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HOBO
MX
CO
2
Data
Logger
(MX1102A)
Manual
1
‐
800
‐
LOGGERS
8
www.onsetcomp.com
4.
Enable
the
Low
Alarm
if
you
want
an
alarm
to
trip
when
the
sensor
reading
falls
below
the
low
alarm
value.
Drag
the
slider
to
the
reading
that
will
trip
the
alarm
or
type
a
specific
reading.
5.
Set
the
duration
before
an
alarm
is
tripped
and
select
one
of
the
following:
Cumulative.
The
alarm
will
trip
once
the
sensor
reading
is
out
of
the
acceptable
range
for
the
selected
duration
any
time
during
logging.
For
example,
if
the
high
alarm
is
set
to
85°F
and
the
duration
is
set
to
30
minutes,
then
the
alarm
will
trip
once
the
sensor
readings
have
been
above
85°F
for
a
total
of
30
minutes
since
the
logger
was
configured.
Consecutive.
The
alarm
will
trip
once
the
sensor
reading
is
out
of
the
acceptable
range
continuously
for
the
selected
duration.
For
example,
the
high
alarm
is
set
to
85°F
and
the
duration
is
set
to
30
minutes,
then
the
alarm
will
only
trip
if
all
sensor
readings
are
85°F
or
above
for
a
continuous
30
‐
minute
period.
6.
Repeat
steps
2–5
for
any
other
sensors
if
desired
(tap
Done
or
Save
in
the
app
first).
7.
Enable
Audible
Alarms
if
you
want
a
beep
to
sound
on
the
logger
every
30
seconds
when
the
sensor
alarm
trips
(in
the
app,
enable
this
in
the
configuration
settings
screen;
in
HOBOware,
select
the
Use
Audible
Alarm
checkbox
in
the
Configure
Alarms
window).
The
beeping
will
continue
until
the
alarm
is
cleared
from
the
software,
a
button
on
the
logger
is
pressed,
or
7
days
have
passed.
Battery
life
will
be
slightly
reduced
when
this
setting
is
enabled.
It
is
recommended
that
you
only
enable
this
feature
if
you
have
regular
access
to
the
logger
so
that
you
can
easily
turn
off
the
beeping.
8.
Select
one
of
the
following
options
for
when
to
clear
the
alarm
symbol
that
appears
on
the
LCD
(in
the
app,
enable
this
in
the
configuration
settings
screen;
in
HOBOware,
select
the
checkbox
in
the
Configure
Alarms
window).
Logger
reconfigured
or
relaunched.
The
alarm
icon
will
remain
visible
on
the
LCD
until
the
next
time
the
logger
is
reconfigured.
Sensor
is
in
limits.
The
alarm
icon
will
remain
visible
on
the
LCD
until
the
sensor
reading
returns
to
the
normal
range
between
any
configured
high
and
low
alarm
limits.
Alarm
button
is
pressed.
The
alarm
icon
will
remain
visible
until
you
press
the
Clear/Next
button
on
the
logger.
9.
In
the
app:
Tap
Start
in
HOBOmobile
or
in
HOBOconnect.
In
HOBOware:
Click
OK
in
the
Configure
Alarms
window
and
then
click
Start
in
the
Launch
Logger
window
when
ready.
Notes
about
alarms:
The
alarm
icon
will
be
illuminated
on
the
logger
LCD
when
the
alarm
trips.
You
can
also
press
the
Clear/Next
button
on
the
logger
to
view
the
farthest
out
‐
of
‐
range
value
during
the
deployment.
Alarm
limits
for
temperature
and
RH
sensors
are
checked
every
15
seconds.
The
CO
2
alarm
limits
are
checked
every
15
seconds
if
the
logger
is
powered
by
USB
cable
or
every
5
minutes
if
it
is
powered
by
batteries.
If
you
are
configuring
a
CO
2
sensor
alarm
for
a
battery
‐
powered
logger,
it
is
recommended
that
the
duration
you
select
is
divisible
by
5
and
a
minimum
of
5
minutes.
For
USB
‐
powered
loggers,
CO
2
alarms
will
not
be
tripped
for
the
first
15
seconds
after
logging
begins
as
the
CO
2
sensor
requires
a
15
‐
second
warmup
period.
The
actual
values
for
the
high
and
low
alarm
limits
are
set
to
the
closest
value
supported
by
the
logger.
In
addition,
alarms
can
trip
or
clear
when
the
sensor
reading
is
within
the
resolution
specifications.
When
you
read
out
the
logger,
alarm
events
can
be
displayed
on
the
plot
or
in
the
data
file.
See
Logger
Events
.
Once
cleared,
an
audible
alarm
will
start
beeping
again
if
the
sensor
values
go
out
of
the
normal
range.
Even
if
an
audible
alarm
is
cleared,
a
visual
alarm
may
remain
on
the
logger
LCD
and
in
the
app
(if
applicable)
depending
on
the
settings
selected
for
maintaining
visual
alarms
or
because
the
alarm
condition
may
still
be
in
effect.
In
addition,
an
audible
alarm
will
continue
beeping
when
the
sensor
values
have
returned
to
the
normal
range
until
it
is
cleared.
Although
an
audible
alarm
and
a
visual
alarm
can
occur
at
the
same
time
when
a
sensor
alarm
is
tripped,
they
are
cleared
in
different
ways.
The
audible
alarm
can
be
cleared
from
within
the
software,
a
button
on
the
logger
is
pressed,
or
7
days
have
passed.
Meanwhile,
a
visual
alarm
is
cleared
as
determined
by
the
setting
selected
for
maintaining
an
alarm
in
the
software.
This
means
you
could
clear
a
beeping
audible
alarm
and
the
visual
alarm
will
remain
on
the
LCD
and
in
the
app
(if
applicable)
until
the
logger
is
reconfigured,
the
sensor
is
in
limits,
or
the
alarm
button
is
pressed
‐‐
whichever
setting
you
selected.
If
the
logger
was
configured
to
stop
logging
with
a
button
push,
any
tripped
alarms
will
be
cleared
automatically
when
logging
is
stopped
and
no
Alarm
Cleared
event
will
be
logged
in
the
data
file.
Burst
Logging
Burst
logging
is
a
logging
mode
that
allows
you
to
set
up
more
frequent
logging
when
a
specified
condition
is
met.
For
example,
a
logger
is
recording
data
at
a
5
‐
minute
logging
interval
and
burst
logging
is
configured
to
log
every
30
seconds
when
the
temperature
rises
above
85°F
(the
high
limit)
or
falls
below
32°F
(the
low
limit).
This
means
the
logger
will
record
data
every
5
minutes
as
long
as
the
temperature
remains
between
85°F
and
32°F.
Once
the
temperature
rises
above
85°F,
the
logger
will
switch
to
the
faster
logging
rate
and
record
data
every
30
seconds
until
the
temperature
falls
back
to
85°F.
At
that
time,
logging
then
resumes
every
5
minutes
at
the
normal
logging
interval.
Similarly,
if
the
temperature
falls
below
32°F,
then
the
logger
would
switch
to
burst
logging
mode
again
and
record
data
every
30
seconds.
Once
the
temperature
rises
back
to
32°F,
the
logger
will
then
return
to
normal
mode,
logging
every
5
minutes.
To
set
up
burst
logging:
1.
In
the
app:
Connect
to
the
logger
and
tap
Configure
in
HOBOmobile
or
tap
in
HOBOconnect.