Revision 1.0.4
Page 2
OM
‐
90
Series
Data
Loggers
Quick
Reference
Guide
(Models
OM
‐
91
&
OM
‐
92)
Description
The
OM
‐
90
Series
are
portable,
battery
operated,
temperature
and
humidity
data
loggers
able
to
store
65,520
samples
of
both
temperature
and
humidity
along
with
a
time
stamp.
The
data
logger
runs
off
of
a
CR2450
coin
cell
battery
that
enables
it
to
run
for
over
4
years.
This
Quick
Reference
Guide
gets
you
started
with
the
logger
with
the
most
basic
functions
to
have
you
up
and
running
with
your
logger
in
a
matter
of
minutes.
The
OM
‐
90
Series
today
comes
in
two
versions;
OM
‐
91
is
a
temperature
only
version
and
OM
‐
92
is
a
temperature
and
humidity
logger.
This
quick
reference
guide
applies
for
both
versions.
Battery
Installation
The
data
logger
runs
from
a
standard
coin
cell
battery.
We
recommend
a
CR2450
620mAH
Coin
cell
battery.
There
are
different
manufacturers
but
a
good
one
is
Panasonic
CR
‐
2450/G1AN.
You
can
find
it
easily
on
the
web
from
different
places
such
as
www.digikey.com
and
www2.mouser.com.
The
key
thing
is
to
choose
a
CR2450
battery
with
high
capacity
since
this
will
translate
into
a
longer
logger
battery
life.
First
remove
the
data
logger
cover
by
unscrewing
the
two
fastener
screws
(#1
Philips)
at
the
rear
of
the
logger.
