HOBO MX20L Self-contained Bluetooth (BLE) Water Level & Temperature Data Logger
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A low-cost, research-grade data logger with Bluetooth data offload to continuously monitor water level and temperature. Measures at depths of up to 13, 30, or 100 feet in a wide range of underwater environments, both freshwater and saltwater.
Communications
Access your data directly from your mobile phone, tablet or Windows computer when within 100 foot (30 m) line-of-sight range of the logger, with the free HOBOconnect app.
To enable cloud data storage and analysis, add an MX Data Plan (select from the options above).
To enable near real-time remote monitoring and alerts via email or text message, add an MX Data Plan and an MX Gateway (select from the options above). Note: the MX Gateway must be indoors.
You can download the HOBOconnect app here:
| HOBO Product Series | MX2000 |
|---|---|
| Measurements | Barometric Pressure, Water Level, Water Temperature |
| Data Available By | Wireless (Bluetooth/RF), Mobile App |
Pressure (Absolute) and Water Level Measurements MX20L-01
Operation Range
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0 to 207 kPa (0 to 30 psia); approximately 0 to 9 m (0 to 30 ft) of water depth at sea level, or 0 to 12 m (0 to 40 ft) of water at 3,000 m (10,000 ft) of altitude
Factory Calibrated Range
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69 to 207 kPa, 0° to 40°C10 to 30 psia, 32° to 104°F
Burst Pressure
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310 kPa or 18 m depth45 psia or 60 ft depth
Water Level Accuracy*
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Typical error: ±0.1% FS, 1.0 cm (0.03 ft) WaterMaximum error: ±0.2% FS, 2.0 cm (0.06 ft) Water
Raw Pressure Accuracy**
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±0.3% FS, 0.62 kPa (0.09 psi) Maximum error
Resolution
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<0.02 kPa Water0.007 ft Water
Pressure Response Time (90%)***
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<1 second at a stable temperature; measurement accuracy also depends on temperature response time
-
Pressure (Absolute) and Water Level Measurements MX20L-02
Operation Range
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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
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69 to 400 kPa (10 to 58 psia), 0° to 40°C (32° to 104°F)
Burst Pressure
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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) WaterMaximum error: ±0.2% FS, 6.0 cm (0.2 ft) Water
Raw Pressure Accuracy**
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±0.3% FS, 1.20 kPa (0.17 psi) Maximum error
Resolution
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<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
Pressure (Absolute) and Water Level Measurements MX20L-04
Operation Range
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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
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310 kPa (45 psia) or 18 m (60 ft) Depth
Water Level Accuracy*
-
Typical error: ±0.1% FS, 0.4 cm (0.013 ft) WaterMaximum 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
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-20° to 50°C-4° to 122°F
Accuracy
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±0.2°C from 0° to 50°C±0.36°F from 32° to 122°F
Resolution
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0.10°C at 25°C0.18°F at 77°F
Response Time (90%)
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10 minutes in water (typical)
Stability (Drift)
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0.1°C per year0.18°F per year
Logger
Wireless Standard
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Bluetooth 5 LE
Transmission Range
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Approximately 30.5 m (100 ft) line-of-sight
Radio Power
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1mW (0 dBm)
Real-time Clock
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±1 minute per month 0° to 50°C (32° to 122°F)
Battery
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2/3 AA, 3.6 Volt lithium, factory-replaceable
Battery Life (Typical Use)
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3 years with 1-minute logging and Bluetooth always on7 years with 1-minute logging and Bluetooth off and LED off10 years with 5-minute logging and Bluetooth off and LED off
Battery Indication
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Battery status shown in HOBOconnect app (approximate)
Memory (Non-volatile)
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Approximately 400,000 sets of pressure and temperature measurements
Data Download Time (with Bluetooth 5+ devices)
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Full Memory: Approximately 3.5 minutes1000,000 measurements < 1 minute
Weight
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Approximately 154 g (5.43 oz) in airApproximately 53.9 g (1.9 oz) in fresh water
Dimensions
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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
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Polypropylene housing and lanyard; Viton and Buna-N O-rings; ceramic sensor in acetal end cap; stainless steel screws suitable for saltwater
Logging Modes
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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
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Immediate, next interval, date & time, button start (fob or app)
Stop Modes
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Memory full, never stop (overwrite oldest data), date & time, or after set logging period
Pause
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Pause and restart with HOBOconnect app
Alarms
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Log high- or low-alarm events; alarm status shown in HOBOconnect app
Environmental Rating
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IP68
* Water Level Accuracy: With accurate reference water level measurement, known water density, accurate barometric compensation 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%.
FAQs
How can I get a compensated barometric pressure reading?
The MX20L logger records absolute pressure, which is later converted to water level readings by HOBOconnect software. To compensate for barometric pressure changes, you can use another HOBO MX20L Water Level logger as a barometric reference. The barometric reference device is typically deployed in the same well or at the same location as the water level of interest, but rather than being placed in the water column, it is deployed above the water in air.
Since barometric pressure readings are consistent across a region (except during fast-moving weather events), you can generally use barometric pressure readings that are taken within 15 km (10 miles) of the logger or more without significantly degrading the accuracy of the compensation. This means you only need to use one MX20L logger as a barometric reference for any loggers within this range.
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The MX20L Water Level Logger brings you all the great features of 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. Additional activation fobs are available for purchase.
This logger records absolute pressure, which is later converted to water level readings by HOBOconnect software. To compensate for barometric pressure changes, you can use another HOBO MX20L Water Level logger as a barometric reference.
Key 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 visualisation of water level data
- Extended battery life up to 10 years (power-saving mode requires magnetic fob to activate Bluetooth for data download).
Requires a compatible mobile device or Windows computer and the HOBOconnect app (available from iTunes or Google Play).
Note: A calibration certificate is not offered for this logger. If you require an NIST-traceable calibration certificate, please see the U20-001-01 (freshwater) or U20-001-01-Ti (saltwater).