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  • U23-002
  • U23-002
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HOBO U23 Pro v2 External Temperature/Relative Humidity Data Logger

Part # U23-002
 
This product is discontinued.
 

HOBO data loggers require HOBOware software and a USB cable. (Note: A USB cable is included w/HOBOware Pro CD or USB software purchase). HOBOware Pro is required when using the U-DTW-1 Waterproof shuttle. See compatible items below or build your kit above.

Overview

The HOBO Pro v2 External Temperature/Relative Humidity Data Logger is a weatherproof data logger with an external Temperature and Relative Humidity sensor on a 6-foot cable for fast sensor response and deployment in tight spaces. The Relative Humidity sensor features fast response and superior durability in humid environments, and is user-replaceable.

Optical Interface for data transfer

Pro v2 sensor mount in solar radiation shield

  • Weatherproof housing for use in outdoor or condensing environments
  • High accuracy
  • Replaceable Relative Humidity sensor provides fast response and superior recovery from condensing conditions
  • Small-diameter external sensor versions for measurements in tight spaces
  • Optic USB interface for fast and reliable download

In what environment does this operate?

This operates in an outdoor environment.

What measurements does this support?

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

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
Operation Range U23-001A internal sensor: -40 to 70°C (-40 to 158°F)
U23-002A external temperature sensor: -40 to 70°C (-40 to 158°F)
U23-003 and U23-004 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 U23-001A and U23-002A: ±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)
U23-003 and U23-004: ±0.21°C from 0° to 50°C (±0.38°F from 32° to 122°F); see Plot A
Resolution U23-001A and U23-002A: 0.04°C (0.072°F)
U23-003 and U23-004: 0.02°C at 25°C (0.04°F at 77°F); see Plot A
Response Time
(Typical to 90%)
U23-001A internal sensor: 10 minutes in air moving 1 m/sec
U23-002A external temperature sensor: 3 minutes, 45 seconds in air moving 1 m/sec
U23-003 and U23-004 external sensors: 3 minutes in air moving
1 m/sec; 30 seconds in stirred water
Drift U23-001A and U23-002A: <0.01°C (0.018°F) per year
U23-003 and U23-004: <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
(Typical to 90%)
U23-001A: 40 minutes in air moving 1 m/sec with protective cap
U23-002A: 15 seconds in air moving 1 m/sec
Drift <1% per year typical
Logger
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)
Materials All models: ASA styrene polymer housing and mounting clamp; polypropylene protective cap; Buna-N o-ring(s); U23-001A,
U23-002A only: ASA styrene polymer RH sensor cap; modified hydrophobic polyethersulfone membrane
Cables U23-001A: No cables
U23-002A: One 184 cm (6 ft) PVC cable; sensor diameter 1 cm (0.38 in.)
U23-003: Two 184 cm (6 ft) PVC cables; sensor diameter 0.5 cm (0.20 in.)
U23-004: One 184 cm (6 ft) PVC cable; sensor diameter 0.5 cm (0.20 in.)
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
CE Compliant The CE Marking identifies this product as complying with all relevant directives in the European Union (EU).

 

Performance graph

    • HOBO U23-002 Pro v2 External Temp/RH Data Logger
    • Clamp and mounting screws
    • UV protective cap

The following are associated resources for this product. In general users of this product can gain insight into its possible use by utilizing the resources below. Our user forum can also be a valuable resource for questions, use cases and general feedback. Share with us today, here!

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