Hobo Pendant MX Temp, Pendant MX Temp/Light User Manual

HOBO® Pendant® MX Temp (MX2201) and

W

Temp/Light (MX2202) Logger Manual

HOBO Pendant MX loggers measure temperature (MX2201) or temperature/light (MX2202) in
indoor and outdoor environments. Designed for durability, these compact, waterproof loggers
can be used in numerous applications, including fresh and salt water. The loggers are
Bluetooth® Low Energy-enabled for wireless communication with a mobile device. Using the
HOBOmobile® app, you can easily configure the loggers, download logged data to your phone
or tablet, or automatically upload the data to HOBOlink® for further analysis. You can also
configure the loggers to calculate statistics, set up alarms to trip at specific thresholds, or
enable burst logging in which data is logged at a faster interval when sensor readings are above
or below certain limits.

MX2201 Model Shown

HOBO Pendant MX
Logger

Models:

• MX Temp (MX2201)

• MX Temp/Light

(MX2202)

Required Items:

• HOBOmobile app

• Device with iOS or

Android™ and
Bluetooth

Accessories:

• Solar radiation shield
(RS1 or M-RSA)

• Mounting bracket for
solar radiation shield
(MX2200-RS­BRACKET)

• Replacement O-rings
(MX2201-02-ORING)

Specifications

Temperature Sensor (MX2201 and MX2202)

Range -20° to 70°C (-4° to 158°F) in air

Accuracy ±0.5°C from -20° to 70°C (-4° to 158°F)

Resolution 0.04°C (0.072°F)

Drift <0.1°C (0.18°F) per year

Response Time 17 minutes typical to 90% in air moving 1 m/s, unmounted

Light Sensor (MX2202)

Range 0 to 167,731 lux (15,582 lum/ft2)

Accuracy ±10% typical for direct sunlight (see Light Measurement on page 2 for

Logger

Logger Operating Range -20° to 70°C (-4° to 158°F) in air

Buoyancy (Fresh Water) 2 g (0.07 oz) positive

Waterproof To 30.5 m (100 ft)

Radio Power 1 mW (0 dBm)

Transmission Range Approximately 30.5 m (100 ft) line-of-sight

Wireless Data Standard Bluetooth Low Energy (Bluetooth Smart)

Logging Rate 1 second to 18 hours

Time Accuracy ±1 minute per month at 25°C (77°F)

Battery CR2032 3V lithium, user replaceable

Battery Life 1 year typical at 25°C (77°F) with logging interval of 1 minute and

Memory 96,000 measurements

Full Memory Download
Time

Wetted Materials Polypropylene case, EPDM O-ring

Dimensions 3.35 x 5.64 x 1.6 cm (1.32 x 2.22 x 0.63 inches)

eight 12.75 g (0.45 oz)

-20° to 50°C (-4° to 122°F) in water

7 minutes typical to 90% in stirred water, unmounted

more details)

Bluetooth Always Off disabled in software.

2 years typical at 25°C (77°F) with logging interval of 1 minute and
Bluetooth Always Off enabled in software.

Faster logging intervals and statistics sampling intervals, burst logging,
remaining connected with the app, excessive downloads, and paging may
impact battery life.

To ensure proper battery installation, see Battery Information for detailed
instructions on replacing the battery.

Approximately 45 seconds; may take longer the farther the device is
from the logger

The CE Marking identifies this product as complying with all relevant
directives in the European Union (EU).

See last page

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HOBO Pendant MX Temp (MX2201) and Temp/Light (MX2202) Logger Manual

Logger Components and Operation

Mounting
Tab

Status LED

Temperature and
Light Sensors

Alarm LED

Start
Button

MX2202 model shown

Mounting Tab: Use the tabs at the top and bottom of the

logger to mount it (see Deploying and Mounting the Logger).

Temperature and Light Sensors: The temperature sensor
(MX2201 and MX2202) and light sensor (MX2202) are located
on the right side of the logger. See Light Measurement for more
details on the light sensor.

Status LED: This LED blinks green 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 green every 8 seconds. Both this LED
and the Alarm LED will blink once when you press the start
button to wake up the logger before configuring it. If you select
Page Logger LED in the HOBOmobile app, both LEDs will be
illuminated for 5 seconds.

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).

Plot A

Light Measurement Accuracy

Although the MX2202 is factory calibrated to account for the
light attenuation of the plastic enclosure, you may notice a
significant difference in the MX2202 reading compared to a
commercially available lux meter. Ideally, a light meter’s
response should be proportional to the cosine of the angle at
which the light is incident. The MX2202 does not collect light
exactly according to this rule. Plot B illustrates the difference
between an ideal cosine response and the approximate
response of the MX2202. For example, given an incident angle
of 60°, the MX2202 response is 40% lower than the ideal
response. The MX2202 is calibrated to give best results for
direct illumination, but this is not always the case.

Start Button: Press the circle on the front of the logger case for
1 second to wake up the logger (unless Bluetooth Always Off is
disabled as described in Configuring the Logger). Both LEDs will
blink and the logger will move to the top of the loggers list in
HOBOmobile. You may need to press the button a second time
to wake up the logger if it is logging every 5 seconds or faster
and the temperature is -10°C (14°F) or below. Press this circle
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 circle to
start or stop logging. Press this circle for 10 seconds to reset a
password. Note: The circle on the front of the logger represents
the button area on the logger. You will not feel an actual button
push when you press that area; this is normal.

Light Measurement (MX2002)

The logger measures light intensity in units of lumens/ft2 or lux.
The light sensor in the MX2202 has a spectral response that
tightly matches the photopic response of the human eye. This is
shown in Plot A.

2

The light sensor has range of 0 to 167,731 lux (15,582 lum/ft
The resolution of the light measurement varies from 1 unit of
lux or lum/ft

2

in very dim light to 40 lux (4 lum/ft2) for a full

scale measurement.

).

Plot B

Getting Started

Install the HOBOmobile app to connect to and work with the
logger.

1. Download the HOBOmobile app from the App Store® or
Google Play™.

2. Open the app and enable Bluetooth in the device settings if
prompted.

3. Press the circle on the logger to wake it up.

4. Tap the HOBOs icon at the bottom of the screen. Tap the
logger in the list to connect to it.

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HOBO Pendant MX Temp (MX2201) and Temp/Light (MX2202) Logger Manual

If the logger does not appear in the list or if it is having
trouble connecting, follow these tips.

• Make sure the logger is “awake” by pressing the circle on
the case. The alarm and status LEDs will blink once when
the logger wakes up. This will also bring the logger to the
top of the list if you are working with multiple loggers.

• If the logger is currently logging at a fast interval (5
seconds or faster) and the temperature is -10°C (14°F) or
below, you may need to press the button twice before it
appears in the list.

• Make sure the logger is within range of your mobile
device. The range for successful wireless communication
in air is approximately 30.5 m (100 ft) with full line-of­sight.

• Change the orientation of your phone or tablet to ensure
the antenna in your device is pointed toward the logger.
Obstacles between the antenna in the device and the
logger may result in intermittent connections.

• If your device can connect to the logger intermittently or
loses its connection, move closer to the logger, within
sight if possible. If the logger is in water, the connection
can be unreliable. Remove it from water for a consistent
connection.

• If the logger appears in the list, but you cannot connect
to it, close HOBOmobile and power cycle the mobile
device. This forces the previous Bluetooth connection to
close.

Once the logger is connected, you can select one of the
following actions:

between the logger and the mobile device during the
firmware update, a Firmware Update Pending Status
displays for the logger in the HOBOs list. Connect to the
logger and select Restore Logger (or Update Firmware if
that option is available) to continue updating the
firmware.

Important: Before updating the firmware on the
logger, check the remaining battery level by selecting
Full Status Details and make sure it is no less than 30%.
Make sure you have the time to complete the entire
update process, which requires that the logger remains
connected to the device during the upgrade.

• Force Offload. This may appear if an error was

encountered when loading configure settings. Select this
to offload all the data on the logger before reconfiguring
it.

Configuring the Logger

Use HOBOmobile to set up the logger, including selecting the
logging interval, start and stop logging options, and configuring
alarms. These steps provide an overview of setting up the
logger. For complete details, see the HOBOmobile User’s Guide.

1. Open HOBOmobile and tap the HOBOs icon.

2. Press the circle on the logger to wake it up. This will also
bring the logger to the top of the logger list (the logger
name will turn green). Note that the current sensor
readings are displayed even when the logger is not logging.

3. Once connected, tap Configure.

• Configure. Select logger settings and load them onto the

logger to start logging. See Configuring the Logger.

• Readout. Download logger data. See Reading Out the

Logger.

• Full Status Details. Check the battery level and view the

configuration settings currently selected for the logger.

• Start Logging. Start recording data (if the logger is

configured to start “On Button Push” as described in
Configuring the Logger).

• Stop Logging. Stop the logger from recording data. This

overrides any other Stop Logging settings that may be
configured.

• Page Logger LED. Press and hold this option to illuminate

the alarm and status LEDs for 5 seconds.

• Logger Password. Create a password for the logger that

will be required if another mobile device attempts to
connect to it. To reset a password, connect to the logger,
tap Set Logger Passkey, and select Reset to Factory
Default. You can also press the circle on the logger for 10
seconds to reset the password.

• Update Firmware. When new logger firmware is

available, this action appears in the list. Select it and
follow the instructions on the screen. A logger readout
will be completed automatically at the beginning of the
firmware update process. If the connection is lost

4. Tap Name and type a name for the logger up to 20
characters (optional). Tap Done. If no name is selected, the
logger serial number is used as the name.

5. Tap Group to add the logger to the Favorites group, an
existing custom group, or create a new group name up to
20 characters (optional). Tap Done.

6. Tap Logging Interval and choose how frequently the logger
will record data.

7. Tap Start Logging and select when logging will begin:

• Now. Logging will begin immediately after tapping Start

in the Configure screen.

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