HOBO
MX
Soil
Moisture
(MX2306)
and
MX
Soil
Moisture
and
Temperature
(MX2307)
Data
Logger
Manual
1
‐
508
‐
759
‐
9500
(U.S.
and
International)
2
www.onsetcomp.com
1
‐
800
‐
LOGGERS
(U.S.
only)
Time
Accuracy
±1
minute
per
month
0°
to
50°C
(32°
to
122°F)
Battery
Type
2/3
AA
3.6
Volt
lithium,
user
replaceable
Battery
Life
2
years,
typical
with
logging
interval
of
1
minute
and
Bluetooth
Always
On
enabled;
5
years,
typical
with
logging
interval
of
1
minute
and
Bluetooth
Always
On
disabled.
Faster
logging
intervals
and
statistics
sampling
intervals,
burst
logging,
remaining
connected
with
the
app,
excessive
downloads,
and
paging
may
impact
battery
life.
Memory
110,000
measurements,
maximum
(472
KB)
Full
Memory
Download
Time
Approximately
60
seconds;
may
take
longer
the
further
the
device
is
from
the
logger
Dimensions
Logger
housing:
10.8
x
5.08
x
2.24
cm
(4.25
x
2.0
x
0.88
in.)
Soil
moisture
sensor:
7.5
x
5.1
x
2.4
cm
(2.95
x
2.02
x
0.95
inches)
Soil
moisture
sensor
needle
length:
5.4
cm
(2.13
inches)
Soil
moisture
sensor
needle
diameter:
0.32
cm
(0.13
inches)
Temperature
sensor
(MX2307)
diameter:
0.53
cm
(0.21
in.)
Sensor
cable
length:
2
m
(6.56
ft)
Weight
MX2306:
229
g
(80
oz)
MX2307:
267
g
(94
oz)
Materials
Logger:
Acetal,
silicone
gasket,
stainless
‐
steel
screws
Soil
Moisture
Sensor:
ASA
plastic
body
with
polyurethane
epoxy
filling
and
stainless
‐
steel
pins
Temperature
Sensor
(MX2307):
Stainless
‐
steel
waterproof
tip
Cable:
PVC,
UV
resistant
and
rodent
repellent
(soil
moisture
sensor
cable)
Environmental
Rating
Logger:
‐
25
to
60°C
(
‐
13
to
140°F);
weatherproof;
NEMA
6
and
IP67
Soil
Moisture
sensor
and
cable:
‐
40
to
60°C
(
‐
40
to
140°F)
Temperature
sensor
and
cable
(MX2307):
Immersion
in
water
up
to
50°C
(122°F)
for
1
year
The
CE
Marking
identifies
this
product
as
complying
with
all
relevant
directives
in
the
European
Union
(EU).
The
UKCA
marking
identifies
this
product
as
complying
with
all
relevant
directives
in
the
UK
Declaration
of
Conformity.
See
last
page
*For
additional
accuracy,
t
he
sensor
data
can
be
post
‐
calibrated
for
a
particular
soil
by
applying
a
calibration
equation
to
the
data
exported
from
the
app.
Logger
Components
and
Operation
Mounting
Holes:
Use
the
holes
at
the
top
and
bottom
of
the
logger
to
mount
it
(see
Deploying
and
Mounting
the
Logger
).
Alarm
LED:
This
LED
blinks
red
every
4
seconds
when
an
alarm
is
tripped
(unless
Show
LED
is
disabled
as
described
in
Configuring
the
Logger
).
Status
LED:
This
LED
blinks
blue
every
4
seconds
when
the
logger
is
logging
(unless
Show
LED
is
disabled
as
described
in
Configuring
the
Logger
).
If
the
logger
is
waiting
to
start
logging
because
it
was
configured
to
start
“On
Button
Push”
or
with
a
delayed
start,
it
will
blink
every
8
seconds.
Start
Button:
Press
this
button
to
wake
up
the
logger;
both
the
alarm
and
status
LEDs
will
blink.
Once
the
logger
is
awake,
press
this
button
to
move
it
to
the
top
of
the
devices
list
in
the
app.
Press
this
button
for
3
seconds
to
start
or
stop
the
logger
when
it
is
configured
to
start
or
stop
“On
Button
Push”
(see
Configuring
the
Logger
).
Both
LEDs
will
blink
four
times
when
you
press
the
button
to
start
or
stop
logging.
Press
this
button
for
10
seconds
to
reset
a
password
(see
Setting
a
Password
).
MX2307
model
shown
Alarm
LED
Mounting
Holes
Start
Button
External
Sensor
Status
LED
