Skip to the beginning of the images gallery

HOBO U23 Pro v2 External Temperature Data Logger

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.

Important Information

Requires HOBOware software and either an Optic USB Base Station or HOBO Waterproof Shuttle (U-DTW-1). HOBOware Pro is required when using the HOBO Waterproof Shuttle. See compatible items below.

CHF 244.00

SKU

U23-004

Buy 10 for CHF 236.70 each and save 3%
Buy 25 for CHF 231.80 each and save 5%
Buy 50 for CHF 224.50 each and save 8%
Buy 100 for CHF 214.75 each and save 12%

Details

Technische Daten

Datenblatt

Kompatible Artikel

Overview

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.

Diagram showing installation of U23 data logger and solar radiation shield.

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

What's in the box

HOBO U23-004 Pro v2 External Temp Data Logger
Clamp and mounting screws
UV protective cap

Specifications

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 Ã 1.5 in.
NIST Certificate: Temperature certificate available for additional charge