HOBO MX Bluetooth Water Level Logger (30m / 100ft)

The MX20L series of water level loggers provides the high precision and accuracy on par with research-grade data loggers with an 0.1% measurement accuracy, but at a lower price point for monitoring water level and temperature. These loggers have Bluetooth technology to ensure easy and secure continues data transfer without needing cables or additional equipment.

Unlike some water level data loggers, you can use the MX20L series in both salt and fresh water. These loggers are made from polypropylene housing and non-vented design ensuring that remain intact in ready for prolonged use in harsh environments.

Setup and data transfer is made convenient because of the HOBOconnect app that you can install in your smartphone or Windows computer. Use the app to configure and install the logger using your smart device. These loggers also include a magnetic activation fob, allowing you to effortlessly "wake up" the device to enable Bluetooth communication or download data. The device records absolute pressure readings, converted to water level insights via HOBOconnect, and can be paired with another MX20L to compensate for barometric pressure changes.

Features:

- Equipped with a self-contained, non-vented design for seamless and straightforward deployment.
- Designed for versatility, suitable for both freshwater and saltwater environments, including wells, streams, lakes, wetlands, and tidal zones.
- Offers flexible depth measurement capabilities, available in models supporting depths of 4, 9, or 30 meters.
- Built with a robust ceramic pressure sensor capable of withstanding freezing conditions.
- Enables efficient data transfer through Bluetooth connectivity to the free HOBOconnect app.
- The HOBOconnect app ensures effortless extraction and clear visualization of water level data.
- Features an extended battery life of up to 10 years, with power-saving mode activated via a magnetic fob for Bluetooth data downloads.

Specifications

- Operation Range (Pressure (Absolute) and Water Level):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 207 kPa, 0° to 40°C (10 to 30 psia, 32° to 104°F)
- Burst Pressure: 310 kPa or 18 m depth (45 psia or 60 ft depth)
- Water Level Accuracy Typical error: ±0.1% FS, 1.0 cm (0.03 ft) Water ( With accurate reference water level measurement, known water density, accurate barometric compensation data, and a stable temperature environment.)
- 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 (Raw Pressure Accuracy: Absolute pressure sensor accuracy includes all sensor drift, temperature, and hysteresis-induced errors.)
- Resolution: <0.02 kPa Water (0.007 ft Water)
- Pressure Response Time (90%): <1 second at a stable temperature; measurement accuracy also depends on temperature response time (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%.)
- 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)
- 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): Full Memory: Approximately 3.5 minutes (1000,000 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: IP68