value actually used is 50 Any number greater than 50 will be treated as 50 2 NOTE The P functions are no...

Page 29: ...onservatism Programming the 10 s digit of added Conservatism OTU exposure calculated at 6 CNS exposure calculated at 12 Fig 19 Field Programming Setting Depth Alarm Programming the 100 s digit of Depth Alarm OTU exposure calculated at 6 CNS exposure calculated at 12 ...

Page 30: ... source of pure 100 O2 at hand for use in Step 6 below 3 Expose the sensor to atmospheric air 21 and allow its readings to stabilize see Figure 20a Fig 20a Calibration Mode Sensor exposed to 21 AIR 4 Attach the Field Programmer probe to the CTU and verify the WU display changes to show C 2 in the upper left corner see figure 18 page 29 to indicate start of PROGRAMMING CALIBRATION Mode If not tap t...

Page 31: ...nute or so may be necessary for the reading to stabilize It is not unusual for the readout to go past 100 or stop slightly short of that reading when it stabilizes This confirms that the calibration was necessary NOTE This reading must stabilize prior to proceeding to the next step Fig 20b Calibration Mode Sensor stabilized with 100 Oxygen 8 When 15 seconds have passed with no change in the readou...

Page 32: ... decrease until it reaches 21 confirming that it is now properly calibrated If this reading is not 21 1 re initiate the Calibration sequence and follow steps 2 9 NOTE All program settings are locked in when the INCREMENT button is pressed in Step 9 If it is necessary to change any of these settings re enter Programming and proceed as outlined in the instructions for that mode ...

Page 33: ... The Primary screen shows the REMAINing TIME for NDC ASCENT rate CEILING if required BOTTOM time for this dive current PO2 and current DEPTH The Alternate screen shows REMAINing TIME NDC as a system check TEMPerature BP current O2 and MAXimum DEPTH of this dive When accessed the Alternate screen is seen for three seconds Fig 9 Primary Screen REMAINing TIME by NDC 0 22 22 minutes Current ASCENT rat...

Page 34: ...34 Surface Mode continued Fig 10 Alternate Screen REMAINing TIME NDC indicating System check 9 59 confirmation Current TEMPerature 75 deg F BP indicating current O2 37 MAXimum DEPTH 87 feet ...

Page 35: ...ARNING legend will illuminate when a ceiling of 70 feet is calculated In the case of a ceiling greater than 90 feet the computer will issue a five chirp audible warning once per minute to alert the diver to this situation this alarm will continue until the calculated ceiling is less than 90 feet WARNING You should IMMEDIATELY begin your ascent to the proper CEILing depth upon hearing these warning...

Page 36: ... time for each second spent above the CEILing CAUTION Ascending above the CEILing depth will cause your LIFEGUARD to issue a warning chirp The current depth digits and the WARNING legend will flash Both the audible alarm and the flashing display will continue until you descend below the CEILing depth Your BOTTOM time TANK PO2 ASCENT rate and DEPTH gauge will continue to operate normally as if you ...

Page 37: ...TTOM time 1 56 1 hr 56 min TANK indicating current PO2 1 09 ata current DEPTH 25 feet This value is dependent upon how the dive computer is configured If BOTH is selected this value alternates between total decompression obligation the greater time and stop time the lesser time At a 10 foot stop Total and Stop times may be the same and therefore appear not to alternate See section regarding REMAIN...

Page 38: ...38 Emergency Decompression Mode continued Fig 13 Alternate Screen REMAINing TIME NDC indicating System check 9 59 current water temperature 68 deg F BP indicating O2 62 MAXimum DEPTH 122 feet ...

Page 39: ...r 5 minutes if this violation is not corrected the LIFEGUARD enters Gauge Mode Exceeding a 90 foot Ceiling Stop If the LIFEGUARD calculates a Ceiling of greater than 60 feet it will immediately issue its 5 second chirp alarm If a ceiling stop greater than 90 feet is calculated the LIFEGUARD will issue five audible warning chirps and immediately enters Gauge Mode Exceeding the Maximum Functional Op...

Page 40: ...ration CNS OTU Toxicity Warning Display The LIFEGUARD 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 long beeps the CNS OTU and PO2 have a distinctive audibl...

Page 41: ...100 OXYGEN TOLERANCE UNITS OTU An issue with long term breathing of higher partial pressures of Oxygen above 0 5 ATA is Pulmonary Oxygen Toxicity or sometimes called WHOLE BODY which must be tracked properly The LIFEGUARD will track the OTUs 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 The time de...

Page 42: ...rom Surface Mode To view key data from previously stored dives tap the PWR actuator area on the CTU one time Data from the most recent stored dive will appear on the screen Each successive tap on the PWR actuator will bring up the next preceding stored dive in reverse chronological order Wait for the new data to be displayed on the WU each time before tapping again to go to the next prior dive Acc...

Page 43: ...e 31 40 feet minute average water TEMPerature of the dive 63 deg F BOTTOM time of the dive 1 46 1 hour 46 minutes TANK indicting PO2 1 41 ata MAXimum DEPTH of the dive 63 feet Fig 8 Alternate Screen minimum REMAINing TIME by NDC 0 23 23 minutes maximum CEILing required 0 feet BP indicting average O2 36 Average DEPTH of the dive 43 feet ...

Page 44: ...m 20 to 60 feet per minute in one foot increments Another Analyst selection pertains to the bar graph itself The two selections given are either FIXED or PROPORTIONAL With FIXED each of the five bars indicates an additional 10 feet per minute of Ascent Rate regardless of the maximum Ascent Rate selected With PROPORTIONAL each of the five bars indicate 20 one fifth of the selected maximum Ascent Ra...

Page 45: ... considered as a continuation of the pervious dive In this case bottom time will NOT include the time spent on the surface in this Post Dive Interval Mode However when reviewing the profile with the Analyst the time spent on the surface in this mode will be shown After the Post Dive interval has expired the information on the dive is stored in the LIFEGUARD s electronics The LIFEGUARD will not com...

Page 46: ...ing 4 second period For purposes of explanation references in this manual to ascent rate are with the understanding that this is a 4 second averaged ascent rate and not an instantaneous rate You can select between a Fixed and Variable Ascent Rate with the optional Analyst Personal Computer Interface FIXED ASCENT RATE In the fixed mode the ascent rate will be fixed throughout the entire dive profil...

Page 47: ...esent an additional ascent rate of 6 feet per minute 6 is 20 of 30 This option is especially useful if a variable ascent rate is selected Regardless of the depth and associated maximum ascent rate 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 the battery in either t...

Page 48: ...e CEILing would display the deepest stop that was required Depth Battery Altitude Display On this display the number under the DEPTH legend will indicate the CTU s current battery voltage as a factor of ten For example if the CTU s battery voltage were a 5 8 volts the two digits under the DEPTH legend would display 58 If the battery voltage were a 5 3 volts the two digits under the DEPTH legend wo...

Page 49: ...urn to normal levels For this reason you may have more than one dive day within a single 24 hour period or a dive day may last for more than 24 hours Max Depth Surface Mode The maximum depth reached on the dive just concluded would be displayed up to the maximum gauge depth of 327 feet Subsurface Mode This is the maximum depth recorded during the dive Logbook Mode The maximum depth recorded on the...

Page 50: ...individual stop or Alternating between total and stop time If the alternating option is selected each time is displayed for three seconds Logbook Mode If you are viewing a Decompression dive the total required decompression time would be displayed followed by the DEC legend Surface Time Surface Mode or Gauge Mode Surface time is displayed in hours and minutes from the time the CTU is turned on or ...

Page 51: ... to recognize the audible and visual warnings that your dive computer may issue to alert you of potentially hazardous conditions User Defined Maximum Depth Via Field Programming you have the ability to define a maximum depth to which you wish to dive The depth may be set from 0 to 320 feet in 1 foot increments Refer to the Field Programming section of this manual You may also set this depth via th...

Page 52: ... will illuminate When the CTU s batteries become low the BATT legend on the WU will flash and the CTU will issue a one time five chirp audible warning The batteries should be replaced as soon as possible after the low battery indicator appears NOTE Properly replacing the batteries from the CTU will not cause your dive computer to lose current nitrogen absorption and elimination data for the most r...

Page 53: ...l Nervous System CNS Oxygen Toxicity Warning Should you reach 75 percent of the associated maximum limit your dive computer will issue a one time audible warning consisting of short double beeps that sound for five seconds The WARNING legend will appear and flash and the TEMPerature digits will be replaced with the current calculated CNS Oxygen Toxicity percentage This visual warning will continue...

Page 54: ...54 USERS NOTES ...

Page 55: ...m data storage Removing the main batteries or leaving fully discharged batteries in the CTU will cause this coin cell to gradually lose its power Also the time stamp clock does not operate when the main batteries are removed Q Is this coin cell replaceable A The coin cell can only be replaced by Cochran Undersea Technology since it requires the opening of the CTU By keeping charged batteries in th...

Page 56: ...the electronics If you have flooded the battery compartments first rinse the compartments as soon as possible with fresh water Then fill each compartment with alcohol and shake the alcohol to ensure complete rinsing Drain the alcohol and allow the compartment to air dry 12 hours with the battery caps off Discard the batteries Finally examine the battery cap replace and lubricate the O rings instal...

Page 57: ...whichever should occur first Rinse both units with fresh water and allow them to air dry after each use Take special care when rinsing the opening on the CTU that is between the battery caps NEVER attempt to clean this area with a pointed object or with blasts of compressed air or high pressure water Doing so will cause severe damage to your CTU rendering it inoperable and voiding the Warranty Avo...

Page 58: ...f battery prior to installation Length of time batteries have been installed Frequency and cumulative number of WARNINGS issued by the computer Temperature of the battery in operation Fresh ENERGIZER brand batteries installed in the CTU will read about 6 volts At 5 4 volts the low battery indicator is shown on the WU At 4 8 volts your CTU will not turn on Battery life in the WU will be affected by...

Page 59: ...plying a thin film of silicone grease to the battery terminals will greatly minimize this corrosion from forming NOTE It is always advisable to replace older or questionable CTU batteries with new fresh batteries before a long series of dives especially if your dive computer has been inactive for an extended time NOTE Remember your CTU cannot be manually turned off and since the CTU computes all o...

Page 60: ...4 600 meters Seamless Dive Number 0 9 dives 1 Dive Depth 0 327 feet 1 Foot 0 99 9 meters 0 1 meter Temperature 0 99 deg F 1 degree 0 37 deg C 1 degree Surface Time 0 17 hours 03 minutes 1 minute Maximum Depth 0 327 feet 1 foot 0 99 9 meters 0 1 meter High PO2 Alarm 50 1 6 ATA Low PO2 Alarm 20 40 ATA OPERATIONAL Altitude 15 000 feet 4 600 meters Depth Max Depth 327 feet 99 9 meters Depth Gauge Rang...

Page 61: ...44 6286 or E mail details to service divecochran com Most problems can be resolved without returning the unit The unit may also be returned to the place of purchase and request the dealer to contact us If this is not possible or is inconvenient due to a change in location contact us for the name of the nearest Team Cochran Authorized Dealer NEVER TEST OR SUBJECT THE PRODUCT TO PRESSURIZED AIR NEVE...

Page 62: ...rface Is a complete hardware software systems that uploads data from the LIFEGUARD dive computer to an IBM or compatible Personal Computer with a Windows 95 98 NT operating system The Analyst Personal Computer Interface allows the diver to retrieve dive data customize the dive computer and to also enter and store additional information for each dive in a logbook database To install your ANALYST fo...

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