Jeroen Smits
Manager Product- en Sector Specialists
HOBO MX20L-04 Water Level Data Logger
The HOBO MX20L Water Level Logger is an advanced measurement instrument for monitoring water levels and temperatures in various underwater environments.
Enhanced Functionality
- Bluetooth Integration: Allows fast and reliable data transfer.
- Eliminates the need for a base station or shuttle for field data retrieval.
Measurement Range and Accuracy
- Options for depth measurements: 4, 9, or 30 meters (13, 30, or 100 feet).
- Measurement accuracy of 0.1%.
Robust Design
- Durable polypropylene housing suitable for both freshwater and saltwater.
- Non-vented design for easy and reliable deployment.
Ease of Use
- Magnetic Activation Tag: Simplifies activation of Bluetooth communication.
- Included tag with cord prevents loss during fieldwork.
Data Processing
- Logs absolute pressure, later converted to water level readings using HOBOconnect software.
- Capability to use a second MX20L logger as a barometric reference.
The MX20L offers a comprehensive solution for accurate and continuous water level monitoring across a wide range of applications, including lakes, rivers, wetlands, and tidal areas.
Technical specifications
Pressure (Absolute) and Water Level Measurements
MX20L-01
Operating Range:
0 to 207 kPa (0 to 30 psia); approximately 0 to 9 m (0 to 30 ft) water depth at sea level, or 0 to 12 m (0 to 40 ft) at 3,000 m (10,000 ft) 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:
Typical Error: ±0.1% FS, 1.0 cm (0.03 ft) water.
Maximum Error: ±0.2% FS, 2.0 cm (0.06 ft) water.
Raw Pressure Accuracy:
±0.3% FS, 0.62 kPa (0.09 psi) maximum error.
Resolution:
<0.02 kPa water, 0.007 ft water.
Response Time (90%):
<1 second at stable temperature.
MX20L-02
Operating Range:
0 to 400 kPa (0 to 58 psia); approximately 0 to 30.6 m (0 to 100 ft) water depth at sea level, or 0 to 33.6 m (0 to 111 ft) at 3,000 m (10,000 ft) 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.
MX20L-04
Operating Range:
0 to 145 kPa (0 to 21 psia); approximately 0 to 4 m (0 to 13 ft) water depth at sea level, or 0 to 7 m (0 to 23 ft) at 3,000 m (10,000 ft) 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: ±0.1% FS, 0.4 cm (0.013 ft) water.
Maximum 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.
Temperature Measurements (All Models)
Operating Range:
-20° to 50°C (-4° to 122°F).
Accuracy:
±0.2°C (±0.36°F) from 0° to 50°C (32° to 122°F).
Resolution:
0.10°C (0.18°F) at 25°C (77°F).
Response Time (90%):
10 minutes in water (typical).
Stability (Drift):
0.1°C (0.18°F) per year.
Logger Specifications
Wireless Standard:
Bluetooth 5 LE.
Range:
Approximately 30.5 m (100 ft) line-of-sight.
Battery:
Type: 2/3 AA, 3.6 Volt lithium, factory replaceable.
Life:
3 years with 1-minute logging, Bluetooth always on.
7 years with 1-minute logging, Bluetooth and LED off.
10 years with 5-minute logging, Bluetooth and LED off.
Memory:
Non-volatile, approximately 400,000 sets of pressure and temperature readings.
Data Download Time:
Full memory: ~3.5 minutes with Bluetooth 5+.
1,000,000 measurements in <1 minute.
Physical and Environmental
Dimensions:
Diameter: 3.18 cm (1.25 inch); Length: 15.24 cm (6.0 inch).
Mounting Hole Diameter: 6.3 mm (0.25 inch).
Weight:
154 g (5.43 oz) in air; 53.9 g (1.9 oz) in freshwater.
Materials:
Polypropylene housing, Viton and Buna-N O-rings, ceramic sensor in acetal end cap, stainless steel screws suitable for saltwater.
Environmental Rating:
IP68.
Logging Modes
Fixed interval, burst, or multiple intervals with up to 8 user-defined intervals.
Logging intervals: 1 second to 18 hours.
Start and Stop Modes
Start Modes:
Immediate, next interval, date & time, button start (via fob or app).
Stop Modes:
Full memory, never stop (overwrite oldest data), date & time, or after a set logging period.
Pause:
Pause and resume with the HOBOconnect app.
Alarms
Logs high- or low-alarm events.
Alarm status visible in the HOBOconnect app.
The HOBO MX20L series provides highly accurate and reliable water level and temperature monitoring for a wide range of environmental and industrial applications.