Optional with calibration
Jeroen Smits
Manager Product- en Sector Specialists
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