Descripción
HOBO by Onset U20L-04 – Water Level (13 ft) Data Logger
Accurate, affordable water level monitoring
- Water Level (13 ft) Data Logger
- Self-contained non-vented design enables easy deployment
- Durable ceramic pressure sensor withstands freezing
- Ideal for use in both fresh and saltwater environments, including wells, streams, lakes, wetlands, and tidal areas
The HOBO U20L-04 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.
Note: A calibration certificate is not offered for this logger. If you require a NIST-traceable calibration certificate, please see the U20-001-04 (freshwater) or U20-001-04-Ti (saltwater).
Important Info: This logger requires HOBOware Pro software and either a U-DTW-1 Waterproof Shuttle or the Base-U-4 Optic USB Base Station for configuration and data offload.
| U20 Series – Water Level Data Loggers | |
| U20-001-04 | HOBO 13-Foot Depth Fresh Water Level Data Logger |
| U20-001-04-Ti | HOBO 13-Foot Depth Titanium Water Level Data Logger |
| U20-001-01 | HOBO 30-Foot Depth Fresh Water Level Data Logger |
| U20-001-01-Ti | HOBO 30-Foot Depth Titanium Water Level Data Logger |
| U20-001-02 | HOBO 100-Foot Depth Fresh Water Level Data Logger |
| U20-001-02-Ti | HOBO 100-Foot Depth Titanium Water Level Data Logger |
| U20-001-03 | HOBO 250-Foot Depth Fresh Water Level Data Logger |
| U20-001-03-Ti | HOBO 250-Foot Depth Titanium Water Level Data Logger |
| KIT-D-U20-04 | HOBO Water Level Data Logger Deluxe Kit (13ft) |
| KIT-D-U20-01 | HOBO Water Level Data Logger Deluxe Kit (30ft) |
| KIT-D-U20-02 | HOBO Water Level Data Logger Deluxe Kit (100ft) |
| KIT-S-U20-02 | HOBO Water Level Data Logger Starter Kit (100ft) |
| KIT-S-U20-04 | HOBO Water Level Data Logger Starter Kit (13ft) |
| KIT-S-U20-01 | HOBO Water Level Data Logger Starter Kit (30ft) |
| U20L-01 | HOBO Water Level (30ft) Data Logger |
| U20L-02 | HOBO Water Level (100ft) Data Logger |
| U20L-04 | HOBO Water Level (13 ft) Data Logger |
Manufacturer Specs
| Pressure (Absolute) and Water Level Measurements | |
| Operation Range | 0 to 145 kPa (0 to 21 psia); approximately 0 to 4 m (0 to 13 ft) of water depth at sea level, or 0 to 7 m (0 to 23 ft) of water at 3,000 m (10,000 ft) of altitude |
| Factory Calibrated Range | 69 to 145 kPa (10 to 21 psia), 0° to 40°C (32° to 104°F) |
| Burst Pressure | 310 kPa (45 psia) or 18 m (60 ft) depth |
| Water Level Accuracy* | Typical error: ±0.1% FS, 0.4 cm (0.013 ft) water Maximum error: ±0.2% FS, 0.8 cm (0.026 ft) water |
| Raw Pressure Accuracy** | ±0.3% FS, 0.43 kPa (0.063 psi) maximum error |
| Resolution | <0.014 kPa (0.002 psi), 0.14 cm (0.005 ft) water |
| Pressure Response Time (90%)*** | <1 second at a stable temperature; measurement accuracy also depends on temperature response time |
| Temperature Measurements | |
| 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 |
| Resolution | 0.10°C at 25°C (0.18°F at 77°F), see Plot A |
| Response Time (90%) | 10 minutes in water (typical) |
| Stability (Drift) | 0.1°C (0.18°F) per year |
| Logger | |
| 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 |
| CE Compliant | The CE Marking identifies this product as complying with all relevant directives in the European Union (EU) |
* Water Level Accuracy: With accurate reference water level measurement, known water density, accurate Barometric Compensation Assistant data, and a stable temperature environment.
** 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%.
Tech Specs
Test Equipment General Attributes |
|
|---|---|
| Unique Features | 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 13 feet |
| Safety Approval | CE |
| Product Weight | 154 GRAMS (0.340 LBS) |
| Product Length | 6 IN |
| Data Logging | Yes |
| HTS/Schedule B Number | 9031.80.8085 |
| ECCN Number | EAR99 |
| Battery Type | AA |
| Power Supply Voltage | Battery Powered |
| Country of Origin | United States |
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