HOBO MX2304 External Temperature Sensor Data Logger

Overview

  • The HOBO MX2304 is a weatherproof data logger with one external temperature sensor. Leveraging Bluetooth Low Energy, the logger enables easy, fast setup and data download directly from your mobile device with Onset's free HOBOconnect app. The MX2304 provides high-accuracy measurements in harsh outdoor environments. Add the MX Gateway for remote access to your data in Onset's cloud-based HOBOlink software.
  • PART#

    MX2304 Bluetooth Low Energy (BLE)

The country of origin for this product is the United States. To see the full specifications for this product, please see our product manual found under the documentation tab if available.

Temperature Sensor
RangeMX2301A and MX2305 internal sensors: -40 to 70°C (-40 to 158°F)
MX2302A 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
ResolutionMX2301A and MX2302A: 0.02°C (0.036°F)
MX2303, MX2304, and MX2305: 0.04°C (0.072°F)
Drift<0.01°C (0.018°F) per year
Relative Humidity Sensor* (MX2301A, MX2302A only)
Range0 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
Resolution0.01%
Drift<1% per year typical
Response Time (typical, to 90% of change)
TemperatureWithout Solar Radiation ShieldWith RS1/M-RSA Solar Radiation ShieldWith RS3-B Solar Radiation Shield
MX2301A
internal sensor
17 minutes in air moving 1 m/sec24 minutes in air moving 1 m/secNA
MX2302A
external sensor
3 minutes, 45 seconds in air moving 1 m/sec7 minutes, 45 seconds in air moving 1 m/sec6 minutes, 30 seconds in air moving 1 m/sec
MX2303/MX2304
external sensors
3 minutes in air moving 1 m/sec; 20 seconds in stirred water7 minutes in air moving 1 m/sec4 minutes in air moving 1 m/sec
MX2305
internal sensor
17 minutes in air moving 1 m/sec24 minutes in air moving 1 m/secNA
RHWithout Solar Radiation ShieldWith RS1/M-RSA Solar Radiation ShieldWith RS3-B Solar Radiation Shield
MX2301A
internal sensor
30 seconds in air moving 1 m/sec40 seconds in air moving 1 m/secNA
MX2302A
external sensor
15 seconds in air moving 1 m/sec30 seconds in air moving 1 m/sec30 seconds in air moving 1 m/sec
Logger
Operating Range-40° to 70°C (-40° to 158°F)
Radio Power1 mW (0 dBm)
Transmission RangeApproximately 30.5 m (100 ft) line-of-sight
Wireless Data StandardBluetooth Low Energy (Bluetooth Smart)
Logging Rate1 second to 18 hours
Logging ModesFixed interval (normal, statistics) or burst
Memory ModesWrap when full or stop when full
Start ModesImmediate, push button, date & time, or next interval
Stop ModesWhen 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 Type2/3 AA 3.6 Volt lithium, user replaceable
Battery Life2 years, typical with logging interval of 1 minute and Bluetooth Always On enabled; 5 years, typical with logging interval of 1 minute and Bluetooth Always On disabled. Faster logging intervals and statistics sampling intervals, burst logging, remaining connected with the app, excessive downloads, and paging may impact battery life.
MemoryMX2301A and MX2302A: 128 KB (63,488 measurements, maximum)
MX2303, MX2304, and MX2305: 128 KB (84,650 measurements, maximum)
Full Memory Download TimeApproximately 60 seconds; may take longer the further the device is from the logger
DimensionsLogger housing: 10.8 x 5.08 x 2.24 cm (4.25 x 2.0 x 0.88 in.)
External temperature sensor diameter: 0.53 cm (0.21 in.)
External temperature/RH sensor diameter: 1.17 cm (0.46 in.)
External sensor cable length: 2 m (6.56 ft)
Solar radiation shield bracket: 10.8 x 8.3 cm (4.25 X 3.25 in.)
WeightLogger: 75.5 g (2.66 oz)
Solar radiation shield bracket: 20.4 g (0.72 oz)
MaterialsAcetal, silicone gasket, stainless steel screws
Environmental RatingNEMA 6 and IP67
CE CompliantThe CE Marking identifies this product as complying with all relevant directives in the European Union (EU).
FCC Logo Australia/New Zealand General Compliance mark  Japanese Telecom and Radio Certificaiton Mark South Korea KC Certification for Electrical and Electronic Products 

*Per RH sensor manufacturer data sheet

  • 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 HOBOconnect 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 indoor and outdoor environments.

    What measurements does this data logger support?

    The MX2304 data logger supports the following measurements: Soil Temperature and Temperature

In what environment does this data logger operate?

This data logger operates in an outdoor environment.

What measurements does this data logger support?

The MX2301A data logger supports the following measurements: Relative Humidity, Temperature and Dew Point