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HOBO® MX Temp/RH Data Logger (MX1101) Manual 

17840-U 

The HOBO MX Temp/RH data logger records and transmits temperature and relative humidity 
(RH) in indoor environments with its integrated sensors. This Bluetooth® Low Energy (BLE)-
enabled logger is designed for wireless communication with a phone, tablet, or computer. 
Using the HOBOconnect® app, you can easily configure the logger and then download logged 
data to view or export for further analysis. The logger can calculate minimum, maximum, 
average, and standard deviation statistics and can be configured to trip audible or visual alarms 
at thresholds you specify. The logger also supports burst logging in which data is logged at a 
different interval when sensor readings are above or below certain limits. This compact data 
logger also has a built-in LCD screen to display the current temperature, relative humidity, 
logging status, battery use, memory consumption, and more. 

Specifications 

Temperature Sensor 

 

Range 

-20° to 70°C (-4° to 158°F) 

Accuracy 

±0.21°C from 0° to 50°C (±0.38°F from 32° to 122°F), see Plot A 

Resolution 

0.024°C at 25°C (0.04°F at 77°F), see Plot A 

Drift 

<0.1°C (0.18°F) per year 

RH Sensor* 

 

Range 

1% to 90% (non-condensing) 

Accuracy 

±2% from 20% to 80% typical to a maximum of ±4.5% including 
hysteresis at 25°C (77°F); below 20% and above 80% ±6% typical 

Resolution 

0.01% 

Drift 

<1% per year typical 

Response Time 

 

Temperature 

7:30 minutes in air moving 1 m/s (2.2 mph) 

RH 

20 seconds to 90% in airflow of 1 m/s (2.2 mph) 

Logger 

 

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) 

Logger Operating Range 

-20° to 70°C (-4° to 158°F); 0 to 95% RH (non-condensing) 

Logging Rate 

1 second to 18 hours 

Logging Modes 

Fixed interval (normal, statistics) or burst 

Memory Modes 

Overwrite when full or stop when full 

Start Modes 

Immediate, push button, date and time, or next interval 

Stop Modes 

When memory is full, push button, date and time, or after a set 
logging period 

Restart Mode 

Push button 

Time Accuracy 

±1 minute per month at 25°C (77°F), see Plot B 

Battery Life 

1 year, typical with logging interval of 1 minute. Faster logging and/or 
statistics sampling intervals, entering burst logging mode, and 
remaining connected with the app affects battery life. Excessive 
readouts, audible alarms, and paging all affect battery life. Visual 
alarms and other events can have a marginal effect on battery life. 

Battery Type 

Two AAA 1.5 V alkaline batteries, user replaceable 

Memory 

128 KB (84,650 measurements, maximum) 

Full Memory Download Time 

Approximately 60 seconds; may take longer the further the device is 
from the logger 

*Per RH sensor manufacturer data sheet 

 

 

HOBO MX Temp/RH  
Data Logger 

Models: MX1101 

MX1101-01 (Japan 
and Korea) 

Included Items: 

 

Command™ strip 

 

Double-sided tape 

 

Hook & loop strap 

 

Two AAA 1.5 V alkaline 
batteries 

Required Items: 

 

HOBOconnect app 

 

Mobile device with 
Bluetooth and iOS, 
iPadOS®, or Android™, or a 
Windows computer with a 
native BLE adapter or 
supported BLE dongle 

 

 

Summary of Contents for MX1101

Page 1: ...s 2 2 mph RH 20 seconds to 90 in airflow of 1 m s 2 2 mph Logger Radio Power 1 mW 0 dBm Transmission Range Approximately 30 5 m 100 ft line of sight Wireless Data Standard Bluetooth Low Energy Blueto...

Page 2: ...taneously for 3 seconds to reset a logger password Alarm Stats Button Press this button for 1 second to switch between statistics alarm readings and the current sensor readings as applicable or to sil...

Page 3: ...ing the logger deployment Press the Alarm Stats button to view this reading Press the Alarm Stats button again to cycle through any statistics defined above and ultimately back to the current sensor r...

Page 4: ...u can then filter the list of devices to show only loggers marked as favorites Make the logger beep one time to help you locate it HELLO also appears on the LCD when the logger is paged Update the fir...

Page 5: ...d Press the start button on the logger if you set it up to start logging with a button push Deploy the logger using the mounting materials see Mounting the Logger After logging begins you can read out...

Page 6: ...ns to fixed mode logging every 5 minutes Note Sensor alarms statistics and the Stop Logging option Never Stop Overwrites Old Data are not available in burst logging mode To set up burst logging 1 Tap...

Page 7: ...or a minute and use the 12 samples to record the resulting statistics at each 1 minute logging interval Note that the faster the sampling rate the greater the impact on battery life Because measuremen...

Page 8: ...ation Remove the battery immediately and dry the circuit board Note Static electricity may cause the logger to stop logging The logger has been tested to 8 KV but avoid electrostatic discharge by grou...

Page 9: ...his device may not cause harmful interference and 2 this device must accept any interference received including interference that may cause undesired operation FCC Caution Any changes or modifications...

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