Overview
Measures and transmits temperature, relative humidity, and light intensity data wirelessly. Includes an external analog input to attach a variety of additional sensors.
This self-contained, Bluetooth-enabled, wireless data logger lets you use your mobile device or Windows computer and Onset’s free HOBOconnect app to access data, at any time, when within 100 feet of the logger. Configure the logger, read out data, view data in graphs, check the operational status of loggers, configure alarm notifications, and share data files – with no dedicated equipment beyond a mobile device or laptop.
Purchase an MX Data Plan to get more out of your data and access it from anywhere using the LI-COR Cloud software platform (formerly HOBOlink)! You can also purchase the MX Gateway station, which automatically sends your logger’s data to LI-COR Cloud.
Features
- Bluetooth communication for wireless data offload
- 16-bit resolution for highly-accurate measurements
- Stores 1.9 million measurements for longer deployments between offloads
- New Self-Describing sensors with automatic configuration for fast deployment
- Compatible with existing sensors for a wide range of indoor monitoring
- Audible and visual LCD-screen alarms notify you if sensor becomes unplugged or a reading exceeds set thresholds
Specifications
Temperature Sensor (MX1104)
Range
-20° to 70°C
-4° to 158°F
Accuracy
±0.20°C from 0° to 50°C
±0.36°F from 32° to 122°F
Resolution
0.002°C at 25°C
0.004°F at 77°F
Drift
<0.1°C (0.18°F) per year
RH Sensor* (MX1104)
Range
0% to 100% at -20° to 70°C (-4° to 158°F); exposure to conditions above 95% may temporarily increase the maximum RH sensor error by an additional 1%
Accuracy
±2.5% from 10% to 90% (typical) to a maximum of ±3.5% including hysteresis at 25°C (77°F); below 10% and above 90% ±5% typical
Resolution
0.01%
Drift
<1% per year typical
Response Time (MX1104)
Temperature
11 minutes in air moving 1 m/s (2.2 mph)
RH
30 seconds to 90% in airflow of 1 m/s (2.2 mph)
Light Sensor (M1104)
Range
0 to 167,731 lux
15,582 lum/ft2
Accuracy
±10% typical for direct sunlight (see Light Measurement on page 4 for more details)
| Logger with Cable Type | SD-MA-420 or CABLE-4-20mA | SD-VOLT-2.5 or CABLE-2.5-STEREO | SD-VOLT-05 or CABLE- ADAP5 | SD-VOLT-10 or CABLE-ADAP10 | SD-VOLT-24 or CABLE-ADAP24 |
| Measurement Range | 0 to 20.1 mA | 0 to 2.5 V | 0 to 5.0 V | 0 to 10 V | 0 to 24 V |
| Accuracy | ±0.001 mA ±0.2% of reading | ±0.1 mV ±0.1% of reading | ±0.2 mV ±0.3% of reading | ±0.4 mV ±0.3% of reading | ±1.0 mV ±0.3% of reading |
| Resolution | 0.3 µA | 40 µV | 80 µV | 160 µV | 384 µV |
Logger
Operating Range
-20° to 70°C
-4° to 158°F
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
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
Restart Mode
Push button
Time Accuracy
±1 minute per month at 25°C
77°F
Battery Type
Two AAA 1.5 V alkaline batteries, user replaceable
Battery Life
1 year, typical with logging interval of 1 minute and Bluetooth Always On enabled; 2 years, typical with logging interval of 1 minute and Bluetooth Always On disabled; and temperatures between 0° and 50°C (32° and 122°F). Faster logging intervals and statistics sampling intervals, burst logging, remaining connected with the app, excessive downloads, and paging may impact battery life.
Memory
4 MB (1.9 million measurements, maximum)
Full Memory Download Time
Approximately 4 to 15 minutes depending on the mobile device; may take longer the further the device is from the logger
LCD
LCD is visible from 0° to 50°C (32° to 122°F); the LCD may react slowly or go blank in temperatures outside this range
Size
11.28 x 5.41 x 2.92 cm
4.44 x 2.13 x 1.15 in.
Weight
123 g
4.34 oz
Environmental Rating
IP54
