Pro v2 External Temp Data Logger - eucatech Store
Pro v2 External Temp Data Logger - eucatech Store


Pro v2 External Temp Data Logger

Sale priceR 5,160.96
SKU: U23-004



A weatherproof data logger with an external soil/water temperature sensor on a 6-foot cable, for applications where just one temperature probe is required. Also includes an internal temperature sensor.

Diagram of data retrieval from U23 data logger using optic base station.


Data Sheet
User Manual


Highlighted Features

  • Weatherproof housing for use in outdoor or condensing environments
  • High accuracy
  • Small-diameter external sensor versions for measurements in tight spaces
  • Optic USB interface for fast and reliable download
  • Compatible with HOBOware and HOBOware Pro software for logger setup, graphing, and analysis


    Measurement U23-001A Internal Sensor U23-002A External Sensor U23-003 and U23-004 External Sensors
    Operation Range -40 to 70°C (-40 to 158°F) -40 to 70°C (-40 to 158°F) -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 ±0.25°C from -40 to 0°C ±0.21°C from 0° to 50°C (±0.38°F from 32° to 122°F); see Plot A
    ±0.2°C from 0 to 70°C ±0.2°C from 0 to 70°C
    Resolution 0.04°C (0.072°F) 0.04°C (0.072°F) 0.02°C at 25°C (0.04°F at 77°F); see Plot A
    Response Time 10 minutes in air moving 1 m/sec 3 minutes, 45 seconds in air moving 1 m/sec 3 minutes in air moving 1 m/sec; 30 seconds in stirred water
    Drift <0.01°C (0.018°F) per year <0.01°C (0.018°F) per year <0.1°C (0.18°F) per year
    Relative Humidity Sensor U23-001A, U23-002A only
    Operation 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% RH typical to a maximum of ±3.5% including hysteresis at 25°C (77°F); below 10% and above 90% ±5% typical
    Resolution 0.05%
    Response Time 40 minutes in air moving 1 m/sec with protective cap
    15 seconds in air moving 1 m/sec
    Drift <1% per year typical
    Operation Range -40° to 70°C (-40° to 158°F)
    Real-time Clock ±1 minute per month 0° to 50°C (32° to 122°F)
    Battery 1/2 AA, 3.6 Volt lithium, user-replaceable (HP-B)
    Battery Life (Typical Use) 3 years with 1 minute or greater logging interval
    Memory (Non-Volatile) 64K bytes memory (approx. 21,000 temperature and RH measurements)
    Environmental Rating Electronics housing is NEMA 6P equivalent (tolerant of brief submergence); Units with RH sensors are NEMA 4 equivalent (splash-resistant)
    Launch Modes Immediate start; delayed start
    Logging Interval Fixed-rate or multiple logging intervals, with up to 8 user-defined logging intervals and durations; logging intervals from 1 second to 18 hours
    Offload Modes Offload while logging; stop and offload
    Battery Indication Battery voltage can be viewed in status screen and optionally logged in datafile. Low battery indication in datafile.
    Weight U23-001A: 57 g (1.5 oz); U23-002A: 118 g (3.1 oz); U23-003: 138 g (3.7 oz); U23-004: 102 g (2.7 oz)
    Dimensions Housing measures 10.2 × 3.8 cm (4.0 × 1.5 in.)
    NIST Certificate Temperature certificate available for additional charge


    In what environment does this data logger operate?

    This data logger operates in an outdoor environment.

    What measurements does this data logger support?

    The U23-004 data logger supports the following measurement: Temperature