HOBO MX1102A Bluetooth Low Energy Carbon Dioxide/Temperature/Relative Humidity Data Logger

SKU: MX1102A


Onset’s HOBO MX1102A CO2 logger makes it more convenient than ever to measure and record CO2 in buildings and other non-condensing environments. It measures CO2 from 0-5,000 parts per million (ppm) and our free HOBOmobile app* allows you to access data right from your mobile phone or tablet within a 100-foot range.

The MX1102A also features a USB port so it can be used with a computer running HOBOware graphing and analysis software.


  • Wireless communication via Bluetooth Low Energy (BLE) Technology
  • Six month battery life at 5-minute COlogging rate
  • Easy to deploy and offload using free HOBOmobile App
  • Visual and audible high & low alarm thresholds
  • Self-calibrating NDIR COsensor technology ensures optimal accuracy and lower maintenance costs
  • Memory up to 84,650 measurements
  • Patented connectivity technology
temperature range

-20°C to 50°C

temperature accuracy

±0.21°C from 0°C to 50°C

temperature resolution

0.024°C at 25°C

temperature drift

<0.1°C per year

Temperature Response Time

12 minutes to 90% in airflow of 1 m/s (2.2 mph)

Relative Humidity Range

1% to 90%, non-condensing

Relative Humidity Accuracy

±2% from 20% to 80% RH typical to a maximum of ±4.5% including hysteresis at 25˚C; below 20% RH and above 80% RH ±6% typical

Relative Humidity Resolution


Relative Humidity Drift

<0.1% per year typical

Relative Humidity Response Time

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

CO2 range

0 to 5,000ppm

CO2 accuracy

±50ppm ±5% of reading at 25°C (77°F), less than 90% RH non-condensing and 1,013mbar

CO2 warm up time

15 seconds

CO2 calibration

Auto or manual to 400ppm

CO2 Non-linearity

<1% of FS

CO2 Pressure Dependence

0.13% of reading per mmHg

CO2 Operating Pressure Range

950 to 1,050mbar

CO2 Compensated Pressure Range

-305 to 5,486 m (-1,000 to 18,000 ft)

CO2 Sensing Method

Non-dispersive infrared (NDIR) absorption

CO2 Response Time

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



Radio Power

1 mW (0 dBm)

Transmission range

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

Wireless Data Standard

Bluetooth Smart (Bluetooth Low Energy, Bluetooth 4.0)

Operating range

-20° to 50°C; 0 to 95% RH (non-condensing)

Logging rate

1 second to 18 hours

Logging Modes

Fixed interval (normal, statistics) or burst

Memory Modes

Wrap when full or stop when full

Start Modes

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

Stop Modes

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

Time Accuracy

± 1 minute per month at 25°C

Power Source

4 AA 1.5 Volt batteries (user replaceable) or USB power source (5 V DC, 2 Watts)

Battery Life

6 months, typical with logging and sampling intervals of 5 minutes or slower; 6 months or less with logging and sampling intervals faster than 5 minutes while logging CO2. Entering burst logging mode will impact battery life. With HOBOmobile use, battery life can be reduced by remaining connected, excessive readouts, checking of Full Status Details, audible alarms, and paging. Visual/audible alarms and other events can have a marginal impact on battery life.


128 KB (84,650 measurements, maximum)

Download Type

USB 2.0 interface or via Bluetooth Smart


LCD is visible from 0° to 50°C; the LCD may react slowly or go blank in temperatures outside this range


7.62 x 12.95 x 4.78cm



Full Memory Download Time

20 seconds via USB; approximately 60 seconds via Bluetooth Smart, may take longer the further the device is from the logger

Environmental Rating

IP 50


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

HOBO MX1102A Data Logger Datasheet