H2Odyssey Fathom-55 Owner`s Manual

H2Odyssey Fathom-55 Owner`s Manual
www.h2odyssey.com
H2Odyssey
Fathom-55
Owner's Manual
English - Imperial
Ver: Fathom55i.100
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PRODUCT INTRODUCTION: The Fathom-55 is quite simple to use and
operate, but underneath that simplicity lies a significant level 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 this device. If you are using the
Fathom-55 with the Nitrox functions enabled, the diver specifically
acknowledges that he has been adequately and thoroughly trained and
certified to engage in Nitrox diving by a professional, competent,
recognized training agency.
This Manual is divided into the following Sections:
Section
•
Operation
•
Clock Operation
•
Touch Programming
•
Warnings
•
Oxygen & PO2 factors
•
Configurable Items
•
Specifications and Maintenance
•
Liability, and Warranty
•
Itemized Index and Subjects
TURNING OFF THE Fathom-55: After the Post Dive Interval following a
dive, the Fathom-55 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
Fathom-55. The unit will continue calculating Surface Interval,
compartment off gassing as required, and any changes in altitude as it
affects Nitrogen Loading. The current Surface Interval and PreDive
Predictions can be viewed by reactivating the unit
MAIN Fathom-55 OPERATING MODES:
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•
•
•
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Page
1
4
5
7
7
9
10
11
13
Surface Interval (No Nitrogen Residual)
Surface Interval (With Nitrogen Residual)
Dive Mode (Normal No Deco)
Decompression Mode
Post Dive Interval
Touch Programming
SURFACE INTERVAL:
TOUCH CONTACTS:
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 Fathom-55 can detect the difference between wet
fingers, metal objects, fresh water, salt water, and a PC interface probe.
TURNING ON THE Fathom-55: Although the Fathom-55 automatically
turns on when it is submerged in water, it is STRONGLY recommended
that the unit be manually powered up by simultaneously touching
Contacts 1 and 2 for two seconds with two wetted fingers. 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 these 60 minutes, the Fathom55 automatically shuts off. Every time Contacts 1 & 2 are bridged with
wet fingers, the unit will stay on for one full hour.
The Fathom-55 will not turn on if the altitude is greater than 16,000 feet
or if the battery voltage is less than 1.6 volts, or a fault is detected during
the self-test.
After completion of the Self-Diagnostic mode or after the Post Dive
Interval following a dive, the Fathom-55 enters the Surface Interval. This
period has two screens, a Primary and an Alternate. The Primary and
Alternate screen alternate ever four seconds, this cycle time is settable
®
via Analyst . The Primary 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.
The Alternate Screen displays current calculated CNS, time of day
(alternates with current calculated OTU), and current battery voltage.
Figure 2 shows the display with no residual Nitrogen (a clean Dive).
Figure 4 shows the display with residual Nitrogen (a repetitive dive).
Figure 5 shows the alternate screen without residual Nitrogen, figure 6
with.
As the Fathom-55 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 five seconds. During this time,
all of the segments in the display are turned on so that the user can
confirm their operability. 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.
1
“Barometric Altitude” is indicated in six ranges via the Ascent Rate Bar
Graph as follows (Altitude compensation is seamless up to 16,000 feet
above sea level). The six ranges are for display purposes only: The
Fathom-55 actually senses and computes extremely small altitude
changes and hence, is called “Seamless”. The term “Barometric Altitude”
is used instead of just “Altitude” because the Fathom-55 measures
Barometric Pressure to determine Altitude. Barometric Altitude can vary
from actual Altitude by over +/- 1000 feet! Barometric Altitude is what
important to the body when diving.
DIVE MODE:
Whether in the Surface Interval, PreDive Prediction Mode, Programming
Mode or the Logbook Mode, the Fathom-55 will automatically enter the
Dive Mode whenever the unit determines that it is in water deeper than
five feet.
On the Primary Screen the Surface time will be replaced with the current
Bottom Time. Maximum Depth will be replaced with current Depth,
displayed in one-foot increments. Bottom Time will begin once the
Fathom-55 senses that the diver has descended below five feet and
continues until the diver has ascended above three feet. The maximum
Bottom Time displayed is 19 hours 59 minutes.
The Alternate Screen will display the current FO2 value that the unit is
using in its NDC calculations, the current CNS and OTU values, the
current battery voltage and the Max Depth (so far this dive). (Figure 7)
“Surface Time” starts at zero after a dive and begins counting minutes. If
the computer shuts off (enters the sleep mode) and is turned on with
Nitrogen residual left, the Surface Time continues to count. If the
computer shuts off (enters the sleep mode) and is turned on with no
Nitrogen residual, the Surface Time will be zero.
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. When the Depth Alarm
is issued the “WARNING” legend and Depth Digits will flash on and off
once per second. The depth alarm is disabled if in the Decompression
Mode since flashing depth digits have another meaning in this Mode.
“Dive of Day” starts at zero and increments after each dive regardless of
the calendar day. When there is no remaining Nitrogen residual, the Dive
of Day is set to zero and the computer is referred to as a ‘clean’ system.
The maximum depth achieved on the current dive is shown as “MAX
DEPTH”. This is updated once per second.
“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.
“REMAIN TIME” (NDC) is the remaining time (in hours and minutes) that
the diver can stay at the current depth without requiring decompression.
2
A “Two Minute Warning” will be issued when this time reaches two
minutes or less. The “WARNING” legend and “REMAIN TIME” digits will
flash. By immediately ascending to a shallower depth, the diver may
avoid a required decompression stop.
DECOMPRESSION MODE:
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 like 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 Analyst PC software Interface (see Analyst
Section), if the 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 Fathom-55 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 to 30 feet
Less than 30 feet
60 feet per minute
feet per minute equal to the depth
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 indicates 20% (one-fifth) of
the selected Maximum Ascent Rate.
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.
Should a no-decompression limit be overstayed, the Fathom-55 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 ten-foot 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 lower 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 time
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.
If the diver has an Ascent Rate that exceeds the selected maximum, the
entire Ascent Rate Bar Graph will flash 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”.
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-gassing or Outgassing will be computed regardless of the divers’ current depth.
As shipped from the factory, the Ascent Rate is set for VARIABLE-BYDEPTH AND PROPORTIONAL.
3
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. 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 Fathom-55.
CONFINED WATER PROTOCOL (Training Mode): The Fathom-55 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 (swimming pools, shallow lakes, lagoons,
etc.) or calm open water environments that have less than 1-foot seas. In
the Training Mode, the Fathom-55 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, via the
®
Analyst from10 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 in-water surface periods, as a single dive. The
Training Mode can only be enabled/disabled via the Professional
®
Edition of the Analyst PC Interface.
If the diver surfaces before satisfying his decompression obligation, the
Fathom-55 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 FO2 of 21%. The unit will
continue to log data and perform as if actually in a dive. When the
decompression obligation is finally satisfied, the ten-minute “PostDive
Interval” will begin.
CLOCK MODE: The Clock operating mode of the Fathom-55 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:
•
•
•
•
•
•
•
NOTE: COCHRAN does not intend for this instrument to be used for
deliberate Decompression diving.
Setting Date Clock Time
The PreDive Prediction Mode
Displaying Mode, mode value, CNS, OTU & battery voltage
A Maximum Depth Alarm
An Added degree of Conservatism from 0 to 15%
Setting oxygen percentage of blend 1 in the Constant FO2 Mode
Access the Logbook Mode
While all Fathom-55 configurations share certain programming
features others are dependent upon the specific configuration of the
unit. Refer to the appropriate manual section for the relevant
programming menu items.
POST DIVE INTERVAL:
During the first ten minutes (or up to thirty minutes if the unit is in the
Training Mode) after a dive, the Fathom-55 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 dive. In
this case, Bottom Time will NOT include the time spent on the surface in
this Post Dive Interval. However, when reviewing the profile with the
®
Analyst , the time spent on the surface in this period will be shown.
TOUCH PROGRAMMING - CLOCK: When the Fathom-55 is placed
into the Clock mode it will display the time of day in an am/pm day format.
The clock will continue to run when the Fathom-55 is in the Dive
Computer Mode. The Fathom-55 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.
NOTE: This Time of Day clock is the same clock that is used to time
stamp dives. Modifying the Time of Day clock and/or the Date will
®
affect the Local Time/Date as viewed via the Analyst .
CLOCK PROGRAMMING PROCEDURE:
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 the CLoCk Menu is seen on the display (fig
30).
3. To enter the Clock submenu, bridge Contacts 1 & 2 with wetted
fingers. This will cause the unit to display the CLoCk dAte selection
(fig 31).
4. Using a coin or other conductive metal object, bridge Contacts 1 & 2
to access the month of the CLoCk Date setting screen fig 32.
5. Bridge Contacts 1 & 2 with wetted fingers. This will cause the
months tens digit to flash.
6. Shorting Contacts 2 & 3 with a coin will increment the numeric value;
continue until the required value is displayed.
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 the Day short Contacts 1 & 2 with a coin, increment as in
step 6 and 7 (fig 34).
9. Repeat step 5 through 7 until all digits have been programmed.
10. To select the Year short Contacts 1 & 2 with a coin, increment as in
step 6 and 7 (fig 33).
11. Repeat step 5 through 7 until all digits have been programmed.
12. To set the Time short Contacts 1 & 2 with a coin, increment as in
step 6 and 7 (fig 40).
13. Repeat step 5 through 7 until all digits have been programmed.
4
14. To save the changes that have been made an d to enter the Clock
Display Mode, bridge Contact 1 & 2 with a coin or other conductive
metal object. Once the next programming option is displayed the
changes have been saved.
case of multi-digit numbers, the least significant digit will flash. The
clock will toggle between on and off.
5. Using a coin or other conductive metal object, bridge Contacts 2 & 3
to increment the numeric value. 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 shown.
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.
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 Fathom-55 is in the Dive Computer Mode
before commencing a dive.
Figures 30, 31, 32, 33, 34 and 41 show how the Clock programming
display screens appear.
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 MENU - Air Only:
The following table lists the various programming choices with their
display identification and figure number.
Identification Description
CLC
PdP
InF
dEP AL
Clock – if enabled
PreDive Prediction
Misc. Information
Depth Alarm, Max value
is 320 feet
Added Conservatism, Max
value is 15%.
Logbook
Con
LOG
Figure 40 shows how the Clock display screen appears.
Figure
Page
30
12
14
5
8
8
16
8
18
24
8
8
PROGRAMMING MENU - SINGLE GAS NITROX
The following table lists the various programming choices with their
display identification and figure number.
Identification Description
CLC
PdP
InF
dEP
NOTE: Once the Fathom-55 is placed in Clock Mode the unit will
remain in that mode until exited by the diver.
AL
Con
TOUCH PROGRAMMING MODE:
EAn
NOTE: To enable the Programming Mode, the Fathom-55 must be on
the Surface and not in the Post Dive Interval.
LOG
NOTE: All visual alarms are suspended while the Fathom-55 is in the
Programming Mode. Upon exiting the Programming Mode all
alarms are reactivated.
1
Clock – if enabled
PreDive Prediction
Misc. Information
Depth Alarm, Max
value is 320 feet.
Added Conservatism, Max
allowed value is 15%.
Oxygen percentage of Blend,
Allowed value 21 to 50
Logbook
Figure Page
30
12
14
5
8
8
16
8
18
8
20
24
8
8
TOUCH PROGRAMMING - PREDIVE PREDICTION:
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 what was stored is reviewed.
NOTE: If the Fathom-55 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 Fathom-55 will retain
the modified programmed settings but options that have not
been modified will retain their current settings.
TOUCH PROGRAMMING MODE - PROCEDURE:
PreDive Prediction is accessed via the Touch Contact Programming
Menu. This enables the diver to view the PreDive Prediction information
at the touch of the Contacts. The Fathom-55 PreDive Prediction starts at
30 feet and increases in 10 feet increments. PreDive Predictions will
terminate when the No-Decompression (NDC) time prediction reaches
two minutes or a maximum depth of 320 feet is reached. Additional
Conservatism, Residual Nitrogen, blend #1 oxygen percentage and
Barometric Altitude can affect PreDive Predictions. Once the maximum
PreDive Prediction depth has been reached the unit will return to the
Surface Interval.
During the PreDive Prediction Mode, the unit will compute and display the
maximum safe time and the calculated PO2 value at that depth.
Contacts 1, 2, & 3 are for programming sequences.
To begin the programming sequence:
1. Analyze the gas blend using a calibrated Oxygen Analyzer.
2. Turn the unit on.
3. Using a coin or other conductive metal object, briefly bridge Contacts
1 and 2 until the Programming Menu is seen on the display. The
Programming Menu options depend on whether the unit is activated
for Clock, and /or Nitrox. 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.
4. To reprogram the displayed menu values, bridge Contacts 1 & 2 with
wetted fingers. This will cause the current setting to flash or in the
5
TOUCH PROGRAMMING - BLEND #1:
The oxygen percentage of Blend #1 can be programmed from 21.0% to
50.0%. Once programmed the oxygen percentage will remain at the
value programmed until changed by the user.
TOUCH PROGRAMMING - INFORMATION DISPLAY:
The InFormation display is accessed via the Programming Mode. The
information presented will depend on the configuration of the dive
computer. The information in the lower middle of the screen indicates
whether unit is in the Constant FO2 (Nitrox) or Air Mode. The following
table lists the identification and the description.
Identifier
F0
F1
Description
Air only
Single Blend Nitrox, 21 to 50%
TOUCH PROGRAMMING - LOGBOOK MODE: The Logbook of the
Fathom-55 has two screens, a Primary Screen and an Alternate Screen.
The Logbook is accessed via the Touch Contact Programming (see page
15). This enables the diver to view dive statistics; the Fathom-55 has the
ability to provide diving data for the most recent 256 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.
Battery voltage is displayed in the middle right center of the screen as a
two-digit number with an implied decimal point. If the unit is configured
for Constant FO2 (Nitrox), the screen will display the current CNS, along
with the Time of Day and battery voltage. The current CNS exposure
level is displayed on the middle left as a two-digit number proceeded by a
lower case “c”. The current time is displayed in the middle center. The
CNS value is expressed as percentages. Figure 24a displays a typical
InFormation screen for a unit that is enabled for Nitrox.
Information contained in the Logbook include:
Overall Dive Number
Fastest Rate of Ascent
Bottom Time
Maximum Depth
Maximum DEC Time (Deco Dive)
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.
Minimum NDC Time
Minimum Water Temperature
Surface Interval Before Dive
Ending Battery Voltage
Maximum Ceiling (Deco Dive)
The Dive Number that is displayed on the Logbook Menu screen (Figure
25) permits the diver to identify the number of dives made with that
Fathom-55. If the example shown is the most recent dive made, it can be
identified that 136 dives have been made with this unit.
TOUCH PROGRAMMING - CONSERVATISM: This programming
function allows the diver to input an added degree of Conservatism into
the Fathom-55 algorithm. Via Touch Programming the Conservatism
can be set from 0 to 15%.
th
Figure 26 shows that dive 136 started at 10:18 AM on the 8 of October
2003.
6
Figures 27 & 28 display the Logbook of a Normal Dive.
•
If the battery voltage goes below 2.1 volts, the “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) remaining, the “WARNING” legend will illuminate and flash
along with the Remaining NDC time digits.
•
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.
•
If the dive computer determines that either the Depth or
Temperature sensor is malfunctioning. The “WARNING” and
"SENSOR" legends will illuminate, The Screen will also display
either "DEPTH" and/or "TEMP".
•
For High PO2, see “OXYGEN TOXICITY FACTORS” on page 7.
•
For High CNS, see “OXYGEN TOXICITY FACTORS” on page 7.
SENSOR WARNING: The Fathom-55 has the capability of monitoring
the integrity of it’s' 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” and "SENSOR" legends The "DEPTH" Legend will
illuminate to indicate the low-pressure transducer or the "TEMP" legend
for the temperature transducer (see figure 39). The “WARNING” legend,
along with either the Temperature digits or the Depth digits and the
Legend will flash once per second. In the highly unlikely situation were
both sensors are detected as having errors, both the "DEPTH" and
"TEMP" legends will illuminate. This warning will be issued whether the
computer is in the Surface Interval, Dive Mode, Decompression Mode or
Post Dive Interval. In the unlikely case that your computer issues one of
these warnings the unit should be returned to the factory for evaluation
and/or repair.
Figure 39 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 "TEMP“.
While Figures 29 & 29A display that of a Deco Dive
OXYGEN TOXICITY FACTORS: The Fathom-55 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.
As long as one or more of these three parameters is outside its limits, the
“WARNING” legend on the display will continue to flash.
These three functions are not active if the NITROX capability is disabled
®
via the Analyst PC Interface.
PARTIAL PRESSURE OF OXYGEN (PO2): High levels of PO2 can
cause severe Oxygen poisoning. Widely different levels of PO2 can
®
affect individual divers. The user via the Analyst can set the PO2 alarm
to any level between 0.50 ATA and 1.59 ATA. As shipped from the
factory, this is set to 1.40 ATA. Should the PO2 be above the alarm set
point, the “WARNING” legend will illuminate and the displayed PO2 value
will flash.
WARNING INDICATIONS: Failure to observe visual warnings and take
corrective action may 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.
•
If the diver descends below the user set Depth Alarm, the Depth
digits will flash. The Depth alarm is not active in the
Decompression Mode to avoid confusion with the “Shallower Than
Ceiling” alarm.
7
TOUCH CONTACT PROGRAMMING SCREENS: The following are all of
the screens that the Fathom-55 is capable of presenting in the Touch
Programming Mode. Refer to the particular configuration for appropriate
screens.
CENTRAL NERVOUS SYSTEM (CNS) TOXICITY: By the accepted
definition of CNS toxicity, should a PO2 value of greater than 1.6 ATA be
measured; the CNS Toxicity will be 100%. During the Surface Interval,
this percentage will decrease as the CNS declines toward zero.
Whatever the current CNS Toxicity level, it can also be viewed on the
Surface Interval Alternate Screen or on the InFormation screen in the
Programming Mode.
®
The user via the Analyst can set the CNS Toxicity alarm to any level
between 40% and 80% of the maximum allowable limit. As shipped from
the factory, this is set to 50%. Should the CNS Toxicity reach 50% of the
maximum allowable, the “WARNING” legend will illuminate and on the
Alternate Screen the displayed CNS percentage will be flashing along
with the “WARNING” legend.
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 Fathom-55 will track OTU based on Dr. Bill Hamilton’s ‘REPEX’
method of oxygen exposure management. The OTU Dose is an
exponential function of oxygen partial pressure and time. The timedependent limit varies with length of time (days) that the diver continues
to dive without full recovery to zero OTU. The Mission OTU Clock tracks
the OTU, which is a running clock that tracks long-term Oxygen
exposure. This clock may run for several weeks if frequent dives are
made using high levels of PO2. The recovery portion of the OTU
algorithm is a linear reduction of OTU over time. The Mission OTU clock
is reset to 0:00 when the OTU Dose reaches zero. Symptoms of
Pulmonary Oxygen Toxicity include burning in the throat and chest,
coughing, and shortness of breath. Discontinue diving and consult a
Physician should any of these, or other, symptoms appear.
DATA STORAGE TYPES & CAPACITY: The Fathom-55 has the
following internal distinct data storage activities that can be recalled,
®
viewed, and stored with the Analyst PC computer interface:
•
Current Variable Information: Local Time, CNS toxicity, OTU
Toxicity, Altitude, Battery voltage, Current unit Temperature, 14
tissues loading, and Time to Fly.
•
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, Decompression Time, Maximum
Depth and Ceiling, Maximum Depth and Ceiling Dive Number.
•
Each Dive Beginning Statistics: 14 tissues loading, Local Time
Clock, Dive of Day, Dive Number, Surface Time, CNS Toxicity, OTU
Dose, OTU Mission Clock, Altitude, Time to Fly, Battery Voltage.
Capacity is the most recent 256 dives.
•
Each Dive Ending Statistics: 14 tissues loading, Bottom Time,
Max Depth, Average Depth, Min NDC Time, Max Deco Time, Max
Deco Ceiling, Missed Ceiling, Missed Deco Time, CNS Toxicity,
OTU Dose, OTU Mission Clock, Max PO2, Max Ascent Rate, Max
A/R Time, Max A/R Depth, Min Temperature, Average Temperature,
Maximum Temperature, Min Battery Voltage, Time to Fly, number of
Warnings. Capacity is the most recent 256 dives.
•
Each Dive Configuration Data: Full and complete configuration of
the system, including Blend #1 Oxygen %, User Conservatism.
Capacity is the most recent 256 dives.
•
Profile Graphical Information: Depth Graph, Ascent Rate Graph,
Temperature Graph, PO2 Graph, O2 % Graph, CNS Graph and OTU
Graph. Capacity is 80 hours at four second sampling (dependent
upon memory configuration).
•
Inter-Dive Events: Number of Initializations, Unit Activation,
Altitude Changes of 500 Feet, Temperature Changes of 10 degrees,
®
Low Batteries, Sensor Malfunction, Analyst interface with Dive
Computer.
The current Mission Clock, CNS, and OTU values can be seen via the
®
Analyst PC interface or the current CNS and OTU values can be viewed
on the Alternate Screen while in the Surface Interval, Dive Mode,
Decompression Mode or Post Dive Interval. The current CNS and OTU
values can also be viewed via the Touch Contact Programming mode by
®
selecting the InFormation option. The user via the Analyst can set the
OTU Toxicity alarm to any level between 40% and 80% of the maximum
allowable limit. As shipped from the factory, this is set to 50%. Should
the OTU Dose reach 50% of the maximum allowable, the “WARNING”
legend will illuminate and on the Alternate Screen the displayed OTU
value will be flashing along with the “WARNING” legend.
Figure 38 shows a CNS exposure over the alarm set point (50%), in the
situation were both the CNS and the OTU exposure was over their set
points both values would flash.
8
INTER-DIVE EVENTS: The Fathom-55 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”. Some Inter-Dive
events are:
•
Initialization of the unit.
•
The unit is turned on
•
Low batteries
•
Altitude Changes of over 500 feet
•
Temperature Changes of 10 degrees
•
Sensor Malfunction
®
•
Analyst P.C. Communication
Water Temperature on page 60 for a detailed description of this function.
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 given day at any diving location as
explained in the “ALTITUDE ACCLIMATIZATION” on page 12. With
changes in barometric pressure due to temperature and weather
systems, it is possible, even expected, to 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 schedule, 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, altitudes 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 16,000
feet.
USER CONFIGURABLE ITEMS: The number of and which configurable
options are viewed is determined by the Fathom-55’s configuration.
Caution: Items that can be changed via Touch Contact Programming
may be different from their factory settings.
®
By using the optional Analyst Personal Computer Interface, the user has
the ability to change the following items:
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.
From the factory this is set to 4.
Dive Time/date Stamp: This is the internal clock setting 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 your local time via the Analyst .
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’.
Metric or Imperial: The diver may select whether the data is computed
and displayed in Metric or Imperial units. The Fathom-55 may be
ordered either way as shipped from the factory.
Select Nitrox Computations (Off or On): This option enables and
disables NITROX computations. If this option is disabled, mixtures other
than 21.0% oxygen will be disallowed. Furthermore, if this option is
selected as OFF, the Fathom-55 will not compute CNS Toxicity, OTU
Dose, or maximum PO2 alarm. The factory setting for this option is ‘On’.
®
This option can only be set via the Dealer Edition of the Analyst .
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.
From the factory this set to ‘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 of 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 ASCENT RATE
60 feet and deeper
60 feet per minute
60 to 30 feet
same as depth
Shallower than 30 feet
30 feet per minute
Enter Normal Blend Oxygen % in FO2 Nitrox Mixture (21 to 50): For
Constant FO2 mode, this option allows the user to enter the desired
Oxygen percentage for the FO2 Blend in 1% increments. Values from
21% to 50% may be entered. This option may also be set via the Touch
Contact Programming method. The factory setting is 21%.
High PO2 Alarm Point (0.50 to 1.59): This option allows the diver to
select a maximum PO2 (Partial Pressure of Oxygen) at which an alarm is
issued. Values from 0.50 to 1.59 are allowed. This is set to a PO2 of
1.40 at the factory before shipping.
Selectable NDC Conservatism (0% to 15%): This feature allows the
diver to input an added degree of conservatism to the decompression
algorithm from 0 to 15 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%’ from the factory.
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 be issued.
Ascent Rate Responsiveness (0 to 7): This option determines the
responsiveness or sensitivity 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
High CNS Alarm Point (40% to 80%): This option allows the diver to
select a maximum CNS (Central Nervous System) exposure at which an
alarm is issued. Values from 40% to 80% are allowed. This is set to
50% at the factory before shipping.
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
High OTU Alarm Point (40% to 80%): This option allows the diver to
select a maximum OTU (Oxygen Tolerance Units) exposure at which an
alarm is sounded. Values from 40% to 80% are allowed. This is set to
50% at the factory before shipping.
Max Depth Alarm: This option allows the diver to select a maximum
depth below, which the diver does not wish to exceed before an alarm is
issued; 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.
Confined Water Protocol (Training Mode) - (Enabled or Disabled):
This option enables the Training Mode for the Fathom-55. In this mode
the Fathom-55 will enter the Dive Mode at 2 feet instead of 5 feet and
exit the Dive Mode at 1 foot instead of 3 feet. The Training Mode also
permits the selection of an increased Post Dive Interval period from 10 to
30 minutes in one-minute increments. These changes permit the
Instructor to record a complete training session, including in-water
surface periods, as a single dive. As shipped from the factory, this is set
to ‘Disabled’. This option can only be ‘Enabled’ via the Professional
®
Edition of the Analyst .
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’.
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 Interval 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 option can only be set via the Professional Edition of the
®
Analyst .
Temperature Dependent NDC Computations (Normal or Reduced):
This feature compensates the decompression algorithm proportional to
the ambient water temperature. See User & Environmental Adaptation,
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 &
9
date can be set via Touch Contact Programming method. As shipped
from the factory, this is set to “OFF”.
Enter Clock Time: This allows the diver to set the dive computer clock’s
time & date to that of the P.C.
Restore Original Configuration Settings: This allows the diver to
restore the original factory default settings with a single command.
SPECIFICATIONS:
Algorithm
Fathom-55 a 14 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
16,000 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 48 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 256 Dives
Dive Profile Storage
up to 80 Dive hours at four second sampling
depending on configuration
Profile Sampling
4 second increment
Typical Battery Life*
Over 2000 dive hours under normal diving
conditions or 2 years (whichever is first)
With Clock Mode on, Battery Life is over 1000
dive hours or one year.
FIGURE 42
6.
7.
8.
ASSISTANCE, REPAIR & MAINTENANCE: The H2Odyssey Fathom55 does not require an Annual Maintenance, but if you suspect that your
Fathom-55 is not operating correctly, please contact our Customer
Support Department in the USA for assistance at 1-800-999-0019 or FAX
the details to 760-599-4096 or E-mail them to service@h2odyssey.com.
Most problems can be resolved without returning the unit. The unit may
also be returned to the place of purchase and the dealer requested 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 H2Odyssey Authorized
Dealer.
•
•
•
* 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 Fathom-55 is capable of having its’ capabilities
enhanced. It can be upgraded to a Nitrox computer. The Dive Profile
Storage memory capacity can be upgraded from a base of 80 hours to
720 hours.
P/N 19931
P/N 18971
P/N 15940
®
ANALYST Personal Computer Interface
®
The ANALYST V4.XX Personal Computer Interface is a complete
hardware/software system that uploads data from the Cochran Fathom®
55 to an IBM or compatible Personal Computer with a Windows
®
95/98/NT/ME/2000 & XP 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 database.
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 Alternate Screen in the Surface Interval or 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 for
maximum battery life. At this time, Eveready Energizer Alkaline is
recommended. 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 two years
regardless of battery condition.
CAUTION!!! IT IS HIGHLY RECOMMENDED THAT THE BATTERIES
ARE CHANGED AFTER THE TIME TO FLY IS ZERO. CHANGING THE
BATTERIES WILL CAUSE A COMPLETE LOSS OF ALL PREVIOUS
DIVE NITROGEN LOADING. THIS WILL AFFECT NITROGEN
CALCULATIONS ON NEAR-FUTURE DIVES. AFTER A BATTERY
CHANGE THE DIVE-OF-DAY NUMBER GOING TO ZERO
IMMEDIATELY AFTER CHANGING BATTERIES IS AN INDICATION OF
A LOSS OF NITROGEN LOADING.
To replace the batteries in the Fathom-55:
5.
NEVER TEST OR SUBJECT THE PRODUCT TO PRESSURIZED
AIR! (Voids Warranty)
ONLY USE FRESH WATER TO CLEAN UNIT!
NEVER USE SOLVENTS!
DO NOT USE A SCREWDRIVER TO REMOVE BATTERIES!
(Voids Warranty)
ALWAYS KEEP FRESH ENERGIZER® BRAND BATTERIES
INSTALLED!
LUBRICATE BATTERY ENDS WITH THIN FILM OF SILICONE
GREASE!
REPLACEMENT PARTS:
'N' Cell Alkaline Batteries (2)
Base O-ring - Parker 2-033
Retractor Only
CLEANING THE Fathom-55: 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.
1.
2.
3.
4.
Ensure there is no dirt or debris on the O-rings or the mating surface
and that the O-rings are properly installed.
Replace the bottom of the Fathom-55 on the main unit ensuring that
the index tab on the base is fitted to the index slot of the lens.
Carefully align the threads and screw the outer ring on hand tight.
Remove the unit from its boot.
Make certain the case is dry.
Unscrew and remove the outer base ring.
Separate the bottom of the Fathom-55 from the case assembly.
Extreme care should be taken to avoid damaging the wiring
cable, which connects the battery contacts and the depth
sensor to the electronics in the main unit.
Install replacement batteries in the orientation shown in figure 40.
10
FCC LABEL
This device has been tested and verified to comply with Part 15,
Class B, 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.
intended scope of this Limited Warranty are not covered. This Limited
Warranty does NOT cover plastics, O-rings, batteries, battery life, and
flooded battery compartments.
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.
The OWNER is responsible for shipping this Product to H2ODYSSEY for
service, and paying all associated costs, including shipping, insurance,
and import duties. OWNER may take Product to an Authorized Dealer to
arrange service under terms of this Limited Warranty. H2ODYSSEY 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 Warranty must be accompanied by a photocopy of the
original sales receipt in order for warranty repair or replacement to be
performed if the Warranty Registration Card is not on file.
INTERFERENCE STATEMENT: NOTE: This equipment has been tested
and found to comply with the limits for a Class B digital device. 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 interference 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.
STATEMENT of LIMITED LIABILITY: A mathematical model is used by
this Product to calculate physiological effects of SCUBA diving 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 individuals engaged in SCUBA diving,
H2ODYSSEY DOES NOT GUARANTEE THAT USE OF THIS
PRODUCT WILL PREVENT DECOMPRESSION SICKNESS OR ANY
OTHER CONDITION OR INJURY INCURRED WHILE USING THIS
PRODUCT.
MODIFICATIONS: Changes or modifications not expressly approved by
Cochran Consulting, Inc. could void the user's authority to operate the
equipment.
SHIELDED CABLES: This product is designed to be used only with the
®
Analyst interface cable (USB or RS-232) to maintain compliance with
FCC Regulations.
These influencing variables may include, 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.
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.
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 ALL 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. H2ODYSSEY and its
distributors and retailers will not be held liable for any personal injuries or
other damages resulting from its use, even if H2ODYSSEY has been
advised of such occurrences or damages.
®
All specifications are subject to change without prior notice. Analyst is a
registered trademark of Cochran Consulting, Inc. Energizer is a registered
trademark of the Eveready Battery Co., St. Louis MO. Copyright 2005
Cochran Consulting, Inc.
CE: 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 directives.
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 designed and tested to comply with
this standard draft.
These products must be handled with care and properly maintained to
assure the optimum performance. Users must possess the proper
training for SCUBA diving activities and should 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.
LIMITED WARRANTY: To the original purchaser ("OWNER") only,
H2ODYSSEY, represents this Product to be free of defects in materials
and workmanship under normal SCUBA use for 12 months from the date
of shipment from H2ODYSSEY to the Authorized Dealer or Distributor.
For purposes of establishing warranty eligibility, this date of shipment
can be determined by contacting H2ODYSSEY.
H2ODYSSEY strongly supports and agrees with maximum depth limits of
40 meters for recreational SCUBA diving, as established by recognized
training and certification agencies, and in no way encourages diving
beyond these or any prudent lesser limits as may be necessitated by
environmental, diver-specific, or other conditions.
Any defective Product, unless cause is specifically excluded in the
"Warranty Conditions and Limitations" section below, will at the sole
discretion of H2ODYSSEY, be repaired or replaced with a new or
refurbished unit of comparable or better function and/or condition.
H2ODYSSEY is not responsible for any incidental or secondary damages
as a result of Product malfunction.
THE WARRANTY AND REMEDIES 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
WARRANTIES, INCLUDING, WITHOUT LIMITATION, WARRANTIES
OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE.
WARRANTY CONDITIONS and LIMITATIONS: Product must have been
obtained from a H2ODYSSEY Authorized Dealer. Contact H2ODYSSEY
for verification of dealer status. This Limited Warranty is not transferable.
No H2Odyssey dealer, agent, or employee is authorized to make any
modification, extension, or addition to this warranty.
Failure to provide proper care for this 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 or other parameters, extreme heat or
cold, or other conditions which H2ODYSSEY may deem to be outside the
11
USER & ENVIRONMENTAL ADAPTATION: The Fathom-55 is one of
the new breed of Dive Computers that adapts its algorithm to the users
diving environment and style as originally pioneered by COCHRAN. All
of COCHRAN’s newer dive computers incorporate this capability. The
factors that are used for this “Adaptation” in the Fathom-55 are:
Water Temperature
Microbubble
User Conservatism
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.
Salt/Fresh Water Compensation
Altitude Acclimatization
In SEAMLESS, the algorithm is adjusted for extremely small changes in
altitude. However, a difference in 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 compensation algorithm, but normal variations in
atmospheric barometric pressure may affect the no-decompression time
which is more predominantly seen in the Pre-dive Prediction forecast.
WATER TEMPERATURE: Diving in cold water can lead to a lower core
and skin temperature which can affect the gas exchange rate of the
body’s tissues. The Fathom-55 features two modes of Temperature
Compensation, Normal or Reduced. The Fathom-55 progressively
makes its algorithms more conservative 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 one-half 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 compensation factor
®
may be set to Reduced Mode at the divers’ discretion via the Analyst
Personal Computer Interface.
CAUTION: The Fathom-55 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 Fathom-55 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
Fathom-55 should not be used for this type of diving by anyone
without this important training.
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 bubble formation. The Fathom-55
comprehends and adjusts for this phenomenon.
METRIC/IMPERIAL MODES: If the Fathom-55 is computing and
o
displaying in Metric, the “TEMP” C 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 dive computer.
USER CONSERVATISM: Current dive computers cannot tell if the diver
is dehydrated, tired, smokes, overweight, or has some other physical
issue that may require additional conservatism in the nitrogen algorithm.
The Fathom-55 allows the diver to input an added degree of
conservatism to the nitrogen algorithm from 0 to 15 percent in onepercent increments. This can be done via the Touch Contact
®
Programming Mode or with the Analyst Personal Computer Interface.
LOW BATTERY INDICATIONS: Fresh ENERGIZER® brand alkaline
batteries should read about 3.2 volts on the Alternate Screen and/or 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 dives might still remain possible.
When the battery voltage decays to 1.8 volts, the “BATT” legend will
begin to flash on and off. 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 installed. After the
computer automatically turns itself 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 for details on how to change
batteries.
SALT/FRESH WATER COMPENSATION (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 Fathom-55, 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, springs, and lakes.
CAUTION!!! COMPLETE LOSS OF BATTERY POWER MAY CAUSE
ALL PREVIOUS DIVE NITROGEN LOADING TO BE LOST. THIS WILL
AFFECT NITROGEN CALCULATIONS ON NEAR-FUTURE DIVES.
AFTER A BATTERY CHANGE, CONFIRM THAT NODECOMPRESSION TIME DATA IS REASONABLE IN 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.
ALTITUDE ACCLIMATIZATION: Driving or flying to a dive site
significantly higher in altitude requires special modifications to the "sea
level" algorithm. The Fathom-55 regularly samples the ambient
barometric pressure to determine these changes in altitude whether the
unit is On or Off. Accordingly, the decompression algorithm is changed
to reflect these barometric pressure changes. Note that temperature and
weather systems also affect barometric 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 ten minutes 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 Fathom-55 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.
In ZONE all altitudes less than 2,000 feet above sea level use the sealevel algorithm. At altitudes greater than this, altitude compensation is
“seamless”; literally, every small fraction of gained altitude is considered
in adjusting the algorithm. ZONE will reduce the occurrences of obtaining
slightly different altitude readings and corresponding no-decompression
(NDC) limits when diving within a given area. However, ZONE reduces
12
TABLE OF CONTENTS
FIGURES INDEX
Page Number
Product Introduction
Side Touch Contacts
Turning the Product On & Off
Main Operating Modes
Surface Interval
Dive Mode
Ascent Rate Bar Graph
Decompression Mode
Post Dive Interval Mode
Confined Water Protocol (Training mode)
BACLITE
Touch Contact Programming
Clock Programming
Clock Programming Procedure
Clock Programming Screens
Touch Programming Procedures
Programming Menus
Pre Dive Prediction
Information Display
Depth Alarm
Conservatism
Blend #1 O2 %
Logbook Mode
Logbook Screens
Warning Indications
Sensor Warning Mode
Sensor Warning Screen
Oxygen Toxicity Factors
Partial Pressure of Oxygen (PO2)
Central Nervous System Toxicity
Touch Programming Screens
Data Storage Types & Capacity
Inter-Dive Events
User Configurable Options
Product Specifications
Enhancements
Cleaning the Unit
Changing Batteries
Assistance, Repair, & Maintenance
Replacement Parts
®
Analyst Personal Computer Interface
Product Certifications
Limited Warranty and Liability Statement
User & Environmental Adaptation
Low Battery Indications
Table of Contents
Figures Index
Fig #
1
1
1
1
1
2
3
3
4
4
10
4
4
4
5
5
5
5
6
6
6
6
6
6
7
7
7
7
7
8
8
8
10
10
11
11
11
11
11
11
11
12
12
13
13
14
14
1
2
3
3a
4
Page Number
Self-Test Screen
1
Surface Interval - Primary Screen - No Nitrogen
1
Surface Interval - Alternate Screen - No Nitrogen - Time 1
Surface Interval - Alternate Screen - No Nitrogen - OTU 1
Surface Interval - Primary Screen - With Nitrogen
Showing Surface Time
2
4a Surface Interval - Primary Screen - With Nitrogen
Showing Bottom Time
2
5 Surface Interval - Alternate Screen - With Nitrogen
Showing OTU
2&4
5a Surface Interval - Alternate Screen - With Nitrogen
Showing Current Time
2
6 Dive Mode - Primary Screen
2
7 Dive Mode - Alternate Screen
2
11aAscent Bar Graph
3
8 Deco Mode - Primary Screen - Showing Total Time
3
8a Deco Mode - Primary Screen - At Zero Depth
4
9 Deco Mode - Alternate Screen – Showing OTU
3
9a Deco Mode - Alternate Screen – Showing Current Time 3
10 Post Dive Interval - Primary Screen
4
12 Programming Mode - PreDive Prediction Menu
8
13 Programming Mode - PreDive Prediction
5
14 Programming Mode - Information Menu
8
15 Programming Mode - Information Display
6
16 Programming Mode - Depth Alarm Menu
8
17 Programming Mode - Setting Depth Alarm
6
18 Programming Mode - Conservatism Menu
8
19 Programming Mode - Setting Conservatism
6
8
20 Programming Mode - O2 Menu
6
21 Programming Mode - Setting O2
24 Programming Mode - Logbook - Menu
8
25 Programming Mode - Logbook Mode
6
26 Programming Mode - Logbook - Showing Date & Time 6
27 Logbook Mode - Primary Screen - Normal Dive
7
28 Logbook Mode - Alternate Screen - Normal Dive
7
29 Logbook Mode - Primary Screen - Deco Dive
7
29aLogbook Mode - Alternate Screen - Deco Dive
7
30 Programming Mode - Clock Menu
5
31 Programming Mode - Clock Mode - Setting Date
5
32 Programming Mode - Clock Menu - Setting Month
5
33 Programming Mode - Clock Menu - Setting Time
5
34 Programming Mode - Clock Menu - Setting Day
5
8
35 Dive Mode - PO2 Warning Display
37 Altitude Bar Graph
2
38 Dive Mode - CNS / OTU Warning
8
39 Sensor Warning - Showing Temperature Sensor
7
40 Programming Mode - Clock Mode - Showing Time
5
41 Programming Mode - Clock Setting Year
5
42 Battery Orientation
10
13
H2Odyssey
Fathom-55
Owner's Manual
English - Imperial
Ver: Fathom55i.100
H2Odyssey
975 Park Center Dr
Vista, CA 92081
Toll-Free: (800) 999-0019
Telephone: (760) 599-4097
Fax: (760) 599-4096
www.h2odyssey.com
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