MARES CXR-I : How-To Guide : Page 8

2.4.

W

ARNINGS

2.7. WATER

Y

ou

can set the

computer

to fresh

water,

salt

water

or EN13319

calibration, depending on

where

you intend to dive. Setting the

wrong

water

type

entails

an

error

in

depth

measurement

of

maximum

3% (i.e. at

a

depth

of

30m/100ft,

a

computer

set to

salt

water

will show 29m/97ft in

fresh

wat

er

whereas

a

computer

set to

fresh water will

show 31m/103ft in salt water). Note that

this

does not affect the

proper functioning

of

the

computer,

since the

computer performs all

of the

calculations based

purely on

pr

es

sure

measurements.

EN13319

corresponds

to

a

water

density of 1.0197kg/l and it is used

in

European

Norm

13319.

2.13.

ERASE

DESATURATION

CXR-I allows you to

reset

the

desaturation in

the

computer.

Any

tissue

satur

ation

information

from a

recent

dive will be

reset t

o

zero and the

computer treats

the next dive

as

a non-repetitive

dive. This is

useful

when

the

computer

is

loaned

to

another

diver who

has

not dived in the last 24

hour

s.

2.4.1.

MAX

DEPTH

CXR-I allows you to set an

alarm

at a

depth

independent

of the

MOD.

The

default

value

is

OFF

.

Using the and

buttons

you can

set

it

between

10m

/

30ft and up to just shy of

the

MOD,

in 1m

/

5ft

increments.

Upon

reaching

the

depth defined in this

alarm,

the

message

MAX

DEPTH REACHED

appears

on the

screen

and

stays there

until you

ascend

above the set

limit.

2.4.2.

DIVE

TIME

CXR-I allows you to set a time

alarm,

triggering

also a warning at half of the set

time

limit. The

default

value is

OFF

.

Using

the

and

buttons,

you can set the value

betw

een

20 and 90

minutes

in

2-minute

incr

ements.

Upon

reaching

half of the set limit,

the

message

TURN AROUND

appears

and

s

t

ays

on

the display until you hit any button

t

o

acknowledge

it. Upon

reaching

the set

time

limit, the

message

TIME LIMIT

appears and

stays

on the display until you hit any button

t

o

acknowledge it.

Once inside the

menu,

you will see a

gr

aphic

representation

of the loading in all

tis

sues

of the

decompression calculation.

To

pr

e

v

ent

accidental desaturation reset,

you

must ent

er

the

security

code once you decide to

pr

oc

eed

with the

reset.

The

security

code is

1234

.

After

entering

the

security

code you will get

a

confirmation

of the

successful completion of

the

oper

ation.

2.8.

NIGHT

MODE

In this

menu

you can

select

the

NIGHT MODE

as the

default

display.

Y

ou

can also

switch

between

the two display

modes

during a

div

e

using the

Underwater

Menu

described in

section 9.9.

2.4.3.

NO STOP (TO

BE

INTRODUCED

VIA

FREE FIRMWARE UPGRADE SOON

)

When this is set to

ON

,

a warning will

alert

y

ou

when the NO STOP time

reaches

2

minut

es.

2.9.

DEEP

STOP

CXR-I

calculates

a deep

stop

for air

and

nitr

o

x

dives only. The depth is defined as

that

at

which the 5th

compartment (27-minute half

time)

switches

from

ongassing

to

offgassing.

Stopping at this depth during an

ascent

allows the

first

four

tissues

to offgas at

a

r

elativ

el

y

high

ambient pressure

(theor

etic

all

y

pr

e

v

enting

microbubble formation) without

causing excessive nitrogen uptake

in the

other

tissues.

The deep

stop,

when

calculated, is

shown in the top right

corner

of the

display,

next to the

current

depth. The deep

stop is

optional, not

carrying

it out does not

intr

oduc

e

any

penalties

and its

duration

is

NOT

included

in the total

ascent time.

This

menu

allows you turn off the

c

al

culation

and display of the deep

stop.

The

def

ault

setting

is OFF.

2.14.

ALL SILENT

MODE

In this

menu

you can

disable audible

alarms.

2.4.4.

ENTERING DECO (TO

BE

INTRODUCED VIA FREE FIRMWARE

UPGRADE

SOON)

When this is set to

ON

,

a warning will

alert

y

ou

when a

mandatory decompression stop

has

been

calculated

by

CXR-I.

2.4.5.

RGT (TO

BE

INTRODUCED VIA

FREE

FIRMWARE UPGRADE

SOON)

In

multigas

dives, when this is set to

ON

,

a

warning will

alert

you when the

RGT

reaches 3

minutes.

For single gas dives this is an

ALARM

and is always ON.

2.15.

ASCENT

VIOLA

TION

If the

ascent rate exceeds

120% of the

all

o

w

ed

value over a depth

change

of more

than

20m/66ft,

due to the

potential

of

harmful

bubbl

e

formation,

CXR-I locks the

comput

er

for 24

hours

in

order

to

pr

e

v

ent

you from diving

again. In this

menu,

you have the option

t

o

disable

the locking up of the

computer

in

the

event of an

uncontrolled

ascent.

2.5.

MUL

TIG

AS

2.10.

DECO STOP (TO

BE

INTRODUCED VIA

FREE

FIRMWARE UPGRADE

SOON)

This

menu

allows you to

choose

the depth of

the

shallowest stop

among 3m/10ft,

4.5m/15ft

and 6m/20ft.

Decompression times

incr

ease

when the

shallowest stop

is

deeper

.

2.5.1. PREDICTIVE

When set to

ON

,

CXR-I will

consider all

gases

in the

decompression

c

al

culation,

with

switches carried

out at the

MOD

of

each

gas. When set to

OFF

,

the

decompr

es

sion

calculation

will

consider

the

curr

entl

y

breathed

gas only. See Section 11 for

mor

e

information

about the

PREDICTIVE

f

eature.

The

default

value is ON.

2.11.

SECONDS (TO

BE

INTRODUCED VIA

FREE

FIRMWARE UPGRADE

SOON)

If set to

ON

,

this

menu

allows you to

add

seconds

to the dive time. Due to

spac

e

limitations,

this implies a size

reduction

of

the

information

to the right of the dive

time.

2.5.2.

ALLOW SWITCH BELOW MOD (TO

BE

INTRODUCED VIA FREE FIRMWARE

UPGRADE

SOON)

When set to

ON

,

CXR-I will allow a switch to

a

gas at a depth

deeper

than the

MOD

of the

gas

(resulting

in an

immediate

MOD

alarm).

The

default

value is ON.

2.6.

FUTURE DEC

O

In this

menu

you can define the

parameters of

the

future

deco

prediction

and of the

runaway

deco

alarm.

Refer to

section

9.3 for

mor

e

inf

ormation.

2.12.

LINKED

MAP

In this

menu,

you can

select

a map which

y

ou

can

later

on call up during the

div

e.

9

W

ARNING

-

An

uncontrolled ascent increases

y

our

risk of

decompression sickness

(DCS)

-

This

f

eatur

e

is

intended

for

v

ery

experienced divers

only, such as

div

e

instructors,

who take full

r

esponsibility

for the

consequences

of

turning

off

this

function.

W

ARNING

Disabling

audible alarms

can lead you

int

o

pot

entiall

y

dangerous situation

and

could

result

in

serious

injury or

death.

W

ARNING

Diving after having

reset

the

desatur

ation

is

e

xtr

emel

y

dangerous

and is very likely

t

o

cause serious

injury or

death.

Do not

r

eset

the

desaturation unless

you have a

v

alid

reason

to do

so.