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Providing a narrow range of measurement for the best possible accuracy, this version is ideal for monitoring water levels and temperatures in wells, streams, lakes and wetlands.
Like other HOBO Water Level Data Loggers, the 4m version offers exceptional value and ease-of-use, with no cumbersome vent tubes or desiccants to maintain. This data logger is ideal for recording water levels and temperatures in salt water environments.
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Lightning protection - no long signal wires, and electronics are shielded in a titanium housing for use in saltwater
HOBOware Pro software provides easy conversion to accurate water level reading, fully compensated for barometric pressure temperature, and water density.
Multiple-rate sampling 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
The U20-001-04-Ti data logger supports the following measurements: Absolute Pressure, Barometric Pressure, Temperature and Water Level
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: ±0.075% FS, 0.3 cm (0.01 ft) water
Maximum error: ±0.15% FS, 0.6 cm (0.02 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; 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)
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 | Titanium, 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 |
| The CE Marking identifies this product as complying with all relevant directives in the European Union (EU).
** 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%.
| Property | Value |
|---|---|
| **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: ±0.075% FS, 0.3 cm (0.01 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; measurement accuracy also depends on temperature response time |
| **Accuracy** | ±0.44°C from 0° to 50°C (±0.79°F from 32° to 122°F), see Plot A in manual |
| **Response Time (90%)** | 5 minutes in water (typical) |
| **Stability (Drift)** | 0.1°C (0.18°F) per year |
| **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) |
| **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** | Titanium, 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 |
|  | The CE Marking identifies this product as complying with all relevant directives in the European Union (EU). |
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