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HOBO U20L-04 Water Level Data Logger

HOBO U20L-04 Water Level Data Logger

  • A low-cost, research-grade data logger for continuous monitoring of water level and temperature at depths of up to 13, 30, or 100 feet in a wide range of underwater environments. This logger features 0.1% measurement accuracy, a polypropylene housing for use in both freshwater and saltwater, and a non-vented design for convenient and hassle-free deployment.

Features
  • Self-contained, non-vented design enables easy deployment
  • Ideal for use in both freshwater and saltwater environments, including wells, streams, lakes, wetlands, and tidal areas
  • Depths up to 13, 30, or 100 feet depending on model
  • 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

Spesifikasi

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 (All Models)

Operation Range
-20° to 50°C
-4° to 122°F
Accuracy
±0.44°C from 0° to 50°C , see manual for plot
±0.79°F from 32° to 122°F , see manual for plot
Resolution
0.10°C at 25°C , see manual for plot
0.18°F at 77°F , see manual for plot
Response Time (90%)

10 minutes in water (typical)

Stability (Drift)
0.1°C per year
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 acetal 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.

Environmental Rating

IP68

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