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Cochran Lifeguard 04-150i User Manual

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LIFEGUARD™
PO
MONITOR
2
User Manual
English Language - Imperial Units
Version 150i
USER INFORMATION
For your records, please fill in the following information.
SERIAL NUMBER OF UNIT:_____________________________
DATE OF PURCHASE: ________________________________
PLACE OF PURCHASE: ________________________________
ADDRESS: ___________________________________________
CITY: _______________________________________________
STATE: __________________________ZIP CODE: __________
________
PHONE NUMBER: ___________________________
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Summary of Contents for Cochran Lifeguard 04-150i

  • Page 1 LIFEGUARD™ MONITOR User Manual English Language - Imperial Units Version 150i USER INFORMATION For your records, please fill in the following information. SERIAL NUMBER OF UNIT:_____________________________ DATE OF PURCHASE: ________________________________ PLACE OF PURCHASE: ________________________________ ADDRESS: ___________________________________________ CITY: _______________________________________________ STATE: __________________________ZIP CODE: __________ ________ PHONE NUMBER: ___________________________...

  • Page 2: Table Of Contents

    TABLE OF CONTENTS Table of Contents Figures Index Limited Warranty and Liability Statement Product Certifications Patient Information Introduction Overview User & Environmental Adaptation Altitude Acclimatization Water Temperature Compensation Microbubble Compensation Intelligent Deep-Dive Compensation Salt Water/Fresh Water (High/Low Conductivity) Theory of Operation Equivalent Air Depth Oxygen Toxicity Pulmonary Oxygen Toxicity...

  • Page 3: Table Of Contents

    TABLE OF CONTENTS (continued) BATT Bottom Ceiling Depth Dive Max Depth Metric Remain Time NDC Remain Time DEC Surface Time Tank Temp Time-To-Fly Audible & Visual Warnings Maximum Depth Two-Minute Entering Deco 60 FT Deco Stop Ceiling Violation Low Battery Ascent Rate Gauge Mode Max PO...

  • Page 4: Figures Index

    FIGURES INDEX Figure Page Number Self-Diagnostic Mode Surface Mode, Primary Screen, with Nitrogen Surface Mode, Alternate Screen, with Nitrogen PreDive Prediction Mode, Primary Screen CNS/OTU Toxicity Display Battery/Altitude Display Logbook Mode, Primary Screen Logbook Mode, Alternate Screen Subsurface Mode, Normal Dive, Primary Screen Subsurface Mode, Normal Dive, Alternate Screen 34 Subsurface Mode, Emergency Decompression Dive, Showing STOP Time, Primary Screen...
  • Page 5 Verification of Dealer status at the time of the purchase may be obtained by contacting COCHRAN. This Limited Warranty is not transferable. Warranty Registration card must be sent to COCHRAN within 15 days of purchase in order to validate Limited Warranty.
  • Page 6 COCHRAN and its distributors and retailers will not be held liable for any personal injuries or other damages resulting from its use, even if COCHRAN has been advised of such occurrences or damages.
  • Page 7 No Cochran Undersea Technology dealer, agent, or employee is authorized to make any modification, extension, or addition to this warranty. CAUTION!!! ACCIDENTAL OR INTENTIONAL LOSS OF BATTERY POWER WILL CAUSE ALL PREVIOUS DIVE NITROGEN LOADING TO BE LOST. THIS MAY AFFECT NITROGEN CALCULATIONS ON NEAR-FUTURE DIVES.

  • Page 8: Patient Information

    Modifications Changes or modifications not expressly approved by Cochran Consulting, Inc. could void the user’s authority to operate the equipment. Shielded Cables To maintain compliance with FCC Regulations, this product is designed only for ® use with the ANALYST interface cable (RS-232).

  • Page 9: Introduction

    ) in the breathing mixture. Additionally, the LIFEGUARD™ is one of the new breed of Dive Computers that adapts its algorithm to the user’s diving environment and style as originally pioneered by COCHRAN. All of COCHRAN’s newer dive computers incorporate this capability. The factors used for this ‘Adaptation’...

  • Page 10: Altitude Acclimatization

    theoretical tissue groups are used. You will find that this unit is extremely user friendly and can be customized to your individual diving conditions and practices. Factors that influence the decompression algorithm of your LIFEGUARD™ are detailed as follows. Altitude Acclimatization Driving or flying to a dive site significantly higher in altitude requires special modifications to the "sea level"...

  • Page 11: Water Temperature Compensation

    Diving in a medium different from what the dive computer is calibrated will cause apparent depth errors. Only COCHRAN dive computers, including the LIFEGUARD™, actually determine the type of diving medium and compensate the depth reading accordingly. This is accomplished by measuring the conductivity of the water during a dive.

  • Page 12: Theory Of Operation

    actually high in minerals or contaminants and is correctly compensated as salt water (high conductivity). This commonly occurs in some caves, springs and lakes. THEORY OF OPERATION The LIFEGUARD™ is designed to constantly monitor and display Partial Pressure of Oxygen (PO ) in addition to the conventional dive computer information.

  • Page 13: Equivalent Air Depth

    Sensor The LIFEGUARD™ is supplied with one of two versions of PO Sensors. One version is supplied with a bulkhead connector and sensor. The other version is a "tee" designed to be installed in the inhalation side breathing hose. The "tee" is avaliable in two different diameters.
  • Page 14 these provisions in mind that the following information is presented. The discussion is intended only as a brief overview to the extent necessary for explanation of the LIFEGUARD™ product's functionality. Neither this information nor the product is intended to take the place of extensive training and certification necessary for safe use of rebreathers and enriched air breathing mixtures.

  • Page 15: Pulmonary Oxygen Toxicity

    LEVEL Max Bottom Time (minutes) (Based on CNS Exposure) 1304 Your dive computer calculates CNS or OTU toxicity percentages and it issues a unique, five double-beep audible alarm once per minute should you reach 75 percent of the associated maximum limit. 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.
  • Page 16 REPEX MAXIMUM DAILY OTU CHART Daily Dose Period Total 1400 1860 2100 2300 2520 2660 2800 2970 3100 3300 3600 3900 4200 15 - 30 OTUs are an exponential function of oxygen partial pressure. The time- dependent limit varies with the number of days that the diver continues to dive without full recovery.

  • Page 17: Installation

    Wrist Unit (WU) The Wrist Unit (WU) may be worn on the wrist or attached to the rebreather by its strap or the optional retractor sold by Cochran, as long as it remains within its intended operating range of approximately 3 feet.

  • Page 18: Activation

    Activation The CTU will automatically activate when it senses an Oxygen level at or above the turn-on set point programmed by the user or by using the power activator area (the “PWR” symbol inside the circular, crosshatched imprint on the left side of the case lid).
  • Page 19 WU display is also activated whenever the alternate screen is selected. TACLITE™ will remain illuminated for approximately 10 seconds. Since all diving calculations are made by the TU, it is possible to activate the WU underwater should you mistakenly forget to do so prior to the dive. Once activated, the WU will immediately display the current diving data being calculated by your TU.

  • Page 20: Operating Modes

    OPERATING MODES Self-Diagnostic Mode At turn-on, both the CTU and WU complete self-diagnostic tests before displaying current information. During these tests, all of the legends and digits on the WU illuminate for approximately 5 seconds. During these tests if an error or malfunction is detected, the unit will turn itself back off.

  • Page 21: Surface Mode

    Surface Mode At the completion of Self-Diagnostic Mode (about 10 seconds), the LIFEGUARD™ enters Surface Mode. The Surface Mode has two screens; a Primary Screen and an Alternate Screen. You may switch to the Alternate Screen by rotating the wrist quickly or tapping firmly on the face of the WU. The Primary Screen shows: DIVE number, time-to-FLY, TEMPerature, SURFace time, PO (times 100), and MAXimum DEPTH (of the last dive).

  • Page 22: Predive Prediction Mode

    Surface Mode (continued) Fig-3 Alternate Screen, with residual Nitrogen • BOTTOM time of last dive 1:26 (1 hr. 26 min) • BP indicating percent O in current mix .51 (51%) PreDive Prediction Mode After 1 minute of Surface Mode, the LIFEGUARD™ enters its PreDive Prediction Mode.
  • Page 23 Predive Prediction Mode (continued) Fig-4 Primary Screen • REMAINing TIME NDC 2:09 (2 hrs. 9 min.) • TANK indicting system PO times 100 .37 ata • Or in FO mode • TANK indicting system FO in percent 37 % • predicted DEPTH 60 (feet)

  • Page 24: Cns/Otu Toxicity Screen Display

    CNS/OTU Toxicity Display At the conclusion of each Predive Prediction Mode cycle, the LIFEGUARD™ enters Predive Information Mode, and first displays current Central 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.

  • Page 25: Battery/Altitude Screen Display

    Battery/Altitude Display At the conclusion of the CNS/OTU Toxicity display, current CTU battery voltage and altitude are shown for 3 seconds. The two digits under the DEPTH legend indicate the current CTU battery voltage as a factor of 10. For example, if the CTU's battery voltage were 5.8 volts, the two digits under the DEPTH legend would read 58.

  • Page 26: Programming Mode

    Programming Mode By using the Field Programmer the following functions may be programmed directly into the LIFEGUARD™ with out the necessity of a P.C. • Added Conservatism factor • Depth Alarm preset • O2 Calibration NOTE: It is essential that the LIFEGUARD™ be calibrated before its first use and prior to the beginning of each diving day.
  • Page 27 Programming Mode (continued) Turn the CTU on. This is done either by exposing the sensing unit to a higher concentration of O2 or by using the power activator area (the “PWR” symbol inside the circular, crosshatched imprint on the left side of the case lid).
  • Page 28 Programming Mode (continued) Use the SELECT and INCREMENT buttons on the Field Programmer to change any desired functions, referring to the following chart. Once all desired changes have been made, hold the SELECT button down to scroll through the remaining Programming functions and lock in the changes made.
  • Page 29 Programming Mode (continued) Fig-18 Field Programming (Setting Conservatism) • 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 •...

  • Page 30: Calibration Mode

    Calibration Mode CAUTION: TO CALIBRATE THE LIFEGUARD™ YOU MUST USE 100% OXYGEN. The LIFEGUARD™ uses a two-point calibration. The First point is and must be 21% while the Second point is and must be 100 %. Calibrate the LIFEGUARD™ as follows: Attach sensor and cable to your LIFEGUARD™.
  • Page 31 Calibration Mode (continued) • • P-3 STOP HERE. Expose the sensor to 100% O (this must be 100%). This can be accomplished by placing the sensor in a plastic bag and flowing O into the bag (make sure not to seal the bag so as to produce pressure build up which would cause a false reading) or using a continuous flow device.
  • Page 32 Calibration Mode (continued) Fig-20c Calibration Mode (Unit Calibrated and showing 100%) 10. Remove the sensor from the 100% O and expose it to normal (21% O ) air. The reading should decrease until it reaches 21, confirming that it is now properly calibrated.

  • Page 33: Subsurface Mode

    Subsurface Mode Whether in the Surface Mode, PreDive Prediction Mode, Field Programming Mode, or the Logbook Mode, the LIFEGUARD™ will automatically enter the Subsurface Mode when the unit senses a depth greater than 5 feet and is exited when the unit senses a depth less than three 3 feet. The Subsurface Mode has a Primary and an Alternate screen.
  • Page 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: Emergency Decompression Mode

    Cochran Undersea Technology in no way encourages deliberate decompression diving. Should you exceed your NDC time limit, your LIFEGUARD™ will enter Decompression Mode.
  • Page 36 Emergency Decompression Mode (continued) NOTE: When completing decompression stops, minor changes in your depth may occur due to swells at the surface. For this reason, it is recommended that you make your stop slightly deeper than the CEILing depth. The LIFEGUARD™ will continue to give decompression credit when this precaution is taken.
  • Page 37 Emergency Decompression Mode (continued) Fig-12 Primary Screen, Showing Total Decompression Time • REMAINing TIME DECompression total* 0:15 (15 minutes) • current ASCENT rate less than 10 fpm • depth of current CEILing 20 feet • current BOTTOM time 1:56 (1 hr. 56 min.) •...
  • Page 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 O 62 % • MAXimum DEPTH 122 feet...

  • Page 39: Gauge Mode

    Gauge Mode Violating certain conditions will cause the LIFEGUARD™ to stop calculating nitrogen absorption/elimination and cease providing remaining time information. When this occurs, your LIFEGUARD™ has entered its Gauge Mode. Once in this mode, 24 hours of surface time MUST elapse without a dive being made before the system will resume its normal operation.
  • Page 40 Gauge Mode (continued) Fig-14 Primary Screen • current water TEMPerature 55 degrees F • current ASCENT rate 31-40 feet per minute • current BOTTOM time* 3:36 ( 3 hrs 36 mins) • current SURFace time* • TANK indicating current PO 1.00 ata •...
  • Page 41 CNS / OTU Toxicity Warning Display (continued) PARTIAL PRESSURE OF OXYGEN (PO ): High levels of PO can cause severe Oxygen poisoning. Widely different levels of PO can affect individual divers. ® The user via the Analyst can set the PO alarm to any level between 0.50 ATA and 1.60 ATA.

  • Page 42: Logbook Mode

    CNS / OTU Toxicity Warning Display (continued) Whatever the current CNS/OTU Toxicity level, it can also be viewed during the PreDive Prediction scrolling or in the Field Programming Mode (see figure 18, page 29) • WARNING immediate attention required (Flashing) •...
  • Page 43 Logbook Mode (continued) Fig-7 Primary Screen • DIVE of the day number 2 (2nd dive) • time to FLY 15 hours • maximum ASCENT rate during the dive 31-40 feet / minute* • average water TEMPerature of the dive 63 deg. F •...

  • Page 44: Ascent Rate Bar Graph

    ASCENT RATE BAR GRAPH The Ascent Rate bar graph and alarms are active in both the Subsurface Mode and Decompression Mode when the depth is below ten feet. The five-segment bar graph is used to display the diver's rate of ascent. The factory default for maximum ascent rate is 60 feet per minute.

  • Page 45: Post-Dive Interval

    ® using the Analyst P.C. Interface. See an Authorized Team Cochran Dealer for a complete demonstration. Some available features are described in the section “USER CONFIGURABLE OPTIONS”. NOTE: Regardless of the Ascent Rate Bar Graph's settings the Ascent Rate...

  • Page 46: Explanation

    EXPLANATIONS Altitude Diving The LIFEGUARD™ senses the barometric pressure for altitudes up to 15,000 feet above sea level. Barometric pressure at a given altitude can change due to high and low-pressure weather systems as well as temperature. When compared with most analog gauges at altitude, the LIFEGUARD™ will display a greater depth.

  • Page 47: Ascent Rate Bar Graph

    NOTE: Ascent rate is only computed and displayed at depths greater than 10 feet. Ascent Rate Bar Graph The Ascent Rate Bar Graph is comprised of a vertical five-segment bar. With the optional Analyst Personal Computer Interface, you can select this bar graph to either represent the speed of your ascent or a percentage of the selected maximum ascent rate.

  • Page 48: Ceiling

    Logbook Mode: The bottom time for the profile viewed is displayed on the Main display. Gauge Mode or Decompression Mode or Subsurface Mode: Your dive computer begins to count your bottom time when you have descended below approximately five feet. Bottom time continues to be counted until you have ascended above three feet.

  • Page 49: Dive

    Dive Surface Mode: The dive number counts the number of dives made in a single “dive day”. This counter begins with 0 and continues through 9, resetting back to 0 each time the CTU is powered on if no Residual Nitrogen remains in your system.

  • Page 50: Remain Time Dec

    NOTE: If the no-decompression limit for a given depth is less than two minutes, your dive computer will not make a PreDive prediction for that depth. Battery/Altitude Display: The number 0:00 under the REMAIN TIME legend is used to indicate the Battery/Altitude Display. Subsurface Mode: This is the amount of no-decompression time remaining displayed in hours and minutes.

  • Page 51: Time-To-Fly

    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.

  • Page 52: Ceiling Violation

    60 Foot Decompression Stop Warning Should you require a decompression stop greater than 60 feet, the unit will issue a one time five-chirp audible warning. Ceiling Violation When in the Decompression Mode, ascending to a depth shallower than the Ceiling depth will cause your dive computer to: •...

  • Page 53: Max

    Gauge Mode Alarm The dive computer will sound its five-chirp alarm just prior to entering Gauge Mode. It will re-issue this five-chirp alarm if the CTU is powered up within 24 hours after entering Gauge Mode. The computer will enter the Gauge Mode if: •...
  • Page 54 USERS NOTES...

  • Page 55: Questions And Answers

    Is this coin cell replaceable? The coin cell can only be replaced by Cochran Undersea Technology since it requires the opening of the CTU. By keeping charged batteries in the CTU, the life of this coin cell is expected to be over ten years.
  • Page 56 Can I turn the CTU on underwater? No. The CTU will not turn on if you are underwater. Should you enter the water and begin a descent without turning the CTU on, slowly surface, turn the CTU or wait for the O2 sensor to read a higher O You must wait for it to complete its Self-Diagnostic Mode, and then begin your descent once again.

  • Page 57: Care And Maintenance

    Minor scratches will become invisible underwater. However, severe gouges or cracks in the lens would require that it be replaced. The installation of the optional WU lens protector available through your Cochran Dealer will prevent this type of WU lens damage.

  • Page 58: O 2 Sensor Care

    % of O . For maximum life and to avoid voiding your warranty use only sensors sold by Cochran. Battery Type and Replacement Your dive computer operates on two different sizes of user-replaceable batteries.

  • Page 59: Battery Care

    DURING THE PRE-DIVE PREDICTION MODE. DIVE-OF-DAY NUMBER GOING TO ZERO IMMEDIATELY AFTER CHANGING BATTERIES IS ANOTHER INDICATION OF A LOSS OF NITROGEN LOADING. IF LOSS OF NITROGEN LOADING OCCURS, COCHRAN STRONGLY RECOMMENDS THAT A PERIOD OF 24 HOURS ELAPSES BEFORE MAKING ANY SUBSEQUENT DIVES.

  • Page 60: Technical Specifications

    TECHNICAL SPECIFICATIONS (Subject to change without notice) No-Decompression Model Algorithm: Modified Haldanean Number of Half Time Compartments: Decompression Ceilings Ceiling Depths: 10, 20, 30, 40, 50, 60, 70, 80, 90 feet 3, 6, 9, 12, 15, 18, 21, 23, 27 meters Altitude Diving Model Procedure: Altitude adjust is seamless from sea level to 15,000 feet (4600 meters) above sea level.

  • Page 61: Product Assistance & Maintenance

    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. •...

  • Page 62: Replacement Parts

    REPLACEMENT PARTS Tank Unit Battery Cap O-ring 19915 Tank Unit Battery Caps w/O-rings 19911 Wrist Unit Battery Cap O-ring 19930 Wrist Unit Battery Cap w/O-rings 19934 Mounting Clips, TU, Pkg. of Three 19914 Strap, Replacement Set, Gray 19950 Pins (2), replacement 19949 Wrist Unit Lens Protector 15401...

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Lifeguard 150i

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