HOBO U14 Data Logger User Manual
10
Maintenance
Replacing
Batteries
The
HOBO
U14
requires
three
AAA
batteries.
Onset
Computer
Corporation
strongly
recommends
the
use
of
fresh
alkaline
batteries.
Batteries
should
be
replaced
when
the
BATT
LEVEL
bar
graph
is
down
to
one
segment,
which
indicates
20%
battery
life
or
less.
To
ensure
data
integrity,
use
HOBOware
to
read
out
the
logger
and
stop
logging
before
changing
batteries.
Replacing
the
Internal
RH
Sensor
(Model
U14
‐
001
Only)
The
internal
relative
humidity
sensor
in
the
U14
‐
001
logger
may
require
replacement
if
it
is
damaged
mechanically
or
by
exposure
to
condensation
or
chemicals.
The
replacement
sensor
(Part
No.
HUM
‐
RHPCB
‐
3A)
is
available
from
Onset
or
an
Onset
Authorized
Dealer
for
U14
‐
001
loggers
with
serial
numbers
above
9847173.
Note:
U14
‐
001
loggers
with
a
serial
number
below
9847173
require
a
different
replacement
sensor
(Part
No.
HUM
‐
RHPCB
‐
3).
You
can
replace
the
internal
RH
sensor
yourself
or
have
it
replaced
as
part
of
a
U14
‐
001
tune
‐
up/calibration
service
(available
from
Onset).
Contact
Onset
for
more
details.
Onset
Computer
Corporation
www.onsetcomp.com
Mailing
Address:
P.O.
Box
3450
Pocasset,
MA
02559
‐
3450
Phone:
1
‐
800
‐
LOGGERS
(1
‐
800
‐
564
‐
4377)
or
508
‐
759
‐
9500
Fax:
508
‐
759
‐
9100
Hours
of
Operation:
8
AM
to
5
PM
ET,
Monday
through
Friday
Email: