HOBO U14 Data Logger User Manual
6
a.
Enable
Sensor
Alarms.
To
enable
a
sensor
alarm,
select
the
desired
sensor
in
the
Channel
box,
and
then
select
the
check
box
for
the
High
Alarm
and/or
the
Low
Alarm.
Enter
a
value
to
define
the
alarm
threshold.
You
can
enter
a
value
in
the
box
or
use
the
sliders.
(If
you
enter
values
manually,
the
software
may
adjust
them
slightly
to
the
nearest
values
supported
by
the
logger.)
You
can
also
set
the
number
of
samples
(30
seconds
per
sample)
that
must
be
displayed
before
the
alarm
will
be
triggered.
b.
Set
Number
of
Samples.
To
avoid
unintended
activation
of
the
relay
contact,
set
the
number
of
samples
to
allow
for
anticipated
breaches
of
the
alarm
threshold.
If
the
alarm
is
tripped
and
the
number
of
samples
is
set
to
more
than
1,
the
LCD
will
indicate
Alert
Delayed
.
If
the
measurement
is
still
out
of
range
when
the
number
of
samples
is
reached,
the
relay
contact
will
be
activated.
Note
about
Avoiding
Unintended
Relay
Activation
.
In
some
applications,
the
environment
in
which
the
logger
is
launched
is
in
immediate
violation
of
the
desired
alarm
limit
and
will
cause
an
unintended
opening
or
closing
of
the
contact
relay.
For
example,
setting
an
upper
alarm
limit
of
+32°F
for
a
freezer
application
and
then
launching
the
logger
in
a
room
at
room
temperature
will
cause
an
immediate
alarm
trigger.
In
this
situation,
enable
a
Delayed
Launch
or
select
a
number
of
samples
that
will
result
in
a
long
enough
delay
to
allow
time
to
transport,
mount,
and
stabilize
the
logger
in
the
desired
location.
Other
causes
of
invalid
alarms
would
be
freezer
doors
being
opened
frequently
or
defrost
cycles.
To
avoid
these,
set
the
number
of
samples
to
allow
for
small
periods
of
time
where
the
value
is
outside
the
range,
but
where
the
alarm
will
not
be
tripped
unless
the
value
is
outside
the
range
for
a
significant
number
of
samples.
c.
Low
Battery
Alarm.
Select
the
Battery
Alarm
checkbox
to
enable
the
Battery
Alarm,
which
will
trigger
if
the
battery
drops
to
0%.
d.
Alarm
Reset.
Select
whether
the
alarm
will
be
deactivated
when
the
Host
has
relaunched
the
logger
or
when
the
sensor
reading
has
returned
within
limits.
e.
Set
Relay
Contact.
If
you
are
using
an
external
device
that
will
be
triggered
by
an
alarm
(such
as
a
Remote
Alarm
or
Automatic
Dialer),
set
the
desired
default
relay
contact
state
to
either
Normally
Closed
(relay
opens
during
an
alarm
condition,
which
is
the
default)
or
Normally
Open
(relay
closes
during
an
alarm
condition)
The
ARA
Remote
Alarm
can
be
set
to
Normally
Closed
or
Normally
Open
(see
remote
device
User’s
Manuals
for
more
details).
NOTE
:
The
AVD
‐
45
Automatic
Dialer
requires
the
logger’s
contacts
to
be
set
to
Normally
Closed.
f.
Test
the
Relay
Alarm.
Use
the
Test
Set
Alarm
button
to
test
the
relay
alarm
function.
When
you
click
the
Test
Set
Alarm
button,
the
logger
will
activate
the
alarm
and
change
the
condition
of
the
contact
closure.
When
you
click
the
Test
Set
Alarm
button,
it
changes
to
the
Test
Clear
Alarm
button.
Click
the
Test
Clear
Alarm
button
to
deactivate
the
alarm.
NOTE
:
When
testing
the
alarm
with
the
AVD
‐
45
Automatic
Dialer,
Onset
recommends
that
you
maintain
the
alarm
for
up
to
7
minutes
to
ensure
that
the
AVD
‐
45
Automatic
Dialer
completes
its
dial
‐
out
sequence
(see
AVD
‐
45
Automatic
Dialer
User’s
Manual
for
details).
8.
Click
the
Launch
button
in
HOBOware
to
launch
the
HOBO
U14.
NOTE
:
If
you
remove
the
external
sensor
on
the
U14
‐
002
model
after
logging
starts,
you
will
need
to
relaunch
the
logger
if
you
reconnect
a
sensor.
9.
Disconnect
the
HOBO
U14
from
the
computer
by
unplugging
the
USB
cable.
10.
Transport
the
logger
to
deployment
site.
11.
Mount
the
logger.
The
HOBO
U14
is
designed
for
a
non
‐
condensing,
non
‐
corrosive
environment.
Make
sure
the
logger
is
installed
in
a
location
where
it
will
remain
dry.
Some
of
the
external
sensors
can
be
placed
in
harsher
environments
(see
the
sensor
manual
for
specifications).
a.
Mark
the
wall
for
the
placement
of
the
two
mounting
screws
2.5
cm
(1
inch)
apart
(vertically).
b.
Screw
in
mounting
screws,
leaving
a
gap
between
the
wall
and
the
head
of
the
screw
of
about
0.5
cm
(3/16
in.).
c.
Attach
logger
by
aligning
it
with
the
screws,
and
then
push
in
and
down
to
lock
in
place.
12.
If
you
have
an
External
Sensor
model
(U14
‐
002),
mount
the
External
Sensors
(see
the
sensor
user
manual).