HOBO U20L Low-Cost Water Level Data Logger
- Recording Changing Water Level (Depth) and Temperature in Wet or Water Environments
- -20°C to 50°C Temperature Measurement Range with ±0.44°C Accuracy
- Factory-Replaceable 2/3 AA Lithium Battery with 5 Year Life (1 Minute Sampling Rate)
- Stores up to 21,700 Measured Readings with Date/Time Stamp
- 0 to 13 ft, 0 to 30 ft and 0 to 100 ft Water Level Ranges Available with ± 0.1% RF Accuracy
Requires HOBOware Pro Software (Version 3.2+) and an Optic USB Base Station (BASE-U-4) or Shuttle Data Transporter (U-DTW-1)
Overview of the HOBO U20L Series Water Level Data Logger
The Onset HOBO U20L Series Water Level loggers set a new standard when it comes to price and performance for water level and temperature recording. These loggers are available in 13-, 30-, and 100-foot depth ranges and all feature an accuracy level of 0.1%. These self-contained, non-vented loggers feature a rugged polypropylene housing making them ideal for both fresh and saltwater applications. All feature an accurate and durable ceramic pressure sensor and a mounting hole for easy installation. The loggers have a typical battery life of up to 5 years and the battery is factory replaceable. Downloading the logger can be done in less than 30 seconds using the required optical USB interface (BASE-U-4 or U-DTW-1). The logger is configured, and data is viewed using either free HOBOware or HOBOware Pro (paid) software.
Onset HOBO Water Level Data Logger Specifications
| Data Channels | 1 Temperature Channel 1 Pressure/Water Level Channel |
| Water Level | Measurement Range: 0 to 4m (0 to 13ft) - Sea Level; 0 to 7m (0 to 23ft) - 3,000m Altitude Burst Pressure: 18m (60ft) Depth Accuracy (Typical): ±0.1% FS, 0.4 cm (0.013 ft) Water Accuracy (Max): ±0.2% FS, 0.8 cm (0.026 ft) Water Resolution: 0.14 cm (0.005 ft) Water Response Time: < 1 second @ stable temperature to 90% NOTE: Measurement Accuracy Also Depends on Temperature Response Time |
| Pressure | Pressure Range: 0 to 145kPa (0 to 21 psia) Calibrated Range: 69 to 145 kPA (10 to 21 psia) @ 0°C to 40°C Burst Pressure: 310 kPa (45 psia) Raw Pressure Accuracy: ±0.3% FS, 0.43 kPa (0.17 psi) - Max Error Resolution: <0.014 kPa (0.002 psi) |
| Temperature | Measurement Range: -20°C to 50°C (-4°F to 122°F) Accuracy: ±0.44°C from 0°C to 50°C (±0.79°F from 32°F to 122°F) Resolution: 0.10°C at 25°C (0.18°F at 77°F) Response Time: 10 Minutes in Water to 90% (Typical) Stability (Drift): 0.1°C (0.18°F) per Year |
| Data Storage Capacity | 21,700 Pressure (Water Level) and Temperature Readings |
| Sampling Rate | 1 Second to 18 Hours (User-Specified) |
| Logging Modes | Fixed Rate or Multiple Logging Intervals ( up to 8) |
| Power Source | 2/3AA, 3.6 Volt Lithium Battery - Factory Replaceable |
| Battery Life | 5 Years @ 1 Minute Sampling Rate (Dependant Upon Environment and Operating Range) |
| Time Accuracy | ±1 Minute per Month @ 0 to 50°C (32°F to 122°F) |
| Communications | Optical Connection to Setup Data Logger and Download Data |
| Data Storage Modes | Stop When Full or Wrap/Overwrite When Full (FIFO) |
| Start Modes | Immediate Start or Delayed |
| Offload Modes | Offload While Logging; Stop and Offload |
| Materials | Polypropylene Housing and Lanyard; Vitron and Buna-N O-Rings; Ceramic Sensor in Acetyl End Cap; Stainless Steel Screws Suitable for Saltwater |
| Software Compatibility | HOBOware PRO Version 3.5+ |
| OS Compatibility | Windows: Windows 11, 10 and 7 (32 and 64-Bit) Mac: OS X 10.9.x, 10.10.x and 10.11.x |
| Weight | Air: 154 grams (5.43 oz) Fresh Water: 53.9 grams (1.9 oz) |
| Dimensions | 3.18 cm x 15.24 cm (1.25" x 6.0") Mounting Hole: 6.3mm (0.25") |
