MX20L-04
•MX20L-01
•MX20L-02
HOBO MX Water Level Data Logger
Bluetooth data offload
*LIMITED TIME INTRODUCTORY PRICE
*Introductory pricing ends December 31, 2024
Important Information
Requires a compatible mobile device or Windows computer and the HOBOconnect app. System requirements can be found at the bottom of the HOBOconnect software page.
Compatible with
Learn More! Join our MX20L Introductory Webinar:
Overview
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. You can purchase additional activation fobs HERE.
This logger records absolute pressure, which is later converted to water level readings by our HOBOconnect software. To compensate for barometric pressure changes, you can use another HOBO MX20L Water Level logger as a barometric reference. See our FAQ section for more information.
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. If you require a NIST-traceable calibration certificate, please see the U20-001-01 (freshwater) or U20-001-01-Ti (saltwater).
Specifications
Pressure (Absolute) and Water Level Measurements MX20L-01
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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
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69 to 207 kPa, 0° to 40°C10 to 30 psia, 32° to 104°F
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310 kPa or 18 m depth45 psia or 60 ft depth
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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
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±0.3% FS, 0.62 kPa (0.09 psi) Maximum error
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<0.02 kPa Water0.007 ft Water
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<1 second at a stable temperature; measurement accuracy also depends on temperature response time
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Pressure (Absolute) and Water Level Measurements MX20L-02
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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
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69 to 400 kPa (10 to 58 psia), 0° to 40°C (32° to 104°F)
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500 kPa (72.5 psia) or 40.8 m (134 ft) Depth
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Typical error: ±0.1% FS, 3.0 cm (0.1 ft) WaterMaximum error: ±0.2% FS, 6.0 cm (0.2 ft) Water
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±0.3% FS, 1.20 kPa (0.17 psi) Maximum error
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<0.04 kPa (0.006 psi), 0.41 cm (0.013 ft) Water
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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-04
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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
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69 to 145 kPa (10 to 21 psia), 0° to 40°C (32° to 104°F)
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310 kPa (45 psia) or 18 m (60 ft) Depth
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Typical error: ±0.1% FS, 0.4 cm (0.013 ft) WaterMaximum error: ±0.2% FS, 0.8 cm (0.026 ft) Water
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±0.3% FS, 0.43 kPa (0.063 psi) Maximum error
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<0.014 kPa (0.002 psi), 0.14 cm (0.005 ft) Water
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<1 second at a stable temperature; measurement accuracy also depends on temperature response time
Temperature Measurements (All Models)
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-20° to 50°C-4° to 122°F
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±0.2°C from 0° to 50°C±0.36°F from 32° to 122°F
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0.10°C at 25°C0.18°F at 77°F
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10 minutes in water (typical)
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0.1°C per year0.18°F per year
Logger
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Bluetooth 5 LE
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Approximately 30.5 m (100 ft) line-of-sight
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1mW (0 dBm)
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±1 minute per month 0° to 50°C (32° to 122°F)
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2/3 AA, 3.6 Volt lithium, factory-replaceable
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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
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Battery status shown in HOBOconnect app (approximate)
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Approximately 400,000 sets of pressure and temperature measurements
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Full Memory: Approximately 3.5 minutes1000,000 measurements < 1 minute
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Approximately 154 g (5.43 oz) in airApproximately 53.9 g (1.9 oz) in fresh water
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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
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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
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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.
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Immediate, next interval, date & time, button start (fob or app)
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Memory full, never stop (overwrite oldest data), date & time, or after set logging period
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Pause and restart with HOBOconnect app
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Log high- or low-alarm events; alarm status shown in HOBOconnect app
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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%.
Compatible items
Communications
Stainless Steel Cable/Crimps
Well Caps
Compliance Certificates
FAQs
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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