A&D 2 Plus User Manual
Monitor 2 Plus
Users Manual
CONTENTS
INTRODUCTION................................................2
WHAT IS A “DIVE COMPUTER”.......................2
DEFINITION OF COMPARTMENTS ............................................2
MULTI-LEVEL DIVING .................................................................2
DIVING RESPONSIBLY ...............................................................2
FEATURES OF THE M2+ ..................................2
THE COMPUTER SCREEN .........................................................2
THE ELECTRICAL CONTACTS................................................... 2
AUTOMATIC ACTIVATION ........................................................... 2
M2+ DISPLAY AND CONTACT LETTER DESIGNATIONS ........2
ACTIV A TING THE COMPUTER.........................3
CHECKING THE BA TTERY PO WER.................3
FUNCTIONS DURING THE DIVE ...................... 3
CURRENT DEPTH........................................................................3
DIVE TIME .....................................................................................3
MAXIMUM DEPTH........................................................................3
ASCENT RATE .............................................................................3
NO-STOP TIME ............................................................................. 4
DECOMPRESSION STOP INFORMATION ................................. 4
TOTAL ASCENT TIME ..................................................................4
SOS MODE ................................................................................... 4
FUNCTIONS AT THE SURFACE .......................4
WAIT MODE..................................................................................4
SURFACE MODE .......................................................................... 5
SURFACE MODE ICON................................................................5
WAIT -T O-FLY TIME.......................................................................5
DESA TURA TION TIME .................................................................5
SURFACE INTERVAL TIME ......................................................... 5
MICROBUBBLE WARNING .........................................................5
DIVING AT ALTITUDE .......................................5
ALTITUDE SECTORS...................................................................5
EXCEEDING THE AL TITUDE LIMIT ............................................6
SUMMARY OF ATTENTION MESSAGES AND
ALARMS.......................................................6
ATTENTION MESSAGES ............................................................ 6
ALARMS .......................................................................................6
OVERVIEW ...................................................................................7
DOWNLOADING THE MEMORY TO A PC ..................................7
MEMORY MODE................................................7
ACTIVATING MEMORY MODE....................................................7
SCROLLING THROUGH LOGGED DIVES..................................7
EXITING MEMORY MODE...........................................................7
PRE-DIVE PLAN MODE....................................8
OVERVIEW ...................................................................................8
ACTIVATION FROM READY-MODE ............................................8
ACTIVATION FROM SURFACE MODE .......................................8
PLANNING A DECOMPRESSION DIVE .....................................9
OVERVIEW ...................................................................................9
CARE BEFORE THE DIVE ...........................................................9
CARE DURING THE DIVE............................................................9
CARE AFTER THE DIVE ..............................................................9
ANNUAL DEALER INSPECTIONS & FACTORY SERVICE....... 9
CARE AND MAINTENANCE.............................9
HOW TO OBTAIN SERVICE .......................................................10
OPERATING TEMPERATURE ...................................................10
REPLACING THE BATTERY......................................................10
TECHNICAL SPECIFICATIONS......................10
OPERATIONAL PERFORMANCE ............................................. 10
NO-DECOMPRESSION MODEL ...............................................10
ZH-L8 ADT CALCULATION MODEL ..............10
TEMPERATURE ......................................................................... 10
ASCENT RATE AND MICROBUBBLE FORMATION ............... 10
SUMMARY....................................................... 1 0
INTRODUCTION
Congratulations on the purchase of your Monitor 2 Plus (M2+) dive
computer. Our designers have condensed important dive planning
information into a user-friendly dive instrument. By combining
graphics with bold alphanumerics, we have created an easy-to-use
computer that provides dive data at a glance.
As with all diving equipment, it is important to understand the
features and functions of the M2+. Before using the M2+, it is
essential to read this manual in its entirety. Contained within this
easy to read manual are illustrations to aid you in the complete
understanding of the computer.
Section 1 instructs you on diving with the M2+, including pre-dive
activation, descriptions of underwater displays, functions after the
dive, and diving at altitude. Section 2 shows you how to recall the
dive memory. Instructions on planning a future dive are given in
Section 3. Care & Maintenance tips are covered in Section 4. Lastly,
the reference section contains the technical specifications and a
description of the algorithm.
WHAT IS A “DIVE COMPUTER”
DEFINITION OF COMPARTMENTS
A dive computer is an instrument that mathematically simulates the
absorption and release of nitrogen by hypothetical tissue types in the
human body. These hypothetical tissues are commonly referred to as
“compartments.” Each compartment absorbs and releases nitrogen at
different rates. The M2+ tracks these compartments constantly,
providing you with up-to-the-minute decompression information.
MULTI-LEVEL DIVING
If you use, or have used, dive tables you know the total amount of
time you can stay under water is based on the maximum depth
reached during the dive. Dive tables, such as the U.S. Navy dive
tables, assume that you immediately descend to a single depth, stay
at that depth for the duration of the dive, then immediately surface
from that depth. This type of dive profile is referred to as a rectangular dive profile (figure 1). In reality, however, most recreational
divers go to the deepest depth first and make a gradual ascent to the
surface. This type of dive profile is referred to as a multilevel dive
profile (figure 2).
Multilevel diving is where the M2+ excels. By continuously calculating the nitrogen absorption/release of all the compartments, the
computer updates the amount of no-decompression time (NDT) you
have left. As you ascend to shallower depths, the computer credits
you with more allowable NDT; if you go deeper, it reduces the NDT
available.
FEATURES OF THE M2+
THE COMPUTER SCREEN
The M2+ has a large liquid crystal display (LCD) and features large
numbers and graphics. The screen is luminous for easy reading
during low light dives, including night dives and cave dives.
The illustration on the opposite page calls out each display number
or icon and provides a brief description for each one.
THE ELECTRICAL CONTACTS
All surface operations and mode changes are made by the use of four
electrical contacts placed around the M2+'s screen. These contacts
are identified as A, B, C and D (see figure below). As a rule, contact
A is always touched in conjunction with one of the other three
contacts. After entering different modes, such as Memory Mode or
Pre-Dive Planning Mode, contact B always decreases a value, and
contact C always increases a value (always in combination with A).
To make contact, simply moisten your fingertips and touch the
appropriate pair of contacts at the same time. Release the contact as
soon as the operation has been activated, usually no more than one
second.
AUTOMATIC ACTIVATION
The M2+ automatically activates and starts working as soon as it is
submerged in water. This means you can enter the water and start
diving without turning on the computer first.
Occasionally, when diving in fresh water, there is not enough
electrical conductivty in the water to complete the circuit between
contacts. If this is the case, the M2+ will activate using a secondary
pressure switch. Therefore, there may be slight delay between
entering the water and the computer going into Dive Mode.
M2+ DISPLAY AND CONTACT LETTER DESIGNATIONS
DIVING RESPONSIBLY
Figure 1
Rectangular Profile
Figure 2
Multi-Level Profile
ACTIV ATING THE COMPUTER
One of the nice features of the M2+ is that it automatically turns on
and starts working when you enter the water. However, its a good
idea to manually turn on the computer before a series of dives to
make sure it is working properly and to check the battery power. To
manually switch on the M2+, touch contacts A and D. Check the
display to make sure all the display elements are lit.
The M2+ is now in Ready Mode. The computer switches to Dive
Mode after entering the water and submerging below four feet. The
depth indication may be delayed for a few seconds.
Note: After three minutes of inactivity, the M2+ screen goes blank. This
indicates that the computer is in Sleep Mode. To "wake up" the
computer, touch contacts A & D.
DIVE TIME
Dive time, which is displayed in minutes, is the
amount of time spent below a depth of 4 feet. While
the dive time is running, the colon to the right of the
number flashes in one-second intervals. Maximum
dive time displayed is 199 minutes.
Note: If a dive lasts longer than 199 minutes, dive
time will roll over to 0 minutes.
Dive time display
MAXIMUM DEPTH
Maximum depth is the deepest depth reached
during the dive. It is only displayed when the
actual depth is more than three feet shallower
than the maximum depth.
Maximum depth
display
CHECKING THE BATTERY POWER
You can manually check the battery
power of the M2+. While in Ready
Mode or Surface Mode, touch
contacts A&D. The word "bat" will
be displayed along with the battery
power. Battery power is given as a
percentage, with 99% being the
highest percentage displayed. It is a
good idea to check the battery
power before you start a series of
dives.
FUNCTIONS DURING THE DIVE
CURRENT DEPTH
Current depth is displayed in one-foot increments down to a
maximum of 330 feet. When the depth is two feet or less, the depth
display is replaced with three dashes.
Note: Depth measurement is based on freshwater. When diving is salt
water, the depth displayed will be slightly greater than the actual depth,
depending on the salinity of the water.
ASCENT RATE
The optimal ascent rate varies between 23
and 67 ft/min. depending on the depth.
Ascent rate is displayed as a percentage of
the allowable ascent rate (rounded to the
nearest 10 %). For example, if the allowable
ascent rate at the current depth is 67 ft/min,
and you ascend at 33 ft/min, the ascent rate
will display 50%. If you ascend at 67 ft/min
the ascent rate will show 100%.
WARNING: The prescribed ascent
rate must be observed at all times!
Exceeding the prescribed ascent
rate can lead to microbubble
formation which can lead to
serious injury or death due to
decompression sickness.
If the ascent rate is 100% or more, the arrow appears. If the ascent
rate exceeds 140%, the arrow starts flashing. Also, an acoustic alarm
sounds when ascent rate is 110% or greater. The intensity of the
alarm increases as the percentage over the allowable rate increases.
Below is a summary of the ascent warnings.
Some Notes on ascent rate:
- The M2+ may require a decompression stop due to an improper
ascent rate, even if you stay within the no-stop limits.
- Decompression time necessary for the prevention of microbubbles
can increase greatly if the ascent rate is exceeded.
- At great depth, ascending too slowly may cause heightened satura-
tion of tissues and increase both decompression time and total
ascent time. At shallow depth, a slow ascent may shorten decom-
pression time because the tissues are desaturating during a shallow,
slow ascent.
- Excessive rates of longer periods are entered in the dive computer's
memory
Ascent Rate Display
Current depth display
at 100 feet
Current depth display at
2 feet or shallower
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