HOBO MX20 Research-Grade Water Level & Temperature Data Logger with Bluetooth Wireless Offload
Research-grade accuracy for continuous monitoring of absolute pressure, water level, and temperature in durable steel (freshwater) and titanium (saltwater) options. Easy wireless offload.
Choose from four depth ratings: 4m (13ft), 9m (30ft), 30m (100ft, 76m (250ft).
Includes NIST-traceable certificate.
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 MX20-01 | MX20-01-Ti
Operation Range
-
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
-
69 to 207 kPa (10 to 30 psia), 0° to 40°C (32° to 104°F)
Burst Pressure
-
310 kPa (45 psia) or 18 m (60 ft) depth
Water Level Accuracy*
-
9m (30') Typical error: ±0.05% FS, 1.0 cm (0.03 ft) water Maximum error: ±0.1% FS, 3 cm (0.1 ft) water
Raw Pressure Accuracy**
-
±0.3% FS, 0.62 kPa (0.09 psi) maximum error
Resolution
-
<0.02 kPa (0.003 psi), 0.21 cm (0.007 ft) water
Pressure Response Time (90%)***
-
<1 second; measurement accuracy also depends on temperature response time
Pressure (Absolute) and Water Level Measurements MX20-02 | MX20-02-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) waterMaximum error: ±0.1% FS, 3 cm (0.1 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; measurement accuracy also depends on temperature response time
Pressure (Absolute) and Water Level Measurements MX20-03 | MX20-03-Ti
Operation Range
-
0 to 850 kPa (0 to 123.3 psia); approximately 0 to 76.5 m (0 to 251 ft) of water depth at sea level, or 0 to 79.5 m (0 to 262 ft) of water at 3,000 m (10,000 ft) of altitude
Factory Calibrated Range
-
69 to 207 kPa (10 to 30 psia), 0° to 40°C (32° to 104°F)
Burst Pressure
-
1200 kPa (174 psia) or 112 m (368 ft) depth
Water Level Accuracy*
-
Typical error: ±0.05% FS, 3.8 cm (0.125 ft) waterMaximum error: ±0.1% FS, 7.6 cm (0.25 ft) water
Raw Pressure Accuracy**
-
±0.3% FS, 2.55 kPa (0.37 psi) maximum error
Resolution
-
<0.085 kPa (0.012 psi), 0.87 cm (0.028 ft) water
Pressure Response Time (90%)***
-
<1 second; measurement accuracy also depends on temperature response time
Pressure (Absolute) and Water Level Measurements MX20-04 | MX20-04-Ti
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*
-
4m (13') 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
-
±0.2°C from 0° to 50°C (±0.36°F from 32° to 122°F)
Resolution
-
0.002°C at 25°C (0.004°F at 77°F)
Response Time (90%)
-
5 minutes in water (typical)
Stability (Drift)
-
0.1°C (0.18°F) per year
Logger
Wireless Standard
-
Bluetooth 5 LE
Transmission Range
-
Approximately 3-10 ft line-of-sight
Radio Power
-
1mW (0 dBm)
Real-time Clock
-
± 1 minute per month 0° to 50°C32° to 122°F
Battery
-
2/3 AA, 3.6 Volt lithium, factory-replaceable
Battery Life (Typical Use)
-
3 years with 1-minute logging, Bluetooth always on7 years with 1-minute logging, Bluetooth and LED off10 years with 5-minute logging, Bluetooth and LED off
Memory
-
Approximately 400,000 sets of pressure and temperature measurements
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
-
316 stainless steel, Viton® o-rings, acetyl cap, ceramic sensorTitanium models: Titanium, Viton O-rings, acetal cap, ceramic sensor
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.
Launch Modes
-
Immediate start and delayed start
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
Battery Indication
-
Battery status shown in HOBOconnect app (approximate)
Environmental Rating
-
IP68
NOTES
* 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 10 minutes in water to achieve full temperature compensation of the pressure sensor. Maximum error due to rapid thermal changes is approximately 0.5%.
HOBO MX20 series data logger
Magnetic activation fob
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Delivering the highest accuracy in a rugged design, the wireless MX20 data logger provides research-grade measurements for professional water level monitoring applications in both freshwater and saltwater environments, and features convenient Bluetooth for seamless set-up, configuration, and data offloading.
An integrated absolute pressure sensor eliminates the need for cumbersome vent tubes or desiccants to maintain, and its rugged housing makes it this ideal for long-term deployments, recording water level and temperature up to 250-foot depths. The stainless steel model is ideal for shallow wells, streams, lakes, freshwater wetlands, while the corrosion-resistant Titanium model is well-suited to tidal areas, brackish wetlands, and other seawater environments. This logger's slim, compact design allows it to fit where larger instruments cannot—suiting it well to the small casing diameters groundwater wells often used in environmental remediation and regulatory monitoring applications.
A scalable solution that simplifies workflows and data collection from large numbers of wells for hydrologists, field technicians, mitigation specialists, and others, MX20 loggers can offload data to LI-COR Cloud® software with an accompanying MX Data Plan, which gives users access to a range of time-saving tools.
Key Features
- Research-grade accuracy supports groundwater studies, regulatory reporting, water resource management, scientific research and other professional applications
- Rugged construction endures for long-term monitoring up to 10 years
- Time-saving wireless data offload from integrated Bluetooth simplifies workflows
- HOBOconnect mobile app provides easy conversion to accurate water level reading, fully compensated for barometric pressure, temperature, and water density
- Cost-effective performance solution for monitoring large number of wells/locations
- Reliable absolute pressure sensor eliminates the need for vent tubes prone to clogging or freezing and desiccants
- Available in four depth ranges
- Compact-diameter design allows deployment in narrow wells while leaving room for suspension cables and other equipment
- Available in stainless steel (freshwater) and Titanium (saltwater) versions
- 3-point NIST-traceable calibration certificate included.
Benefits of LI-COR Cloud Monitoring Software
- Access monitoring data from anywhere
- Visualise, analyse, and share data with your team
- Securely upload and manage field data in LI-COR Cloud.
Requires a compatible mobile device or Windows computer and the HOBOconnect app (available from iTunes or Google Play).