Hobo U20L-02 – Onset

Water level data logger (to a depth of 30 meters), data offload via the BASE-U-4 optical USB station or the U-DTW-1 waterproof shuttle

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% 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.

The housing is made of a self-contained non-vented design, that enables easy deployment. It is ideal for use in both fresh and saltwater environments, including wells, streams, lakes, wetlands and tidal areas. With depths up to 30 meters.
The durable ceramic pressure sensor withstands freezing and the HOBOware Pro software provides easy conversion to accurate water level reading, fully compensated for barometric pressure, temperature and water density.
Note: A calibration certificate is not offered for this logger. If you require a NIST-traceable calibration certificate, please see the U20-001-02 (freshwater) or U20-001-02-Ti (saltwater).
This data logger operates in outdoor and water environments and the U20L-02 data logger supports the following measurements: absolute pressure, barometric pressure, temperature and water level.

Technical specifications

Pressure and water level operation range: 0 to 400 kPa: approximately 0 to 30,6 meters of water depth at sea level, or 0 to 33,6 meters of water at 3.000 meters of altitude

Factory calibrated range: 69 to 400 kPa, 0° to 40°C

Burst pressure: 500 kPa or 40,8 meters of depth

Water level accuracy: ±0,1% FS, 3,0 cm water

Temperature operation range: -20° to 50°C

Accuracy: ±0,44°C from 0° to 50°C

Stability (drift): 0,1°C per year

Battery: 2/3 AA, 3,6 Volt lithium, factory-replaceable

Battery life: 5 years with 1 minute or greater logging interval

Memory (non-volatile): 64K bytes memory (approximately 21.700 pressure and temperature samples)

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

CheckOptional with calibration

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