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The HOBO U20L-02 is a low-cost, research-grade water level data logger for continuously measuring water level and temperature in a wide range of underwater environments. It features 0.1% measurement accuracy, a polypropylene housing for use in both fresh and salt water, and a non-vented design for convenient and hassle-free deployment.
This data logger requires either the U-DTW-1 Waterproof Shuttle or the Base-U-4 Base Station for configuration and data offload, HOBOware software (free download). NOTE: HOBOware Pro is required when using the U-DTW-1 Waterproof Shuttle. See compatible items below.
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• Self-contained non-vented design enables easy deployment
• Ideal for use in both fresh and saltwater environments, including wells, streams, lakes, wetlands, and tidal areas
• Depths up to 100 feet
• Durable ceramic pressure sensor withstands freezing
• HOBOware Pro software provides easy conversion to accurate water level reading, fully compensated for barometric pressure (see demo), temperature, and water density.
Operation Range | 0 to 400 kPa (0 to 58 psia); approximately 0 to 30.6 m (0 to 100 ft) of water depth at sea level, or 0 to 33.6 m (0 to 111 ft) of water at 3,000 m (10,000 ft) of altitude
Factory Calibrated Range | 69 to 400 kPa (10 to 58 psia), 0° to 40°C (32° to 104°F)
Burst Pressure | 500 kPa (72.5 psia) or 40.8 m (134 ft) depth
Water Level Accuracy* | Typical error: ±0.1% FS, 3.0 cm (0.1 ft) water
Maximum error: ±0.2% FS, 6.0 cm (0.2 ft) water
Raw Pressure Accuracy** | ±0.3% FS, 1.20 kPa (0.17 psi) maximum error
Resolution | <0.04 kPa (0.006 psi), 0.41 cm (0.013 ft) water
Pressure Response Time (90%)*** | <1 second at a stable temperature; measurement accuracy also depends on temperature response time
Operation Range | -20° to 50°C (-4° to 122°F)
Accuracy | ±0.44°C from 0° to 50°C (±0.79°F from 32° to 122°F), see Plot A in manual
Resolution | 0.10°C at 25°C (0.18°F at 77°F), see Plot A in manual
Response Time (90%) | 10 minutes in water (typical)
Stability (Drift) | 0.1°C (0.18°F) per year
Real-time Clock | ±1 minute per month 0° to 50°C (32° to 122°F)
Battery | 2/3 AA, 3.6 Volt lithium, factory-replaceable
Battery Life (Typical Use) | 5 years with 1 minute or greater logging interval
Memory (Non-volatile) | 64K bytes memory (approx. 21,700 pressure and temperature samples)
Weight | Approximately 154 g (5.43 oz) in air Approximately 53.9 g (1.9 oz) in fresh water
Dimensions | 3.18 cm (1.25 inches) diameter, 15.24 cm (6.0 inches) length; mounting hole 6.3 mm (0.25 inches) diameter
Wetted Materials | Polypropylene housing and lanyard; Viton and Buna-N O-rings; ceramic sensor in acetyl end cap; stainless steel screws suitable for saltwater
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 the HOBOware User’s Guide for details.
Launch Modes | Immediate start and delayed start
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.
Environmental Rating: | IP68
CE Compliant | The CE Marking identifies this product as complying with all relevant directives in the European Union (EU).
** Raw Pressure Accuracy: Absolute pressure sensor accuracy includes all sensor drift, temperature, and hysteresis-induced errors.
*** Changes in Temperature: Allow 20 minutes in water to achieve full temperature compensation of the pressure sensor. Maximum error due to rapid thermal changes is approximately 0.5%
| Property | Value |
|---|---|
| **Operation Range** | 0 to 400 kPa (0 to 58 psia); approximately 0 to 30.6 m (0 to 100 ft) of water depth at sea level, or 0 to 33.6 m (0 to 111 ft) of water at 3,000 m (10,000 ft) of altitude |
| **Factory Calibrated Range** | 69 to 400 kPa (10 to 58 psia), 0° to 40°C (32° to 104°F) |
| **Burst Pressure** | 500 kPa (72.5 psia) or 40.8 m (134 ft) depth |
| **Water Level Accuracy*** | Typical error: ±0.1% FS, 3.0 cm (0.1 ft) water |
| **Raw Pressure Accuracy**** | ±0.3% FS, 1.20 kPa (0.17 psi) maximum error |
| **Resolution** | <0.04 kPa (0.006 psi), 0.41 cm (0.013 ft) water |
| **Pressure Response Time (90%)***** | <1 second at a stable temperature; measurement accuracy also depends on temperature response time |
| **Accuracy** | ±0.44°C from 0° to 50°C (±0.79°F from 32° to 122°F), see Plot A in manual |
| **Response Time (90%)** | 10 minutes in water (typical) |
| **Stability (Drift)** | 0.1°C (0.18°F) per year |
| **Real-time Clock** | ±1 minute per month 0° to 50°C (32° to 122°F) |
| **Battery** | 2/3 AA, 3.6 Volt lithium, factory-replaceable |
| **Battery Life (Typical Use)** | 5 years with 1 minute or greater logging interval |
| **Memory (Non-volatile)** | 64K bytes memory (approx. 21,700 pressure and temperature samples) |
| **Weight** | Approximately 154 g (5.43 oz) in air Approximately 53.9 g (1.9 oz) in fresh water |
| **Dimensions** | 3.18 cm (1.25 inches) diameter, 15.24 cm (6.0 inches) length; mounting hole 6.3 mm (0.25 inches) diameter |
| **Wetted Materials** | Polypropylene housing and lanyard; Viton and Buna-N O-rings; ceramic sensor in acetyl end cap; stainless steel screws suitable for saltwater |
| **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 the HOBOware User’s Guide for details. |
| **Launch Modes** | Immediate start and delayed start |
| **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. |
| **Environmental Rating:** | IP68 |
| **CE Compliant** | The CE Marking identifies this product as complying with all relevant directives in the European Union (EU). |
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