HOBO U23 Pro v2 Temperature/Relative Humidity Data Logger

OverviewThe HOBO Pro v2 Temperature/Relative Humidity data logger is a weatherproof data logger with built-in temperature and relative humidity sensors. The Relative Humidity sensor provides superior

  • Product Name:HOBO U23 Pro v2 Temperature/Relative Humidity Data Logger
  • Item No.:U23-001
  • Manufacturers:Onset
  • Country of Origin:US

Overview

The HOBO Pro v2 Temperature/Relative Humidity data logger is a weatherproof data logger with built-in temperature and relative humidity sensors. The Relative Humidity sensor provides superior durability in humid environments and is user-replaceable.

Highlighted Features

  • 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

  • Compatible with HOBOware and HOBOware Pro software for logger setup, graphing and analysis (HOBOware Pro is required when using the U-DTW-1 Waterproof shuttle)

In what environment does this data logger operate?

This data logger operates in an outdoor environment.

What measurements does this data logger support?

The U23-001 data logger supports the following measurements: Relative Humidity and Temperature


Temperature Sensor
Operation range internal sensors:     -40° to 70°C (-40° to 158°F)
U23-002 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:     ±0.21°C from 0° to 50°C (±0.38°F from 32° to 122°F)
Resolution:     0.02°C at 25°C (0.04°F at 77°F); see Plot A in the manual

Response Time (typical to 90%)

U23-001 internal sensor:     40 minutes in air moving 1 m/sec
U23-002 external temperature sensor:     5 minutes 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

Stability (drift):     < 0.1°C (0.18°F) per year


Relative Humidity Sensor (U23-001, U23-002 only)

Operation range:     0-100% 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%)
U23-001:     40 minute in air moving 1 m/sec with protective cap
U23-002:     5 minutes in air moving 1 m/sec with protective cap
Stability (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 (part # 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)
U23-001, U23-002 only:     ASA styrene polymer RH sensor cap; modified hydrophobic polyethersulfone membrane

Cables
U23-001:     No cables
U23-002:     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 (refer to HOBOware software manual)
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
U23-001:     57 g (1.5 oz)
U23-002:     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