Cochran COMMANDER, COMMANDER EMC-20H Owner's Manual

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Cochran

COMMANDER

Owner's Manual

English - Imperial

Ver: CmdrAir-1.02

Manual Part Number: 4100811

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Serial Number: _________________________ Your Name: ____________________________ Your Contact: __________________________ ______________________________________ ______________________________________ Purchase Date: _________________________ Purchase Place: ________________________ Address: ______________________________ ______________________________________ ______________________________________

PRODUCT INTRODUCTION:

The COMMANDE R is quite simple to use and operate, but underneath that simplicity lies a significant l evel of sophistication. To get the safest and most effective use of this instrument, it is important that the user fully understand the product. Please read and understand this entire manual and know the principles and practices of safe diving before using t his device.

This Manual is divided into the following Sections:

Section Page

• Operation as an Air-only Dive Computer 1

• Alarm Clock Operation 10

• Touch Programming 13

• Warnings 19

• Configurable Items 22

• Specifications and Maintenance 26

• Liability, and Warranty 31

• Itemized Index and Subjects 38

SIDE CONTACTS:

CONTACT #2

CONTACT #1

CONTACT #3

The Contacts are used to let the user command the unit to do a number of functions, communicate with a PC for extracting information or configuring the unit, and determining water conductivity. When Contacts 1 & 2 are shorted, the COMMANDER can detect the difference between wet fingers, metal objects, fresh water, salt water, and a PC interface probe.

TURNING ON THE COMMANDER:

Although the COMMANDER automatically turns on when it is submerged in water, it is STRONGLY recommended that the unit be manually powered up by wetting two fingers and simultaneously touchi ng Contact s 1 and 2 for two seconds. This allows the diver to ensure that the unit is operating correctly and has adequate battery capacity prior to entry. Once activated, the unit will remain on for 60 minutes. If a dive is not initiated within this 60 minutes, the COMMANDER

automatically shuts off. Notice that when Contacts 1 & 2 are first bridged, a short beep is issued which indicates that the unit is recognizing the touch. Every time Contacts 1 & 2 are bridged with wet fingers, the unit will stay on for one full hour.

The COMMANDER will not turn on if the altitude is higher than 15,000 feet, the batteries are less than 1.6 volts, or a fault is detected during the self-test.

As the COMMANDER first recognizes a turn-on command, it begins a “Diagnostic” function where many aspects of the system will be exercised and tested. This procedure takes about three seconds and an audible beep is issued each second as certain tests are successf ull y com pl eted. During this time, all of the segments in the display are turned on so that their operability can be confirmed by the user. Should a test indicate a malfunction or marginal test, the unit will turn back off again. The user should ensure that all of the display segments are on and operating correctly.

TURNING OFF THE COMMANDER:

After the Post Dive Interval following a dive, the COMMANDER will remain on for one hour before automatically entering its "Sleep Mode". During the Sleep Mode, all calculations continue, but the display is off. This is a power saving feature of the COMMANDER. The unit will continue calculating Surface Interval, compartment off gassing as required, and any changes in altitude as it affects Nitrogen Loadi ng. The current Surface Interval and PreDive Predictions can be viewed by reactivating the unit.

MAIN COMMANDER OPERATING MODES:

• Surface Interval (No Nitrogen Resi dual )

• Surface Interval (With Nitrogen Residual)

• Dive Mode (Normal No Deco)

• Decompression Mode

• Post Dive Interval

• Touch Programming

SURFACE INTERVAL:

After completion of the Self-Diagnost ic mode or aft er the Post Dive Interval following a dive, t he COMMANDER enters the Surface Interval. The Screen displays, if applicable; current Surface Time, the previous dive’s Maximum Depth, the previous dive’s Bottom Time, Dive of Day number, current Time to Fly, Altitude and Temperature. Figure 2 shows the display with no residual Nitrogen (a clean Di ve).

Figure 5 shows the display with residual Nitrogen (a repetitive dive).

“Surface Time” starts at zero after a dive and begins counting minutes. If the computer shuts off and is turned on with Nitrogen residual left, the Surface Time continues to count. If the computer shuts off and is turned on with no Nitrogen residual left, the Surface Time will be zero.

“Dive of Day” starts at zero and increments after each dive regardless of the calendar day. When there is no remaining Nitrogen residual, t he Di ve of Day is set to zero and the computer is referred to as a “clean” system.

“Time to Fly” is displayed as the number of hours remaining until the Nitrogen residual reaches zero plus a twelve-hour safety factor. Flying is not recommended until Time to Fly reaches zero.

“Barometric Altitude” is i ndica t ed in six ranges via the Ascent Rate Bar Graph as follows (Altitude compensation is seamless up to 15,000 feet above sea level):

0 Bars sea level to 2,500 feet 1 Bar 2,500 to 5,000 feet 2 Bars 5,000 to 7,500 feet 3 Bars 7,500 to 10,000 feet 4 Bars 10,000 to 12,500 feet

5 Bars 12,500 to 15,000 feet The six ranges are for display purposes only: The COMMANDER actually senses and computes extremely small altitude changes and hence, is call ed “Seamless”. The term “Barometric Altitude” is used instead of just “Altitude” because the COMMANDER measures Barometric Pressure to determi ne Alti tude. Barometric Altitude can vary from actual Altitude by over +/- 1000 feet! What is important to the body when diving is Barometric Altitude.

DIVE MODE:

Whether in the Surface Interval, PreDive Prediction Mode, Programming Mode or the Logbook Mode, the COMMANDER will automatically enter the Dive Mode whenever the unit determines that it is in water deeper than five feet.

On the Display Screen the Surface time will be replaced with the current Depth and be displayed in one-foot increments. The maximum specified depth is 327 feet, but the unit will continue to measure and display depths deeper that that. A Depth Sensor warning will be issued (See later discussion on

Sensor Warnings) when the unit can no longer accurately measure depth.

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. The Depth Alarm issues an audible alarm and the “WARNING” legend and Depth Digits will flash on and off for five seconds. The depth alarm is disabled if in the Decompression Mode since flashing depth digits have another meaning in this Mode.

The maximum depth achieved on the current dive is shown as “MAX DEPTH”. This is updated once per second.

“REMAIN TIME” (NDC) is the remaining time (in hours and minutes) that the diver can stay at the current depth without requiring decompression. A “Two Minute Warning” will be issued when this time reaches two minutes or less. An audible alarm will be issued and the “WARNING” legend and “REMAIN TIME” digits will flash. By immediately ascending to a shallower depth, the diver may avoid a required decompression stop.

Temperature is measured for two purposes. One is to compensate the Depth Transducer for Temperature variations. The other is to compensate the Nitrogen algorithm for changes in Temperature that may affect the body. Both of these purposes require that the Temperature be very slow reacting, just lik e the Depth Transducer and the body. This slow-reacting Temperature is what is displayed. For Temperature effects on the body, the amount of compensation can be set from NORMAL to REDUCED with the Anal yst

PC software Interface (see Analyst® Section ) , if th e diver is using a good dry-suit in cold water. Temperature compensation starts at 75 degrees F and gets progressively more conservative as the temperature decreases. There is no compensation above 75 degrees F.

Bottom Time will begin once the COMMANDER 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.

ASCENT RATE BAR GRAPH:

The Ascent Rate bar graph and alarms are active in both the Dive Mode and Decompression Mode. The five-segment bar graph is used to display the diver's rate of ascent.

Via the Analyst® PC Interface, the Ascent Rate Alarms and Bar Graph can be set to the users preferences.

The first option is a VARIABLE-BY-DEPTH Ascent Rate. When on, the Ascent Rate Alarm is determined by depth. As the diver ascends to shallow depths, the Maximum Ascent Rate is lowered. The Maximum Ascent Rates and their associated depth are:

60 feet or deeper 60 feet per minute 60 to 30 feet feet per minute equal to the depth Less than 30 feet 30 feet per minute

If VARIABLE-BY-DEPTH is off, the Maximum Ascent Rate Alarm and Bar Graph is specified by the user and can be from 20 to 60 fpm, in one foot increments.

Another selection is the bar graph itself. The two selections 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 Asce nt Rat e.

For FIXED, the maximum ascent rate is 60 feet per minute. With this setting, no bars will illuminate if a diver is ascending at a rate less than 10 feet per minute.

If the diver has an Ascent Rate that exceeds the selected maximum, the entire Ascent Rate Bar Graph will flash, and the audible alarm will sound once per second, and the WARNING legend will illuminate.

The sensitivity or responsiveness of the Ascent Rate may be selected via the Analyst

, eight different levels

of sensitivity are available. NOTE: Customizing the Ascent Rate and Ascent

Rate Bar Graph are among many of the additional programmable features available when using the Analyst

PC Interface. Available features are described in the section “USER CONFIGURABLE OPTIONS”.

As shipped from the factory, the Ascent Rate is set for VARIABLE- B Y- D EPTH AND PROPOR TIONAL.

DECOMPRESSION MODE:

Should a no-decompression limit be overstayed, the COMMANDER 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” legend and two digits. The Ceiling will start at 10 feet and increase in tenfoot increments as the diver remains at a relatively deep depth.

The Remaining No-decompression Time and “NDC” legend will be replaced with Decompression Time and “DEC” legend (Figure 16d). Both STOP time and TOTAL time are displayed in the upper left hand three digits of the screen in hours and minutes. STOP and TOTAL time will alternate at the rate of once every two seconds. In this way, the diver can view the tim e to spend at a particular STOP depth, and the TOTAL time it will take to complete all STOPS. Clearly, the larger of the two alternating numbers is the Total Decompression Time of all stops, and the smaller of the two numbers is the time required at the current stop. At the ten foot stop, the TOTAL and STOP times may be the same and therefore appear to not alternate.

When at a specific stop, the required decompression time at that stop is as shown, and will appear to count down as it is recomputed every second, based on the divers exact current depth. The Decompression times (both Stop and Total) are accurate only if the divers depth is exactly the same as the required Ceiling. However, it is not necessary to be precisely at that specified Ceiling. Appropriate In-gass i ng or Outgassing will be computed regardless of the divers current depth.

A small margin shallower than the Ceiling also exists. Should a Ceiling be ‘violated’ (diver is shallower than Ceiling), the “WARNING” legend will illuminate and flash along with the Depth and Ceiling digits. An Audible alarm will sound once every two seconds. This warning will continue until the Depth has been corrected. Out-gassing will continue even though the diver is shallower than the Ceiling. There is no ‘Gauge’ mode or ‘Lockout’ on the COMMANDER.

If the diver surfaces before satisfying his decompression obligation, th e COMMANDER will continue to give out-gassing credit as if it were in a dive, but at a depth of zero feet and will satisfy the decompression time requirements of the required stops using an FO

of 21%. The unit will continue to log data and perform as if actually in a dive. When the decompression obligation is finally s atisf i ed, the tenminute “Post Dive Interval” will begin.

NOTE:

COCHRAN does not intend for this instrument

to be used for deliberate Decompression diving.

POST DIVE INTERVAL:

During the first ten minutes (or up to thirty minutes

the unit is in the Training Mode) after a dive, the COMMANDER is in the Post Dive Interval. The flashing "SURF" legend and a Surface Time of less than ten minutes (or up to thirty if the unit is in the Training Mode) 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 div e . In this case, Bottom Time will NOT include the time spent on the surface in this Post Dive Interval. However, when reviewing the profi l e with the Analyst

, the time spent on the surface in this period

will be shown.

CONFINED WATER PROTOCOL (Training Mode):

The COMMANDER is one of the first dive computers to offer an operating mode designed to record and store data from training dives. That is, dives performed in shallow water environments (s wimming pools, shallow lakes, lagoons, etc. ) or calm open water environments that have less than 1-foot seas. In the Training Mode, the COMMANDER 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 may be extended, vi a the Analyst

, from 10 minutes up to a maximum of 30 minutes in 1-minute increments after which the dive data is stored in the computer's memory. These changes permit the Instructor to record the complete training session, including i n-water s u rf ace peri ods, as a single dive.

The Training Mode can only be enabled/disabled via the Professional Edition of the Analyst

PC Interface.

TACLITE™:

The COMMANDER is equipped with the TACLITE™ tactical low-light fiber-optic backlight ed display. The standard TACLITE™ color is night vision safe red, but it is also available in yellow for those individuals who have vision diff ic ul ties with the color red. The TACLITE™ can be activated on demand. To turn the TACLITE™ on, tap the face of the COMMANDER and the TACLITE™ will turn on for the preprogrammed number of seconds (1 to 98), then turn off. By tapping the face again the TACLITE™ will turn on again. In this fashion the TACLITE™ can be kept on for as long as wanted. If 0 is entered, the TACLITE™ will never turn on. If 99 is entered, the TACLITE™ will stay on continuously and only turn off when the COMMANDER does. The number of seconds that the TACLITE™ stays on can be set via the Programming Mode or via the Analyst

PC Interface, factory setting is 10 seconds. The TACLITE™ will turn off when the COMMANDER turns

off. If the batteries get too low, the TACLITE™ will turn off and cannot be turned back on until fresh batteries are installed.

CLOCK MODE:

The Clock operating mode of the COMMANDER is NOT enabled when shipped from the factory. It can be enabled via the Analyst

P.C.

Interface or at an Authorized Cochran Dealer.

TOUCH PROGRAMMING MODE

: Can only be accessed when the unit is in the Surface Interval and allows the user to view or program into the dive computer:

• Setting Clock and Alarm Time

• The PreDive Prediction Mode

• Displaying Mode, mode value, & battery vol tage

• A Maximum Depth Alarm

• An Added degree of Conservatism from 0 to 50%

• Programming the On Time for the TACLITE™

• Access the Logbook Mode

TOUCH PROGRAMMING - CLOCK:

When the COMMANDER is placed into the Clock mode it will display the time of day in a 24 hour day format. The clock will continue to run when the COMMANDER is in the Dive Computer Mode. The COMMANDER can be placed into the Clock Mode from the Dive Computer Mode when the unit is in the Normal Surface Interval, while the unit is in Clock Mode the Dive Computer will be in the “Sleep” mode.

The Clock Mode can be selected with or without an Alarm. If the Alarm option is selected the unit will display the alarm set time as well as the current time.

When the alarm time is displayed the alarm is activated and at the programmed time the alarm will sound once every 24 hours. When the alarm is activated the unit will issue a medley of all the audible warning tones that the COMMANDER utilizes and the TACLITE™ will flash for one minute, this audible alarm can not be turned off, it will sound for the full one minute period.

The Clock Mode is selected via Touch Contact Programming.

NOTE: This Time of Day clock is the same clock that is used to time stamp dives. Modifying the Time of Day clock will effect the Local Time as viewed via the Analyst

. The Date portion of the Local Time clock must be changed via the Analyst

CLOCK PROGRAMMING PROCEDURE:

Contacts 1, 2, & 3 are for programming sequences. To begin the programming sequence:

1. Turn the unit on;

2. Using a coin or other conductive metal object, briefly bridge Contacts 1 and 2 until a short beep is heard and the Clock Menu is seen on the display.

3. To enter the Clock submenu, bridge Contacts 1 & 2 with wetted fingers. This will cause the unit to display the Clock Alarm selecti on – On or OFF. To Toggle the selection, bridge contacts 1&2 with wetted fingers.

4. Using a coin or other conductive metal object, bridge Contacts 1 & 2 to access the Clock Time or Alarm setting screen.

5. Shorting Contacts 1 & 2 with a coin will cause the first digit of the minutes to flash.

6. Shorting Contacts 2 & 3 with a coin will increment the numeric value, continue unt il the required value is displayed. A confirmation beep will sound with each increment.

7. Next using wetted finger, bridge Contacts 1 & 2 to select the next digit, once selected the digit will flash to identify that it is being programmed. Bridge Contacts 2 & 3 till the desired value is displayed.

8. To select Hours short Contacts 1 & 2 with a coin, increment as in step 6 and 7.

9. Repeat step 5 through 7 until all digits have been programmed.

10. To save the changes that have been made bridge Contact 1 & 2 with a coin or other conductive metal object. Once the next programming option is displayed the changes have been saved.

To exit the Clock Mode Bridge contacts 1 & 2 with wetted fingers and the computer will return to the Dive Computer Mode’s Surface Display.

NOTE: Ensure that the COMMANDER is in the

Dive Computer Mode before commencing a dive.

Figures 40, 41a, 41b, 42 and 43 show how the Clock display screens appear.

NOTE: Once the COMMANDER is placed in Clock

Mode the unit will remain in that mode unt i l exited by the diver.

TOUCH PROGRAMMING MODE: NOTE: To enable the Programming Mode, the

COMMANDER must be on the Surface and not in the Post Dive Interval.

NOTE: All audible and visual alarms are

suspended while the COMMANDER is in the Pr ogramming M ode. Upon exiting the Programming Mode all alarms are reactivated.

NOTE: Once a value has been changed and the

next menu option selected, the new value is stored.

NOTE: It is strongly recommended that the

Programming Mode is activated again and a complete review of what was stored is accomplished.

NOTE: If the COMMANDER 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. Once this occurs the COMMANDER will retain the modified programmed settings that have been stored. Options that have not been modified will retain their previous settings.

TOUCH PROGRAMMING MODE - PROCEDURE:

Contacts 1, 2, & 3 are for programming sequences. To begin the programming sequence:

1. Turn the unit on;

2. Using a coin or other conductive metal object,

briefly bridge Contacts 1 and 2 until a short beep is heard and the Programming Menu is seen on the display. The Programming Menu options depend on whether the unit is activated for Clock. The Menu options are displayed in sequence, incrementing to the next selection each time that Contacts 1 & 2 are bridged with a

coin

. The program option is displayed on the upper row of the display. The current setting for this option is displayed in the lower right of the display.

3. To reprogram the displayed menu values, bridge Contacts 1 & 2 with wetted fingers. This will cause the current setting to flash or in the case of multi-digit numbers, the least significant digit will flash. The clock will toggle between on and off.

4. Using a coin or other conductive metal object, bridge Contacts 2 & 3 to increment the numeric value. A confirmation beep will sound with each increment.

5. Next using wetted finger, bridge Contacts 1 & 2 to select the next digit, once selected the digit will flash to identify that it is being programmed. Bridge Contacts 2 & 3 till the desired value is displayed.

6. Repeat step 5 until all digits have been programmed.

7. To save the changes that have been made bridge Contact 1 & 2 with a coin or other conductive metal object. Once the next programming option is displayed the changes have been saved.

All programming sequences use the same routine of using Contacts 1 and 2 to SELECT the next programming sequence and Contacts 2 and 3 to INCREMENT the specified value.

PROGRAMMING MOD E MEN U :

The following table lists the various programming choices with their display identific ation and figure number.

Identification Description Figure Page CLC

Clock – if enabled 40 12

PdP

PreDive Prediction 22 14

InF Misc.

Information 23 14

dEP AL

Depth Alarm, Max value

is 320 feet 25 14

Con

Added Conservatism, Max

value is 50%. 26 15

Tac dL

TACLITE™ On Time. Allow e d

value 0 to 99 33 15

LOG

Logbook 34a 15

TOUCH PROGRAMMING - PREDIVE PREDI CTION:

PreDive Prediction is access ed vi a the Touch Contact Programming Menu. This enables the diver to view the PreDive Prediction informati on at the touch of the Contacts. The COMMANDER’s PreDive Prediction starts at 30 feet and increases in 10 feet increments. PreDive Predictions will terminate when the NoDecompression (NDC) time prediction reaches two minutes or a maximum depth of 320 feet is reached. Additional Conservatism, Resi dual Nitrogen and Barometric Altitude can effect PreDive Predictions. Once the maximum PreDive Prediction depth has been reached the unit will return to the Surface Interval.

Refer to the Analyst® for information about how to modify parameters. During the PreDive Prediction Mode, the unit will compute and display the maximum safe time and the calculated PO

value at that depth.

TOUCH PROGRAMMING INFORM ATION DISPLAY:

The Information display is access ed via th e Programming Mode. The information presented will appear as in Figure 24. The information in the upper right of the screen indicates the unit is in the Air Only FO2 Mode.

Identifier Description

F0 Air only

The Battery voltage is displayed in the lower center of the screen as a two-digit number with a decimal point proceeded by a lower case ‘b’. Figure 24 shows what the display screen looks like for a Commander configured for Air Only.

TOUCH PROGRAMMING - DEPTH ALARM:

The Depth Alarm allows the diver to select a maximum depth below which the

diver does not wish to descend before an alarm is issued. This depth can be set from 0 to 320 feet in one foot increments.

TOUCH PROGRAMMING - CONSERV ATISM:

This programming function allows the diver to input an added degree of Conservatism into the Commander’s nitrogen algorithm. Via Touch Programming the Conservatism can be set from 0 to 50%.

TOUCH PROGRAMMING - TACLITE™:

The Taclite™ dwell (on) time can be set so that when the face on the COMMANDER is tapped the Taclite™ will stay on from 1 to 98 seconds. If the dwell time is programmed to ‘0’ the Taclite™ will never come on, if programmed to 99 the Taclite™ will be on whenever the COMMANDER is awake.

TOUCH PROGRAMMING - LOGBOOK:

The Logbook of the COMMANDER has two screens, a Primary Screen and an Alternate Screen. To switch to the Alternate Screen just tap firmly on the face of the unit. The Logbook is accessed via the Touch Contact Programming (see page 13). This enables the diver to view dive statistics; the COMMANDER has the ability to provide diving data for the most recent 512 dives. The most recent dive will be displayed first. To view the next dive, touch the contacts 1 & 2 with wetted finger after pausing for a few seconds. Do not use a metal object such as a coin or knife-blade once in the Logbook since it will

cause the unit to exit the Logbook and return to the Surface Interval.

Information contained in the Logbook will include: Overall Dive Number Minimum NDC Time

Fastest Rate of Ascent Minimum Water Temperature Bottom Time Surface Inter val Before Div e Maximum Depth Ending Battery Voltage Beginning Dive Time & Date Maximum DEC Time (Deco Dive) Maximum Ceiling (Deco Dive)

It is not necessary to exit the Logbook Mode prior to initiating a dive. Once the diver has descended below five feet, the COMMANDER will immediately enter the Dive Mode.

NOTE: The overall Dive Number that is displayed on the Logbook Menu screen (Figure 34) permits the diver to identify the total number of dives made with that COMMANDER. If the logbook example shown is the most recent dive made, it can be readily identified that 235 dives have been made with this specific unit.

Figure 34b shows that dive 235 started at 14:26 hours or 2:46 pm on the 18

of December 2001.

Figures 35 & 37b display the Logbook of a Normal Dive.

Figures 36 & 38b display a Deco Dive.

WARNING INDICATIONS:

Failure to observe audible and/or visual warnings and take corrective action m ay result in injury or death. In general, if the WARNING legend is flashing, some other digits should be flashing to indicate the anomaly.

• If the diver is ascending faster than the selected

maximum ascent rate, then the top bar of the ascent bar graph will flash and the “WARNING” legend will illuminate. The unique high to low audible sweep alarm will continue to sound once per second until the situation is corrected.

• If the diver descends below the user set Depth

Alarm, the Depth digits will flash. A single beep audible alarm will sound once per second for five seconds and will repeat every two minutes. The Depth alarm is not active in the Decompression Mode to avoid confusion with the “Shallower Than Ceiling” alarm.

• If the battery voltage declines to 2. 1 volts, th e

“BATT” legend will illuminate, at 1.8 volts it will flash once per second.

• If the diver has less than two minutes of No-

Decompression Time (NDC) rem aining, the “WARNING” legend will illuminate and flash along with the Remaining NDC time digits. A single beep audible alarm will sound once per second for five seconds and repeat every two minutes.

• If the diver enters the Decompression Mode, a

single beep audible alarm will sound once per second for five seconds.

• During a Decompression dive, if the Depth is

less than the CEILING, the “WARNING” legend will illuminate and flash along with the Depth and Ceiling digits. A unique low to high audible sweep alarm will continue to sound once every two seconds until the situation is corrected.

• If the dive computer determines that either the

Depth or Temperature sensor is malfunctioning. The “WARNING” legend will illuminate, the computer will issue a 5-beep two tone audible alarm once every two minute to alert the diver to this condition. On the Appropriate Screen the Maximum Depth will be replaced with “S-d“ or "S-

-" to indicate the low-pressure transducer or “S-t” for the temperature transducer.

If an audible alarm is being issued, the computer will not switch to the Alternate display nor will the TACLITE™ activate.

SENSOR WARNING:

The COMMANDER has the capability of monitoring the integrity of its' sensors, both the low-pressure (depth/altitude) and the temperature. When the computer detects an error in one of the transducers, the diver is alerted to this condition by the illumination of the “WARNING” legend, and the computer will also issue a 5-beep two tone audible alarm once every two minute to alert the diver to this condition. The Maximum Depth will be replaced with “S-d“ or "S--" to indicate the lowpressure transducer or “S-t” for the temperature transducer (see figure 18). The “WARNING” legend, along with either the Temperature digits or the Depth digits and the error code will flash once per second. In the highly unlikely situation were both sens ors are detected as having errors, the display will alternate between “S-d“ or "S--" and “S-t”. This warning will be issued whether the computer is in the Surface Interval, Dive Mode, Decompression Mode or P ost Dive Interval. In the unlikely c ase that your c omputer issues one of these warnings the unit should be returned to the factory for evaluation and/or repai r. Figure 18 shows a Sensor Warning, in this case a Depth Sensor, as it would be displayed in the Dive Mode. If the Sensor Warning was for the temperature sensor it would display “S-t“.

DATA STORAGE TYPES & CAPACITY:

The COMMANDER has the following internal distinct dat a storage activities t hat can be recall ed, viewed, and stored with the Analyst

PC computer interface:

•

Current Variable Information:

Local Time, Altitude, Battery voltage, Current unit Temperature, and 16 tissue loading.

•

Current Configuration Data:

As can be seen in

“USER CONFIGURABLE ITEMS”, below.

•

Historical Totals Summaries:

Dive Time, Number of Dives, Number of Marginal Dives, Number of Violated Dives, Number of Warnings, Decompression Dives, Dec ompression Time, Maximum Depth and Ceiling, Maximum Depth and Ceiling Dive Number.

•

Each Dive Beginning Statistics:

16 tissue loading, Local Time Clock, Dive of Day, Dive Number, Surface Time, Altitude, Time to Fly, and Battery Voltage. Capacity is the most recent 512 dives.

•

Each Dive Ending Statistics:

16 tissue loading, Bottom Time, Max Depth, Average Depth, Min NDC Time, Max Deco Time, Max Deco Ceiling, Missed Ceiling, Missed Deco Time, Max A scent Rate, Ma x A /R Time, Max A/R Depth, Min Temperature, Average Temperature, Maximum Temperature, Min Battery Voltage, Time to Fly, and number of Warnings. Capacity is the most recent 512 dives.

•

Each Dive Configuration Data:

Full and complete configuration of the system, i ncluding User Conservatism. Capacity is the most recent 512 dives.

•

Profile Graphical Information:

Depth Graph, Ascent Rate Graph, and Temperature Graph. Capacity is 128 hours (or 550 hours with expanded memory upgrade) at one second sampling.

•

Inter-Dive Events:

Number of Initializations, Unit Activation, Altitude Changes of 500 Feet, Low Batteries, Sensor Malfunction, Analyst

interface with Dive Comput er.

INTER- D IVE EVENTS:

The COMMANDER 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 Analyst

P.C. Inter face

version 3.05 or higher. Some Inter-Dive events are:

• Initialization of the unit.

• The unit is turned on

• Low batteries

• Altitude Changes of over 500 feet

• Sensor Malfunction

• Analyst

P.C. Communication

USER CONFIGURABLE I TEM S:

By using the

optional Analyst

Personal Computer Interface, the

user has the ability to change the following items:

Caution: Items that can be changed via Touch Contact Programming may be different from the factory settings.

Dive Time/date Stamp:

This is the internal clock that is used by the system to time-stamp each individual dive as it occurs. Due to changes in battery voltage and temperature, the internal Time-of-day clock may

slowly drift from the ideal. It is recommended that this clock be periodically set to local time via the Analyst

Metric or Imperial:

The diver may select whether the data is computed and displayed in Metric or Imperial units. The COMMANDER may be ordered either way as shipped from the factory.

Selectable Ascent Rate Bar Graph (Fixed or Proportional):

This option determines whether the Ascent Rate bar graph indicates the speed of ascent or the percentage of the selected maximum ascent rate. The COMMANDER is shipped from the factory as ‘Proportional’ (percentage).

Selectable Variable-By-Depth Ascent Rate Alarm (On or Off):

This option gives the diver the ability to utilize a fixed ascent rate warning or a warning based on depth. Should the diver prefer the fixed ascent rate warning the diver can select the maximum ascent rate limit from 20 to 60 feet per minute (See next topic). As shipped from the factory, this is set to ON. If the VARIABLE rate is selected then the warning will illuminate based on the following table:

DEPTH AVERAGE ASC EN T R ATE 60 feet and deeper 60 feet per minute 60 to 30 feet same as depth Shallower than 30 feet 30 feet per minute

Selectable Fixed Ascent Rate Alarm Limit:

If Variable-By-Depth Ascent Rate Alarm was set to OFF from the above topic, the user may enter the desired Ascent Rate for the alarm to sound.

Ascent Rate for Deco Predictions (20 to 60):

This option allows the diver to select the ascent rate to be used in the forecasting of the displayed Total Decompression time. The COMMANDER is shipped from the factory with this option set to 60.

Ascent Rate Responsiveness (0 to 7):

This option determines the responsiveness or sensiti vi ty of the Ascent Rate Bar Graph. Zero is highly responsive and seven is very slow. This feature is set to three as shipped from the factory.

Remaining Time Responsiveness (0 to 7):

This determines the responsiveness of the Remaining Time information that is displayed. Zero is highly responsive and seven is very slow. This feature is set to three as shipped from the factory

Max Depth Alarm:

This option allows the diver to select a maximum depth below which the diver does not wish to descend before an alarm is sounded. This function is disabled when in the Decompression Mode. This option may also be set via the Touch

Contact Programming. As shipped from the factory, the Depth Alarm is set for 130 feet.

Select Decompression Time Display (Total, Stop, Both):

There are three options for the manner in which the decompression time is displayed. If you select TOTAL, the decompression time displayed will indicate the total time you will spend in decompression.

Watch the Ceiling depth change in order to identify when to ascend to the next stop depth. If you select STOP, the decompression time displayed will indicate the time you must remain at the current Ceiling. When this time is 0:00, the Ceiling depth will decrease and the new stop time will be displayed. If you select BOTH, the TOTAL time and STOP time will alternate at the rate of once every 2 seconds. From the factory, the unit is set to ‘Both’.

Repetitive Dive Dependent Nitrogen (Off or On):

This option allows the dive computer to consider recent dive history’s effects on the nitrogen l oadi ng, particularly if the diver engages in i n vert ed profi l e diving. If “On” the recent dive history is used to compensate the nitrogen loading for the current dive. The COMMANDER is shipped from the factory with this feature set to ‘On’.

Temperature Dependent NDC Computations

(Normal or Reduced):

This feature compensates the decompression algorithm proportional to the ambient water temperature. See User & Environmental Adaptation, Water Temperature on page 34 for a detailed description of this function. The COMMANDER is shipped from the factory with this feature set to ‘Normal’.

Select Altitude <2000 feet as One Zone (Off or On):

This option provides "actual" altitude for any gi ven day at any diving location as explained in the “ALTITUDE ACCLIMATIZATION” on page 35. With changes in barometric pressure due to temperature and weather systems, it is possible, even expected, t o have a different apparent altitude at the same dive site from day to day.

While the seamless means of monitoring provides the most accurate decompression sc hedul e, all altitudes less than 2,000 feet above sea level can be treated in the algorithm as sea level if so selected. With this option ‘OFF’, the unit is calculating altitude in a seamless fashion. With this option ‘ON’, altitudes less than 2,000 feet above sea level will be treated as sea level. Regardless of the selection, alti tudes greater than 2,000 feet above sea level will be treated in a

seamless manner. From the factory, this is set to ‘Off’, seamless altitude from sea level to 15,000 feet.

Select Alternate Screen Viewing Time (3 to 10):

This option allows the diver to set the amount of time that the Alternate Screen will be viewed once it has been accessed. From the factory this is set to 4.

Select Display Backlight On Time (0 to 99):

This option allows the user to set the amount of time, in seconds, that the TACLITE™ stays on once activated. If this option is set to "0" the TACLITE™ will never activate, if set to "99" the TACLITE™ will stay on all the time and only turn off when the COMMANDER does. This option may also be set via the Touch Contact Programming. From the factory this is set to

10.

Select Audible Beeper Alarm (On or Off):

This allows the user to enable or disable the Audible Alarms and beeper. As shipped from the factory, this is set to ‘On’.

Select Ceiling Display Divided by 10 (On or Off):

This option allows the diver to select when in the Decompression Mode the Ceilings are displayed as 1 = 10, 2 = 20, 3 = 30 etc. (On) or as 10, 20, 30 etc (Off). From the factory this option is set to ‘Off’.

Selectable NDC Conservatism (0% to 50%):

This feature allows the diver to input an added degree of conservatism to the decompress i on algorit hm from 0 to 50 percent in one-percent increments. This may be desirable if the diver is dehydrated, tired, or has some other factor that warrants added conservatism. This option may also be set via the Touch Contact Programming. Conservatism is set to ‘0%’ as shipped from the factory.

Confined Water Protocol (T rainin g Mode) (Enabled or Disabled):

This option enables the Training Mode for the COMMANDER. In this mode the COMMANDER 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 Di ve Int erval peri o d from 10 to 30 minutes in one-minute increments. These changes permit the Instructor to record a complete training session, incl udi ng i n-water s u rf ace periods, as a single dive. As shipped from the factory, this is set to ‘Disable d ’.

This option can only be ‘Enabled’ via the Professional Edition of the Analyst

Training Mode Post Dive Interval Period (10 to 30):

If the Training Mode is enabled this allows the user to select the duration of the Post Dive Int erval period from a minimum of 10 minutes to a maximum of 30 minutes in one-minute increments. As shipped from the factory, this is set to 10.

This op tion can only be

set via the Professional Edition of the Analyst

Select Clock Functions (ON or OFF):

This option allows the diver to enable or disable the time of day Clock. If set to ‘ON’ the clock time can also be set via Touch Contact Programming. As shipped from the factory, thi s is se t to ‘O FF’.

Enter Clock Time:

This allows the diver to set the

clock’s time to that of the P.C. time.

Select Alarm Clock Audible Alarm (ON or OFF):

This option allows the diver to enable or disable the time of day Clock’s Alarm feature. If set to ‘ON’ the Alarm Clock time can also be set via Touch Contact Programming. As shipped from the factory, this is set to ‘OFF’.

Enter Alarm Clock Hour (0 to 23):

This allows the diver to program the time of day Alarm Clock’s hour setting. The Alarm Clock’s time utilizes a 24 hour format, i.e. 00:00 = 12:00 am, 20:00 = 8:00 PM, etc. This is also settable via Touch Contact Programming.

Enter Alarm Clock Minute (0 to 60):

This allow s the diver to program the time of day Alarm Clock’s minute setting. This is also settable via Touch Contact Programming.

Restore Original Configuration Settings:

This allows the diver to restore the original fact ory default settings with a single command.

SPECIFICATIONS:

Algorithm 16 Tissue Adaptive Modified Haldanean Computation Period Once every second Activation Manual and Water Maximum Depth Over 327 feet, 1 foot increments Depth Accuracy +/- 1% of full scale (+/- 3.3 feet) Maximum Altitude 15,000 feet, seamless Altitude Accuracy +/- 1000 feet Temperature Display 0 to 99 degrees F, 1 degree increments Temperature Accuracy +/- 2% of full scale (after the unit has

stabilized from a change in Temperature) Surface Time 0 to 9:59 hrs/mins, 1-minute increments Bottom Time 0 to 9:59 hrs/mins, 1-minute increments Time To Fly 0 to 36 hours, 1 hour increments No-Deco Time 0 to 9:59 hrs/mins, 1-minute increments Decompression Time 0 to 9:59 hrs/mins, 1-minute increments Decompression Ceiling 0 to 320 feet, 10 foot increments Dive Summary Storage up to 512 Dives Dive Profile Storage up to 550 Dive hours at one second sampling

depending on configuration Profile Sampling 1 second increments

Typical Battery Life* Over 2000 dive hours under normal diving

conditions or two years (whichever is first), TACLITE off. Over 40 hours, TACLITE on continuously. With Clock Mode on, Battery Life is over 1000 dive hours or one year.

* With fresh new ENERGIZER® brand alkaline batteries

Note: Specifications are additionally +/- one least significant digit due to

rounding. Specifications are subject to change without notice.

ENHANCEMENTS:

The COMMANDER is capable of having its’ capabilities enhanced. It can be upgraded to a one blend Nitrox ( can be done by an Authorized Dealer) or two blend Nitrox computer or a One or Two blend Nitrox/PO

computer. The Dive Profile Storage memory capacity can be upgraded from a base of 135 hours to 550 hours.

The COMMANDER must be returned to the factory for all upgrades except to that of a one blend Nitrox.

CLEANING THE COMMANDER:

Clean the unit only with fresh water after each use. Towel dry the unit, never use air pressure to dry the unit. This could damage the unit and will void the warranty. Do not use chemicals to clean the case or lens as this may damage the unit, or permanently fog the lens.

CHANGING BATTERY:

The batteries should be changed when the ‘BATT’ legend is seen or battery voltage reaches 2.1 volts as can be seen on the Information Display. The unit will operate until the battery voltage drops below 1.6 volts. Only use fresh, name brand N-Cell size Alkaline batteries f or maximum battery life. At this time,

Eveready

Energizer

Alkaline is recommended. Care should be taken not to activate the TACLITE™ during battery replacement. Be sure to confirm that the batteries are REALLY new and have not been sitting on a shelf losing life. Cold temperatures tend to shorten apparent battery life. Change batteries every t wo years regardless of battery condit ion.

CAUTION!!!

COMPLETE LOSS OF BATTERY POWER MAY CA USE ALL PREVIOUS DIVE NITROGEN LOADING TO BE LOST. THIS MAY AFFECT NI TROGEN CALCULATIONS ON NEARFUTURE DIVES . AFTER A BA TTERY CHANGE, CONFIRM THAT NO-DECOMPRESSI ON TI ME DATA IS REASONABLE DURING PRE-DIVE PREDICTION MODE. DIVE-OF-DAY NUMBER GOING TO ZERO IMMEDIATELY AFTER CHANGING BATTERIES IS ANOTHER INDICATION OF A LOSS OF NITROGEN LOADING.

Plus end goes in First.

When installing new batteries, ensure that the positi ve “+” end of the battery is inserted into the battery compartment first. Inspect the battery cap O-rings for nicks and scratches. If either O-ring is dam aged carefully remove both O-rings and replace with new silicone O-rings. Lightly lubricate each end of the batteries with silicone grease or petroleum jel l y to help minimize corrosion and therefore extend battery l i fe.

When reinstalling the battery cap, lubricate the Orings lightly and slowly twist the cap into place using a coin (US Quarter supplied). Press the coin into the battery cap slot firmly to prevent slipping and damaging the slot. Ensure there is no dirt or debris on the O-rings or the mating surface and that the O-rings are properly installed.

As the battery cap is screwed in, carefully obs erve that the double O-rings install correctly. Ask an Authorized Cochran Dealer for a demonstration.

It is best to have the new batteries ready to immediately install since the COMMANDER was designed to allow for battery changes without resetting and losing any Nitrogen residuals. This period of time is typically 30 seconds, but varies with temperature and the voltage of the batteries being replaced. It can be significantly less if batteries are not replaced promptly when the ‘BATT’ legend first comes on. Again care should be taken not to activate the TACLITE™ during battery replacement, if the TACLITE™ is activated it will significantly reduce the time that the COMMANDER allows for battery changes without losing Nitrogen resi duals.

If the batteries are allowed to discharge too low, or if removed for too long, the COMMANDER may enter a state where it will not turn on even with new batteries. If this occurs, remove the batteries and allow the unit to set for 30 minutes and then install fresh batteries. This will, of course, erase any residual accumulated Nitrogen from previous dives maki ng the next dive appear as a ‘clean’ dive. This procedure could also effect the internal Time of Day Clock’s settings and these settings should be verified via the Analyst

P.C.

Interface.

ASSISTANCE, REPAIR & MAINTENANCE:

The Cochran Commander does not require an Annual Maintenance, but if you suspect that your COMMANDER is not operating correctly, please contact our Customer Support Departm ent in the USA for assistance at 972.644.6284 or FAX details to

972.644.6286 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

PRESSU RI ZE D AI R! (Voids Warra nty)

• NEVER REMOVE THE LENS FROM THE UNIT!

(Voids Warr an t y)

• ONLY USE FRESH WATER TO CLEAN UNIT!

NEVER USE SOLVENTS! (Voids Warranty)

• DO NOT USE A SCREWDRIVER TO REMOVE

BATTERY CAP! (Voids Warranty)

• ALWAYS KEEP FRESH ENERGIZER

BRAND

BATTERIES INSTALLED!

• LUBRICATE BATTERY ENDS WITH THIN FILM OF

SILICONE GREASE!

REPLACEMENT PARTS:

Batteries (2) Battery Cap O-rings Battery Cap Assembly Pins (2) Replacement Wrist Strap (long Gray) Wrist Strap (long, black) Retractor Only Retractor with Compass Lens Protector (Pkg. of 3)

ANALYST

Personal Computer Interface

The ANALYST

Personal Computer Interface is a complete hardware/software syst em that uploads data from the Cochran COMMANDER 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 also to enter and store information for each dive in a logbook.

FCC LABEL FCC ID: LYP744556-03 This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) this device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.

INTERFERENCE STATEMENT

NOTE: This equipment has been tested and found to comply with the limits for a Class B digital devic e. If not installed and used in accordance with the instructions, it may cause interference to radio communications. The limits are designed to provide reasonable protection against such interference in a residential situation. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause interferenc e to radio or television reception, which can be determined by turning the equipment on and off, the user is encouraged to try to correct the interference by one or more of the following measures:

• Reorient or relocate the receiving antenna of the

affected radio or television.

• Increase the separation between the equipment

and the affected receiver.

• Connect equipment and the affected receiver to

power outlets on separate circuits.

• Consult the dealer or an experienced radio/TV

technician for help.

MODIFICATIONS

Changes or modifications not expressly approved by Cochran Consulting, Inc. could voi d the user's authority to operate the equipment.

SHIELDED CABLES

This product is designed to be used only with the Analyst

interface cable (RS-232) to maintain

compliance with FCC Regulations.

PATENT INFORMATION

Protected under one or more Foreign or US patents.

5,899,204 5,794,616 5,617,848 5,570,688

Other patents may be pending. All specifications subject to change without prior

notice. Analyst

The CE mark is used to mark conformity with the European Union EMC directive 89/336/EEC. Cochran dive instruments fulfill all the required EU direc tives .

PREN 13319

PREN 13319 “Diving accessories – Depth gauges and combined depth and time measuring devices – Functional and safety requirements test methods” is a European diving depth gauge standard draft. Cochran dive instruments are desi gned and test ed to comply with this standard draft.

LIMITED WARRANTY

To the original purchaser ("OWNER") only, Cochran Undersea Technology, a division of Cochran Consulting, Inc. ("COCHRAN" ), represents this Product to be free of defects in materials and workmanship under normal SCUBA use for 24 months from the date of shipment from COCHRAN to the Authorized Dealer or Distribut or. For purposes of establishing warranty eligibil it y, this dat e 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 Limit ations" section below, will at the sole discretion of COCHRAN, be repaired or replaced with a new or refurbished unit of comparable or better function and/or condition. COCHRAN is not responsible for any incidental or secondary damages as a result of Product malfunction.

WARRANTY CONDITIONS and LIMITATIONS

Product must have been obtained from a COCHRAN Authorized Dealer. Contact COCHRAN for verification of dealer stat us. This Limited Warrant y is not transferable.

The Warranty Registration card must be sent to COCHRAN within 15 days of purchase in order to validate Limited Warranty.

Failure to provide proper care for this Product will render this Limited Warranty null and void. Damages or malfunction resulting from accidental or deliberat e abuse, tampering, battery leakage, exceeding maximum intended operating depth or other parameters, extreme heat or cold, or other conditions which COCHRAN may deem to be outside the intended scope of this Limited Warranty are not

covered. Plastics, O-rings, batteri es, battery life, and flooded battery compartments are NOT covered by this Limited Warranty.

This Limited Warranty will be rendered null and void if an attempt is made to establish communications with the computer with any hardware and/or software other than the Cochran approved Analyst

Interface. OWNER is responsible for shipping this Product to COCHRAN for service, and paying all ass ociated costs, including shippi ng, i nsurance, and import duties. OWNER may take Product to an Authorized Dealer to arrange service under terms of this Limited Warranty. COCHRAN will return Product to OWNER or Dealer via a method and carrier of its choosing. Costs for requested expedited return shipping will be the responsibility of OWNER. Product returned for service under terms of this Limited Warrant y must be accompanied by a photocopy of the original sales receipt in order for warranty repair or replacem ent to be performed if the Warranty Registrati on Card is not on file.

STATEMENT of LIMITED LIABILITY

A mathematical model is used by this Product to calculate physiologic al effects of SCUBA divi ng related to use of compressed air or other breathing mixtures while at depth. Such effects specifically relate to nitrogen absorption into and elimination from body tissues, as well as effects of oxygen used in Enriched Air Nitrox breathing mixtures.

However, because of the number of variables and the varying degrees to which they may affect indivi dual s engaged in SCUBA diving, COCHRAN DOES NOT GUARANTEE THAT USE OF THIS PRODUCT WILL PREVENT DECOMPRESSION SICKNESS OR ANY OTHER CONDITION OR INJURY INCURRED W HILE USING THIS PROD UCT.

These influencing variables may incl ude, but are not limited to, dehydration, obesity, age, old injuries, or other physical conditions on the part of the diver, or environmental extremes of heat or cold, or poor training, or diving practices, any of which may promote the onset of decompression sickness or other harmful effects.

This Product is sold and intended to be used only as a guide, providing the TRAINED and CERTIFIED diver the information needed to make safe diving decisions. It is expressly understood that by buying and/or using

this Product the Diver assumes A L L RISK as to its operability, 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 result i ng from its use, even if COCHRAN has been advised of such occurrences or damages.

These products must be handled with care and properly maintained to assure the optimum performance. Users must possess the proper traini ng for SCUBA diving activit i es and shoul d be fully educated in the operation of this product. Users are encouraged to possess and utilize a redundant (backup) computer for their dive planning and execution. Divers are always encouraged to dive with a buddy at all times.

COCHRAN strongly supports and agrees with maximum depth limits of 130 feet for recreational SCUBA diving, as established by recogni zed trai ni ng and certification agencies, and in no way encourages diving beyond these or any prudent lesser limits as may be necessitated by environmental, di ver-specific, or other conditions.

THE WARRANT Y AN D REM EDIES SET FORTH ABOVE ARE EXCLUSIVE AND IN LIEU OF ALL OTHERS, WHETHER ORAL OR WRITTEN, EXPRESSED OR IMPLIED. COCHRAN UNDERSEA TECHNOLOGY SPECIFICALLY DISCLAIMS ANY AND ALL IMPLIED WARRANTI ES, INCLUDING, WITHOUT LIMITATION, WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

No Cochran Undersea Technology dealer, agent, or employee is authorized to make any modification, extension, or addition to this warranty.

USER & ENVIRONMENTAL ADAPTATION:

The COMMANDER is one of the new breed of Dive Computers that adapts its algorithm to the users diving environment and style as originall y pioneered by COCHRAN. All of COCHRAN’s newer dive computers incorporate this capability. The factors that are used for this “Adaptation” in the COMMANDER are:

Water Temperature Salt/Fresh Water Compensation Microbubble Altitude Acclimatization User Conservatism Previous Dive Profiles

WATER TEMPERATURE:

Diving in cold water can lead to a lower diver core and skin temperature which can affect the gas exchange rate of the body’s tissues. The COMMANDER features two modes of Temperature Compensation, Normal or Reduced. The COMMANDER progressively makes its nitrogen algorithms more conservati ve as the water temperature declines below 75 degrees F. Above this water temperature, there is no temperature compensation. In the Reduced Mode, the algorithms are made more conservative by approximately onehalf the amount of the Normal Mode. If the diver is wearing an insulated dry suit and is relatively warm even in cold water, this temperature compensati on factor may be set to Reduced Mode at the divers discretion using the Analyst

PC software.

MICROBUBBLE:

There are several theories regarding the exact method by which a nitrogen bubble forms from a microbubble which was formed from micronuclei. Currently the predominant theory states that more rapid ascents accelerate bubbl e formation. The COMMANDER comprehends and adjusts for this phenomenon.

USER CONSERVATISM:

Current dive computers cannot tell if the diver is dehydrated, tired, sm okes, overweight, or has some other physical issue that may require additional conservatism i n the nitrogen algorithm. The COMMANDER allows the diver to input an added degree of conservatism to the nitrogen algorithm from 0 to 50 percent in one-percent increments. This can be done via the Touch Contact Programming Mode or with the Analyst

Personal

Computer Interface.

PREVIOUS DIVE PROFILES:

Under some circumstances, rece nt dive activity can have an effect on nitrogen loading, particularly if the diver engages in inverted profile diving. This occurs when a deep dive is followed by an even deeper dive. This recent dive history is used to compensate the nitrogen loading for the current dive. This can be enabled or disabled with the Analyst

Personal Computer Interface.

SALT/F R ESH WATER COMPENS ATIO N (High/Low Water Conductivity):

There is approximately a three percent difference in depth readings taken in salt water versus fresh water. Some dive computers are calibrated in feet of fresh water and some are calibrated in feet of seawater. Diving in a medium different from what the dive computer is calibrated for will cause apparent depth errors. Only COCHRAN dive computers, including the COMMANDER, 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. Caution must be taken in interpreting this reading since some apparent fresh water is actually high in minerals or contaminants and is correctly compensated as salt water (High Conductivity). This commonly occurs in some caves, s prings, and lakes.

ALT ITUDE ACCL IM AT IZ AT ION:

Driving or flying to a dive site significantly higher in altitude requi res special modifications to the "sea level" algorithm. The COMMANDER regularly samples the ambient barometric pressure to determi ne thes e changes in altitude whether the unit is On or Off. Accordingly, the decompression algorithm is changed to reflect thes e barometric pressure changes. Note that temperat ure and weather systems also affect barometri c pressure and hence, apparent altitude. Using the Time-To-Fly digits, the number of hours required to “adapt” to the new altitude is immediately known to the diver. If a significant altitude change occurs, a minimum of one hour should pass before diving to allow the unit to adapt to this new altitude. Rapid changes in altitude should be avoided. The dive computer may interpret a rapid change from a higher altitude to a lower altitude as a dive. Should this occur, removing the batteries for te n min utes will reset the computer, however, all tissue nitrogen loading will also be lost.

Should it be desired to initiate a dive PRIOR to completing the adaptation time, the COMMANDER 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

PC Interface, ZONE or SEAMLESS altitude compensation may be selected.

ZONE

all altitudes less than 2,000 feet above sea level use the sea-level algorithm. At altitudes great er than this, altitude compensation is “seamless”; literally, every smal l fraction of gained altitude is

considered in adjusting the algorithm. ZONE will reduce the occurrences of obtaining slightly diff erent altitude readings and corresponding nodecompression (NDC) limits when diving within a given area. However, ZONE reduces the accuracy of the altitude compensation for the first 2,000 feet above sea level, since all altitudes below 2,000 feet are treated as sea level. The advantage in ZONE is that changes in apparent altitude due to temperature or weather changes at sea level will not affect the NDC computations.

SEAMLESS

, the algorithm is adjusted for extremely

small changes in altitude. However, a difference i n altitude may be seen from day-to-day at a given dive site due to temperature or weather systems and their effect on barometric pressures. SEAMLESS will provide the most accurate altitude compens ation algorithm, but normal variations in atmos pheric barometric pressure may affect t he no-decompression time which is more predominantly seen in the Pre-dive Prediction forecast.

CAUTION: The COMMANDER will not perform

Altitude Acclimatization if the touch contacts are shorted or bridged. Rinse the unit with clean fresh water and dry it with a towel after each dive. Transporting and storing the unit in its case will help prevent the possibility of the contacts being shorted or bridged.

WARNING: While your COMMANDER will

automatically adjust its no decompression algorithm for altitude, you should NOT attempt to dive at altitudes greater than 1,000 feet above sea level without first completing a sanctioned altitude diving course from a recognized training agency for recreational diving. The COMMANDER should not be used for this type of diving by anyone without this important training.

METRIC/IMPERIAL MODES:

Most dive computers always compute in either Metric or Imperial units and merely convert the display to the other units. The COMMANDER actually computes and displays i n the selected units giving maximum accuracy and user familiarity . If the computer is co mputing and displaying in Metric, the “METRIC” legend will be illuminated when the computer is on. Metric/Imperial selection is made using the Analyst

software. Changing Modes does not affect any profiles or data stored in the computer.

LOW BATTERY INDICATIONS:

Fresh ENERGIZER

brand alkaline batteries should read about 3. 2 volts on the Information Screen. When the battery voltage drops to 2.1 volts, the “BATT” legend will be illuminated. It is recommended to change the batteries at this point, but several di ves might still remain possible. When the battery voltage dec ays to

1.8 volts, the “BATT” legend will begin to flash on and off. Once the “BATT” legend begins to flash the TACLITE™ is deactivated, to conserve the remaining battery power even though the unit may be on a dive, and can not be activated until fresh batteries are installed. While there should be sufficient battery power to normally complete a dive, it is not recommended to begin a new dive until fresh

ENERGIZER

brand alkaline batteries are instal l ed.

After the computer automatically turns its e lf off (enters Sleep Mode) 70 minutes after a dive, it cannot be turned back on if the battery voltage is less than 1.6 volts. Fresh ENERGIZER

brand alkaline batteries

must be installed. See the “BATTERY CHANGES” section of this manual for detailed information on how to change batteries.

CAUTION!!!

COMPLETE LOSS OF BATTERY POWER MAY CA USE ALL PREVIOUS DIVE NITROGEN LOADING TO BE LOST. THIS WILL AFFECT NI TROGEN CALCULATIONS ON NEARFUTURE DIVES . AFTER A BA TTERY CHANGE, CONFIRM THAT NO-DECOMPRESSI ON TI ME DATA IS REASONABLE IN THE PRE- DI VE PREDICTION MODE. DIVE-OF-DAY NUMBER GOING TO ZERO IMMEDIATELY AFTER CHANGING BATTERIES IS ANOTHER INDICATION OF A LOSS OF NITROGEN LOADING.

TABLE OF CONTENTS

Page Number Product Introduction 1 Side Touch Contacts 1 Turning the Product On & Off 1 Main Operating Modes 2

Surface Interval 3 Dive Mode 4 Ascent Rate Bar Graph 5 Decompression Mode 7

Post Dive Interval 8 Confined Water Protocol (Training Mode) 9 TACLITE™ 9 Clock Programming 10 Clock Programming Procedure 11 Clock Programming Screens 12 Touch Programming Procedure 13 Touch Programming Menu 14 Touch Programming Screens 14 Pre Dive Prediction 15 Information Display 16 Depth Alarm 16 Conservatism 17 Taclite™ 17 Logbook 17 Logbook Screens 18 Warning Indications 20 Sensor Warning Mode 21

Sensor Warning Screen 21 Data Storage Types & Capacity 21 Inter-Dive Events 22 User Configurable Options 22 Product Specifications 26 Enhancements 27 Cleaning the Unit 27 Changing Batteries 27 Assistance, Repair, & Maintenance 29 Replacement Parts 29 Analyst

Personal Computer Interface 29 Product Certifications 30 Limited Warranty and Liability Stat ement 31 User & Environmental Adaptati on 33 Metric & Imperial Modes 36 Low Battery Indications 37 Table of Contents 38 Figures Index 39

FIGURES INDEX

Fig # Page Number

1 Self-Test Screen 2 2 S urface Interval - Primary Screen

No Nitrogen 3

5 Surface Interval - Primary Screen

With Nitrogen 3 10a Dive Mode 4 12a Ascent Bar Graph 6 14 PreDive Prediction 15 16d Deco Mode - Showing Total Time 7 17d Deco Mode - At zero depth 8 18 Sensor Warning - Primary Screen

- Showing Depth Sensor 21 19 Post Dive Interval - Primary Screen 9 22 Programming Mode -

PreDive Prediction Menu 14 23 Programming Mode - Information Menu 14 24 Programming Mode - Information Display 16 25 Programming Mode - Depth Alarm Menu 14 25a Programming Mode - Setting Depth Alarm 16 26 Programming Mode -Conservatism 15 26a Programming Mode - Setting Conservatism 17 33 Programming Mode - TACLITE™ Menu 15 33a Programming Mode

Setting TACLITE On Time 17 34 Programming Mode - Logbook Menu 18 34a Programming Mode - Logbook Menu

- Primary Screen 15

34b Programming Mode - Logbook Menu

- Alternate Screen 18 35 Logbook Mode - Primary Screen 19 36 Logbook Mode - Primary Screen

Deco Dive 19 37b Logbook Mode - Alternate Screen 19 38b Logbook Mode - Alternate Screen

Deco Dive 19 40 Programming Mode - Clock Menu 12 41a Programming Mode – Clock Alarm

– On/Off – showing Off 12

41b Programming Mode – Clock Alarm

– On/Off – showing On 12 42 Programming Mode – Clock with Alarm 12 43 Programming Mode – Clock without Alarm 12

Cochran

COMMANDER

Owner's Manual

English - Imperial

Ver: CmdrAir-1.02

Manual Part Number: 4100811

1758 Firman Drive

Richard s on, Texas 75081, USA

Phone 972-644-6284 Fax 972-644-6286

www.divecochran.com

Cochran COMMANDER, COMMANDER EMC-20H Owner's Manual

Specifications and Main Features

Frequently Asked Questions

User Manual