U23-003
HOBO 2x External Temperature Data Logger
Discontinued
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.
Compatible with
Please note! Our U23 line of data loggers will soon be discontinued. We recommend upgrading to MX2300 loggers that offer the same reliability, enhanced performance, plus convenient Bluetooth wireless data offload:
Overview
A weatherproof data logger with two external soil/water temperature probes on 6-foot cables for fast sensor response and deployment in tight spaces.
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
Specifications
Temperature Sensor
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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
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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
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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
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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
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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)
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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%
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±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
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0.05%
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U23-001A: 40 minutes in air moving 1 m/sec with protective cap
U23-002A: 15 seconds in air moving 1 m/sec
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<1% per year typical
Logger
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-40° to 70°C-40° to 158°F
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±1 minute per month 0° to 50°C32° to 122°F
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1/2 AA, 3.6 Volt lithium, user-replaceable (HP-B)
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3 years with 1 minute or greater logging interval
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64K bytes memory (approx. 21,000 temperature and RH measurements)
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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
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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.)
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Electronics housing is NEMA 6P equivalent (tolerant of brief submergence);
Units with RH sensors are NEMA 4 equivalent (splash-resistant)
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Immediate start; delayed start
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Fixed-rate or multiple logging intervals, with up to 8 user-defined logging intervals and durations; logging intervals from 1 second to 18 hours
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Offload while logging; stop and offload
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Battery voltage can be viewed in status screen and optionally logged in datafile. Low battery indication in datafile.
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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)
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Housing measures 10.2 × 3.8 cm4.0 Ã 1.5 in.
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Temperature certificate available for additional charge
Compatible items
Compliance Certificates
Data Offload - Base Stations - Shuttles - Couplers
NIST Setup & Certifications
Solar Radiation Shields
UV Protection Caps
Accessories
Batteries
Desiccants
Communications
Data Offload - Base Stations - Shuttles - Couplers
Graphing & Analysis
What's in the box
- HOBO U23-003 2x External Temp Data Logger
- Clamp and mounting screws
- UV protective cap
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