The HOBO Water Level Data Logger (0-30 m) MX20L-02 is a low-cost, research-grade data logger with Bluetooth data offload to continuously monitor water level and temperature. Measures at depths of up to 100 ft in a wide range of underwater environments, both freshwater and saltwater.
The MX20L Water Level Logger brings you all the same great features as the U20L and more! Integrating Bluetooth for fast and reliable data download, the MX20L logger eliminates the need to plug your logger into a base station or shuttle to offload data in the field, ensuring continuous water level and temperature monitoring. With options to measure at depth ranges of 13, 30, or 100 feet in a wide range of underwater environments, this rugged logger features 0.1% measurement accuracy, a durable polypropylene housing for use in both freshwater and saltwater, and a non-vented design for convenient and reliable deployment.
The MX20L comes with a magnetic activation fob that can "wake up" the logger to activate its Bluetooth communication for configuration and data download. The included fob comes with a lanyard to prevent losing or dropping the fob in the field. This logger records absolute pressure, which is later converted to water level readings by the HOBOconnect software. To compensate for barometric pressure changes, you can use another HOBO MX20L Water Level logger as a barometric reference.
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
- Depth measurement options of up to 13, 30, or 100 feet depending on model
- Durable ceramic pressure sensor withstands freezing
- Streamlined data offload via Bluetooth to the free HOBOconnect app
- HOBOconnect app provides easy extraction and visulization of water level data
- Extended battery life up to 10 years (power-saving mode requires magnetic fob to activate Bluetooth for data download)
Note: A calibration certificate is not offered for this logger.
Specifications
Pressure (Absolute) and Water Level Measurements MX20L-02
| 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: ±0.1% FS, 3.0 cm (0.1 ft) Water Maximum error: ±0.2% FS, 6.0 cm (0.2 ft) Water |
| 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 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 | ±0.2°C from 0° to 50°C (±0.36°F from 32° to 122°F) |
| Resolution | 0.10°C at 25°C (0.18°F at 77°F) |
| Response Time (90%) | 10 minutes in water (typical) |
| Stability (Drift) | 0.1°C per year (0.18°F per year) |
Logger
| Wireless Standard | Bluetooth 5 LE |
| Transmission Range | Approximately 30.5 m (100 ft) line-of-sight |
| Radio Power | 1mW (0 dBm) |
| 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) | 3 years with 1-minute logging and Bluetooth always on 7 years with 1-minute logging and Bluetooth off and LED off 10 years with 5-minute logging and Bluetooth off and LED off |
| Battery Indication | Battery status shown in HOBOconnect app (approximate) |
| Memory (Non-volatile) | Approximately 400,000 sets of pressure and temperature measurements |
| Data Download Time (with Bluetooth 5+ devices) | Approximately 3.5 minutes; 100,000 measurements < 1 minute |
| 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 Modes | Fixed-interval (normal or statistics), burst or multiple intervals with up to 8 user-defined intervals and durations; logging intervals from 1 second to 18 hours. Refer to the HOBOconnect User’s Guide for details. |
| Start Modes | Immediate, next interval, date & time, button start (fob or app) |
| Stop Modes | Memory full, never stop (overwrite oldest data), date & time, or after set logging period |
| Pause | Pause and restart with HOBOconnect app |
| Alarms | Log high- or low-alarm events; alarm status shown in HOBOconnect app |
| Environmental Rating | |
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