HOBO Water Level (30 ft, 0-4m) Logger U20L-04

U20L-04

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321,00 €

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Environment of Use Water
Type of Logger Portable
Measured Parameters Water level and temperature
With Display No
IP Classification IP68
Depth in meters 0 - 4m

The HOBO U20L-04 is a research-grade water level data logger for continuous measurement of water levels and temperatures in a wide range of underwater environments.
It features a 0.1% measurement accuracy, a polypropylene case housing for use in both fresh and salt water, and a non-vented design for convenient and trouble-free field use.

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 software is required when using the U-DTW-1 Waterproof Shuttle. See compatible items.

- 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 (0-4 m)
- Durable ceramic pressure sensor withstands freezing
- HOBOware Pro software provides easy conversion to accurate water level reading, fully compensated for barometric pressure, temperature, and water density

 

Environment:
The U20L-04 Data Logger is for use in Outdoor and Underwaterenvironments

Measurements:
The U20L-04 Data Logger supports the following measurements: Temperature, Barometric Pressure, Water Level

IMPORTANT: HOBO data loggers require HOBOware software (USB interface cable included w/CD purchase) and a communications device. See compatible Software/Accessories.

Pressure (Absolute) and Water Level Measurements U20L-04
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 Mode s 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.

* 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%.

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