HOBO MX2302A External Temperature/RH Sensor Data Logger

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Overview

The HOBO MX2302 is a weatherproof data logger with external temperature and relative humidity sensors. 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 MX2302 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.

Manufactured by: Onset
Model: HOBO MX2302A External Temperature/RH Sensor Data Logger

Services offered for this product

  • Sales
  • Rental
  • Installation
  • Calibration
  • Maintenance

Applications

Dew point
Relative humidity
Temperature

Specification

Temperature Sensor
Range MX2301A 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
Resolution MX2301A 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)
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 0.01%
Drift <1% per year typical
Response Time (typical, to 90% of change)
Temperature Without Solar Radiation Shield With RS1/M-RSA Solar Radiation Shield With RS3-B Solar Radiation Shield
MX2301A
internal sensor
17 minutes in air moving 1 m/sec 24 minutes in air moving 1 m/sec NA
MX2302A
external sensor
3 minutes, 45 seconds in air moving 1 m/sec 7 minutes, 45 seconds in air moving 1 m/sec 6 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 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 NA
RH Without Solar Radiation Shield With RS1/M-RSA Solar Radiation Shield With RS3-B Solar Radiation Shield
MX2301A
internal sensor
30 seconds in air moving 1 m/sec 40 seconds in air moving 1 m/sec NA
MX2302A
external sensor
15 seconds in air moving 1 m/sec 30 seconds in air moving 1 m/sec 30 seconds in air moving 1 m/sec
Logger
Operating Range -40° to 70°C (-40° 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
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 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.
Memory MX2301A and MX2302A: 128 KB (63,488 measurements, maximum)
MX2303, MX2304, and MX2305: 128 KB (84,650 measurements, maximum)
Full Memory Download Time Approximately 60 seconds; may take longer the further the device is from the logger
Dimensions Logger 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.)
Weight Logger: 75.5 g (2.66 oz)
Solar radiation shield bracket: 20.4 g (0.72 oz)
Materials Acetal, silicone gasket, stainless steel screws
Environmental Rating NEMA 6 and IP67

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