HOBO
MX
CO
2
Data
Logger
(MX1102A)
Manual
1
‐
800
‐
LOGGERS
7
www.onsetcomp.com
to
get
the
average
and
create
the
offset
from
400
ppm.
(See
the
steps
later
in
this
section
for
more
details
on
manual
calibration.)
This
is
recommended
if
the
logger
is
deployed
in
a
building
that
is
always
occupied,
if
you
want
the
logger
to
be
calibrated
more
frequently
than
every
eight
days
(the
normal
auto
calibration
schedule),
or
if
you
want
to
calibrate
the
logger
immediately
after
logging
begins.
Note:
Once
a
manual
calibration
is
performed,
the
24
‐
hour
auto
calibration
is
canceled
and
an
auto
calibration
will
be
performed
eight
days
from
the
time
the
manual
calibration
occurred.
Auto
calibration.
Use
this
option
if
you
want
the
logger
to
automatically
calibrate
within
the
first
24
hours
after
logging
begins
and
then
every
eight
days
thereafter.
The
logger
will
be
calibrated
based
on
the
average
of
the
three
CO
2
measurements
that
follow
the
lowest
CO
2
value
identified
during
the
24
‐
hour
or
8
‐
day
time
period
as
applicable.
Important:
Accurate
auto
‐
calibration
requires
the
building
or
location
where
the
logger
is
deployed
to
be
empty
at
least
once
during
the
eight
‐
day
period
(for
example,
an
empty
office
building
during
the
weekend
or
overnight
will
typically
have
background
CO
2
levels
of
400
to
450
ppm).
If
the
logger
is
deployed
in
an
area
where
the
CO
2
level
does
not
go
down
to
400
ppm
during
the
eight
‐
day
time
period,
then
manual
calibration
should
be
performed
regularly
instead
or
inaccurate
CO
2
readings
will
be
reported.
If
you
plan
on
using
auto
calibration
but
the
A
mabuilding
will
be
occupied
during
the
first
day
after
logging
begins,
then
you
can
use
the
manual
calibration
option
as
well.
You
can
manually
calibrate
the
logger
immediately
after
logging
begins
and
use
auto
calibration
thereafter.
Note:
Every
time
the
logger
is
started,
auto
calibration
will
occur
after
24
hours
and
then
again
after
eight
days
unless
a
manual
calibration
is
performed
first.
Altitude
compensation.
The
CO
2
sensor
must
compensate
for
locations
above
or
below
305
meters
(1,000
feet)
to
provide
an
accurate
reading.
You
must
enter
the
altitude
above
or
below
sea
level
in
either
meters
or
feet
when
configuring
the
logger
if
it
will
be
deployed
at
a
location
above
or
below
sea
level.
In
normal
use,
the
CO
2
measurement
will
vary
by
approximately
0.135%
of
the
reading
for
each
mbar
change
in
barometric
pressure
(the
sensor
is
calibrated
at
1,013
mbar).
Use
altitude
compensation
when
deploying
the
logger
for
the
best
CO
2
accuracy
possible.
To
access
calibration
and
altitude
compensation
settings
in
the
app:
1.
Tap
the
Devices
icon
(in
HOBOmobile,
tap
Loggers
at
the
top
of
the
screen).
Tap
the
logger
in
the
app
to
connect
to
it.
2.
Tap
Configure
in
HOBOmobile
or
tap
in
HOBOconnect.
3.
Tap
the
CO
2
sensor.
4.
Select
auto
calibration,
manual
calibration,
or
both.
5.
Select
“Altitude
Compensation”
and
enter
the
altitude
above
or
below
sea
level
where
the
logger
will
be
deployed
in
either
meters
or
feet.
In
HOBOmobile:
You
can
tap
Use
Location
if
you
want
the
location
services
within
the
phone
or
tablet
to
calculate
altitude.
6.
Tap
Done
or
Save.
7.
Tap
Start
to
load
settings
to
the
logger.
To
access
calibration
and
altitude
compensation
settings
in
HOBOware:
1.
Connect
the
logger
to
the
computer
with
the
USB
cable.
2.
From
the
Device
menu
in
HOBOware,
select
Launch.
3.
Click
the
CO
2
Settings
button.
4.
Select
auto
calibration,
manual
calibration,
or
both.
5.
Select
“Use
Carbon
Dioxide
sensor
altitude
compensation”
and
enter
the
altitude
above
or
below
sea
level
where
the
logger
will
be
deployed
in
either
meters
or
feet.
6.
Click
OK.
7.
Click
Start
in
the
Launch
Logger
window
to
load
settings
to
the
logger.
Note:
If
both
auto
calibration
and
manual
calibration
are
selected,
the
logger
will
automatically
calibrate
within
24
hours
after
logging
begins
unless
a
manual
calibration
occurs
during
that
time
period.
In
addition,
when
both
calibration
settings
are
selected,
the
eight
‐
day
calibration
cycle
will
be
reset
any
time
a
manual
calibration
is
performed.
To
manually
calibrate
the
CO
2
sensor:
Important:
If
you
do
not
follow
these
manual
calibration
instructions
as
described,
the
sensor
readings
will
be
incorrect
and
you
will
need
to
manually
calibrate
the
logger
again.
1.
Take
the
logger
outside
in
fresh
air
on
a
dry
day
where
the
carbon
dioxide
level
is
400
ppm.
You
can
also
use
an
indoor
location
for
manual
calibration
if
it
is
unoccupied
and
is
not
exposed
to
a
ventilation
system.
2.
Press
the
Calibrate
button
on
the
logger
for
5
seconds
until
it
beeps.
The
logger
will
then
calibrate
for
5
minutes.
The
CO
2
and
Calibrate
symbols
on
the
LCD
will
flash
while
the
calibration
is
underway.
A
time
‐
and
date
‐
stamped
manual
calibration
event
is
logged
in
the
data
at
the
end
of
the
5
‐
minute
calibration
sequence.
3.
Once
the
Calibration
process
is
complete,
return
the
logger
to
its
deployment
location.
Repeat
this
process
at
least
once
every
eight
days
for
best
accuracy.
Setting
up
Alarms
You
can
set
an
alarm
to
trip
on
the
logger
when
a
sensor
reading
rises
above
or
falls
below
a
specified
value.
This
can
alert
you
to
problems
so
you
can
take
corrective
action.
To
set
up
a
sensor
alarm:
1.
In
the
app:
Connect
to
the
logger
and
tap
Configure
in
HOBOmobile
or
tap
in
HOBOconnect..
In
HOBOware:
From
the
device
menu,
select
Launch.
Click
the
Alarms
button
in
the
Launch
Logger
window.
2.
Select
the
sensor
that
you
want
to
set
up
with
an
alarm
condition.
3.
Enable
the
High
Alarm
if
you
want
an
alarm
to
trip
when
the
sensor
reading
rises
above
the
high
alarm
value.
Drag
the
slider
to
the
reading
that
will
trip
the
alarm
or
type
a
specific
reading.
