HOBO MX2303 Two External Temperature Sensors Data Logger

The HOBO MX2303 is a weatherproof data logger with two external temperature sensors. Leveraging Bluetooth Low Energy, the logger enables easy, fast set up and data download directly from your mobile device, and provides high-accuracy measurements in harsh outdoor environments.

Highlighted Features

Convenient wireless setup and download via Bluetooth Low Energy (100-foot range)
Retrieve data in hard-to-reach locations
Visual alarms alert you to out-of-range conditions
Compact, weatherproof housing with built-in mounting
View current data in real time with Onset¢‚¬„¢s free HOBOmobile app
Share downloaded data easily from your mobile device
Accuracy: +/- 0.2C‚°

In what environment does this data logger operate?

This data logger operates in an outdoor environment.

What measurements does this data logger support?

The MX2303 data logger supports the following measurement: Temperature

Specifications


Temperature Sensor
Range:	MX2301 and MX2305 internal sensors: -40 to 70°C (-40 to 158°F) MX2302 external temperature sensor: -40 to 70°C (-40 to 158°F) MX2303 and MX2304 external sensors: -40 to 100°C (-40 to 212°F), with tip and cable immersion in fresh water up to 50°C (122°F) for one year
Accuracy:	±0.25°C from -40 to 0°C (±0.45 from -40 to 32°F) ±0.2°C from 0 to 70°C (±0.36 from 32 to 158°F) ±0.25°C from 70 to 100°C (±0.45 from 158 to 212°F), MX2303 and MX2304 only
Resolution:	0.04°C (0.072°F)
Drift:	< 0.01°C (0.018°F) per year
RH Sensor (MX2301, MX2302 only)
Range:	0 to 100% RH, -40° to 70°C (-40° to 158°F); exposure to conditions below -20°C (-4°F) or above 95% RH 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% RH and above 90% RH ±5% typical
Resolution:	0.05%
Drift:	< 1% per year typical
Response Time: Temperature (typical, to 90% of change)	Without Solar Radiation Shield	With RS1/M-RSA Solar Radiation Shield	With RS3-B Solar Radiation Shield
MX2301 internal sensor	17 minutes in air moving 1 m/sec	24 minutes in air moving 1 m/sec	N/A
MX2302 external sensor	2 minutes, 30 seconds in air moving 1 m/sec	6 minutes in air moving 1 m/sec	5 minutes in air moving 1 m/sec
MX2303/MX2304 external sensors	3 minutes in air moving 1 m/sec; 20 seconds in stirred water	7 minutes in air moving 1 m/sec	4 minutes in air moving 1 m/sec
MX2305 internal sensor	17 minutes in air moving 1 m/sec	24 minutes in air moving 1 m/sec	N/A
Response Time: Temperature (typical, to 90% of change)	Without Solar Radiation Shield	With RS1/M-RSA Solar Radiation Shield	With RS3-B Solar Radiation Shield
MX2301 internal sensor	1 minute in air moving 1 m/sec	1 minute in air moving 1 m/sec	N/A
MX2302 external sensor	4 minutes in air moving 1 m/sec	4 minutes in air moving 1 m/sec	4 minutes in air moving 1 m/sec
Logger
Radio Power:	1mW (0 dBm)
Transmission Range :	Approximately 30.5 m (100 ft) line-of-sight
Wireless Data Standard:	Bluetooth Smart (Bluetooth Low Energy, Bluetooth 4.0)
Logger Operating Range :	40° to 70°C (-40° to 158°F)
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 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 Power Saving Mode disabled; 5 years, typical with logging interval of 1 minute and Power Saving Mode enabled. Faster logging intervals and statistics sampling intervals, burst logging, remaining connected with the app, excessive downloads, and paging may impact battery life.
Memory:	128 KB (84,650 measurements, maximum)