Deskripsi
Highlighted Features
- Lightning protection – no long signal wires, and electronics are shielded in stainless steel housing for use in freshwater (see the Water Level logger sensor location drawing)
- HOBOware Pro software provides easy conversion to accurate water level reading, fully compensated for barometric pressure (see demo) temperature, and water density.
- Multiple-rate sampling (see demo) allows faster sampling at critical times such as when pumping starts or stops.
- Available in 4 depth ranges
- Ideal for use in wells, streams, lakes, wetlands and tidal areas
- No-vent-tube design for easy reliable deployment
- Available in stainless and titanium versions
- Durable ceramic pressure sensor
- 3-point NIST-traceable calibration certificate included
In what environment does this data logger operate?
This data logger operates in outdoor and underwater environments.
What measurements does this data logger support?
The U20-001-02 data logger supports the following measurements: Absolute Pressure, Barometric Pressure, Temperature and Water Level.
Specification
| Pressure and Water Level Measurements U20-001-02 and U20-001-02-Ti | ||
| Operation Range | 0 to 400 kPa (0 to 58 psia); approximately 0 to 30.6 m (0 to 100 ft) of water depth at sea level, or 0 to 33.6 m (0 to 111 ft) of water at 3,000 m (10,000 ft) of altitude | |
| Factory Calibrated Range | 69 to 400 kPa (10 to 58 psia), 0° to 40°C (32° to 104°F) | |
| Burst Pressure | 500 kPa (72.5 psia) or 40.8 m (134 ft) depth | |
| Water Level Accuracy* | Typical error: ±0.05% FS, 1.5 cm (0.05 ft) water Maximum error: ±0.1% FS, 3 cm (0.1 ft) water |
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| Raw Pressure Accuracy** | ±0.3% FS, 1.20 kPa (0.17 psi) maximum error | |
| Resolution | <0.04 kPa (0.006 psi), 0.41 cm (0.013 ft) water | |
| Pressure Response Time (90%)*** | <1 second; 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 (±0.79°F from 32° to 122°F), see Plot A in manual | |
| Resolution | 0.10°C at 25°C (0.18°F at 77°F), see Plot A in manual | |
| Response Time (90%) | 5 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 | Stainless steel models: approximately 210 g (7.4 oz) Titanium models: approximately 140 g (4.8 oz) |
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| Dimensions | 2.46 cm (0.97 inches) diameter, 15 cm (5.9 inches) length; mounting hole 6.3 mm (0.25 inches) diameter | |
| Wetted Materials | 316 stainless steel, Viton® o-rings, acetyl cap, ceramic sensor | |
| 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 software manual. | |
| 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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The CE Marking identifies this product as complying with all relevant directives in the European Union (EU). | |
* 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 10 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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