HOBO U23 Pro v2 Temperature/Relative Humidity Data Logger

Important Info

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 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

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%)
U23-001 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
Stability (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 minute in air moving 1 m/sec with protective cap
U23-002A:	15 seconds in air moving 1 m/sec
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); U23-001A,
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)
Dimensions:	Housing measures 10.2 — 3.8 cm (4.0 — 1.5 in.)
NIST certificate:	Temperature certificate available for additional charge
CE:	The CE Marking identifies this product as complying with all relevant directives in the European Union (EU)

Compatible Items

SOFTWARE
Graphing & Analysis

BHW-PRO-CD HOBOware Pro CD or USB Drive (USB Cable Included) Software
BHW-PRO-DLD HOBOware Pro – Mac/Win (Download Only) Software

COMMUNICATIONS
Data Offload – Base Stations – Shuttles – Couplers

BASE-U-4 Optic USB Base Station
U-DTW-1 HOBO Waterproof Shuttle

MAINTENANCE
Batteries

HP-B Replacement battery for U23 data loggers (sold individually)

Desiccants

DESICCANT1 Small Desiccant Pack (25-count) Replacement

Replacement Parts

CABLE-U23-002 Replacement sensor/cable for the U23-002 Replacement
HUM-RHPCB-2 Replacement RH Sensor Replacement

ACCESSORIES
Carrying Case

CASE-PELICAN-1510 Pelican Case

Compliance Certificates

COMPLIANCE CERT Compliance Certification

Data Offload – Base Stations – Shuttles – Couplers

COUPLER2-E Replacement Coupler for HOBO Pro v2 Replacement

NIST Setup & Certifications

NIST-RH Initial Purchase RH NIST Calibration Service Certification
NIST-SETUP Setup Charge for NIST Traceable Certification
NIST-TEMP-POINT NIST Temperature point Certification

Protective Covers and Boots

HUM-RHCAP2 Replacement RH caps – 5 pack Replacement

Solar Radiation Shields

M-RSA Solar Radiation Shield
RS1 Solar Radiation Shield

UV Protection Caps

U23-CAP 5 UV Protection Caps for U23 Series Data Loggers Replacement

Video

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