Sherwood Amphos User guide

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Page 1

AMPHOS DC MANUAL

AMPHOS

DIVE COMPUTER MANUAL

Page 2

AMPHOS DC MANUAL

NOTICES, WARRANTY, MODEL ......................................................... 3

GLOSSARY...........................................................................................4

DISPLAY ICONS, ABBREVIATIONS & TERMS .................................. 5

FEATURES & DISPLAYS ..................................................................... 6

CONTROL BUTTONS ......................................................................7

OPERATING MODE STRUCTURE .................................................. 7

OPERATION AS A DIVE COMPUTER ............................................. 7

AUDIBLE ALARM .............................................................................7

BACKLIGHT .....................................................................................8

POWER SUPPLY .............................................................................. 8

WATCH FEATURES & DISPLAYS .......................................................9

LOCAL DEFAULT TIME .................................................................10

MAIN TIME ...................................................................................... 10

WATCH ALT .................................................................................... 10

SET MAIN TIME .............................................................................. 10

Set Date Format .........................................................................10

Set Hour Format ........................................................................10

Set Time...................................................................................... 11

Set Date ...................................................................................... 11

ALTERNATE TIME .......................................................................... 11

Set Alternate Time ..................................................................... 11

WATCH CDT (COUNTDOWN TIMER) STATUS............................. 11

Set CDT ......................................................................................12

CHRONOGRAPH STATUS ............................................................. 12

DAILY ALARM STATUS .................................................................12

Set Daily Alarm .......................................................................... 12

DIVE COMPUTER FEATURES & DISPLAYS .................................... 13

BAR GRAPHS ................................................................................14

ALPHA/NUMERIC DISPLAYS ........................................................14

DIVE COMPUTER SURFACE MODES ..............................................15

OPERATING MODES .....................................................................16

SURFACE MODE ...........................................................................16

NORM SURF MAIN.........................................................................16

NORM SURF ALT 1 ........................................................................16

NORM SURF ALT 2 ........................................................................16

NORM/GAUG SET MODES............................................................17

Setting FO2 for Nitrox Dives ....................................................17

FO2 Set for Air ........................................................................... 17

SET F GROUP (FO2) ...................................................................... 17

Set FO2 Gas 1 ............................................................................ 17

Set FO2 Gas 2 ............................................................................ 17

Set FO2 50% Default .................................................................18

SET A GROUP (ALARMS) .............................................................18

Set Audible Alarm ......................................................................18

Set Depth Alarm .........................................................................18

Set EDT Alarm ............................................................................18

Set NIBG Alarm .......................................................................... 19

Set DTR Alarm ...........................................................................19

Set PO2 Alarm ............................................................................19

SET U GROUP (UTILITIES) ...........................................................19

Set Wet Activation .....................................................................19

Set Units .....................................................................................19

Set NORM Deep Stop ................................................................ 20

Set NORM Safety Stop .............................................................. 20

Set Conservative Factor (CF) ................................................... 20

Set Backlight Duration ..............................................................20

Set Sampling Rate .....................................................................20

SERIAL NUMBER ...........................................................................21

NORM PLAN MODE .......................................................................21

FLY MODE ......................................................................................21

DESAT MODE .................................................................................22

NORM/GAUG LOG MODE ............................................................. 22

HISTORY MODE ............................................................................. 23

NORM DIVE MODES ..........................................................................24

DIVE TIME REMAINING (DTR) ...................................................... 25

No Deco Time Remaining (NDC) ..............................................25

O2 Time Remaining (OTR) ........................................................25

ASCENT RATE INDICATOR (ASC)................................................25

NORM NO DECOMPRESSION DIVE MODE .................................25

NORM NO DECO MAIN..................................................................25

NORM NO DECO ALTS ..................................................................25

NO DECO DEEP STOP .................................................................. 26

NO DECO SAFETY STOP .............................................................. 26

CAUTIONARY MODES .......................................................................27

DECOMPRESSION ........................................................................28

CONDITIONAL VIOLATION (CV) ................................................... 28

DELAYED VIOLATION 1 (DV1) ......................................................29

DELAYED VIOLATION 2 (DV2) ......................................................29

DELAYED VIOLATION 3 (DV3) ......................................................29

VIOLATION GAUGE MODE (VGM) ................................................30

HIGH PO2 .......................................................................................30

HIGH O2 .......................................................................................... 31

SWITCHING GAS MIXES ...................................................................32

SWITCHING (NORM)......................................................................33

GAUGE OPERATING MODE ............................................................. 34

SURF MAIN.....................................................................................35

SURF ALT .......................................................................................35

DIVE MAIN ......................................................................................35

DIVE ALT ........................................................................................ 35

DELAYED VIOLATION 3 (DV3) ......................................................35

FREE DIVE OPERATING MODE ........................................................36

SURF MAIN.....................................................................................37

SURF ALT 1 ....................................................................................37

SURF ALT 2 ....................................................................................37

FREE CDT (COUNTDOWN TIMER) ............................................... 37

FREE ELAPSED DIVE TIME (EDT) Alarm .................................... 38

FREE DEPTH ALARMS (DA) ......................................................... 38

FREE DIVE MAIN AND ALTS ......................................................... 38

FREE DIVE ALARMS ..................................................................... 39

REFERENCE ......................................................................................41

CARE AND CLEANING .................................................................. 42

INSPECTIONS AND SERVICE .......................................................42

BATTERY REPLACEMENT ............................................................ 42

ALTITUDE SENSING AND ADJUSTMENT .................................... 43

UPLOADING SETTINGS AND DOWNLOADING DATA ................ 43

ERROR (RESET DURING A DIVE) ................................................44

SPECIFICATIONS ...........................................................................45

INSPECTION/SERVICE RECORD ..................................................... 49

CONTENTS

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AMPHOS DC MANUAL

LIMITED TWO-YEAR WARRANTY

Sherwood Scuba guarantees, to the original purchaser only, that the AMPHOS will be free of defects in materials and/or craftsmanship under normal recreational multilevel scuba use for two years from date of purchase, provided proper care and annual service are performed as described within this owner’s guide. Should your AMPHOS prove to be defective for any reason (other than those listed in the limitations section below) it will be repaired or replaced (at Sherwood Scuba's discretion) free of charge excluding shipping and handling charges.

This warranty will be considered void if the computer is not registered online at SherwoodScuba.com within 30 days of the purchase date, and if the annual inspection is not done according to this owner’s manual. This warranty is not transferable and applies to the original purchaser only. All correspondence concerning this warranty must be accompanied by a copy of the original sales receipt and the serial number of the device submitted for warranty coverage.

Once each year you must return the AMPHOS to an Authorized Sherwood Dealer within 30 days of the original purchase date anniversary to keep the two year limited warranty in force. Annual inspection includes verication of depth accuracy and proper general function. Labor charges for

the annual inspection are not covered by the warranty. You must provide a copy of the original sales receipt and a copy of the owner’s portion of the warranty registration card including the annual service record to obtain warranty service.

STATEMENT OF LIMITATIONS - GENERAL: Warranty does not cover damage from accident, abuse, battery leakage, tampering, lack of proper care and maintenance and/or proper annual servicing, or improper use of the AMPHOS. Modications or repair by anyone other than a Sherwood Sales and Service Center authorized to service

the AMPHOS will void the warranty. Sherwood Scuba will not be responsible for recovery or replacement of the product in the event of loss or theft. Sherwood Scuba, its distributors, and retailers make no warranties, either expressed or implied, with respect to this product or its owner’s manual except those stated in the preceding paragraphs. In consideration of the sale of the AMPHOS to you, you agree and understand that in no event will Sherwood

Scuba, its distributors or retailers, be held liable for any personal injuries resulting from its operation, or for any other damages whether direct, indirect, incidental, or consequential even if Sherwood Scuba is advised of such damages.

Some states do not allow the exclusion or limitation of implied warranties or liabilities for incidental or consequential damages, so the above limitation may not apply to you.

Warranty does not extend to the plastic gauge face, o-rings, batteries, or damage due to accident, abuse, modication, or tampering.

This manual is copyrighted, all rights are reserved. It may not, in whole or in part, be copied, photocopied, reproduced, translated, or reduced to any electronic medium or machine readable form without prior consent in writing from Sherwood Scuba LLC / 2002 Design.

AMPHOS DC Manual, Doc. No. 12-5301

TRADEMARK NOTICE

Sherwood Scuba, the Sherwood Scuba logo, and HydroGlo are registered or unregistered trademarks of Sherwood Scuba LLC. AMPHOS and the AMPHOS logo are trademarks of Sherwood Scuba LLC. All rights are reserved.

PATENT NOTICE

U.S. Patents, registered in the U.S. Patent and Trademark Ofce, have been issued to protect the following design features: Data Sensing and Processing Device (U.S. Patent no. 4,882,678), Dive Time Remaining (U.S. Patent no. 4,586,136), and Ascent Rate Indicator (U.S. Patent no. 5,156,055).

DECOMPRESSION MODEL

The programs within the AMPHOS simulate the absorption of nitrogen into the body by using a mathematical model. This model is merely a way to apply a limited set of data to a large range of experiences. The AMPHOS dive computer model is based upon the latest research and experiments in decompression theory. Still, using the AMPHOS, just as using the U.S. Navy (or other) No Decompression Tables, is no guarantee of avoiding decompression sickness (i.e., the bends). Every diver’s physiology is different, and can even vary from day to day. No machine can predict how your body will react to a particular dive prole.

NOTICES

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AMPHOS DC MANUAL

Air Dive - A dive conducted using air (approximately 21% oxygen & 79% nitrogen) as the breathing gas.

Algorithm - A step-by-step mathematical formula designed to accomplish a particular result (i.e. Dive Time Remaining in the Wisdom 3).

Alternate Display - Additional information accessible by pressing a control button.

Altitude Dive - A dive made at an elevation above sea level (> 3,000 feet/915 meters) when no decompression limits are reduced .

Ascent Rate - The speed that a diver ascends toward the surface.

Ascent Rate Indicator - A display that shows ascent rate as a bar graph.

Audible Alarm - A computer emitted tone that alerts the diver to potential danger.

Battery Indicator - An icon displayed while in Surface Time/Wet Mode, indicates a Low Battery Condition.

Caution Zone - The sections of the Nitrogen Bar Graph , O2 Bar Graph, and Ascent Rate Indicator that give a visual warning of a diver’s proximity to

decompression limits, oxygen tolerance limits, and ascent rate, respectively.

Ceiling - See decompression ceiling.

Clean Dive - A dive preceded by 24 hours of no diving activity.

CNS - Abbreviation for the Central Nervous System of the body.

Competitive Dive - A dive conducted for prot or prize.

Compartment - A term applied to the hypothetical modeling of nitrogen absorption in the tissues (more accurate than the term “tissue” because dive com-

puter models have no direct relation to human tissues).

DCS - Abbreviation for decompression sickness, i.e., “the bends”.

DECO - Abbreviation for Decompression.

Decompression Ceiling - The shallowest depth a diver may reach upon ascent without risking decompression sickness.

Decompression Stop - The depth(s) at which a diver must pause during ascent to allow absorbed nitrogen to escape naturally from the tissues.

Deep Stop - A depth at which a diver may choose, but is not required, to pause during ascent to allow absorbed nitrogen to escape naturally from the tissues.

Depth Sensor - an electro-mechanical device that converts water pressure into an electrical signal, that is converted to a visual depth display.

Display - A visual readout of information.

Dive Log Mode - A computer display of previous dive information.

Dive Planner - A display of available dive times at 10 foot (3 meter) intervals from 30 to 190 feet. (9 to 57 meters) used when dive planning.

Dive Time Remaining - A display of the time before a diver must surface based on no decompression dive time remaining or O2 time remaining.

Elapsed Dive Time - Total time spent underwater during a dive between 5 feet (1.5 meters) on initial descent to 3 feet (1 meter) on nal ascent.

FO2 - The fraction (percent / 100) of oxygen (O2) in the breathing gas mixture.

Icon - a small pictorial representation of an operational mode

LCD - Abbreviation for liquid crystal display, an easily viewed low voltage display usually found on dive computers

Maximum Depth - The deepest depth attained during a dive.

Mode - A specic set of functions in a dive computer.

Multi-level Dive - A type of dive prole where the diver spends various times at different depths (opposite of a “Square Wave” dive prole).

Nitrogen Bar Graph - A graphic display of simulated nitrogen absorption on Sherwood dive computers.

Nitrox - A nitrogen-oxygen breathing gas mixture that contains a higher fraction of oxygen than air.

Nitrox Dive - A dive conducted using nitrox (22 to 50 % O2) as the breathing gas.

NOAA - Abbreviation for National Oceanic and Atmospheric Administration.

No Deco - Abbreviation for No Decompression.

No Deco Time Remaining (NDC) - The amount of dive time remaining based on no-decompression status.

No Decompression - Any part of a dive where the diver can surface without requiring a decompression stop.

O2 Bar Graph - A visual representation of oxygen accumulation on a dive computer display.

OTU - Abbreviation for oxygen tolerance unit. A Hamilton's Repex method term for oxygen dose.

Out of Range - The point at which a dive computer can no longer supply correct dive information.

Oxygen Tolerance - Dose or exposure to the physiological affects of elevated levels of oxygen.

Oxygen Toxicity - The adverse physiological affects of exposure to elevated levels of oxygen.

Partial Pressure - The proportion of the total pressure contributed by a single gas in a mixture of gases.

PO2 - Partial pressure of oxygen. The proportion of total pressure of a gas mixture contributed by oxygen.

Repetitive Dive - Any dive that takes place within 12 hours of a previous dive.

Safety Stop - A depth at which a diver may choose, but is not required, to pause during ascent to allow absorbed nitrogen to escape naturally from the tissues.

Square Wave Dive - A type of dive prole where the entire dive is spent at one depth between descent and ascent.

Tissue Compartment - See Compartment.

Transducer - An electro-mechanical device in a dive computer that acts as a depth or pressure sensor.

Transition Period - The rst 10 minutes of surface time after ascending above 3 feet (1 meter) from a dive.

GLOSSARY

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AMPHOS DC MANUAL

ABBREVIATIONS/TERMS

Activ = Activation ALRM = Alarm Alt = Alternate AMPH = Amphos ASC = Ascent Rate Indicator ATA = Atmospheres Absolute AUD = Audible AVAIL = Available BATT = Battery (bAtt) C = Centigrade (temperature) CDT = Countdown Timer CF = Conservative Factor CHRO = Chronograph CV = Conditional Violation D - M = Day - Month DA = Depth Alarm DC = Dive Computer DECO = Decompression DFLT = Default DSP = Deep Stop Preview DS = Deep Stop DSAT = Desaturation (time) DTR = Dive Time Remaining dur = Duration (backlight) DV = Delayed Violation EDT = Elapsed Dive Time EL = Elevation (altitude) ERR = Error F = Fahrenheit (temperature)

FO2 = Fraction of Oxygen (%) FPM = Feet Per Minute (ascent rate) FREE = Free Dive Mode FT = Feet (depth) GAUG = Digital Gauge Dive Mode (GAU) GLO = Glow (backlight) HR = Hour (Hr) HIST = History Lo = Low (battery) M = Meters (depth) M - D = Month - Day MAX = Maximum MIN = Minutes (min) MPM = Meters Per Minute (ascent rate) NDC = No Deco DTR NDL = No Deco Limit NIBG = Nitrogen Bar Graph NO-D = No Decompression NORM = Normal Dive Mode (Nor) O2 = Oxygen PC = Personal Computer PO2 = Partial Pressure of O2 (ATA) SAFE = Safety (stop) SEC = Seconds (sec) SN = Serial Number SURF = Surface tot = Total VGM = Violation Gauge Mode Vio = Violation (VIOL)

Daily

AL On

Low Batt

go Down

Time is No Deco

Surface Interval

Depth/Time

is for Stop

go Up

Time id

value is Max Depth

Gas #

value is PO2

Bar Graph id

value is FO2

Total Ascent Time

DISPLAY ICONS

Depth id

a Gas is Nitrox

Depth id

Temperature

Time value

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AMPHOS DC MANUAL

FEATURES

DISPLAYS

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AMPHOS DC MANUAL

OPERATING MODE STRUCTURE

Unless it is operating in Dive Computer mode, the AMPHOS will be On in the default Watch Main Time (home time) mode (Fig.

1), like a standard watch, until the mode is changed.

The M button is used to access 4 other Modes that include Alternate Time Mode, Countdown Timer, Chronograph (stop watch/ lap timer), and Daily Alarm. It is also used to revert to the Local Default Time display and access Computer Modes.

The screens of the Main Modes and Sub Modes will remain on display until a button is pressed to access another screen or Mode, activate a sequence, or for 2 minutes if no button is pressed. The Chronograph remains on display as long as it is running unless another Mode is accessed.

When Wet Activation is set On, the AMPHOS will enter the selected Dive Mode upon descent to 5 FT (feet)/1.5 M (meters) for 5 seconds, regardless of what operating mode it is in.

WARNING: When Wet Activation is set OFF, the AMPHOS must be in Dive Surface Mode (NORM, GAUG, or FREE) prior to the ﬁrst dive of a new series. Commencing a dive while in Watch modes will not activate Dive Mode unless Wet Activation is set ON.

OPERATION AS A DIVE COMPUTER

The AMPHOS features 3 Dive Computer (DC) Operating Modes, NORM (Fig. 2A) which is used for Air and Nitrox dives, GAUG (Fig. 2B) used for dives in which Nitrogen-Oxygen calculations are not performed, and FREE (Fig. 2C) used for breath hold activities that do not use SCUBA.

NORM and GAUG Modes allow access to Fly, Log, History, and Set Modes.

NORM Mode (only) allows access to Desat Mode.

FREE Mode has it's own group of settings. Shared features such as Backlight duration can be set by accessing NORM or GAUG.

AUDIBLE ALARM

Most warning situations that activate the Audible Alarm while operating in NORM or GAUG Mode will sound 1 beep per second for 10 seconds, or until the situation is corrected, or it is acknowledged by pressing and releasing the S button (less than 2 seconds). After being acknowledged and the situation corrected, the Alarm will sound again upon reentry into the warning situation, or entry into another type of warning situation.

FREE Dive Mode has its own set of Alarms which emit 3 beeps either 1 or 3 times which cannot be acknowledged or set Off.

The Audible will not be active if it is Set OFF (a group A setting).

Situations that will activate the NORM/GAUG 10 second Alarm include -

• Descent deeper than the Max Depth value selected.

• Dive Time Remaining decreases to the value selected.

• Elapsed Dive Time at the value selected.

• High PO2 increases to the value selected.

• O2 reaches 300 OTU (100% of allowed single or daily exposure).

• Nitrogen Bar Graph at the value (segment) selected.

• NORM/GAUG Ascent Rate Alarm - rate exceeds 60 FPM (18 MPM) when deeper than 60 FT (18 M), or 30 FPM (9 MPM) at 60 FT (18 M) and shallower.

• Entry into Decompression (NORM).

Fig. 1 - WATCH MAIN TIME

INTRODUCTION

Welcome to Sherwood and thank you for choosing the AMPHOS !

It is extremely important that you read this Owner's Manual in sequence and understand it completely before attempting to use the AMPHOS as a dive computer.

Remember that technology is no substitute for common sense, and a dive computer only provides the person using it with data, not the knowledge to use it.

CONTROL BUTTONS

The AMPHOS features 4 Control Buttons that allow you to select mode options and access speciﬁc information. They are also used to enter Settings, activate the Backlight, and acknowledge the Audible Alarm.

Throughout this manual they will be referred to as the M, S, L, and A buttons.

• Upper/Left - Mode (M) button

• Upper/Right - Select (S) button

• Lower/Right - Light (L) button

• Lower/Left - Advance (A) button

Fig. 2 - SURFACE MAINS

BUTTONS

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AMPHOS DC MANUAL

• Conditional Violation (above a required Deco Stop Depth for less than 5 minutes).

• Delayed Violation (above a required Deco Stop Depth for more than 5 minutes).

• Delayed Violation (a Deco Stop Depth greater than 60 FT/18 M is required).

• Delayed Violation (Maximum Operating Depth of 330 FT/100 M is exceeded).

• A Gas Switch to another tank would expose the diver to PO2 greater than 1.60 ATA.

• Watch Daily Alarm reaches time set (on surface only).

• Watch Countdown Timer reaches 0:00 (on surface only).

A single short beep (which cannot be disabled) is emitted for the following -

• Upon completion of a battery change.

• Change from Delayed to Full Violation 5 minutes after the dive.

3 short beeps (which cannot be disabled) are emitted for the following -

• NORM/GAUG Ascent Rate Warning - rate is 51 to 60 FPM (15.1 to 18 MPM) when deeper than 60 FT (18 M), or 26 to 30 FPM (7.5 to 9 MPM) at 60 FT (18 M) and shallower.

• FREE Dive Elapsed Dive Time Alarm - 3 beeps at each 30 second interval, if set On.

• FREE Dive Depth Alarms 1/2/3 (set sequentially deeper) - each 3 beeps 3 times.

• FREE Dive NIBG Alarm (Caution zone, 4 segments) - 3 beeps 3 times.

• Entry into Deco during a FREE Dive (Violation) - 3 beeps 3 times.

• Free Mode Countdown Timer reaches 0:00 - 3 beeps 3 times.

During the following NORM Dive situations, the 10 second continuous tone will be followed by a 5 second steady beep that cannot be acknowledged/silenced -

• Ascending above a required Decompression Stop Depth for more than 5 minutes (referred to as a Delayed Violation).

• Decompression requires a Stop Depth of 70 FT (21 M) or deeper.

• Being on the Surface for 5 minutes after a Conditional Violation.

BACKLIGHT

To activate the Backlight, press the L (lower/right) button.

• The Backlight will activate and illuminate the display for button depression time* plus the Duration time set (0, 5, or 10 seconds) for a maximum of 20 seconds.

*The Backlight turns Off if the button is held depressed for more than 10 seconds.

• Press L again to activate as desired.

NOTE: Extensive use of the Backlight reduces estimated Battery life. Also, the Backlight does not operate during a Low Battery condition or when the AMPHOS is connected to a PC.

POWER SUPPLY

The AMPHOS uses (1) 3 volt CR2430 Lithium Battery. Used as a Dive Computer, the battery should operate normally for 1 year or 300 dive hours if 2 dives are conducted during each dive period. Voltage is checked every 2 minutes on the surface.

• If voltage decreases to the Warning level (2.75 volts), the Battery icon will appear on Surface Main (Fig. 3a) as an indication that the Battery should be changed prior to commencing a series of dives.

• If the voltage decreases to the Alarm level (2.50 volts), the Battery icon will ﬂash and the message CHANGE BATT will ﬂash (Fig. 4) for 5 seconds, then operation will revert to Watch Main Time. The AMPHOS would then only operate in Watch modes until the Battery becomes completely depleted.

• Low Battery conditions are not displayed during dives.

• If a Low Battery Condition was not displayed prior to starting a Dive, and a Low Battery Condition occurs during the dive, there will be sufﬁcient Battery power remaining to maintain operation for the remainder of that dive.

Fig. 4 - LOW BATTERY

ALARM

Fig. 3 - LOW BATTERY

WARNING

• It should not be considered that the capabilities built into the AMPHOS provide an implied approval or consent from Sherwood for individuals to exceed the dened limits for recreational diving, as agreed on by all internationally recognized training agencies.

• The oxygen features of the AMPHOS are intended for use by recreational divers trained for Nitrox diving by an instructor certied by a recognized training agency to teach diving with Nitrox.

• Conducting repetitive dives using enriched nitrogen-oxygen mixtures can lead to oxygen buildup, reducing oxygen tolerance while increasing the risk of pulmonary oxygen toxicity.

• The AMPHOS provides information based upon a personal dive prole, and therefore must not be shared between divers. It is impossible for two divers to stay precisely together underwater, and your computer's dive prole tracking of previous dives will be pertinent to you only. Nitrogen and oxygen loading of a second user may be signicantly different and swapping dive computers could lead to inaccurate and dangerous predictions of decompression and oxygen accumulation status.

WARNINGS AND SAFETY RECOMMENDATIONS

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AMPHOS DC MANUAL

WATCH

FEATURES & DISPLAYS

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AMPHOS DC MANUAL

LOCAL DEFAULT TIME

Watch Main Time (Fig. 5) is the current Time at your home location and is normally selected as the Local Default Time.

The normal Watch screen sequence accessed with momentary presses (less than 2 seconds each) of the M button is -

Main Time >> Alternate Time >> Countdown Timer >> Chronograph >> Daily Alarm

Watch Alternate Time (Fig. 6), which is set by Hour Differential, is the current Time at a remote travel location. Upon arrival at the location, Alternate Time can be interchanged with Main Time to make it the Local Default Time.

While viewing Alternate Time, depressing the S button for 2 seconds will replace Main Time with Alternate Time that will then become the Local Default Time until changed.

While viewing any of the Watch Mode displays, depressing the M button for 2 seconds or if no button is pressed for 2 minutes, operation will revert to the Watch Default Time screen selected.

MAIN TIME, information displayed includes (Fig. 7):

> Daily Alarm icon (clock) if it is set On (Fig. 7a). > Time of Day (hr:min:sec) with P icon (if PM), no icon if AM or if 24 Hour Format. > Day of the Week graphic MON (or TUE, WED, THU, FRI, SAT, SUN). > Battery icon, if a Low Battery Condition exists. > Nitrogen Bar Graph, if any after NORM/FREE dives.

• M (< 2 sec) will access Watch ALT Time (remote, set for travel location).

• M (2 sec) will access Dive Computer Surface Mode (NORM, GAUG, or FREE).

• A (< 2 sec) will access NORM/GAUG Log and History Modes.

• A (2 sec) will access the ALT (Alternate) screen (Elev, Temp, Date).

• S (< 2 sec) will silence/acknowledge the Daily Alarm.

• L (press) will activate the Backlight.

• A + S (simultaneously 2 sec) will access the Set Time menu.

WATCH ALT, information includes (Fig. 8):

> Altitude graphic (EL2 to EL7), if above 3000 feet (915 meters), blank if Sea level. > Date (Month.Day or Day.Month). > Temperature with ° icon and graphic F (or C).

• After 5 seconds, operation will revert to the Watch Time screen.

• A (< 2 sec) will revert to the Watch Default Time screen.

• L (press) will activate the Backlight.

SET MAIN TIME This mode allows the Date and Time of Day to be set which will also serve as the basis for Watch Alternate Time values.

> Set items include Date Format, Hour Format, Time, and Date > Day of the Week is set automatically when the Date is set. > When the AMPHOS is operating in Dive Computer mode, Date is displayed only to identify dives when they are accessed in

the Log Mode

• A (repeatedly, < 2 sec each time) will step through the menu items.

• M (2 sec) at any time, or if no button is pressed during a period of 2 minutes, operation will revert to Watch Default Time.

Set Date Format

While viewing the Watch Default Time screen, depressing the A and S buttons simultaneously for 2 seconds will access the Set Date Format screen displaying the graphic SEt and the Set Point M - D (or D - M) ﬂashing (Fig. 9).

> M - D means that Month will be displayed to the left of Day. > D - M means that Day will be displayed to the left of Month.

• S (< 2 sec) will toggle between M - D and D - M.

• A (< 2 sec) will save the setting and access Set Hour Format.

Set Hour Format

The Set Hour Format screen displays the graphic SEt with the Set Point 12HR (or 24HR) ﬂashing (Fig. 10).

• S (< 2 sec) will toggle between 12 and 24.

• A (< 2 sec) will save the setting and access Set Time.

Fig. 5 - MAIN TIME

Fig. 6 - ALTERNATE TIME

Fig. 7 - MAIN TIME

(12 Hour Format)

Fig. 8 - WATCH ALT

Fig. 9 - SET DATE FORMAT

Fig. 10 - SET HOUR FORMAT

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AMPHOS DC MANUAL

Set Time

The Set Time screen displays the graphics SEt and TIME with the Time of Day (hr:min) with the Hour digits ﬂashing (Fig. 11). The graphic P is displayed when PM, no graphic if AM or 24 Hour Format.

• S (press/hold) will scroll upward through the Hour Set Points in 1 hour increments at a rate of 8 per second.

• S (< 2 sec) will step upward through the Set Points one at a time.

• A (< 2 sec) will save the Hour setting and ﬂash the Minute digits.

• S (press/hold) will scroll upward through the Minute Set Points in 1 minute increments at a rate of 8 per second.

• S (< 2 sec) will step upward through the Set Points one at a time.

• A (< 2 sec) will save the Minute Set Point and access Set Date.

Set Date

The Set Date screen displays the graphic SEt and Month.Day (or Day.Month) with the Year digits ﬂashing (Fig. 12).

• S (press/hold) will scroll upward through the Year Set Points in 1 Year increments at a rate of 8 per second from 2011 to 2054 (with leap year corrections).

• S (< 2 sec) will step upward through the Year Set Points one at a time.

• A (< 2 sec) will save the Year setting and ﬂash the Month digits (regardless of their position on the display).

• S (press/hold) will scroll upward through the Month Set Points in 1 month increments at a rate of 8 per second.

• S (< 2 sec) will step upward through the Month Set Points one at a time.

• A (< 2 sec) will save the Month Set Point and ﬂash the Day digits.

• S (hold) will scroll upward through the Day Set Points in 1 Day increments at a rate of 8 per second.

• S (repeatedly, < 2 sec each time) will step upward through the Day Set Points one at a time.

• A (< 2 sec) will save the Date setting and revert to Watch Default Time.

> Year will not be displayed in any mode other than Set Date. > Main Time/Date can also be set using the PC Interface program. > Prior to shipment from the factory, any error of the Main Time is corrected.

ALTERNATE TIME, information includes (Fig. 13):

> Alarm icon, if the Daily Alarm is set On, blank if Off. > Graphic ALt, indicating Time as Alternate (remote location). > Time of Day (hr:min:sec), blank if Off. > Day of the Week graphic MON (or TUE, WED, THU, FRI, SAT, SUN), or OFF.

• S (< 2 sec) will silence/acknowledge the Daily Alarm.

• S (2 sec) will interchange ALT Time with Main Time making ALT Time the local Watch Default Time screen.

• A + S (2 sec) will access Set ALT Time.

• M (< 2 sec) will access the Watch CDT Status (Countdown Timer).

• M (2 sec) will revert to the Watch Default Time screen.

• L (press) will activate the Backlight.

Set Alternate Time

• ALT TIME can be set OFF, or to an Hour Differential ranging from + 1 through +23 through - 23 through -1 (hours).

• Once the Differential is selected and saved, values of ALT Time will be based upon the Main Time setting.

Information includes (Fig. 14):

> Graphics SEt and ALt. > Graphic OFF (or numeric value) ﬂashing.

• S (press/hold) will scroll through the Set Points in increments of 1 Hour at a rate of 8 per second.

• S (< 2 sec) will step upward through the Set Points one at a time.

• A (< 2 sec) will save the Set Point and revert to the Watch ALT Time screen.

• M (2 sec) will revert to the Watch Default Time screen.

• If no button is pressed during a period of 2 minutes, operation will revert to the Watch Default Time screen.

WATCH CDT (COUNTDOWN TIMER) STATUS, information includes (Fig. 15, 16):

> Graphic OFF (or ON) ﬂashing, with 0:00 if no time was previously set, the remaining Countdown Time (hr:min) if running,

or the Countdown Time previously set.

> Graphic CDT.

• S (< 2 sec) will toggle between ON and OFF. A toggle to ON will Start the Timer if a Time has been set.

>> If OFF is selected, the CD Time in progress will stop counting down. Access to Set will be allowed.

>> If ON is selected, the CD Time displayed (time previously set, or the time remaining when stopped) will start counting

down. Access to Set will be blocked.

• A + S (2 sec) will display the graphic SEt in place of OFF, allowing the Time to be set.

• M (< 2 sec) will access Chrono.

• M (2 sec) will revert to the Watch Default Time screen.

• L (press) will activate the Backlight.

Once set ON, a CDT will run in the background (on surface) until turned OFF, or it counts down to 0:00 at which time the alarm will strike. Upon entry into Dive Mode the CDT will turn OFF with the Time reverting to the value previously set.

Fig. 11 - SET TIME

Fig. 12 - SET DATE

Fig. 13 - ALTERNATE TIME

Fig. 14 - SET ALTERNATE

TIME

Fig. 15 - CDT STATUS

(no time set)

Fig. 16 - CDT STATUS

(running)

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AMPHOS DC MANUAL

Fig. 17 - SET WATCH CDT

Fig. 20 - LAP RECALL

Fig. 18 - CHRONO STATUS

(not running)

Fig. 21 - DAILY ALARM

Fig. 22 - SET DAILY ALARM

Fig. 19 - CHRONO STATUS

(Lap in progress)

sec_.01 sec

hr:min

Set CDT, information includes (Fig. 17):

> Graphic SEt with last Time (hr:min) set, Hour digits ﬂashing. > Graphic CDT.

• S (press/hold) will scroll upward through the Hour Set Points in 1 hour increments at a rate of 8 per second.

• S (< 2 sec) will step upward through the Set Points one at a time.

• A (< 2 sec) will save the Hour setting and ﬂash the Minute digits.

• S (press/hold) will scroll upward through the Minute Set Points in 1 minute increments at a rate of 8 per second.

• S (< 2 sec) will step upward through the Set Points one at a time.

• A (< 2 sec) will save the Minutes setting and revert to the CDT Status screen with the graphic OFF ﬂashing in place of SEt.

• S (< 2 sec) will toggle from OFF to ON, starting countdown.

• M (2 sec), or no button press for 2 min, will revert to Watch Default Time.

CHRONOGRAPH STATUS (Stop Watch, Lap Timer), information includes (Fig. 18, 19):

> 0:00:00.00, or total elapsed run time (hr:min & sec. 1/100th sec) if previously started and running. > Graphic CHRO if not running, or LAP1 (2 to 9, the one in progress) if running.

• S (< 2 sec) will Start the Timer which will begin counting up from 0:00:00.00 to 9:59:59.99 (hr:min_ _sec.1/100th sec) in increments of .01 (1/100th sec).

During the ﬁrst 4 seconds the 1/100th second values will be displayed after which 2 dashes ( . - - ) will be displayed. The 1/100th values will be recorded and displayed when Laps are frozen and when later recalled.

• Subsequent presses of S (< 2 sec) will freeze Lap Times (LAP 1 through LAP 9). After 9 Laps are recorded, additional Laps will replace LAP 9, shift the others to lower LAP numbers, while discarding LAP 1.

If the Timer reaches 9:59:59.99, it will stop and save that as a LAP. Subsequent presses of S will then have no effect.

• A (< 2 sec) will Stop the Timer and Recall LAP 1, displaying the graphic LAP1 and Lap Time. Repeat presses will display other Laps (2 to 9).

• A (2 sec) will Stop the Timer and Reset the Time to 0:00:00.00.

• M (< 2 sec) will access Daily Alarm Status.

• M (2 sec), or no button press for 2 min, will revert to Watch Default Time.

While the Chrono is running, it will remain on the screen until a button operation is performed. If another screen is accessed, it will then continue to run in the background.

Upon descending on a dive, Chrono operation will be terminated and reset to 0:00:00.00.

DAILY ALARM STATUS, information includes (Fig. 21):

> Graphic ON (or OFF), ﬂashing. > Alarm Time last set (hr:min) with A (or P) icon. > Graphic ALRM and alarm icon.

• S (< 2 sec) will toggle between ON and OFF.

>> If OFF is selected, alarm activation is disabled. Access to Set will be allowed. >> If ON is selected, the alarm time set is enabled. Access to Set will be blocked.

• A + S (2 sec) will display the graphic SEt in place of OFF, allowing the Time to be set.

• M (< 2 sec) will revert to Watch Default Time.

• M (2 sec), or no button press for 2 min, will revert to Watch Default Time.

• L (press) will activate the Backlight.

Set Daily Alarm, information provided includes (Fig. 22):

> Graphic SEt. > Alarm Time previously set (hr:min), Hour digits ﬂashing. > Graphic ALRM and alarm icon.

• S (press/hold) will scroll upward through the Hour Set Points in 1 hour increments at a rate of 8 per second.

• S (< 2 sec) will step upward through the Set Points one at a time.

• A (< 2 sec) will save the Hour setting and ﬂash the Minute digits.

• S (press/hold) will scroll upward through the Minute Set Points in 1 minute increments at a rate of 8 per second.

• S (< 2 sec) will step upward through the Set Points one at a time.

• A (< 2 sec) will save the Minutes setting and revert to the Daily Alarm Status, the graphic OFF ﬂashing in place of SEt.

• S (< 2 sec) will toggle from OFF to ON, starting countdown.

Once the Daily Alarm has been set and turned ON, it will run in the background while on the surface until turned OFF. Alarm time is synchronized with the local Default Time selected for the current location. It will also run in the background while in Dive Computer modes but will not sound the audible or ﬂash the icon when the alarm time is reached during dives.

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AMPHOS DC MANUAL

DIVE COMPUTER

FEATURES & DISPLAYS

Page 14

AMPHOS DC MANUAL

BAR GRAPHS

The AMPHOS features 2 bar graphs, one on each side of the LCD.

• The one on the left (Fig. 23a) is dual function. It represents either Nitrogen loading or Oxygen accumulation. The icons N2 and O2 identify which is displayed at that time.

Regardless of which parameter the Bar Graph is representing at the time,

nitrogen and oxygen calculations will continue to be performed in the background.

• The one on the right (Fig. 23b) represents Ascent Rate. It is referred to as the ASC (Ascent Rate Indicator).

NIBG (Nitrogen Bar Graph)

The NIBG represents tissue loading of nitrogen, showing your relative no decompression or decompression status. As your depth and elapsed dive time increase, segments will add to the NIBG, and as you ascend to shallower depths, the segments will recede, indicating that additional no decompression time is allowed for multilevel diving.

The NIBG monitors 12 different nitrogen compartments simultaneously and displays the one that is in control of your dive. It is divided into a No Decompression (normal) zone, a Caution zone (also No Decompression), and a Decompression (danger) zone.

While you cannot provide a guarantee against the occurrence of decompression sickness, you may choose your own personal zone of caution based upon age, physique, excessive weight, etc., to reduce the statistical risk.

NOTE: Information associated with oxygen and the O2BG will only be displayed when FO2 has been set for Nitrox (e.g., a numerical value).

Oxygen Bar Graph (O2BG)

The O2BG represents oxygen accumulation, showing the maximum of either per dive accumulated oxygen, or 24 hour period accumulated oxygen.

As your oxygen exposure (accumulation) increases during the dive, segments will add to the O2BG, and as saturation decreases, it will begin to recede, indicating that additional exposure is allowed for that dive and 24 hour period.

Ascent Rate Indicator (ASC)

The ASC provides a visual representation of ascent speed (i.e., an ascent speedometer).

The segments of the ASC represent two sets of speeds that change at a reference Depth of 60 FT (18 M).

See chart at right.

WARNING: At depths greater than 60 FT (18 M), ascent rates should not exceed 60 FPM (18 MPM). At depths of 60 FT (18 M) and shallower, ascent rates should not exceed 30 FPM (9 MPM).

ALPHA / NUMERIC DISPLAYS

Depth

During dives, the Current Depth display (Fig. 24a) and Maximum Depth which is on an Alternate Display (Fig. 25a) indicate Depths from 0 to 330 FT (100 M) in increments of 1 FT (0.1 M).

No Deco Deep and Safety Stops, as well as Decompression Stops, display required Stop Depths.

Time and Date

Most Time displays like Time of Day (Fig. 25b) are shown in hour:minute format (i.e., 9:56 represents 9 hours and 56 minutes, not 956 minutes!). The colon that separates hr:min (min;sec) blinks once per second when the display is indicating real time (e.g., Time of Day).

Other times displayed include NDC (No Deco Time Remaining, Fig. 26a), and EDT (Elapsed Dive Time, Fig. 26b).

No Deco Stops and FREE Dive Mode times are displayed in minute:second format.

Temperature, Date, Elevation

Elevation, Date, and Temperature can be viewed by accessing the Watch Alternate Display (Fig. 27).

The only other place that Date is displayed is on Log Preview screens that identify dives (Fig. 28a).

When above the sea level range, which extends up to 3000 feet (915 meters), Altitude is displayed as EL (Elevation Level) from 2 up to 7.

EL2 = 3,01 to 5000 feet (916 to 1525 meters) EL3 = 5001 to 7000 feet (1526 to 2135 meters) EL4 = 7001 to 9000 feet (2136 to 2745 meters) EL5 = 9001 to 11000 feet (2746 to 3355 meters) EL6 = 11001 to 13000 feet (3356 to 3965 meters) EL7 = 13001 to 14000 feet (3966 to 4270 meters)

Fig. 23 - BAR GRAPHS

ASC values

Deeper than 60 FT (18 M) Segments Ascent Rate = Displayed FPM MPM 0 0 - 20 0 - 6 1 21-50 6.5-15 2 51-60 15.5-18 3 >60 >18

60 FT (18 M) & Shallower Segments Ascent Rate = Displayed FPM MPM 0 0 - 10 0 - 3 1 11-25 3.5-7.5 2 26-30 8-9 3 >30 >9

Fig. 25 - MAX DEPTH, TIME

Fig. 24 - DEPTH

Fig. 27 - ELEV, DATE, TEMP

Fig. 26 - NDC, EDT

Fig. 28 - DATE

Page 15

AMPHOS DC MANUAL

DIVE COMPUTER

SURFACE MODES

Page 16

AMPHOS DC MANUAL

DIVE COMPUTER (DC) OPERATING MODES

The AMPHOS features 3 DC Operating Modes -

• NORM >> for normal Air or Nitrox SCUBA dives.

• GAUG >> for SCUBA dives with no nitrogen/oxygen calculations.

• FREE >> for dives with no SCUBA.

SURFACE MODE

Depressing the M button for 2 seconds while Watch Default Time is displayed will access NORM Surface Main (Fig. 29) which is the default dive computer mode until another is selected.

• GAUG and FREE Surface Main screens (Fig. 30, 31) can be accessed by pressing M for 2 seconds while viewing NORM Surface Main. Their graphics will ﬂash indicating that they can be selected as the Operating Dive Mode.

• To select GAUG or FREE for diving, press/release M (< 2 sec) while the mode graphic (GAU or FREE) is ﬂashing. When the graphic becomes solid, that Mode is selected.

• The operating mode selected will remain on display for 2 hours until a dive is made or another mode is selected.

Once a dive has been conducted, the Surface Main for that mode will be displayed.

Operation will enter Dive Mode upon descent to 5 FT (1.5 M) for 5 seconds.

• During the 2 hour pre dive surface period, if the M button is pressed to access Watch Mode, DC Surface Mode must again be accessed prior to the ﬁrst dive of a series (if Wet Activation is set OFF).

• When Wet Activation is set ON, the wet contacts will activate the selected Dive Mode regardless of what Mode the AMPHOS is operating in at the time of the descent.

The AMPHOS will enter post dive Surface Mode upon ascent to 2 FT (0.6 M) for 1 second. The Surface Interval Time colon will ﬂash during the ﬁrst 10 minutes after a NORM or GAUG dive, or 1 minute after a FREE dive.

During the ﬁrst 10 minutes after a dive, the Surface Main screen for the operating mode remains on display. Watch Default Time can be viewed for 5 seconds during that period by pressing/releasing M (< 2 sec).

When the 10 minute Surface Time has elapsed, Watch Default Time will replace the DC Surface Main which can then be accessed by depressing M (2 sec).

NORM SURF MAIN, information includes (Fig. 32):

> Graphic Nor (indicating NORM mode). > Number of recent dive completed (0 if no dive made yet) with DIVE icon. > Surface Interval Time (hr:min) with SURF icon. > Gas (tank) 1 icon, 1 is the default on the surface. > NX icon, if either gas is set for Nitrox. > Battery icon if a Low Battery warning condition exists. > NIBG with N2 icon, if any residual nitrogen after a NORM or FREE dive.

• A (2 sec) will access NORM SURF ALT 1.

• A (< 2 sec) will access Log Mode, then again History.

• A + S (2 sec) will access the Set Modes.

• M (2 sec) will access GAUG Surface Main, then another 2 seconds FREE Surface Main.

• M (< 2 sec) will revert to Watch Default Time.

• S (< 2 sec) will access Plan Mode, then again after dives Time to Fly, then Dsat Time.

• L (press) will activate the Backlight.

NORM SURF ALT 1, information includes (Fig. 33):

> Altitude graphic EL2 to EL7, if above 3000 feet (915 meters), blank if Sea level. > Time of Day (hr:min). > Temperature with ° icon and graphic F (or C).

• A (< 2 sec) will access ALT 2 (after Nitrox dives), or revert to NORM SURF Main.

• After 5 sec, operation will revert to NORM SURF Main.

• L (press) will activate the Backlight.

NORM SURF ALT 2, information includes (Fig. 34):

> FO2 set for Gas in use at end of dive. > Gas (tank) 1 (or 2) icon, one in use at end of dive. > O2BG with O2 icon, current level of O2.

• A (< 2 sec) will revert to NORM SURF Main.

• After 5 sec, operation will revert to NORM SURF Main.

• L (press) will activate the Backlight.

Fig. 29 - NORM SURF MAIN

Fig. 31 - FREE SURF MAIN

Fig. 30 - GAUG SURF MAIN

Fig. 32 - NORM SURF MAIN

(post dive)

Fig. 33 - NORM SURF ALT 1

Fig. 34 - NORM SURF ALT 2

(only after Nitrox dives)

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AMPHOS DC MANUAL

NORM/GAUG SET MODES

Sequence >> SURF Main > Set F (FO2) > Set A (Alarms) > Set U (Utilities) > SN (Serial Number).

> Access and step through of the sequence is gained by simultaneous 2 second presses of A and S. > Alarms and Utilities can also be set/changed using the PC Interface program. FO2 must be set using the push buttons. > Settings remain at the values saved until they are changed.

SETTING FO2 FOR NITROX DIVES

For each value of FO2, the MOD (Max Operating Depth) that can be achieved for the PO2 Alarm value set will be displayed.

When the FO2 50% Default is set On and FO2 Gas 1 is set for a numerical value, 10 minutes on the surface after that dive, FO2 for Gas 1 will be displayed as 50 and further dives will be calculated based on 50% O2 for oxygen calculations and 21% O2 for Nitrogen calculations (79% Nitrogen), unless the FO2 for Gas 1 is set before the dive.

FO2 for Gas 1 continues to reset to the FO2 50% Default after subsequent repetitive dives until 24 hours elapse after the last dive, or the FO2 50% Default is turned Off.

When the FO2 50% Default is set Off, the FO2 for Gas 1 will remain at the last value saved for the remainder of that series of repetitive dives.

FO2 SET FOR AIR

The default FO2 for Gas 1 each new dive period is AIR.

When FO2 for Gas 1 is set for AIR, calculations are the same as when it is set for 21%. When FO2 for Gas 1 is set to AIR, it remains set for AIR until it is set for a numerical FO2 value (21 to 50%).

When FO2 is set only to AIR, the O2BG and PO2 values and/or warnings will not be displayed during the dive.

MODs affected by the PO2 limit set will not be displayed when FO2 for Gas 1 is set to AIR.

Internally, the AMPHOS keeps track of the O2 so that if FO2 for Gas 1 is subsequently set for a numerical value, the O2 accumulated during previous AIR dives will be accounted for in the next Nitrox dive (during that dive period and series of repetitive dives).

Once FO2 Gas 1 is set for a numerical value (21 to 50%) and a dive is made, the AIR option is disabled until 24 hours elapse after the last dive. The AIR option will not be displayed in Set FO2 Gas 1 until a full 24 hour Surface Interval has elapsed.

If FO2 for Gas 1 is set for 21%, it will remain set for 21% for that series of dives until set for a higher numerical value.

If the FO2 50% Default is set Off, FO2 for Gas 2 will remain as previously set until it is changed. If the FO2 50% Default is set On, FO2 for Gas 2 will Default to 50% after the dive.

SET F GROUP (FO2)

Selections >> Gas 1 > Gas 2 > 50% Default.

> A + S (2 sec), while viewing NORM SURF Main, will access Set F (Fig. 35). > A (< 2 sec) will then access Set FO2 Gas 1.

SET FO2 GAS 1, information includes (Fig. 36):

> Max Depth with MAX and FT (or M) icons, allowed for the PO2 Alarm Set, blank if Air. > PO2 Alarm set with PO2 icon, blank if Air. > FO2 setting ﬂashing with FO2 icon, either the graphic Air or Nitrox (numerical) value with NX icon. > Tank 1 icon, representing gas (mix) 1. > Graphic GAS1.

• S (hold) will scroll upward through the Set Points from Air to 21 through 50% in 1% increments, at a rate of 8 per second.

• The scroll will stop when S is released, or momentarily at 32% (even if S is held depressed).

• Depressing S again will resume the scroll from 32 through 50%, then stop at Air (or 21%).

• S (< 2 sec) will step upward through the Set Points one at a time.

• A (< 2 sec) will save the setting and access Set FO2 Gas 2.

• A + S (2 sec) will save the setting and revert to Set F.

• M (2 sec), or if no button is pressed within 2 minutes, operation will revert to the Surface Main.

SET FO2 GAS 2, information includes (Fig. 37):

> Max Depth with MAX and FT (or M) icons, allowed for the PO2 Alarm Set, blank if Air. > PO2 Alarm set with PO2 icon, blank if Air. > FO2 setting ﬂashing graphic Air or Nitrox (numerical) value with NX icon. > Tank 2 icon, representing gas (mix) 2. > Graphic GAS2.

• S (hold) will scroll through the Set Points from AIR to 21 through 100% in 1% increments, at a rate of 8 per second.

• The scroll will start at the FO2 Gas 1 Set Point* and stop when S is released, or momentarily at 50%, then again at 80%, then at the Gas 1 Set Point or at AIR (or 21%).

Fig. 35 - SET F GROUP

Fig. 36 - SET FO2 GAS 1

Fig. 37 - SET FO2 GAS 2

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AMPHOS DC MANUAL

• S (< 2 sec) will step through the Set Points one at a time.

• A (< 2 sec) will save the setting and access Set FO2 Default.

• A + S (2 sec) will save the setting and revert to Set F.

• M (2 sec), or if no button is pressed within 2 minutes, operation will revert to the Surface Main.

The AMPHOS is programmed to prevent FO2 for Gas 2 from being set at a value lower than the FO2 set for Gas 1. When setting FO2 for Gas 2, the lowest value available will be the Set Point of Gas 1.

SET FO2 50% DEFAULT, information includes (Fig. 38):

> Graphics FO2, dFLt, and 50. > Set Point graphic OFF (or ON), ﬂashing.

• S (< 2 sec) will toggle between OFF and ON.

• A (< 2 sec) will save the setting and revert to SET F.

• M (2 sec), or if no button is pressed within 2 minutes, operation will revert to the Surface Main.

SET A GROUP (ALARMS)

Selections >> Audible > Depth > EDT > NIBG > DTR > PO2.

> A + S (2 sec), while viewing Set F, will access Set A (Fig. 39). > A (< 2 sec) will then access Set Audible.

SET AUDIBLE, information includes (Fig. 40): This option allows the Audible Alarm to be disabled. Due to their importance, some cautionary situations will cause the Audible to sound even if this feature is set to Off.

> Graphic ON (or OFF), ﬂashing. > Graphic AUD.

• S (< 2 sec) will toggle between ON and OFF.

• A (< 2 sec) will save the setting and access Set Depth Alarm.

• A + S (2 sec) will save the setting and revert to Set A.

• M (2 sec), or if no button is pressed within 2 minutes, operation will revert to the Surface Main.

SET DEPTH ALARM information includes (Fig. 41):

> Graphic ON (or OFF), ﬂashing. > Depth value with MAX and FT (or M) icons. > Graphic DEEP.

• S ( < 2 sec) will step through the selections OFF, ON, and SEt.

• A (< 2 sec) will save the selection >> if ON or OFF is saved, advance to Set EDT Alarm. >> if SEt is saved, the Depth digits ﬂash (SEt goes solid).

• S (hold) will scroll upward from 30 to 330 FT (9 to 99 M) in 10 FT (1 M) increments at 8 per sec.

• S ( < 2 sec) will step up through the Set Points one at a time.

• A (< 2 sec) will save the setting and ﬂash SEt allowing ON or OFF to be selected..

• A + S (2 sec) will save the setting and revert to Set A.

• M (2 sec), or if no button is pressed within 2 minutes, operation will revert to the Surface Main.

SET EDT ALARM, information includes (Fig. 42):

> Graphic ON (or OFF), ﬂashing. > Elapsed Dive Time (hr:min). > Graphic EDT.

• S ( < 2 sec) will step through the selections OFF, ON, and SEt.

• A (< 2 sec) will save the selection >> if ON or OFF is saved, advance to Set NIBG Alarm. >> if SEt is saved, the Time digits ﬂash (SEt goes solid).

• S (hold) will scroll upward from 0:10 to 3:00 (hr:min) in 0:05 (5 min) increments at 8 per sec.

• S ( < 2 sec) will step up through the Set Points one at a time.

• A (< 2 sec) will save the setting and ﬂash SEt allowing ON or OFF to be selected..

• A + S (2 sec) will save the setting and revert to Set A.

• M (2 sec), or if no button is pressed within 2 minutes, operation will revert to the Surface Main.

Fig. 40 - SET AUDIBLE

Fig. 41 - SET DEPTH ALARM

Fig. 38 - SET FO2 DEFAULT

Fig. 39 - SET A GROUP

Fig. 42 - SET EDT ALARM

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AMPHOS DC MANUAL

SET NIBG ALARM, information includes (Fig. 43):

> Graphic ON (or OFF), ﬂashing. > Bar graph segments with N2 icon. > Graphic NIBG.

• S ( < 2 sec) will step through the selections OFF, ON, and SEt.

• A (< 2 sec) will save the selection >> if ON or OFF is saved, advance to Set DTR Alarm. >> if SEt is saved, the bar graph segments ﬂash (SEt goes solid).

• S (< 2 sec) will step up from 1 to 5 segments in 0:05 (5 min) increments one at a time.

• A (< 2 sec) will save the setting and ﬂash SEt allowing ON or OFF to be selected.

• A + S (2 sec) will save the setting and revert to Set A.

• M (2 sec), or if no button is pressed within 2 minutes, operation will revert to the Surface Main.

SET DTR (DIVE TIME REMAINING or RESERVE TIME) ALARM, information includes (Fig. 44):

> Graphic ON (or OFF), ﬂashing. > Reserve Time (min) with min icon. > Graphic DTR.

• S ( < 2 sec) will step through the selections OFF, ON, and SEt.

• A (< 2 sec) will save the selection >> if ON or OFF is saved, advance to Set PO2 Alarm. >> if SEt is saved, the Time digits ﬂash (SEt goes solid).

• S (hold) will scroll upward from 5 to 20 (min) in 1 min increments at 4 per sec.

• S ( < 2 sec) will step up through the Set Points one at a time.

• A (< 2 sec) will save the setting and ﬂash SEt allowing ON or OFF to be selected.

• A + S (2 sec) will save the setting and revert to Set A.

• M (2 sec), or if no button is pressed within 2 minutes, operation will revert to the Surface Main.

SET PO2 ALARM information includes (Fig. 45):

> Graphic ON (or OFF), ﬂashing. > PO2 value with PO2, MAX, and NX icons. > Graphic PO2.

• S ( < 2 sec) will step through the selections OFF, ON, and SEt.

• A (< 2 sec) will save the selection >> if ON or OFF is saved, revert to Set A. >> if SEt is saved, the PO2 digits ﬂash (SEt goes solid).

• S (< 2 sec) will step up from 1.20 to 1.60 (ATA) in .10 increments one at a time.

• A (< 2 sec) will save the setting and ﬂash SEt allowing ON or OFF to be selected.

• A + S (2 sec) will save the setting and revert to Set A.

• M (2 sec), or if no button is pressed within 2 minutes, operation will revert to the Surface Main.

SET U GROUP (UTILITIES)

Selections >> Wet Activation > Units > Deep Stop > Safety Stop > Conservative Factor > Backlight Duration > Sampling Rate.

> A + S (2 sec), while viewing Set A, will access Set U (Fig. 46). > A (< 2 sec) will then access Set Wet Activation.

SET WET ACTIVATION, information includes (Fig. 47):

> Graphic OFF (or ON) ﬂashing. > Graphics Activ WET.

• S (< 2 sec) will toggle between ON and OFF.

• A (< 2 sec) will save the setting and access Set Units.

• A + S (2 sec) will save the setting and revert to Set U.

• M (2 sec), or if no button is pressed within 2 minutes, operation will revert to the Surface Main.

SET UNITS, information includes (Fig. 48):

> FT (or M) icons ﬂashing. > Graphics UNIT.

• S (< 2 sec) will toggle between Imperial and Metric.

• A (< 2 sec) will save the setting and access Set Deep Stop.

• A + S (2 sec) will save the setting and revert to Set U.

• M (2 sec), or if no button is pressed within 2 minutes, operation will revert to the Surface Main.

Fig. 43 - SET NiBG ALARM

Fig. 44 - SET DTR ALARM

Fig. 45 - SET PO2 ALARM

Fig. 46 - SET U GROUP

Fig. 47 - SET WET

ACTIVATION

Fig. 48 - SET UNITS

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AMPHOS DC MANUAL

SET NORM DEEP STOP, information includes (Fig. 49):

> Graphic OFF (or ON) ﬂashing. > Graphics dEEP STOP.

• S (< 2 sec) will toggle between OFF and ON.

• A (< 2 sec) will save the setting and access Set Safety Stop.

• A + S (2 sec) will save the setting and revert to Set U.

• M (2 sec), or if no button is pressed within 2 minutes, operation will revert to the Surface Main.

When the Deep Stop is set On, a Stop screen will appear upon ascent to within 10 FT (3 M) below the calculated Stop Depth which is at 1/2 the Max Depth achieved after being deeper than 80 FT (24 M) for 1 second.

SET NORM SAFETY STOP, information includes (Fig. 50):

> Graphic OFF (or ON) ﬂashing. > Graphics SAFEtY STOP.

• S (< 2 sec) will toggle between OFF and ON.

• A (< 2 sec) will save the setting and access Set Conservative Factor.

• A + S (2 sec) will save the setting and revert to Set U.

• M (2 sec), or if no button is pressed within 2 minutes, operation will revert to the Surface Main.

When the Safety Stop is set On, a Stop screen will appear upon ascent to 20 FT (6 M) indicating that a Stop is to be taken at 15 FT (5 M) for 3 minutes after being deeper than 30 FT (9 M) for 1 second.

SET CONSERVATIVE FACTOR (CF), information includes (Fig. 51):

> Graphic OFF (or ON) ﬂashing. > Graphics CF.

• S (< 2 sec) will toggle between OFF and ON.

• A (< 2 sec) will save the setting and access Set Backlight Duration.

• A and S (simultaneously for 2 sec) will save the setting and revert to SET U.

• M (2 sec), or if no button is pressed within 2 minutes, operation will revert to the Surface Main.

When the Conservative Factor is set ON, the No Deco Limits are reduced to those that would be available at the next higher 3000 foot (915 meter) Altitude.

SET BACKLIGHT DURATION, information includes (Fig. 52):

> Graphic OFF (or ON) ﬂashing. > Graphics dur GLO. > Duration time (min) with min icon.

• S ( < 2 sec) will step through the selections OFF, ON, and SEt.

• A (< 2 sec) will save the selection >> if ON or OFF is saved, advance to Set Sampling Rate. >> if SEt is saved, the Time digits ﬂash (SEt goes solid).

• S (< 2 sec) will toggle between 5 and 10 (seconds).

• A (< 2 sec) will save the setting and ﬂash SEt allowing ON or OFF to be selected.

• A + S (2 sec) will save the setting and revert to Set U.

• M (2 sec), or if no button is pressed within 2 minutes, operation will revert to the Surface Main.

When the Backlight Duration is set On, the Backlight will remain On for the time set after the L button is pressed/released.

SET SAMPLING RATE, information includes (Fig. 53):

> Sampling Time (sec) ﬂashing with SEC icon. > Graphics PC SAMP.

• S (< 2 sec) will step through the selections of 2, 15, 30, and 60 (sec).

• A (< 2 sec) will save the setting and revert to Set U.

• A + S (2 sec) will save the setting and revert to Set U.

• M (2 sec), or if no button is pressed within 2 minutes, operation will revert to the Surface Main.

Sampling Rate is the frequency (time interval) at which data is sampled and stored in the unit's memory for subsequent download to the PC Interface program.

Fig. 49 - SET DEEP STOP

Fig. 51 - SET CONSERVA-

TIVE FACTOR

Fig. 50 - SET SAFETY STOP

Fig. 52 - SET BACKLIGHT

DURATION

Fig. 53 - SET SAMPLING

RATE

Page 21

AMPHOS DC MANUAL

SERIAL NUMBER, information includes (Fig. 54):

> A + S (2 sec), while viewing Set U, will access the Serial Number screen.

> Graphic SN (Serial Number). > Factory programmed Serial Number, up to 6 digits. > Firmware (operating software) revision (e.g., graphic R1A).

• A + S (2 sec) will revert to the Surface Main.

• M (2 sec), or if no button is pressed within 2 minutes, operation will revert to the Surface Main.

The Serial Number and Firmware Revision will be requested in the event that you contact Sherwood regarding the AMPHOS. Enter them in the Records section provided in the back of this Manual.

NORM PLAN MODE Sherwood strongly recommends that you review the Plan Mode prior to every NORM dive to help you plan your dive as required to avoid exceeding no decompression or oxygen exposure limits. This is espe-

cially important for repetitive dives when the Plan Mode indicates adjusted dive times that are available for the next dive, based on residual nitrogen or oxygen accumulation (whichever is in control) following the last dive and surface interval.

NOTE: No Decompression dive times in Plan Mode are based on the FO2 setting for Gas 1. The FO2 setting for Gas 2 is not utilized for Plan calculations.

• S (< 2 sec), while viewing NORM SURF Main, will access Plan Lead-in.

PLAN LEAD-IN, information includes (Fig. 55, 56):

> PO2 Alarm Set Point with PO2 icon if FO2 is set for Nitrox, blank if set for Air. > Graphic Air, or 21 to 50 (%), with FO2 and Tank (Gas) 1 icons. > NX icon, if Nitrox. > Graphic PLAN.

• A (< 2 sec), after dives, will access Time to Fly, then again Desat Time.

• S (< 2 sec) will access the ﬁrst Plan Depth/No Deco Dive time screen, then step through the sequence.

Plan will sequence through screens displaying Depths with NDLs from 30 up to 190 FT (9 to 57 M), or the Max Depth that will allow theoretical No Deco Dive Time of at least 1 minute based upon the previous dive proﬁles in a series of repetitive dives and taking into account descent and ascent rates of 60 FPM (18 MPM).

NOTE: When the Conservative Factor is set On, No Decompression Dive times are reduced to the values of the next 3000 foot (915 meter) higher Altitude.

PLAN DEPTH/TIME, information includes (Fig. 57):

> Max Depth allowed for the PO2 Alarm value set with MAX and FT (or M) icons, blank if FO2 is set for Air. > Plan Depth with FT (or M) icon. > Dive Time (min) allowed for the Depth displayed with min icon, NDC or OTL up to 199 minutes. > Tank 1 icon indicating Gas (mix) 1. > N2, or O2, icon, indicating that Nitrogen or Oxygen is the limiting time factor in control of calculations.

• S (< 2 sec), repeatedly, will step upward through the Planned Depths in increments of 10 FT (3 M).

• M (2 sec), or if no button is pressed within 2 minutes, operation will revert to the Surface Main.

FLY MODE

Time to Fly is a counter that begins counting down 10 minutes after surfacing from a dive from 23:50 to 0:00 (hr:min).

Ten minutes after a dive, operation reverts to Watch Default Time and the Time to Fly countdown continues in the background. Access to the Fly screen is then gained by ﬁrst accessing NORM (or GAUG) SURF Main.

NORM SURF Main >> A (< 2 sec), while viewing Plan Lead-in, will access Fly.

GAUG SURF Main >> S (< 2 sec) will access Fly.

TIME TO FLY, information includes (Fig. 58):

> Countdown Time (hr:min). > Graphic FLY.

• A (< 2 sec) will access Desat Time if in NORM, or revert to Surface Main if in GAUG.

• M (2 sec), or if no button is pressed within 2 minutes, operation will revert to the Surface Main.

• L (press) will activate the Backlight.

Fig. 54 - SERIAL NUMBER

(view only)

Fig. 56 - PLAN LEAD-IN

(FO2 set for Nitrox)

Fig. 55 - PLAN LEAD-IN

(FO2 set for Air)

Fig. 58 - TIME TO FLY

Fig. 57 - PLAN DEPTH/TIME

(FO2 set for Nitrox)

Page 22

AMPHOS DC MANUAL

DESAT MODE (NORM only)

The Time to Desaturate counter provides calculated time for Tissue Desaturation at sea level taking into consideration the Conservation Factor setting. It begins counting down 10 minutes after surfacing from a dive, counting down from 23:50 (hr:min) max to 0:00. When the Countdown reaches 0:00, which will generally occur prior to the Fly countdown reaching 0:00, the Desat screen remains accessible displaying 0:00 until the Fly counter shuts the Dive Computer operations Off 24 hours after a last dive.

> The Desat screen is not displayed after a Violation dive. > Desaturation requiring Times greater than 24 hours will display 23: - - . > In the event that Time to Desaturate still remains at the end of 24 hours, the added time will be zeroed. > Ten minutes after a dive, operation reverts to Watch Default Time and the Desat countdown continues in the background.

Access to the Desat screen is then gained by ﬁrst accessing NORM SURF Main.

• A (< 2 sec), while viewing Time to Fly while in NORM mode, will access the Desat Time screen.

DESAT TIME, information includes (Fig. 59):

> Graphic SAT. > Countdown Time (hr:min) with clock icon.

• A (< 2 sec) will revert to NORM Surface Main..

• M (2 sec), or if no button is pressed within 2 minutes, operation will revert to the Surface Main.

• L (press) will activate the Backlight.

NORM/GAUG LOG MODE

Log Mode displays information from the latest 24 NORM and/or GAUG dives sequentially in reverse order (the most recent ﬁrst).

Log information is retained until overwritten by another dive.

Battery removal will not affect the Log data stored for viewing.

After exceeding 24 dives, data from the most recent dive completed will be recorded in the Log and the oldest dive's data deleted.

Dives will be numbered 1 to 24 starting at #1 each time a new series of dives begins. When a dive period ends, 24 hours after the last dive, the ﬁrst dive of the next new period will be #1.

• A (< 2 sec), while viewing Watch Default Time, NORM SURF Main, or GAUG SURF Main, will access Log Mode displaying

the most recent dive’s Log Preview screen.

• S (hold) will scroll through the previous dives' Preview screens at 8 per second, from most recent to oldest recorded.

• S (< 2 sec), while viewing a Preview screen, will display that dive’s Log Data 1 screen.

> Log screens remain on display until further button action occurs.

• M (2 sec), or if no button is pressed within 2 minutes, operation will revert to the Surface Main.

• L (press) will activate the Backlight.

LOG PREVIEW, information includes (Fig. 60):

> Graphic LOG. > Dive number (1 to 24) for that period with DIVE icon. > Date (month.day or day.month) the dive was conducted. > Graphic NO-D, DECO, GAUG, or VIOL describing the type of dive. > NX icon, if a Nitrox dive.

• S (< 2 sec) will access that dive's Log Data 1 screen.

• A (< 2 sec) will bypass Log Mode and access History Data 1.

LOG DATA 1, information includes (Fig. 61):

> Graphic SEA (or EL2 o EL7), altitude at which the dive was conducted. > Time of Day the dive began (hr:min) with graphic A (or P) if 12 Hour Format. > NX icon, if a Nitrox dive.

• S (< 2 sec) will access Log Data 2.

• A (< 2 sec) will revert to NORM (or GAUG) SURF Main.

• M (2 sec), or if no button is pressed within 2 minutes, operation will revert to the Surface Main.

• L (press) will activate the Backlight.

Fig. 59 - DESAT TIME

Fig. 61 - LOG DATA 1

Fig. 60 - LOG PREVIEW

Page 23

AMPHOS DC MANUAL

LOG DATA 2, information includes (Fig. 62):

> Max Depth with MAX and FT (or M) icons. > Elapsed Dive Time (hr:min) with DIVE icon. > Pre dive Surface Interval (hr:min) with SURF icon, 3 dashes ( - : - - ) if no previous dive that period. > Temperature with ° icon and graphic F (or C), minimum recorded during that dive. > NIBG with N2 icon, the max segment ﬂashing, others ﬁxed up to end of dive accumulation. All ﬂashing if Violation. > ASC, segments representing max Ascent Rate recorded, sustained for 4 seconds.

• S (< 2 sec) will access Log Data 3.

• A (< 2 sec) will revert to NORM (or GAUG) SURF Main.

• M (2 sec), or if no button is pressed within 2 minutes, operation will revert to the Surface Main.

• L (press) will activate the Backlight.

LOG DATA 3 (only if NORM Nitrox), information includes (Fig. 63):

> Max PO2 achieved (ATA) with MAX icon and graphic PO2. > FO2 Set for the Gas in use at the end of the dive with Gas (tank) 1 (or 2), FO2, and NX icons. > O2BG with O2 icon, segments representing O2 accumulated at the end of the dive.

• S (< 2 sec) will access the previous dive's Log Preview.

• A (< 2 sec) will revert to NORM (or GAUG) SURF Main.

• M (2 sec), or if no button is pressed within 2 minutes, operation will revert to the Surface Main.

• L (press) will activate the Backlight.

HISTORY MODE

History Mode displays information for up to 999 NORM and/or GAUG Dives, 9999 Dive Hours, and the Maximum Depth achieved. History information is retained indeﬁnitely. Battery removal will not affect the History data stored for viewing.

• A (< 2 sec), while viewing the Log Preview of the most recent dive, will access History Data 1.

HISTORY 1, information includes (Fig. 64):

> Total number of all dives recorded up to 999 with DIVE icon. > Total hours of dive time recorded up to 9999 with graphic Hr. > Graphic HIST.

• S (< 2 sec) will access History 2 Data.

• A (< 2 sec) will revert to NORM (or GAUG) SURF Main.

HISTORY 2, information includes (Fig. 65):

> Max Depth with MAX and FT (or M) icons, deepest ever recorded. > EDT (hr:min) with DIVE icon, longest dive time recorded for a single dive. > Graphic SEA (or EL 2 through EL 7), max Altitude at which a dive was conducted. > Temperature with ° icon and graphic F (or C), lowest ever recorded during a dive.

• A (< 2 sec) will revert to NORM (or GAUG) SURF Main.

• M (2 sec), or if no button is pressed within 2 minutes, operation will revert to the Surface Main.

• L (press) will activate the Backlight.

NOTE: FREE Dives are not recorded in the viewable Log or History. The data is stored in memory which can be downloaded to the Sherwood PC Interface program.

Fig. 64 - HISTORY 1

Fig. 65 - HISTORY 2

Fig. 63 - LOG DATA 3

(only NORM Nitrox)

Fig. 62 - LOG DATA 2

Page 24

AMPHOS DC MANUAL

NORM

DIVE MODES

Page 25

AMPHOS DC MANUAL

DIVE TIME REMAINING (DTR)

The AMPHOS constantly calculates No Deco Time Remaining (NDC) and O2 Time Remaining (OTR), and displays whichever one is the least amount available at the time as Dive Time Remaining (DTR).

No Deco Time Remaining (NDC)

NDC is the maximum amount of time that you can stay at your present Depth before entering Decompression. It is calculated based on the amount of Nitrogen absorbed by hypothetical tissue compartments.

The rates each of these compartments absorb and release Nitrogen is mathematically modeled and compared against a maximum allowable Nitrogen level.

Whichever one is closest to this maximum level is the controlling compartment for that Depth. Its resulting value will be displayed on the Dive Main screen as minutes NDC time (Fig. 66a) and graphically as the NIBG (Fig. 66b).

As you ascend from Depth during a dive, the NIBG segments will recede as control shifts to slower compartments.

This is a feature of the Decompression model that is the basis for multilevel diving, one of the most important advantages that the AMPHOS offers.

O2 Time Remaining (OTR)

When FO2 is set for a numerical value (Nitrox), the O2BG (Fig. 67a) will add segments to represent oxygen accumulation for that dive, or 24 hour period, whichever amount is greater.

When OTR becomes less than NDC, it is displayed as DTR on the Main Dive screen.

ASCENT RATE INDICATOR (ASC)

The ASC shows how fast you are ascending. When you exceed the maximum recommended Ascent Rate for the depth you are at, the Audible will sound during which time all segments of the ASC and the graphic SLOW will ﬂash on the Dive Main screen (Fig. 68). The ﬂashing will stop and normal information will be restored when the audible is silenced or your Ascent Rate is slowed below the allowed rate.

The Ascent Rate alarm is based upon 2 sets of speeds which change at a reference depth of 60 FT (18 M). See page 13.

WARNING: At depths greater than 60 FT (18 M), ascent rates should not exceed 60 FPM (18 MPM). At depths of 60 FT (18 M) and shallower, rates should not exceed 30 FPM (9 MPM).

NORM NO DECOMPRESSION DIVE MODE

When the Wet Activation feature is set ON, the AMPHOS will enter the NORM No Decompression Dive Mode any time you descend to 5 FT (1.5 M) for 5 seconds.

When the Wet Activation feature is set OFF, the AMPHOS will not enter Dive Mode upon descent unless it is operating in one of the NORM Dive Computer modes (menus) at that time. Modes such as Surface Mode, Plan, Fly, etc.

NORM NO DECO MAIN, information includes (Fig. 69) -

> Elapsed Dive Time (hr:min) with DIVE icon. > Current Depth with FT (or M) icon. > Dive Time Remaining (min) with NDC (or O2) and min icons. > Gas (tank) icon, Gas in use (1 or 2). > NX icon, if either gas is set for Nitrox. > NIBG with N2 icon, representing nitrogen loading. > ASC, while ascending, ﬂashing when too fast.

• A (< 2 sec) to access ALT 1.

• A (2 sec) to access Deep Stop Preview, if set On and triggered.

• M (2 sec) to access the Gas Switch Preview.

• S (< 2 sec) to acknowledge/silence alarms.

• L (press) to activate Backlight.

NORM NO DECO ALT 1,information includes (Fig. 70) -

> Max Depth with MAX and FT (or M) icons. > Time of Day (hr:min). > Temperature with ° icon and graphic F (or C).

• A (< 2 sec) to access ALT 2.

• Operation will revert to Main after 5 seconds, if A is not pressed.

• L (press) to activate Backlight.

Fig. 66 - DTR (NDC)

Fig. 67 - O2BG

Fig. 68 - ASCENT ALARM

Fig. 69 - NO DECO MAIN

Fig. 70 - NO DECO ALT 1

Page 26

AMPHOS DC MANUAL

NORM NO DECO ALT 2, information includes (Fig. 71) -

> PO2 (x.xx ATA) with PO2 icon. > FO2 setting for Gas in use with FO2 and NX icons. > Gas (tank) icon, one in use (1 or 2) > O2BG with O2 icon.

• A (< 2 sec) to access ALT 3.

• Operation will revert to Main after 5 seconds, or if A is pressed.

• L (press) to activate Backlight.

ALT screens cannot be accessed during the time while the Audible is sounding.

NO DECO DEEP STOP

On any No Deco dive in which Depth exceeds 80 FT (24 M), a Deep Stop Preview screen (Fig. 72) can be accessed that will display the graphic DSP (meaning Deep Stop Preview) and a recommended Stop Depth calculated to be 1/2 the Max Depth and a Stop Time of 2:00 (2 minutes) with STOP and FT (or M) icons. It will revert to the Main after 5 seconds.

• The intent of this screen is to suggest that a Stop should be made as indicated to help reduce tissue nitrogen loading prior to ﬁnal ascent.

• The Preview screen will not be available for viewing once you ascend above the Stop Depth.

NOTE: The Deep Stop is not required and although recommended, it does not have to be taken. There is no penalty if the Stop is ignored and ascent (or other activity) is continued.

Upon ascending to within 10 FT (3 M) below the calculated Stop Depth, the DS Main screen (Fig. 73) will appear displaying the calculated Stop Depth with FT (or M) and STOP icons and the Timer that counts down from 2:00 to 0:00 (min:sec). Also displayed will be Current Depth, DTR, and bar graphs.

• A (< 2 sec) to access ALT displays, similar to No Deco ALTs with EDT on ALT 1.

• M (2 sec) to access Gas Switch Preview.

• L (press) to activate Backlight.

When the DS countdown reaches 0:00, the No Deco Main will be displayed and the DS feature will be disabled for the remainder of that dive.

If you descend 10 FT (3 M) below, or ascend 10 FT (3 M) above the Stop Depth, for more than 10 seconds during the countdown, the No Deco Main will be displayed and the DS feature will be disabled for the remainder of that dive.

If you return to within the +/- 10 FT (3 M) range during the 10 seconds, the DS Main will reappear with the countdown still in progress.

The DS feature will be disabled, and it's screens not displayed, for the remainder of that dive, if you enter Deco or O2 increases to (80%), or you descend deeper than 190 FT (63 M).

During High PO2 (=> Alarm Set Point), the DS screen information will be replaced with High PO2 information.

NO DECO SAFETY STOP (Fig. 74) Upon ascending to 20 FT (6 M) on any No Deco dive in which Depth exceeded 30 FT (9 M), a Safety Stop (SS) screen will appear displaying a recommended Stop at 15 FT (5 M) with a Countdown Timer that counts down from 3:00 to 0:00 (min:sec).

The SS will be displayed until the countdown times out, or you descend below 30 FT (9 M) during the countdown, or you surface during the countdown.

• Like the DS, there is no Penalty for surfacing prior to completing the SS.

• There is no Preview screen associated with the Safety Stop.

SS Main display information includes Stop Depth (15 FT or 5 M) with STOP and FT (or M) icons, Countdown Timer (min:sec), Current Depth, DTR, Pressure, and bar graphs.

• A (< 2 sec) to view ALTs, similar to those for DS.

• M (2 sec) to access Gas Switch Preview.

• L (press) to activate Backlight.

Fig. 71 - NO DECO ALT 2

Fig. 72 - DS PREVIEW

Fig. 73 - DS MAIN

Fig. 74 - SS MAIN

Page 27

AMPHOS DC MANUAL

CAUTIONARY

MODES

Page 28

AMPHOS DC MANUAL

DECOMPRESSION

Decompression mode activates when theoretical No Decompression time and depth limits (NDLs) are exceeded.

Upon Entry into Deco, the Audible will sound until acknowledged or time out of 10 seconds. While it is sounding, the UP Arrow icon and graphic DECO will ﬂash to alert you.

DECO ENTRY, information includes (Fig. 75)

> Stop Depth with STOP and FT (or M) icons. > Stop Time (hr:min). > UP Arrow icon, ﬂashing until you ascend to within 10 FT (3 M) below the Stop Depth indicated, then it is removed. > Current Depth with FT (or M) icon. > TAT (min) with TAT and min icons.

TAT represents Total Ascent Time which includes time required for all deco stops plus

vertical ascent time to the surface.

> Graphic DECO, ﬂashing while audible sounds then blank. > Gas (tank) icon, one in use (1 or 2). > NX icon, if Nitrox. > Full NIBG with N2 icon. > ASC while ascending.

• S (< 2 sec) to acknowledge/silence the Audible.

• L (press) to activate Backlight.

NOTE: Upon entry into Deco, the Deep and Safety Stop features are disabled for the remainder of that dive, even if No Deco status is regained.

MANAGING DECOMPRESSION STOPS

To fulﬁll your decompression obligation, you should make a safe controlled Ascent to a depth slightly deeper than, or equal to, the Stop Depth indicated and decompress for the Time indicated.

The amount of decompression credit time that you receive is dependent on Depth, with slightly less credit given the deeper you are below the Stop Depth indicated.

DECO STOP MAIN, information includes (Fig. 76) -

> Stop Depth with STOP and FT (or M) icons. > Stop Time (hr:min). > Current Depth with FT (or M) icon. > TAT (min) with TAT and min icons. > Gas (tank) icon, one in use (1 or 2). > NX icon, if Nitrox. > Full NIBG with N2 icon.

• A (< 2 sec) to view ALTs (similar to those for DS).

• M (2 sec) to access the Gas Switch Preview.

• S (< 2 sec) to acknowledge/silence alarms.

• L (press) to activate Backlight.

CONDITIONAL VIOLATION (CV)

If you ascend above a calculated Deco Stop, no off gassing credit will be given. While above the Stop, a penalty time equal to 1 +1/2 minutes will be added to Stop Time for each minute above the Stop. If you descend below the Stop Depth before 5 minutes elapse, operation will continue to function in Deco and off gassing credit will resume.

CV MAIN, information includes (Fig. 77) -

> Stop Depth with STOP and FT (or M) icons. > Stop Time (hr:min). > Down Arrow icon ﬂashing until below the Stop Depth indicated.. > Current Depth with FT (or M) icon. > TAT (min) with TAT and min icons. > Graphic DOWN ﬂashing while the audible sounds, then blank. > Gas (tank) icon, one in use (1 or 2). > NX icon, if Nitrox. > Full NIBG with N2 icon.

• A (< 2 sec) to view ALTs (similar to those for DS).

• M (2 sec) to access the Gas Switch Preview.

• S (< 2 sec) to acknowledge/silence alarms.

• L (press) to activate Backlight.

Fig. 75 - DECO ENTRY

(during audible)

Fig. 76 - DECO STOP MAIN

Fig. 77 - CV MAIN

Page 29

AMPHOS DC MANUAL

Upon entry into the following Violation modes, the Alarm will sound, even if set Off.

When these events occur, the Alarm cannot be acknowledged (silenced) by pressing S.

DELAYED VIOLATION 1 (DV1)

If you surface during the 5 minute CV or remain above a required Deco Stop Depth for more than 5 minutes, the audible will sound during which the full NIBG will ﬂash. The penalty time equal to 1 +1/2 minutes will continue to be added to Stop Time for each minute above the Stop. This is a continuation of CV.

DV1 MAIN, information includes (Fig. 78) -

> Stop Depth with STOP and FT (or M) icons. > Stop Time (hr:min). > Down Arrow icon ﬂashing until below the Stop Depth indicated.. > Current Depth with FT (or M) icon. > TAT (min) with TAT and min icons. > Graphic DOWN ﬂashing while the audible sounds, then solid until below the Stop. > Gas (tank) icon, one in use (1 or 2). > NX icon, if Nitrox. > Full NIBG with N2 icon, ﬂashing while the audible sounds.

• A (< 2 sec) to view ALTs (similar to those for DS).

• M (2 sec) to access the Gas Switch Preview.

• S (< 2 sec) to acknowledge/silence other alarms.

• L (press) to activate Backlight.

DELAYED VIOLATION 2 (DV2)

If Decompression requires a Stop Depth between 60 and 70 FT (18 and 21 M), the full NIBG and TAT digits will ﬂash. When this occurs, you must make a controlled ascent to just deeper than, and stay as close as possible to, 60 FT (18 M) without causing the NIBG to ﬂash. When the Deco Stop Depth indicates 50 FT (15 M), etc., you can ascend to those Stop Depths and continue decompressing.

DV2 MAIN, information includes (Fig. 79) -

• A (< 2 sec) to view ALTs (similar to those for DS).

• M (2 sec) to access the Gas Switch Preview.

• S (< 2 sec) to acknowledge/silence other alarms.

• L (press) to activate Backlight.

DELAYED VIOLATION #3 (DV3)

If you descend deeper than the MOD (Max Operating Depth) of 330 FT (100 M), the Up Arrow icon and graphic UP will ﬂash, and the Current Depth will only display 3 dashes ( - - - ) signifying that you are out of range. Max Depth on the ALT screen will only indicate 3 dashes ( - - - ).

Upon ascending above 330 FT (100 M), the Current Depth display will be restored, however, Max Depth will only display 3 dashes for the remainder of that dive. Also, the Log for that dive will display 3 dashes as the Max Depth achieved.

DV3 MAIN, information includes (Fig. 80) -

> Up Arrow icon with graphic UP, ﬂashing until above MOD then removed. > Elapsed Dive Time (hr:min) with DIVE icon. > Current Depth, as 3 dashes ( - - - ), with FT (or M) icon. > Dive Time Remaining (min) if accurate, or 2 dashes ( - - ) if not, with NDC and min icons. > Gas (tank) icon, Gas in use (1 or 2). > NX icon, if either gas is set for Nitrox. > NIBG with N2 icon, representing nitrogen loading. > ASC, while ascending.

• A (< 2 sec) to view ALTs (similar to those for No Deco).

• M (2 sec) to access the Gas Switch Preview.

• S (< 2 sec) to acknowledge/silence other alarms.

• L (press) to activate Backlight.

Fig. 79 - DV2 MAIN

(during audible)

Fig. 80 - DV3 MAIN

Fig. 78 - DV1 MAIN

(during audible)

Page 30

AMPHOS DC MANUAL

VIOLATION GAUGE MODE (VGM)

If calculations require a Deco Stop Depth greater than 70 FT (21 M), operation will enter Violation Gauge Mode (VGM) for the remainder of that dive and for 24 hours after surfacing.

The AMPHOS will also enter VGM if Deco is entered while operating in FREE Mode (described later).

VGM turns the AMPHOS into a digital instrument without any nitrogen or oxygen calculations or monitoring functions or displayed information until 24 contiguous hours elapse on the surface with no dives.

VGM Main, information includes (Fig. 81) -

> Up Arrow icon with graphic UP, ﬂashing until on surface then removed. > Elapsed Dive Time (hr:min) with DIVE icon. > Current Depth with FT (or M) icon. > Gas (tank) icon, Gas in use (1 or 2). > NX icon, if either gas is set for Nitrox. > Full NIBG with N2 icon, ﬂashing while audible sounds then removed. > ASC, while ascending.

• A (< 2 sec) to view ALTs (similar to those for No Deco).

• M (2 sec) to access the Gas Switch Preview.

• S (< 2 sec) to acknowledge/silence other alarms.

• L (press) to activate Backlight.

The AMPHOS will also enter VGM 5 minutes surfacing from a dive in which a Delayed Violation (1, 2, or 3), or 100% O2 condition occurred.

Once on the surface, VGM does not allow access to the Set F, Plan, and Desat features/screens.

This condition is a Permanent Violation, and in the event that a dive is made during the 24 hour period, a full 24 hour surface interval must then be served before all functions are restored.

VGM MAIN (on surface), information includes (Fig. 82) -

> Graphic Vio during the ﬁrst 10 minutes, then alternating with Nor for 24 hours. > Number of recent dive completed with DIVE icon. > Surface Interval Time (hr:min) with SURF icon. > Tank icon (1 or 2) representing the Gas in use, default to #1 after 10 minutes. > Battery icon if a Low Battery condition exists.

• A (2 sec) will access NORM SURF ALT.

• A (< 2 sec) will access Log Mode, then again History.

• A + S (2 sec) will access the Set Modes.

• M (2 sec) will access GAUG Surface Main, then another 2 seconds FREE Surface Main.

• M (< 2 sec) will revert to Watch Default Time.

• S (< 2 sec) will access the Time to Fly countdown screen*.

• L (press) will activate the Backlight.

*The countdown timer that appears when you access Fly is only provided to inform you of the time remaining before normal

Dive Computer operation can resume with full features and functions.

HIGH PO2

Warning at 0.20 (ATA) less than the PO2 Alarm value set*. Alarm at the value set*.

*While in Deco, High PO2 will only alarm at 1.60 (no warning).

When PO2 increases to the Warning level, the audible will sound until acknowledged or time out during which the graphic UP and Up Arrow icon will ﬂash and the graphic PO2 value with PO2 icon will ﬂash on the Dive Main in place of Depth (Fig. 83).

After the audible is silenced, Depth will be restored, while the graphic UP and Up Arrow icon will remain on solid (Fig. 84) until PO2 decreases below the Warning level when they will be removed.

When PO2 reaches the Alarm level, the Audible will sound again and information will be displayed as indicated above with the exception the PO2 value will alternate with Depth until it decreases below the Alarm level.

• S (< 2 sec) to acknowledge/silence the Audible.

• A (< 2 sec) to view ALTs.

• M (2 sec) to access the Gas Switch Preview.

• L (press) to activate Backlight.

Fig. 82 - VGM SURF MAIN

Fig. 83 - HIGH PO2

(during Audible)

Fig. 84 - HIGH PO2

(after Audible)

Fig. 81 - VGM DIVE MAIN

Page 31

AMPHOS DC MANUAL

HIGH O2

Warning at 80% (240 OTU). Alarm at 100% (300 OTU).

O2 Warning

If the theoretical amount of oxygen accumulated reaches 80% of the limit for a single exposure or 24 hour period, the Audible will sound during which the Up Arrow icon and graphics O2 - 80 will ﬂash in place of EDT time (or if in Deco Stop Depth/Time) (Fig. 85).

When the audible is acknowledged/silenced, EDT (or if in Deco Stop Depth/Time) will be restored and the Up Arrow will remain on solid until O2 decreases below 80% then it will be removed.

O2 Alarm

If O2 continues to increase and reaches 100% of the limit (300 OTU), the Audible will sound again during which the Up Arrow icon and graphics O2 - 100 will ﬂash in place of EDT time (or if in Deco Stop Depth/Time), the graphic UP will ﬂash in place of DTR, and the full O2BG will be displayed in place of the NIBG (Fig. 86).

When the audible is acknowledged/silenced, EDT will be restored (even if in Deco when Stop Depth/Time will be removed), while the Up Arrow and graphics O2 and UP will continue to ﬂash until on the surface (Fig. 87).

• S (< 2 sec) to acknowledge/silence the Audible.

• A (< 2 sec) to view ALTs.

• M (2 sec) to access the Gas Switch Preview.

• L (press) to activate Backlight.

O2 Alarm on Surface

Upon surfacing while O2 is 100%, the graphic O2 will ﬂash in place of Nor for the ﬁrst 10 minutes (Fig. 88) then alternate with Nor until O2 decreases below 100% (O2BG recedes to 4 segments) at which time O2 will be removed.

Fig. 85 - O2 WARNING

(during audible)

Fig. 86 - O2 ALARM

(during audible)

Fig. 87 - O2 ALARM

(after audible)

Fig. 88 - O2 ALARM

(on surface < 10 min)

WARNINGS:

Making decompression dives without the proper preparation and training will place you in an unnecessarily dangerous situation.

Existing data for making planned decompression dives is limited, and virtually nonexistent for repetitive decompression diving.

Decompression diving greatly increases your risk of decompression sickness.

Special training, equipment, and support are necessary for diving deeper than the maximum recommended sport diving depth limit(s).

RESPONSIBLE COMPUTER DIVING

• Plan each dive, and dive your plan. The AMPHOS was not designed to make decisions for you, only to provide you with the information you need to make responsible decisions for yourself. This begins with a dive Plan that will help you avoid a low air or decompression situation.

• Do not plan any dive that exceeds your training or experience level.

• Inspect your AMPHOS before every dive. If it shows any signs of damage or abnormal function, DO NOT dive with it until it has received factory prescribed service.

• Make a Safety Stop at 15 to 20 FT (4.5 to 6 M) at the end of every dive. It's important, don't forget it.

• You should make every effort to complete all of your ascents with the Nitrogen Bar Graph inside the No Decompression zone.

• If you inadvertently entered Decompression, you should not complete your ascent until the Nitrogen Bar Graph is at least inside the No Decompression Caution Zone.

• While you cannot provide a guarantee against the occurrence of decompression sickness, you may choose your own personal zone of caution based upon your individual age, physique, excessive weight, training, experience, etc. to reduce the statistical risk. By not pushing the limits, you can establish and adjust your personal level of conservatism and margin of safety.

Page 32

AMPHOS DC MANUAL

SWITCHING

GAS MIXES

Page 33

AMPHOS DC MANUAL

SWITCHING (NORM)

During NORM Dives, the AMPHOS can be manually switched from Gas 1 to Gas 2, changing FO2 displays and calculations.

Every dive begins with Gas 1, and 10 minutes after surfacing from a multiple gas dive, operation defaults to the Gas 1 FO2.

Access to Switching screens can only be accomplished during the time that a Dive Main screen is being displayed and cannot be performed during the time that an Alarm is sounding or while on the surface.

If a Switch to a new Gas would expose the diver to a prohibitive PO2 level of 1.60 ATA or greater, the Audible will sound during which a message will be displayed for 10 seconds (Fig. 89).

Due to the possibility that sufﬁcient air may not be available in the Switch From tank to complete the dive, the Switch to the prohibitive mix can still be made. If the Switch is made to the prohibitive mix, the High PO2 Alarm will activate.

Switching of Gas mixes can only to be performed during the time that a Gas Switch Preview screen is being displayed. These are accessed from a Dive Main screen.

• M (2 sec) while viewing a Dive Main will access the Gas 1 Switch Preview screen.

GAS 1 SWITCH PREVIEW, information includes (Fig. 90) -

> Graphic GAS 1. > Current PO2 value with PO2 icon, based on current depth and FO2 displayed. > FO2 set for Gas 1 with FO2 icon. > Gas (tank) 1 icon. > NX icon if Nitrox.

• M (< 2 sec) to access the Gas 2 Switch Preview.

• S (< 2 sec) to switch to Gas 1, after 3 sec, then revert to the Main with calculations/displays based on Gas 1*.

• Operation will revert to the Dive Main after 10 seconds if no button action.

GAS 2 SWITCH PREVIEW, information includes (Fig. 91) -

> Graphic GAS 2. > Current PO2 value with PO2 icon, based on current depth and FO2 displayed. > FO2 set for Gas 2 with FO2 icon. > Gas (tank) 2 icon. > NX icon if Nitrox.

• M (< 2 sec) to revert to Dive Main.

• S (< 2 sec) to switch to Gas 2, after 3 sec, then revert to the Main with calculations/displays based on Gas 2*.

• Operation will revert to the Dive Main after 10 seconds if no button action.

Fig. 89 - DON'T SWITCH

GAS ALARM

Fig. 90 - GAS 1

PREVIEW

Fig. 91 - GAS 2

PREVIEW

Page 34

AMPHOS DC MANUAL

GAUGE

OPERATING MODE

NOTE: Once a dive is made in Digital Gauge Mode, you must wait 24 contiguous hours after surfacing before the AMPHOS resets and will operate as an Air or Nitrox dive computer in NORM Mode or FREE Dive Mode.

Page 35

AMPHOS DC MANUAL

DIGITAL GAUGE MODE

When Digital Gauge Mode (GAUG) is selected as the operating mode, the AMPHOS will operate as a Digital Depth Gauge/ Timer without performing nitrogen and oxygen calculations.

• M (2 sec), while the NORM SURF Main is displayed, will access GAUG SURF Main.

• M (< 2 sec), while the graphic GAU is ﬂashing, will select GAUG as the operating dive mode. The graphic GAU becomes solid and GAUG Mode is selected.

• If no GAUG dive has been conducted, M (2 sec) will access FREE SURF Main.

GAUG SURF MAIN, information includes (Fig. 92) -

> Graphic GAU (indicating mode). > Number of recent dive completed (0 if no dive made yet) with DIVE icon. > Surface Interval Time (hr:min) with SURF icon. > Battery icon if a Low Battery warning condition exists.

• A (2 sec) will access GAUG SURF ALT.

• A (< 2 sec) will access Log Mode, then again History.

See page 20.

• A + S (2 sec) will access the Set Modes.

See page 15.

• M (2 sec), if no GAUG dive yet, will access FREE Surface Main, then NORM Surface Main.

• M (< 2 sec) will revert to Watch Default Time.

• S (< 2 sec), after a dive, will access Time to Fly.

See page 19.

• L (press) will activate the Backlight.

GAUG SURF ALT, information includes (Fig. 93):

> Altitude graphic EL2 to EL7, if above 3000 feet (915 meters), blank if Sea level. > Time of Day (hr:min). > Temperature with ° icon and graphic F (or C).

• A (< 2 sec) will revert to GAUG SURF Main.

• After 5 sec, operation will revert to GAUG SURF Main.

• L (press) will activate the Backlight.

GAUGE DIVE MAIN, information includes (Fig. 94) -

> Elapsed Dive Time (hr:min) with DIVE icon. > Current Depth with FT (or M) icon. > ASC, while ascending, ﬂashing when too fast.

• A (< 2 sec) to access ALT.

• S (< 2 sec) to acknowledge/silence alarms.

• L (press) to activate Backlight.

GAUG DIVE ALT,information includes (Fig. 95) -

> Max Depth with MAX and FT (or M) icons. > Time of Day (hr:min). > Temperature with ° icon and graphic F (or C).

• A (< 2 sec) to revert to Main.

• Operation will revert to Main after 5 seconds, if A is not pressed.

• L (press) to activate Backlight.

DELAYED VIOLATION #3 (DV3)

DV3 MAIN, information includes (Fig. 96) -

> Up Arrow icon with graphic UP, ﬂashing in place of Max Depth until above MOD then Max Depth as 3 dashes ( - - - ). > Elapsed Dive Time (hr:min) with DIVE icon. > Current Depth, as 3 dashes ( - - - ), with FT (or M) icon. > ASC, while ascending.

• A (< 2 sec) to view ALT.

• S (< 2 sec) to acknowledge/silence other alarms.

• L (press) to activate Backlight.

Fig. 92 - GAUG SURF MAIN

Fig. 94 - GAUG DIVE MAIN

Fig. 95 - GAUG DIVE ALT

Fig. 93 - GAUG SURF ALT

Fig. 96 - GAUG DV 3

Page 36

AMPHOS DC MANUAL

FREE DIVE

OPERATING MODE

FREE Mode uses the NORM/GAUG settings for >> Time/Date, Wet Activation, Units, Conservative Factor, and Backlight Duration.

Page 37

AMPHOS DC MANUAL

FREE DIVE MODE

When Free Dive Mode is selected, nitrogen loading is calculated based on a default FO2 of Air. The amount of nitrogen remaining during 24 hours is carried over between FREE and NORM operating modes.

• M (2 sec), while viewing GAUG SURF Main, will access FREE SURF Main.

• M (< 2 sec), while the graphic FREE is ﬂashing, will select it as the operating mode.

FREE SURFACE MAIN, information includes (Fig. 97) -

> Graphic tot with Total number of repetitive Free dives conducted (0 if none yet) in that series with DIVE icon. > Surface Interval after the most recent dive (min:sec with icons to 59:59, then hr:min) with SURF icon. > Graphic FREE. > NIBG with N2 icon if any after FREE or NORM dives. > Battery icon if a Low Battery condition exists

• A (< 2 sec) to access SURF ALT 1.

• A (2 sec) to access CDT Status.

• A + S (2 sec) to access the Set EDT Alarm.

• M (< 2 sec) to access Watch Default Time.

• M (2 sec) to access NORM SURF Main.

• L (press) to activate Backlight.

FREE SURFACE ALT 1, information includes (Fig. 98) -

> Max Depth of last dive with MAX and FT (or M) icons. > EDT (min:sec) of last dive with DIVE icon. > Surface Interval prior to last dive (min:sec) with SURF, min, and sec icons. > Graphic LAST.

• A (< 2 sec) to access ALT 2.

• Revert to Main after 5 seconds if A is not pressed.

• L (press) to activate Backlight.

FREE SURFACE ALT 2, information includes (Fig. 99) -

> Altitude graphic EL2 to EL7, if above 3000 feet (915 meters), blank if Sea level. > Time of Day (hr:min). > Temperature with ° icon and graphic F (or C).

• A (< 2 sec) to revert to the Main, or after 5 seconds if A is not pressed.

• L (press) to activate Backlight.

FREE CDT STATUS (COUNTDOWN TIMER), information includes (Fig. 100, 101):

> Graphic OFF (or ON) ﬂashing, with 0:00 if no time was previously set, the remaining Countdown Time (min:sec) if running,

or the Countdown Time previously set.

> Graphic CDT.

• S (< 2 sec) will toggle between ON and OFF. A toggle to ON will Start the Timer if a Time has been set.

• A (< 2 sec) will save the selection.

>> If OFF is saved, the CD Time in progress will stop counting down and access to Set will be allowed. >> If ON is saved, the CD Time displayed (previously set) will start counting down and access to Set will be blocked.

• A + S (2 sec) will display the graphic SEt in place of OFF, allowing the Time to be set.

• M (2 sec) will revert to the FREE SURF Main.

• L (press) will activate the Backlight.

SET CDT, information includes (Fig. 102):

> Graphic SEt with last Time (min:sec) set, Minute digits ﬂashing. > Graphic CDT.

• S (press/hold) will scroll upward through the Minute Set Points in 1 minute increments at a rate of 8 per second.

• S (< 2 sec) will step upward through the Set Points one at a time.

• A (< 2 sec) will save the Minute setting and ﬂash the Second digits.

• S (press/hold) will scroll upward through the Second Set Points in 1 second increments at a rate of 8 per second.

• S (< 2 sec) will step upward through the Set Points one at a time.

• A (< 2 sec) will save the Seconds setting and revert to the CDT Status screen, with OFF ﬂashing in place of SEt.

• S (< 2 sec) will toggle from OFF to ON, starting countdown.

• M (2 sec), or no button press for 2 min, will revert to FREE SURF Main.

Once set ON, the CDT will run in the background (on surface and during dives) until turned OFF, or it counts down to 0:00 at which time the alarm will strike with 0:00 ﬂashing (Fig. 103). Upon entry into Dive Mode the CDT will continue to run in the background and can be viewed as an ALT screen and turned Off and On.

Fig. 97 - FREE SURF MAIN

Fig. 99 - FREE SURF ALT 2

Fig. 98 - FREE SURF ALT 1

Fig. 103 - FREE SURF MAIN

(during CDT Alarm)

Fig. 101 - CDT STATUS

(On, Running)

Fig. 102 - SET FREE CDT

Fig. 100 - CDT STATUS

(Off, not set)

Page 38

AMPHOS DC MANUAL

FREE ELAPSED DIVE TIME (EDT) ALARM

The Free EDT Alarm is factory set for 30 seconds. When set On, the audible will sound 3 short beeps and the graphic EDT and Time digits will ﬂash every 30 seconds.

• A + S (2 sec), while viewing FREE SURF Main, will access Set Free EDT Alarm.

> The EDT Alarm can only be Set while on the Surface and cannot be changed during a Dive.

SET FREE EDT ALARM, information includes (Fig. 103) -

> Graphic OFF (or ON) ﬂashing. > Graphic 30 with sec icon and graphic EDT.

• S (< 2 sec) will toggle between OFF and ON.

• A (< 2 sec) will save the setting and access Set DA 1.

• M (2 sec), or if no button is pressed during a period of 2 minutes, operation will revert to FREE SURF Main.

FREE DEPTH ALARMS (DA)

Free mode features 3 Depth Alarms (DAs) that can be Set at progressively deeper Depths and turned OFF/ON.

> If Alarm 1 is set OFF, then Alarms 2 and 3 will be disabled. > If Alarm 2 is set OFF, Alarm 3 will be disabled.

When each alarm Depth set is reached during a dive, 3 short beeps will sound 3 times and the graphic DA1 (DA2, DA3) and Depth digits will ﬂash.

• A (< 2 sec), while viewing Set Free EDT Alarm to access Set DA1 (Depth Alarm 1).

SET FREE DA1, information includes (Fig. 104) -

> Graphic DA1. > Set Point OFF (or ON) ﬂashing. > Depth digits, ﬂashing if ON is selected, with MAX and FT (or M) icons.

• S (< 2 sec) will step through selections OFF, ON, and SEt.

• A (< 2 sec) will save the selection.

> If OFF or ON is saved, operation advances to Set DA2. > If SEt is selected, the Depth digits will ﬂash allowing them to be set.

• S (hold) will scroll upward through the Depth Set Points from 30 to 330 FT (9 to 99 M) in increments of 10 FT (1 M) at a rate of 8 per second.

• S (< 2 sec each time) will step upward through the Set Points one at a time.

• A (< 2 sec) will save the setting (Depth digits solid) and ﬂash the graphic SEt allowing ON or OFF to be selected.

• M (2 sec), or if no button is pressed during a period of 2 minutes, operation will revert to FREE SURF Main.

SET FREE DA2 & DA3 >> are similar to Set DA1.

The set range for DA2 begins 1 increment deeper than the Depth value set for DA1 and the set range for DA3 begins 1 increment deeper than the Depth value set for DA.

When DA1 (or DA2) is set Off, a message (Fig. 105) will ﬂash for 5 seconds when an attempt is made to set DA2 (or DA3) On.

<< Upon descent to 5 FT (1.5 M) for 5 seconds, operation will enter FREE Dive Mode. >>

FREE DIVE MAIN, information includes (Fig. 106) -

> EDT (min:sec) with DIVE icon. > Current Depth with FT (or M) icon. > NDC Time (min) with NDC and min icons. > Temperature with ° icon and graphic F (or C). > NIBG with N2 icon, if any nitrogen after NORM or FREE dives.

• A (< 2 sec) to access ALT 1.

• L (press) will activate Backlight.

FREE DIVE ALT 1 (CDT), information includes (Fig. 107) -

> Graphic ON (or OFF). > Remaining CD Time (min:sec) with icon if On and a CD is in progress; 0:00 if On and no time remains. If OFF, the CD Time

previously set will be displayed indicating that it is set and ready to Start.

> Graphics CDT.

• S (< 2 sec) to toggle ON/OFF (Start/Stop countdown).

• A (< 2 sec) to access ALT 2.

• If no button is pressed during a period of 10 seconds, operation will revert to FREE Dive Main.

• L (press) to activate Backlight.

Fig. 103 - SET EDT ALARM

Fig. 104 - SET DEPTH

ALARM

Fig. 106 - FREE DIVE MAIN

Fig. 105 - SET DEPTH

ALARM MESSAGE

Fig. 107 - FREE DIVE ALT 1

Page 39

AMPHOS DC MANUAL

FREE DIVE ALT 2, information includes (Fig. 108) -

> Max Depth with MAX and FT (or M) icons. > Time of Day (hr:min).

• A (< 2 sec) to revert to the Main, or after 5 seconds if A is not pressed.

• L (press) to activate Backlight.

FREE DIVE ALARMS

Free Dive alarms sound 3 short beeps (1 or 3 times) as an indication that an event is occurring and as a reminder to view the display to identify an event. The audible cannot be silenced using a button.

As the Audible sounds, a graphic identifying the event will ﬂash in place of Temperature.

Free Dive alarms are separate and unaffected by NORM/GAUG mode alarm settings, and the Alarms that occur in those modes are separate and unaffected by Free Dive alarms.

FREE CDT ALARM

When the Free CDT decreases to 0:00 (min:sec), 3 short beeps will sound 3 times during which 0:00 with min and sec icons will ﬂash in place of Depth and NDC, and the graphic CDT will ﬂash in place of Temperature (Fig. 109).

FREE EDT ALARM

When the Free EDT Alarm is set ON, 3 short beeps will sound at each 30 second interval during which the EDT digits will ﬂash and the graphic EDT will ﬂash in place of Temperature (Fig. 110).

FREE DEPTH ALARMS (DA)

When Depth reaches the DA1 Set Point, 3 short beeps will sound 3 times during which the Depth digits will ﬂash and the graphic DA1 will ﬂash in place of Temperature (Fig. 111).

The audible and ﬂashing will be repeated when Depth reaches the DA 2 and DA 3 Set Points when they are set On.

If Ascent is made above a Free Depth Alarm Set Point and then a descent is made below it, the respective Alarm (DA) will reset and sound again.

FREE NIBG ALARM

While operating in FREE mode, residual nitrogen remaining from dives conducted within the past 24 hours, including those from NORM, is displayed as the NIBG.

When nitrogen loading increases to the caution level (4 NIBG segments), 3 short beeps will sound 3 times during which the 4 NIBG segments will ﬂash and the graphic NIBG will ﬂash in place of Temperature (Fig. 112).

In the event that nitrogen loading increases to the Deco level, operation will enter Violation Gauge Mode for 24 hours.

ENTRY INTO DECO (VIOLATION)

Upon entry into Deco, 3 short beeps will sound 3 times during which the full NIBG will ﬂash, the Up Arrow icon with graphic UP will ﬂash, the graphic VIOL will ﬂash in place of Temperature, and NDC will be displayed as 0 min (Fig. 113).

After the audible is silenced, the NIBG and NDC will be removed, and Temperature will be restored. The Up Arrow icon and graphic UP will remain on ﬂashing until on the surface.

Upon surfacing, the Up Arrow icon and graphic UP will be removed. The graphic VIOL will alternate with FREE with operation reverting to Violation Gauge Mode for 24 hours with access to Watch Mode allowed. Access to NORM or GAUG will be blocked.

Fig. 109 - CDT ALARM

Fig. 110 - EDT ALARM

Fig. 111 - DEPTH ALARM

Fig. 112 - NIBG ALARM

Fig. 113 - VIOLATION (DECO)

Fig. 108 - FREE ALT 2

Page 40

AMPHOS DC MANUAL

ADDITIONAL INFORMATION PERTAINING TO FREE DIVE MODE

Although breathing apparatus is not utilized for FREE Dive activities, nitrogen tissue loading remains a factor. Nitrogen loading is calculated based upon a ﬁxed FO2 of AIR. Since a user has the option of alternating between NORM (SCUBA) and FREE Dive activities within a 24 hour period, nitrogen calculations and the displayed value of NDC Time are carried over from one operating mode to the other, which permits the user to maintain awareness of nitrogen absorption and off gassing status.

The mathematical model currently used in the AMPHOS is based on no decompression/decompression multilevel repetitive dive schedules. This algorithm does not take into account the physiological changes associated with the high pressures that competitive type Free diving can expose a diver to.

WARNINGS:

• Ensure that you know which Operating Mode is selected (NORM, GAUG, or FREE) prior to commencing any dive.

• Conducting Free dives within a 24 hour period after conducting SCUBA dives, combined with the effects of multiple rapid Free Dive ascents, increases your risk of decompression sickness. Such activities may result in accelerated entry into decompression which could cause serious injury or death.

• Combining competitive type Free dive activities that involve multiple descents/ascents with activities utilizing SCUBA during the same 24 hour period is not recommended. Presently, there is no data relating to such activities.

• It is highly recommended that anyone planning to become involved in competitive type Free dive activities obtain proper instruction and training from a recognized Free Diving trainer. It is imperative that the physiological affects be understood and the diver is physically prepared.

Page 41

AMPHOS DC MANUAL

REFERENCE

Page 42

AMPHOS DC MANUAL

CARE AND CLEANING

Protect your AMPHOS from shock, excessive temperatures, exposure to chemicals, and tampering. Protect the lens against scratches with a Instrument Lens Protector. Small scratches will naturally disappear underwater.

• Soak and rinse the AMPHOS in fresh water at the end of each day of diving, and check to ensure that the areas around the Low Pressure (Depth) Sensor (Fig. 114a), PC Interface Data Port (Fig. 114b), and Buttons are free of debris or obstructions.

• To dissolve salt crystals, use lukewarm water or a slightly acidic bath (50% white vinegar/50% fresh water). After removal from the bath, place the AMPHOS under gently running water and towel dry before storing.

• Transport your AMPHOS system cool, dry, and protected.

INSPECTIONS AND SERVICE

Your AMPHOS should be inspected annually by an Authorized Sherwood Dealer who will perform a factory prescribed function check and inspection for damage or wear. To keep the 2 year limited warranty in effect, this inspection must be completed one year after purchase (+/- 30 days).

Sherwood recommends that you continue to have an inspection performed every year to ensure it is working properly. The costs of annual inspections are not covered under the terms of the 2 year limited warranty.

To Obtain Service:

Take your AMPHOS to an Authorized Sherwood Dealer.

AMPHOS BATTERY REPLACEMENT

NOTE: The procedures that follow must be closely adhered to. Damage due to improper Battery replacement is not covered by the product's warranty.

The Battery Compartment should only be opened in a dry and clean environment with extreme care taken to prevent the entrance of moisture or dust.

As an additional precautionary measure, to prevent formation of moisture in the Battery Compartment, it is recommended that the Battery be changed in an environment equivalent to the local outdoor temperature and humidity (e.g., do not change the Battery in an air conditioned environment then take it outside during a hot sunny day).

Inspect the Buttons, Lens, and Housing to ensure they are not cracked or damaged. If there is any sign of moisture in the AMPHOS, DO NOT attempt to use it for diving (NORM, GAUG, or FREE) until it receives proper factory service by Sherwood.

NOTE: When the old battery is removed, settings and calculations for repetitive dives will be retained in non volatile memory for subsequent operations.

CAUTION: Damage due to improper Battery replacement is not covered by the product's warranty.

Battery Removal

• Locate the Battery Compartment on the back of the unit.

• Rotate the Battery Cover clockwise 10 degrees using the special Battery Cover Tool provided (Fig. 115), or -

by pushing the lower portion to the left while pushing the upper portion to the right using your ﬁngers (Fig. 116).

• Lift the Cover with O-ring up and away from the Housing.

• Using care not to damage the Battery Contact (Fig. 117a), slide the Battery up and out of the left side of the Battery Compartment.

• Discard the Battery according to local regulations governing disposal of Lithium batteries.

CAUTION: DO NOT allow a metal object to short circuit the top of the Battery which is positive (+) to the negative ( - ) contact of the Battery Compartment.

Inspection

• Closely check all of the sealing surfaces for any signs of damage that might impair proper sealing.

• Inspect the Buttons, Lens, and Housing to ensure they are not cracked or damaged.

• Remove the Battery Cover O-ring and inspect it for any signs of deterioration or deformity. DO NOT use tools to remove the O-ring.

• To ensure proper sealing, O-ring replacement is highly recommended each time a Battery is replaced.

• Closely examine the Battery Cover and Housing for any signs of damage that might prevent proper sealing.

• Closely examine the inside of the Battery Compartment for any signs of corrosion indicating entrance of moisture into the unit.

WARNING: If damage or corrosion is found, return your AMPHOS to an Authorized Sherwood Dealer, and DO NOT attempt to use it until it has received factory prescribed service.

Battery Installation

• Slide a new 3 volt type CR2430 Lithium Battery, negative side down into the cavity of the compartment. Slide it in from the left side (Fig. 118) and ensure that it slides under the contact clip on the lower/right rim of the cavity.

• Lightly lubricate the new Cover O-ring with silicone grease and place it on the inner rim of the Battery Cover. Ensure that it is evenly seated (Fig. 119).

Fig. 114 - CASE BACK

Fig. 115 - BATTERY COVER

REMOVAL (Tool)

Fig. 116 - ALTERNATE

COVER REMOVAL

Fig. 117 - AMPHOS BAT-

TERY REMOVAL

Fig. 118 - BATTERY

INSTALLATION

Fig. 119 - COVER O-RING

Page 43

AMPHOS DC MANUAL

NOTE: The Cover O-ring must be a genuine Sherwood part that can be purchased from an Authorized Sherwood Dealer. Use of any other O-ring will void the warranty.

• Carefully place the Battery Cover (with O-ring) into position on the rim of the Battery Compartment, then press it evenly and completely down into place.

• Maintain the Cover securely in place and turn it counter clockwise 10 degrees using the Cover tool (Fig. 120), or by pushing the lower portion to the right while pushing the upper portion to the left using your ﬁngers (Fig. 121).

Testing

• Activate the unit and observe the LCD is consistently clear and sharp in contrast throughout the screen.

• Set the Watch functions.

• Verify all Set Points prior to diving.

• If any portions of the display are missing or appear dim, or if a Low Battery condition is indicated, return your AMPHOS to an Authorized Sherwood Dealer for a complete evaluation before attempting to use it.

ALTITUDE SENSING AND ADJUSTMENT

Prior to the ﬁrst dive of a series of repetitive dives, Altitude (i.e., Ambient Pressure) is measured upon activation of Dive Surface Mode and every 15 minutes until a dive is made or operation reverts to Watch Default Time.

> While it is operating in Watch mode after a dive, measurements are taken every 15 minutes during the 24 hour period after

surfacing.

> Measurements are only taken when the unit is dry. > Two readings are taken, the second reading 5 seconds after the ﬁrst. The readings must be within 1 foot (30 cm) of each

other to record that Ambient Pressure as the current Altitude.

The Mathematical Model in the AMPHOS accounts for the reduced No Deco Dive Times (NDLs) available based on National Oceanic and Atmospheric Administration (NOAA) guidelines.

When diving in high altitude waters from 3,001 to 14,000 feet (916 to 4,270 meters), the AMPHOS automatically adjusts to these conditions providing corrected Depth, reduced No Deco Dive Times, and reduced Oxygen Accumulation Times at Altitude intervals of 1,000 feet (305 meters).

No adjustments are made during any time that the Wet Contacts are wet.

At an elevation of 3,001 feet (916 meters), Depth Calibration automatically changes from feet of seawater to feet of fresh water. This is the ﬁrst adjustment to the Algorithm.

When the Conservative Factor feature is set On, allowable dive times are calculated based upon the next higher 3,000 foot (915 meter) Altitude. All adjustments for Altitudes greater than 11,000 feet (3,355 meters) are then made to allowable dive times for 14,000 feet (4,270 meters). If the Conservative Factor is set On while at Sea Level, calculations are based upon an Altitude of 6,000 feet.

The AMPHOS will not function as a Dive Computer above 14,000 feet (4,270 meters).

UPLOADING SETTINGS AND DOWNLOADING DATA

The AMPHOS is conﬁgured with a Data Port that enables it to be connected to a PC USB port using a special Interface Cable available as a separate option.

A USB Driver is provided as part of the interface system, a separate option.

The Settings Upload portion of the program can be used to set/change Main Time, Date, Set A group (Alarms), and Set U group (Utilities). The Set F group (FO2) and FREE Mode Alarms must be entered using the AMPHOS's button controls.

Information available for retrieval (Download) from the AMPHOS to the PC Download portion of the program includes dive number, surface interval time, maximum depth, elapsed dive time, start date, start time, lowest temperature underwater, sampling rate, dive proﬁle, Set Points, NiBG, O2BG, and Gas Switching events.

The AMPHOS checks for the presence of an interface device connection to the Data Port once every second while in Watch Default Time mode. Checks are not made if the Wet Activation contacts are wet. Upon sensing an interface connection, the requesting device (PC) connects to the AMPHOS and is prepared for Upload of settings or Download of data which are then initiated using the PC program.

Prior to attempting to Download data from your AMPHOS or Upload Settings to it, review the Help section of the interface program. Recommended is to print those sections of Help that you consider appropriate for your Interface activities.

Fig. 120 - BATTERY COVER

INSTALLATION

Fig. 121 - ALT BATTERY

COVER INSTALLATION

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AMPHOS DC MANUAL

ERROR (RESET DURING A DIVE)

If for any reason, the AMPHOS shuts Off then turns On again for any reason during any Dive, the message ERR (Error) will be displayed with the Up Arrow and current Depth.

If this occurs, it is highly recommended that you terminate the dive and begin a safe ascent to the surface.

Upon surfacing, and any time thereafter, when access to Dive Computer Operating Mode is attempted from Watch Mode, only the message ERR will be displayed.

No Dive Computer Modes/screens will be accessible.

If this occurs, the AMPHOS must be returned to the factory for evaluation/service prior to any further use for diving activities.

ERROR DURING A DIVE

ERROR AFTER SURFACING

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AMPHOS DC MANUAL

CAN BE USED AS

• Watch

• Air Computer

• Nitrox Computer

• Digital Depth Gauge/Timer

• Free Dive Depth Gauge/Timer

NO DECOMPRESSION MODEL Basis:

• Modied Haldanean Algorithm

• 12 tissue compartments

Data Base:

• Diving Science and Technology (DSAT) - Rogers/Powell

Performance:

• Tissue compartment halftimes (mins.) Spencer’s “M” values 5, 10, 20, 40, 80, 120, 160, 200, 240, 320, 400, 480

• Reciprocal subsurface elimination

• 60 minute surface credit control for compartments faster than 60 minutes

• Tissue compartments tracked up to 24 hours after last dive

Decompression Capabilities (stop ceilings):

• 10, 20, 30, 40, 50, and 60 FT (3, 6, 9, 12, 15, and 18 M)

Altitude Algorithm:

• Based on NOAA tables

Oxygen Exposure Limits:

• Based on NOAA tables

WATCH MODES

• Default Time (selected for current location) >> ALT (Altitude, Temp, Date) >> Set - - Date Format, Time Format, Time, Date

• Alternate Time (remote location) >> Set by hour differential

• Countdown Timer >> Off, On, Set

• Chronograph (Stop Watch/Lap Timer) >> Start, Stop, Lap Recall, Reset

• Daily Alarm >> Off, On, Set

DIVE COMPUTER SURFACE SEQUENCE/MODES

• NORM >> GAUG >> FREE Surface Main

• SURF ALT (Altitude, Temp, Time)

• Plan (30 to 190 FT, 9 to 57 M) - - NORM only

• Time to Fly - - NORM/GAUG

• Time to Desaturate - - NORM only

• Dive Log, History - - NORM/GAUG

• Set - - FO2, Alarms, Utilities - NORM/GAUG

NORM/GAUG SET MODES

• Set F Group (FO2 items):

• FO2 GAS 1 (Air, 21 to 50%)

• FO2 GAS 2 (Air, 21 to 100%)

• FO2 Default (Off/On)

• Set A Group (Alarms):

• Audible (Off/On)

• Depth (30 to 330 FT, 9 to 99 M)

• Elapsed Dive Time (:10 to 3:00 hr:min)

• NIBG (1 to 5 segments)

• Dive Time Remaining (5 to 20 min)

• PO2 (1.20 to 1.60 ATA)

SPECIFICATIONS

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AMPHOS DC MANUAL

SPECIFICATIONS (CONTINUED)

• Set U Group (Utilities):

• Wet Activation (Off/On)

• Units of Measure (Imperial/Metric)

• No Deco Deep Stop (Off/On)

• No Deco Safety Stop (Off/On)

• Conservative Factor (Off/On)

• Backlight Duration (Off, 5, 10 sec)

• Sampling Rate (2, 15, 30, 60 sec)

NUMERIC DISPLAYS: Range: Resolution:

• Time of Day 0:00:00 to 23:59:59 hr:min:sec 1 second

• Temperature 0 to 140°F (-9 to 60°C) 1°

• Watch CDT 23:59 to 0:00 hr:min 1 minute

• Chronograph 0:00:00.00 to 9:59:59.99 .01 second hr:min:sec .01 sec

• PC Countdown 120 to 0 sec 1 second

• Surface Interval 0:00 to 23:59 hr:min 1 minute

• Time to Fly 23:50 to 0:00 hr:min* 1 minute (* starting 10 min after the dive)

• Time to Desaturate 23:50 max to 0:00 hr:min* 1 minute (* starting 10 min. after the dive)

• Dive Number 0 to 24 1

• Depth (Current, Max) 0 to 330 FT (99.9 M) 1 FT (0.1 M )

• Gas 1 FO2 Set Point Air, 21 to 50 % 1 %

• Gas 2 FO2 Set Point Air, 21 to 100 % 1 %

• PO2 Value 0.00 to 5.00 ATA .01 ATA

• DTR (NDC) 0 to 199 min 1 minute

• Deep Stop Time 2:00 to 0:00 min:sec 1 second

• Safety Stop Time 3:00 to 0:00 min:sec 1 second

• Deco Stop Time 0:00 to 1:59 hr:min 1 minute

• Deco TAT 0 to 199 min 1 minute

• EDT 0:00 to 9:59 hr:min 1 minute

• Free Dive Number 0 to 99 1

• Free Surface Interval 0:00 to 59:59 min:sec 1 second 1:00 to 23:59 hr:min 1 minute

• Free CDT 59:59 to 0:00 min:sec 1 second

• Free EDT 0:00 to 59:59 min:sec 1 second

• Depth Out of Range => 330 FT (99.9 M)

• Violation Countdown 23:50 to 0:00 hr:min (after surfacing)

BAR GRAPHS

Nitrogen Bar Graph:

segments

• No Deco Normal zone 3

• No Deco Caution zone 1

• Deco Warning zone 1

Oxygen (O2) Bar Graph: segments

• Normal zone 3

• Caution zone 1

• Danger zone 1

Ascent Rate Indicator: 60 FT (18 M) & Shallower Deeper than 60 FT (18 M) segments FPM MPM segments FPM MPM 0 0 - 10 0 - 3 0 0 - 20 0 - 6

• Normal 1 11 - 25 3.5 - 7.5 1 21 - 50 6.5 - 15

• Caution 2 26 - 30 8 - 9 2 51 - 60 15.5 - 18

• Too Fast (ashing) 3 (all) > 30 > 9 3 (all) > 60 > 18

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AMPHOS DC MANUAL

OPERATIONAL PERFORMANCE

Function: Accuracy:

• Depth ±1% of full scale

• Timers 1 second per day

Dive Counter:

• NORM/GAUG displays Dives #1 to 24.

• FREE displays #1 to 99 (0 if no dive made yet).

• Resets to Dive #1, upon diving (after 24 hours with no dives).

NORM/GAUG Dive Log Mode:

• Stores 24 most recent NORM/GAUG dives in memory for viewing.

• After 24 dives, adds 25th dive in memory and deletes the older dive.

Altitude:

• Operational from sea level to 14,000 feet (4,270 meters) elevation

• Measures ambient pressure every 30 minutes in Watch Mode, and every 15 minutes while in NORM/GAUG/FREE Surface Modes.

• Does not measure ambient pressure when wet.

• Compensates for Altitudes above sea level beginning at 3,001 feet (916 meters) elevation and every 1,000 feet (305 meters) higher.

Conservative Factor:

• Reduces NORM/FREE NDLs to those for the Altitude 3,000 feet (915 meters) higher.

Power:

• Battery (1) 3 vdc, CR2430, Lithium battery

• Shelf life Up to 7 years (when shipped from factory in Deep Sleep mode)

• Replacement User replaceable (annual recommended)

• Use Life 1 year or 300 dive hours if (2) 1 hour dives per dive day

Battery Indicator:

• Warning - - icon on solid at 2.75 volts, Battery change recommended

• Alarm - - icon on ashing at 2.50 volts, change the Battery

Dive Computer Mode Activation:

• Manual - - push button (recommended), required if Wet Activation is set OFF.

• Automatic - - by immersion in water (if set ON)

• Cannot be manually activated deeper than 4 FT (1.2 M), if Wet Activation is set OFF.

• Cannot operate as a Dive Computer at elevations higher than 14,000 feet (4,270 meters)

• Reverts to Watch Default Time if no dive is made within 2 hours after entry into a Surface Mode.

• Reverts to Watch Default Time 10 minutes after dive.

Operating Temperature:

• Out of the water - - between 20 °F and 140 °F (-6 and 60 °C).

• In the water - - between 28 °F and 95 °F (-2 and 35 °C).

• At extremely low temperatures, the LCD may become sluggish, but this will not affect it's accuracy.

• If stored or transported at temperatures below freezing, you should warm the unit and its battery with body heat before diving.

Storage Temperature:

• Out of the water (in storage case provided - - between 14 °F and 158 °F (-8 and 70 °C).

PC requirements:

• IBM®, or compatible, Personal Computer with Mouse, USB Port, CD drive, and printer

• Intel® Pentium 200 MHz or better microprocessor

• Microsoft® Windows® XP, Vista, or 7

• Super VGA card or compatible video graphics adaptor (256 color or greater) with a minimum 800 X 600 pixel screen area of display settings

• 20MB of available hard drive storage

• 16MB of available RAM

SPECIFICATIONS (CONTINUED)

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AMPHOS DC MANUAL

NO DECOMPRESSION LIMITS AT ALTITUDE (IMPERIAL)

Altitude> 0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 11000 12000 13000 Depth 30 4:20 4:20 3:35 3:21 3:07 2:55 2:45 2:36 2:28 2:21 2:15 2:10 2:04 1:58 40 2:17 2:17 1:53 1:43 1:36 1:30 1:25 1:20 1:16 1:12 1:09 1:06 1:03 1:01 50 1:21 1:21 1:07 1:03 1:00 0:58 0:55 0:52 0:48 0:45 0:43 0:41 0:39 0:37 60 0:57 0:57 0:46 0:43 0:40 0:38 0:36 0:34 0:33 0:31 0:30 0:29 0:28 0:27 70 0:40 0:40 0:33 0:31 0:30 0:28 0:27 0:26 0:24 0:23 0:22 0:20 0:19 0:18 80 0:30 0:30 0:26 0:24 0:23 0:21 0:20 0:19 0:18 0:17 0:16 0:16 0:14 0:13 90 0:24 0:24 0:20 0:19 0:18 0:17 0:16 0:15 0:14 0:13 0:12 0:11 0:10 0:10 100 0:19 0:19 0:16 0:15 0:14 0:13 0:12 0:11 0:10 0:10 0:09 0:09 0:08 0:08 110 0:16 0:16 0:13 0:12 0:11 0:10 0:09 0:09 0:08 0:08 0:08 0:07 0:07 0:07 120 0:13 0:13 0:10 0:09 0:09 0:08 0:08 0:08 0:07 0:07 0:07 0:06 0:06 0:06 130 0:11 0:11 0:09 0:08 0:08 0:07 0:07 0:07 0:06 0:06 0:06 0:06 0:05 0:05 140 0:09 0:09 0:07 0:07 0:07 0:06 0:06 0:06 0:06 0:05 0:05 0:05 0:05 0:05 150 0:08 0:08 0:07 0:06 0:06 0:06 0:05 0:05 0:05 0:05 0:05 0:04 0:04 0:04 160 0:07 0:07 0:06 0:06 0:05 0:05 0:05 0:05 0:05 0:04 0:04 0:04 0:04 0:04 170 0:07 0:07 0:05 0:05 0:05 0:05 0:04 0:04 0:04 0:04 0:04 0:04 0:04 0:03 180 0:06 0:06 0:05 0:05 0:05 0:04 0:04 0:04 0:04 0:04 0:04 0:03 0:03 0:03

190 0:05 0:05 0:05 0:04 0:04 0:04 0:04 0:04 0:04 0:03 0:03 0:03 0:03 0:03

NO DECOMPRESSION LIMITS AT ALTITUDE (METRIC)

Altitude> 0 305 610 915 1220 1525 1830 2135 2440 2745 3050 3355 3660 3965 Depth 9 4:43 4:43 3:51 3:37 3:24 3:10 2:58 2:48 2:39 2:31 2:24 2:18 2:12 2:07 12 2:24 2:24 2:03 1:52 1:44 1:37 1:30 1:25 1:21 1:17 1:13 1:10 1:07 1:04 15 1:25 1:25 1:10 1:06 1:03 1:00 0:57 0:55 0:52 0:49 0:46 0:43 0:41 0:39 18 0:59 0:59 0:49 0:45 0:42 0:40 0:38 0:36 0:34 0:32 0:31 0:30 0:29 0:28 21 0:41 0:41 0:34 0:33 0:31 0:29 0:28 0:27 0:26 0:24 0:23 0:21 0:20 0:19 24 0:32 0:32 0:27 0:26 0:24 0:22 0:21 0:20 0:19 0:18 0:17 0:16 0:15 0:14 27 0:25 0:25 0:21 0:19 0:18 0:17 0:16 0:16 0:14 0:13 0:12 0:12 0:11 0:10 30 0:20 0:20 0:17 0:16 0:15 0:13 0:12 0:12 0:11 0:10 0:10 0:09 0:09 0:08 33 0:17 0:17 0:13 0:12 0:11 0:11 0:10 0:09 0:09 0:08 0:08 0:08 0:07 0:07 36 0:14 0:14 0:11 0:10 0:09 0:09 0:08 0:08 0:07 0:07 0:07 0:06 0:06 0:06 39 0:11 0:11 0:09 0:08 0:08 0:07 0:07 0:07 0:06 0:06 0:06 0:06 0:05 0:05 42 0:09 0:09 0:08 0:07 0:07 0:07 0:06 0:06 0:06 0:05 0:05 0:05 0:05 0:05 45 0:08 0:08 0:07 0:06 0:06 0:06 0:06 0:05 0:05 0:05 0:05 0:05 0:04 0:04 48 0:07 0:07 0:06 0:06 0:06 0:05 0:05 0:05 0:05 0:04 0:04 0:04 0:04 0:04 51 0:06 0:06 0:06 0:05 0:05 0:05 0:05 0:04 0:04 0:04 0:04 0:04 0:04 0:03 54 0:06 0:06 0:05 0:05 0:05 0:04 0:04 0:04 0:04 0:04 0:04 0:03 0:03 0:03

57 0:05 0:05 0:05 0:04 0:04 0:04 0:04 0:04 0:04 0:03 0:03 0:03 0:03 0:03

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AMPHOS DC MANUAL

WARNING: If your AMPHOS stops working for any reason while operating as a Dive Computer, it is important that you have anticipated this possibility and are prepared for it. This is an important reason for not pushing the no decompression and oxygen exposure limits, and a critical reason to avoid entering decompression. If you dive in situations where your trip would be ruined or your safety would be jeopardized by losing the use of your AMPHOS, a backup instrument system is highly recommended.

INSPECTION / SERVICE RECORD

AMPHOS Serial Number: ___________________________________________________________________________________________________

AMPHOS Firmware Rev: ___________________________________________________________________________________________________

Date of Purchase: ___________________________________________________________________________________________________

Purchased from: ___________________________________________________________________________________________________

Below to be ﬁlled in by an Authorized Sherwood Dealer:

Date Service Performed Dealer/Technician

Page 50

AMPHOS DC MANUAL

AMPHOS

DIVE COMPUTER

MANUAL

Sherwood Amphos User guide

Specifications and Main Features

Frequently Asked Questions

User Manual