Sherwood Scuba AMPHOS AIR 2.0 User manual

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AMPHOS AIR 2.0 DC MANUAL
© Pelagic, 2019 Doc. No. 12-79 3 9 -r01 (11/12/19 )
AMPHOS AIR 2.0
DIVE COMPUTER MANUAL

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AMPHOS AIR 2.0 DC MANUAL
© Pelagic, 2019 Doc. No. 12-79 3 9 -r01 (11/12/19 )
NOTICES, WARRANTY, MODEL .........................................................4
FEATURES & DISPLAYS .....................................................................5
CONTROL BUTTONS ......................................................................6
OPERATING MODE STRUCTURE ..................................................6
OPERATION AS A DIVE COMPUTER .............................................6
AUDIBLE ALARM.............................................................................6
BACKLIGHT .....................................................................................7
POWER SUPPLY..............................................................................7
WATCH FEATURES & DISPLAYS .......................................................8
LOCAL DEFAULT TIME ...................................................................9
MAIN TIME........................................................................................9
WATCH ALT ......................................................................................9
SET MAIN TIME................................................................................9
Set Date Format...........................................................................9
Set Hour Format .......................................................................... 9
Set Time......................................................................................10
Set Date ...................................................................................... 10
ALTERNATE TIME..........................................................................10
Set Alternate Time .....................................................................10
WATCH CDT (COUNTDOWN TIMER) STATUS.............................10
Set CDT ...................................................................................... 11
CHRONOGRAPH STATUS............................................................. 11
DAILY ALARM STATUS ................................................................. 11
Set Daily Alarm .......................................................................... 11
DIVE COMPUTER FEATURES & DISPLAYS ....................................12
BAR GRAPHS ................................................................................ 13
ALPHA/NUMERIC DISPLAYS........................................................13
DIVE COMPUTER SURFACE MODES ..............................................14
OPERATING MODES .....................................................................15
SURFACE MODE ...........................................................................15
NORM SURF MAIN.........................................................................15
NORM SURF ALT 1 ........................................................................15
NORM SURF ALT 2 ........................................................................15
BATTERY STATUS .........................................................................16
NORM/GAUG SET MODES............................................................16
Setting FO2 for Nitrox Dives ....................................................16
FO2 Set for Air ...........................................................................16
SET F GROUP (FO2)......................................................................16
Set Gas 1 FO2, PO2 Alarm........................................................16
Set Gas 2 FO2, PO2 Alarm........................................................17
Set FO2 50% Default .................................................................17
SET A GROUP (ALARMS) ............................................................. 17
Set Audible Alarm......................................................................17
Set Depth Alarm.........................................................................17
Set EDT Alarm............................................................................18
Set NIBG Alarm..........................................................................18
Set DTR Alarm ...........................................................................18
Set Turn (pressure) Alarm ........................................................18
Set End (pressure) Alarm .........................................................18
SET U GROUP (UTILITIES) ...........................................................19
Set Wet Activation .....................................................................19
Set Units.....................................................................................19
Set NORM Deep Stop ................................................................19
Set NORM Safety Stop ..............................................................19
Set Conservative Factor (CF) ...................................................19
Set Backlight Duration..............................................................19
Set Sampling Rate.....................................................................20
Set TRT 1 (2) ..............................................................................20
SERIAL NUMBER...........................................................................20
NORM PLAN MODE.......................................................................20
FLY MODE ...................................................................................... 21
DESAT MODE.................................................................................21
NORM/GAUG LOG MODE .............................................................21
HISTORY MODE.............................................................................22
NORM DIVE MODES..........................................................................23
TRANSMITTER SIGNAL RECEPTION GUIDE..............................24
POSITIONING OF THE AMPHOS AIR 2.0.....................................24
Link Interruption Underwater ...................................................24
DIVE TIME REMAINING (DTR) ......................................................25
No Deco Time Remaining (NDC)..............................................25
O2 Time Remaining (OTR)........................................................25
Air Time Remaining (ATR) ........................................................ 25
ATR Alarm .................................................................................. 25
ASCENT RATE INDICATOR (ASC)................................................25
NORM NO DECOMPRESSION DIVE MODE.................................26
NORM NO DECO MAIN..................................................................26
NORM NO DECO ALTS..................................................................26
NO DECO DEEP STOP ..................................................................26
NO DECO SAFETY STOP..............................................................27
CAUTIONARY MODES.......................................................................28
DECOMPRESSION ........................................................................29
CONDITIONAL VIOLATION (CV)...................................................29
DELAYED VIOLATION 1 (DV1)......................................................30
DELAYED VIOLATION 2 (DV2)......................................................30
DELAYED VIOLATION 3 (DV3)......................................................30
VIOLATION GAUGE MODE (VGM)................................................31
HIGH PO2 .......................................................................................31
HIGH O2..........................................................................................32
SWITCHING GAS MIXES & TRANSMITTERS ..................................33
SWITCHING (NORM)......................................................................34
GAUGE OPERATING MODE .............................................................35
SURF MAIN.....................................................................................36
SURF ALT .......................................................................................36
DIVE MAIN......................................................................................36
DIVE ALT ........................................................................................36
TRT 1 (2) SWITCH PREVIEW ........................................................37
DELAYED VIOLATION 3 (DV3)......................................................37
FREE DIVE OPERATING MODE........................................................38
SURF MAIN.....................................................................................39
SURF ALT 1 ....................................................................................39
SURF ALT 2 ....................................................................................39
FREE CDT (COUNTDOWN TIMER)............................................... 39
FREE ELAPSED DIVE TIME (EDT) Alarm .................................... 40
FREE DEPTH ALARMS (DA).........................................................40
FREE DIVE MAIN AND ALTS.........................................................40
FREE DIVE ALARMS .....................................................................41
CONTENTS

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CONTENTS (continued)
REFERENCE ......................................................................................43
CARE AND CLEANING..................................................................44
INSPECTIONS AND SERVICE.......................................................44
BATTERY REPLACEMENT............................................................44
ALTITUDE SENSING AND ADJUSTMENT....................................46
UPLOADING SETTINGS AND DOWNLOADING DATA................46
ERROR (RESET DURING A DIVE) ................................................46
NORM/GAUG ALARM SCREENS ................................................. 47
SPECIFICATIONS...........................................................................48
INSPECTION/SERVICE RECORD .....................................................52
FCC COMPLIANCE............................................................................52
• It should not be considered that the capabilities built into the AMPHOS AIR 2.0 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 AIR 2.0 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 in-
creasing the risk of pulmonary oxygen toxicity.
• The AMPHOS AIR 2.0 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 perti-
nent 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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© Pelagic, 2019 Doc. No. 12-79 3 9 -r01 (11/12/19 )
LIMITED TWO-YEAR WARRANTY
Sherwood Scuba guarantees, to the original purchaser only, that the AMPHOS AIR 2.0 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 AIR 2.0 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 registration card is not lled out completely at the time of purchase and mailed to Sherwood Scuba within 30
days of purchase, and/or if the annual inspection is not done according to this owner’s manual. This warranty is non-transferrable and applies to the original
purchaser only. All correspondence concerning this warranty must be accompanied by a copy of the original sales receipt and a copy of the owner’s portion
of the warranty registration card including the annual inspection record.
Once each year you must return the AMPHOS AIR 2.0 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 AIR 2.0. Modications or repair by anyone other than a Sherwood Sales and Service Center authorized to
service the AMPHOS AIR 2.0 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 AIR 2.0 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.
COPYRIGHT NOTICE
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 / Pelagic.
AMPHOS AIR 2.0 DC Manual, Doc. No. 12-7939
© Pelagic, 2019
TRADEMARK NOTICE
Sherwood Scuba, the Sherwood Scuba logo, and HydroGlo are registered or unregistered trademarks of Sherwood Scuba LLC. AMPHOS AIR 2.0 and
the AMPHOS AIR 2.0 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), Ascent Rate Indicator (U.S. Patent
no. 5,156,055), and Dive Computer with Free Dive Mode and/or Wireless Data Transmission (U.S. Patent no. 7,797,124).
DECOMPRESSION MODEL
The programs within the AMPHOS AIR 2.0 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 AIR 2.0 dive computer model is based upon the latest research and experiments
in decompression theory. Still, using the AMPHOS AIR 2.0, 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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FEATURES
&
DISPLAYS

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OPERATING MODE STRUCTURE
Unless it is operating in Dive Computer mode, the AMPHOS AIR 2.0 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 ac-
cessed.
When Wet Activation is set On, the AMPHOS AIR 2.0 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 AIR 2.0 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 un-
less Wet Activation is set ON.
OPERATION AS A DIVE COMPUTER
The AMPHOS AIR 2.0 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 Battery/Transmitter Status, 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 -
• Air Time Remaining (ATR) at 5 minutes, then again at 0 minutes.
• Turn Pressure at the value selected (Transmitter 1 only).
• End Pressure at the value selected (active Transmitter).
• 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 for the gas in use.
Fig. 1 - WATCH MAIN TIME
INTRODUCTION
Welcome to Sherwood and thank you for choosing the AMPHOS AIR 2.0 !
It is extremely important that you read this owner's manual in sequence and understand it completely before attempting to use the AMPHOS
AIR 2.0 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 knowl-
edge to use it.
CONTROL BUTTONS
The AMPHOS AIR 2.0 features 4 Control Buttons that allow you to select mode options and access specific information. They are also used to
link the Transmitter(s), 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
M
A
S
L
Fig. 2 - SURFACE MAINS
A
BUTTONS
B
C

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• 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.
• Loss of the active Transmitter Link signal for more than 15 seconds during a dive.
• Entry into Decompression (NORM).
• 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 AIR 2.0 is connected to a PC.
POWER SUPPLY
The AMPHOS AIR 2.0 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 AIR 2.0 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.
Transmitters (TRTs) each use (1) 3 volt, CR2 Lithium Battery. A TRT's battery should provide normal operation for 1 year or 300 dive hours.
TRTs check battery voltage when they are pressurized and will send a Low Battery signal to the Receiver in the AMPHOS AIR 2.0 when the
voltage drops below the Warning level.
• TRT Low Battery conditions are only displayed on Status screens that can be accessed from the Surface Main.
To check the condition of the AMPHOS AIR 2.0 or a TRT's Battery if NORM or GAUG Mode is selected, depress the S button for 2 seconds
while viewing the Surface Main, then release it.
• As the button is depressed, the AMPHOS AIR 2.0's Receiver will activate.
• 2 seconds later, the AMPHOS AIR 2.0's Battery status will be displayed for 3 seconds (Fig. 5), then -
if active and linked, TRT 1's Battery status will be displayed for 3 seconds (Fig. 6A), then -
if active and linked, TRT 2's Battery status will be displayed for 3 seconds, then -
the display will then revert to Surface Main.
• If a TRT is not active and linked, the message NOT AVAiL (not available) will be displayed (Fig. 6B).
Fig. 4 - LOW BATTERY
ALARM
Fig. 3 - LOW BATTERY
WARNING
a
Fig. 5 - AMPHOS AIR 2.0
BATT GOOD
Fig. 6B - NOT REPORTING
Fig. 6A - TRT BATT LOW

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WATCH
FEATURES & DISPLAYS

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LOCAL DEFAULT TIME
This is normally Watch Main Time which can interchanged with Watch Alternate Time when at a remote travel location. Watch Main must be
selected in order to access the Set Time Menu.
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.
Watch Main Time (Fig. 7) 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 (Default) >> Alternate Time >> Countdown Timer >> Chronograph >> Daily Alarm
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.
Watch Alternate Time (Fig. 8), 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.
Alternate Time (Default) >> Main Time >> Countdown Timer >> Chronograph >> Daily Alarm
To reestablish Watch Main Time as the Default and interchange it with Watch Alternate Time (when it is selected as the Default), press M (<
2 sec), then S (2 sec).
MAIN TIME, information displayed includes (Fig. 9):
> Daily Alarm icon (clock) if it is set On (Fig. 9a).
> 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. Main Time must be selected as the Watch Default Time.
WATCH ALT, information includes (Fig. 10):
> 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
Watch Main Time must be selected as the Watch Default Time in order to access these items.
> 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 AIR 2.0 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 (displaying Main Time), 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. 11).
> 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. 12).
• S (< 2 sec) will toggle between 12 and 24.
• A (< 2 sec) will save the setting and access Set Time.
Fig. 7 - MAIN TIME
Fig. 8 - ALTERNATE TIME
Fig. 9 - MAIN TIME
(12 Hour Format)
a
Fig. 10 - WATCH ALT
Fig. 11 - SET DATE FORMAT
Fig. 12 - SET HOUR FORMAT

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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. 13). 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. 14).
• 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. 15):
> 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. 16):
> 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 STATUS (COUNTDOWN TIMER), information includes (Fig. 17A/B):
> 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. 13 - SET TIME
Fig. 14 - SET DATE
Fig. 15 - ALTERNATE TIME
Fig. 16 - SET ALTERNATE
TIME
Fig. 17A - CDT STATUS
(no time set)
Fig. 17B - CDT STATUS
(running)

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Fig. 18 - SET WATCH CDT
Fig. 20 - LAP RECALL
Fig. 19A - CHRONO STATUS
(not running)
Fig. 21 - DAILY ALARM
Fig. 22 - SET DAILY ALARM
Fig. 19B - CHRONO STATUS
(Lap in progress)
sec_.01 sec hr:min
Set CDT, information includes (Fig. 18):
> 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. 19A/B):
> 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 con-
tinue 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 selectd, 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
syncronized 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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DIVE COMPUTER
FEATURES & DISPLAYS

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BAR GRAPHS
The AMPHOS AIR 2.0 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
Tank Pressure
When the AMPHOS AIR 2.0's Receiver is set ON and is active, Tank Pressure from the active Transmitter that is properly linked will be dis-
played on the NORM or GAUG Main screens (Fig. 24a).
Values of Pressure are displayed numerically from 000 PSI (00 BAR) up to 5000 PSI (345 BAR) in increments of 5 PSI (1 BAR).
Depth
During dives, the Current Depth display (Fig. 24b) 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 min-
utes!). 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
a
ASC values
Deeper than 60 FT (18 M)
Segments Ascent Rate =
Displayed FPM MPM
00 - 20 0 - 6
121-50 6.5-15
251-60 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
b
Fig. 25 - MAX DEPTH, TIME
a
Fig. 24 - PRESSURE, DEPTH
b
ab
Fig. 27 - ELEV, DATE, TEMP
Fig. 26 - NDC, EDT
Fig. 28 - DATE
a
b
a

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DIVE COMPUTER
SURFACE MODES

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DIVE COMPUTER (DC) OPERATING MODES
The AMPHOS AIR 2.0 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. 30A/B) 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 AIR 2.0 is
operating in at the time of the descent.
The AMPHOS AIR 2.0 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 depress-
ing M (2 sec).
NORM SURF MAIN, information includes (Fig. 31):
> TRT (Transmitter) Link icon, if in use, flashing during lost signal.
> 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/TRT (tank) 1 icon, 1 is the default on the surface.
> NX icon, if either gas is set for Nitrox.
> Tank Pressure with PSI (or BAR) icon, TRT 1.
> 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.
• S (2 sec) will activate the AMPHOS AIR 2.0's Receiver and access a series of screens that will indicate the Status of the system's Batteries
and Pressures of the Tanks in use.
• Each Status screen will be displayed for 3 seconds.
>> AMPHOS AIR 2.0 Battery Status, then TRT 1 Battery/Pressure, then TRT2. Operation will then revert to NORM SURF Main.
• If a Transmitter (TRT) is not active and linked to the AMPHOS AIR 2.0, a Not Available message will appear.
NORM SURF ALT 1, information includes (Fig. 32A):
> 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 bypass and revert to NORM SURF Main if set for Air..
• After 5 sec, operation will revert to NORM SURF Main.
• L (press) will activate the Backlight.
NORM SURF ALT 2, information includes (Fig. 33):
> 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. 30B - FREE SURF MAIN
Fig. 30A - GAUG SURF MAIN
Fig. 31 - NORM SURF MAIN
(post dive)
Fig. 32 - NORM SURF ALT 1
Fig. 33 - NORM SURF ALT 2
(only after Nitrox dives)

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AMPHOS AIR 2.0 BATTERY STATUS, information includes (Fig. 34):
> Graphics bAtt and AMPH (meaning AMPHOS AIR 2.0).
> Graphic Good or Lo.
> Battery icon, if a Low Battery warning condition exists, flashing if an alarm condition exists.
TRANSMITTER (TRT) STATUS, information includes (Fig. 35):
> Graphics bATT and Good (or Lo) with Tank 1 (or 2) icon.
> Tank Pressure with PSI (or BAR) icon.
- - or - -
> Graphics Not AVAIL, and TRT1 (or 2) with Tank 1 (or 2) icon, if that TRT is not in use or not reporting.
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 AIR 2.0 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. 36).
> A (< 2 sec) will then access Set FO2 Gas 1.
SET GAS 1 (FO2 & PO2 Alarm), information includes (Fig. 37):
> Graphic Air flashing, or -
. . Max Depth allowed with MAX and FT (or M) icons.
. . PO2 Alarm value with PO2 icon.
. . FO2 (numeric) value flashing.
. . Nx icon.
> Gas (tank) 1 icon.
> Graphic GAS1.
• S (hold) to scroll upward through FO2 settings from Air to 21 through 50% in 1% increments at 8/sec, stopping when the button is
released, or at 32, then at 50 (even if S is held depressed), then stop at Air (or 21 if a repetitive Nitrox dive).
• S (< 2 sec) to step upward through the Set Points one at a time.
• A + S (2 sec) to save the setting and revert to Set F.
• A (< 2 sec) to save the setting and flash the PO2 digits if Nitrox, or access Set Gas 2 if Air.
To set PO2, if flashing -
• S (< 2 sec) to step upward through the Set Points of 1.00 to 1.60 one at a time in increments of 0.10.
Fig. 36 - SET F GROUP
Fig. 35 - TRT STATUS
Fig. 37 - SET FO2 GAS 1
Fig. 34 - AMPHOS AIR 2.0
BATTERY STATUS

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• A (< 2 sec) to save the PO2 Alarm setting and access Set Gas 2.
• A + S (2 sec) to save the setting and revert to Set F.
• 2 minutes, or M (2 sec), revert to Main.
SET GAS 2 (FO2 & PO2 Alarm), information includes (Fig. 38):
> Graphic Air or OFF flashing, or -
. . Max Depth allowed with MAX and FT (or M) icons.
. . PO2 Alarm value with PO2 icon.
. . FO2 (numeric) value flashing.
. . Nx icon.
> Gas (tank) 2 icon.
> Graphic GAS2.
*OFF will prevent Gas 2 from being displayed as a switch option during dives.
• S (hold) to scroll upward through FO2 settings from Air to 21 through 100% in 1% increments at 8/sec, stopping when the button is
released, or at 32, then at 50, then at 80, then 100% (even if S is held depressed), then stop at Air (or 21 if a repetitive Nitrox dive).
• S (< 2 sec) to step upward through the Set Points one at a time.
• A + S (2 sec) to save the setting and revert to Set F.
• A (< 2 sec) to save the setting and flash the PO2 digits if Nitrox, or access Set Gas 2 if Air.
To set PO2, if flashing -
• S (< 2 sec) to step upward through the Set Points of 1.00 to 1.60 one at a time in increments of 0.10.
• A (< 2 sec) to save the PO2 Alarm setting and access Set FO2 Default.
• A + S (2 sec) to save the setting and revert to Set F.
• 2 minutes, or M (2 sec), revert to Main.
* The AMPHOS AIR 2.0 is programmed to prevent FO2 for Gas 2 from being set at a value lower than the FO2 set for Gas 1. When set-
ting FO2 for Gas 2, the lowest value available will be the Set Point of Gas 1.
SET FO2 50% DEFAULT, information includes (Fig. 39):
> 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 > Turn Pressure > End Pressure.
> A + S (2 sec), while viewing Set F, will access Set A (Fig. 40).
> A (< 2 sec) will then access Set Audible.
SET AUDIBLE, information includes (Fig. 41):
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. 42):
> 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.
Fig. 41 - SET AUDIBLE
Fig. 42 - SET DEPTH ALARM
Fig. 39 - SET FO2 DEFAULT
Fig. 40 - SET A GROUP
Fig. 38 - SET FO2 GAS 2

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SET EDT ALARM, information includes (Fig. 43):
> 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.
SET NIBG ALARM, information includes (Fig. 44):
> 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 one segment 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. 45):
> 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 Turn 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 TURN ALARM (TRT 1 only), information includes (Fig. 46):
> Graphic ON (or OFF), flashing.
> Graphic trn with Tank 1 icon.
> Pressure with PSI (or BAR) 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 End Alarm.
>> if SEt is saved, the Pressure digits flash (SEt goes solid).
• S (hold) will scroll upward from 1000 to 3000 PSI (70 to 205 BAR) in 250 PSI (5 BAR) 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 END ALARM (TRT in use), information includes (Fig. 47):
> Graphic ON (or OFF), flashing.
> Graphic End with Tank 1 and 2 icons.
> Pressure with PSI (or BAR) 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, revert to Set A.
>> if SEt is saved, the Pressure digits flash (SEt goes solid).
• S (hold) will scroll upward from 300 to 1500 PSI (20 to 105 BAR) in 100 PSI (5 BAR) 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. 44 - SET NiBG ALARM
Fig. 45 - SET DTR ALARM
Fig. 46 - SET TURN ALARM
Fig. 47 - SET END ALARM
Fig. 43 - SET EDT ALARM

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SET U GROUP (UTILITIES)
Selections >> Wet Activation > Units > Deep Stop > Safety Stop > Conservative Factor > Backlight Duration > Sampling Rate > TRT 1 > TRT 2.
> A + S (2 sec), while viewing Set A, will access Set U (Fig. 48).
> A (< 2 sec) will then access Set Wet Activation.
SET WET ACTIVATION, information includes (Fig. 49):
> 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. 50):
> FT and PSI (or BAR and 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.
SET NORM DEEP STOP, information includes (Fig. 51):
> 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 scren 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. 52):
> 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. 53):
> 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 CF is set ON, NDLs are reduced to those that would be available at the next higher 3000 foot (915 meter) Altitude.
SET BACKLIGHT DURATION, information includes (Fig. 54):
> 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.
Fig. 48 - SET U GROUP
Fig. 49 - SET WET
ACTIVATION
Fig. 50 - SET UNITS
Fig. 51 - SET DEEP STOP
Fig. 53 - SET CONSERVA-
TIVE FACTOR
Fig. 52 - SET SAFETY STOP
Fig. 54 - SET BACKLIGHT
DURATION

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SET SAMPLING RATE, information includes (Fig. 55):
> 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 access Set TRT 1.
• 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.
SET TRT 1, information includes (Fig. 56):
> Graphic OFF (or ON) flashing.
> Serial Number (Link Code), up to 6 digits.
> Graphic TRT1 with Tank 1 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 TRT 2.
>> if SEt is saved, the first (left) digit of the Link Code will flash (SEt goes solid).
• S ( < 2 sec) will step up from 0 to 9 one at a time.
• A (< 2 sec) will save the first digit and flash the second.
> Similar S & A operations will set/save the remaining digits.
> A (< 2 sec), while the last (right) digit is flashing, will save the setting (all go solid) 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.
SET TRT 2 >> is similar to Set TRT 1.
SERIAL NUMBER, information includes (Fig. 57):
> 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 AIR 2.0. 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 especially 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. 58A/B):
> 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 theo-
retical 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, NDLs are reduced to the values of the next 3000 foot (915 meter) higher
Altitude.
Fig. 56 - SET TRT
Fig. 57 - SERIAL NUMBER
(view only)
Fig. 58B - PLAN LEAD-IN
(FO2 set for Nitrox)
Fig. 55 - SET SAMPLING
RATE
Fig. 58A - PLAN LEAD-IN
(FO2 set for Air)