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MX2001-03
User guide
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HOBO MX2001-01, MX2001-01-Ti, MX2001-02, MX2001-03, MX2001-04 User guide

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HOBO® MX Water Level Logger (MX2001-0x) Manual
Pressure
Operation Range
Factory Calibrated Range
Burst
Water Level Accuracy* Raw Pressure Accuracy**
Resolution
Pressure Response Time (90%)
Pressure
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
Factory Calibrated Range
Burst
Water Level Accuracy*
Typical error: ±0.05% FS, 1.5 cm (0.05 ft) water Maximum error: ±0.1% FS, 3.0 cm (0.1 ft) water
Raw Pressure Accuracy**
Resolution
Pressure Response Time (90%)
Pressure (Absolute) and Water Level Measurements
Operation Range
Factory Calibrated Range
Burst Pressure
Water Level Accuracy* Raw Pressure Accuracy**
Resolution
Pressure Response Time (90%)***
HOBO MX Water Level
Logger
Models:
• MX2001-01 or MX2001-01-Ti (Titanium), 9-meter/30-foot depth)
• MX2001-02, 30-meter/100-foot depth
• MX2001-03, 76-meter/250-foot depth
• MX2001-04 or MX2001-04-Ti
(Titanium), 4-meter/13-foot
depth Note: Each model consists of a sensor end (MX2001-0x-S or MX2001-0x-Ti-S) and a top end (MX2001-TOP).
Included Items:
• Two AA 1.5 V Batteries
• Logger consisting of a top end
and sensor end connected by a cable in desired length (ordered separately)
Required Items:
• HOBOconnect app
• Mobile device with Bluetooth
and iOS, iPadOS®, or Android™
• Cable (CABLE-DR-xxx)
Accessory:
• Well cap (WELL-CAP-01)
The HOBO MX water level logger is used for monitoring changing water levels in a wide range of applications, including streams, lakes, wetlands, tidal areas, and groundwater. This Bluetooth® Low Energy-enabled logger is designed for wireless communication with a mobile device. Using the HOBOconnect™ app, you can easily configure the logger and read it out—all from its deployed location—to your phone or tablet where you can view the logged data or share it for further analysis. With the app, you can also set a
Specifications
(Absolute) and Water Level Measurements MX2001-01-S and MX2001-01-Ti-S
0 to 207 kPa (0 to 30 psia); approximately 0 to 9 m (0 to 30 ft) of
69 to 207 kPa (10 to 30 psia), 0° to 40°C (32° to 104°F)
Pressure 310 kPa (45 psia) or 18 m (60 ft) depth
Typical error: ±0.05% FS, 0.5 cm (0.015 ft) water
±0.3% FS, 0.62 kPa (0.09 psi) maximum error
<0.02 kPa (0.003 psi), 0.21 cm (0.007 ft) water
(Absolute) and Water Level Measurements MX2001-02-S
69 to 400 kPa (10 to 58 psia), 0° to 40°C (32° to 104°F)
Pressure 500 kPa (72.5 psia) or 40.8 m (134 ft) depth
±0.3% FS, 1.20 kPa (0.17 psi) maximum error
<0.04 kPa (0.006 psi), 0.41 cm (0.013 ft) water
0 to 850 kPa (0 to 123.3 psia); approximately 0 to 76.5 m (0 to
69 to 850 kPa (10 to 123.3 psia), 0° to 40°C (32° to 104°F)
1,200 kPa (174 psia) or 112 m (368 ft) depth
±0.3% FS, 2.55 kPa (0.37 psi) maximum error
<0.085 kPa (0.012 psi), 0.87 cm (0.028 ft) water
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
Maximum error: ±0.1% FS, 1.0 cm (0.03 ft) water
*** <1 second at a stable temperature
3,000 m (10,000 ft) of altitude
*** <1 second at a stable temperature
MX2001-03-S
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
Typical error: ±0.05% FS, 3.8 cm (0.125 ft) water Maximum error: ±0.1% FS, 7.6 cm (0.25 ft) water
<1 second at a stable temperature
19389-N
Specifications (continued)
Pressure
Operation Range Factory Calibrated Range
Burst Pressure
Water Level Accuracy* Raw Pressure Accuracy**
Resolution
Pressure Response Time (90%)
Barometric Pressure (
Operation Range
Temperature Calibrated Range
Accuracy
Water Level Accuracy* Resolution
Response Time
Stability (Drift)
Temperature Measurements (All
Operation Range
Accuracy
Resolution
Response Time (90%)
Stability (Drift)
Logger
Operating Range
Radio Power
Transmission Range
Wireless Data Standard
Logging Rate
Logging Modes
Memory Modes
Start Modes
Stop Modes
Time
Battery
Battery Life
Memory
Full Memory Download Time
Approximately 2 minutes; may take longer the further the device is from the top end of the logger
Dimensions
(Absolute) and Water Level Measurements MX2001-04-S and MX2001-04-Ti-S
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)
69 to 145 kPa (10 to 21 psia), 0° to 40°C (32° to 104°F)
310 kPa (45 psia) or 18 m (60 ft) depth
Typical error: ±0.075% FS, 0.3 cm (0.01 ft) water
±0.3% FS, 0.43 kPa (0.063 psi) maximum error
<0.014 kPa (0.002 psi), 0.14 cm (0.005 ft) water
*** <1 second at a stable temperature
MX2001-TOP)
66 to 107 kPa (9.57 to 15.52 psia)
-20 to 50°C (-4 to 122°C)
±0.2 kPa (±0.029 psi) over full temperature range at fixed pressure; maximum error ±0.5% FS
Typical error: ±0.075% FS, 0.3 cm (0.01 ft) water
<0.01 kPa (0.0015 psi)
<1 second at stable temperature
<0.01 kPa (0.0015 psi) per year
HOBO MX Water Level Logger (MX2001-0x) Manual
of water at 3,000 m (10,000 ft) of altitude
Maximum error: ±0.15% FS, 0.6 cm (0.02 ft) water
Maximum error: ±0.15% FS, 0.6 cm (0.02 ft) water
Sensor End Models MX2001-0x-S and MX2001-0x-Ti-S)
-20° to 50°C (-4° to 122°F)
±0.44°C from 0° to 50°C (±0.79°F from 32° to 122°F), see Plot A
0.1°C at 25°C (0.18°F at 77°F), see Plot A
5 minutes in water (typical)
0.1°C (0.18°F) per year
-20° to 50°C (-4° to 122°F)
1 mW (0 dBm)
Approximately 30.5 m (100 ft) line-of-sight
Bluetooth Low Energy (Bluetooth Smart®)
1 second to 18 hours
Fixed interval, multiple intervals with up to 8 user-defined logging intervals and durations, or burst
Wrap when full or stop when full
Immediate, date & time, or next interval
When memory full, date & time, or after a set logging period
Accuracy ±1 minute per month 0° to 50°C (32° to 122°F)
Two AA, 1.5 V alkaline batteries, user replaceable
1 year, typical with logging interval of 1 minute. Faster logging and/or statistics sampling intervals, entering
256 KB memory (30,000 sets of measurements)
Top end (MX2001-TOP): 2.54 cm (1.0 inches) diameter, 28.9 cm (11.4 inches) length; mounting hole 7.6 mm
burst logging mode, excessive readouts, checking of Full Status Details, and remaining connected with the app will impact battery life.
(0.3 inches) diameter
Sensor end (MX2001-0x-S and MX2001-0x-Ti-S: 2.54 cm (1.0 inches) diameter, 9.91 cm (3.9 inches) length
Note: The length of the water level logger cable (CABLE-DR-xxx) can vary -0% to +3% +10 cm (3.9 inches) from the length ordered. The logger adds 38.8 cm (15.3) inches to the length of the cable ordered.
1-800-LOGGERS 2 www.onsetcomp.com
Specifications (continued)
Weight
Wetted Materials
Environmental Rating
End cap with Top end
Sensor end
Water level logger cable Pressure sensors (inside)
Temperature sensor (inside)
Password reset button
LED (Not Visible)
Battery holders
Plot A
HOBO MX Water Level Logger (MX2001-0x) Manual
Top end (MX2001-TOP): PVC housing, Polycarbonate end cap, Viton O-ring
Top end: NEMA 6, IP67
* Water Level Accuracy: With accurate reference water level measurement, known water density,
and a stable temperature environment. System Water Level Accuracy equals the sum of the Barometric Water Level Accuracy plus the selected sensor end Water Level Accuracy.
** 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. There can be up to 0.5% of additional error due to rapid temperature changes. Measurement accuracy also depends on temperature response time.
Logger Components and Operation
Top end (MX2001-TOP): Approximately 136 g (4.78 oz) in air Stainless sensor end (MX2001-0x-S): Approximately 106 g (3.74 oz) in air; approximately 53.9 g (1.9 oz) in fresh water Titanium sensor end (MX2001-0x-Ti-S): Approximately 80 g (2.83 oz) in air; approximately 37 g (1.3 oz) in fresh water
Stainless sensor end (MX2001-0x-S): Acetal housing, Viton and Buna-N O-rings, ceramic sensor in stainless steel end cap
Titanium sensor end (MX2001-0x-Ti-S): Acetal housing, Viton and Buna-N O-rings, ceramic sensor in Titanium end cap
Cable (CABLE-DR-XXX): Polycarbonate end cap, PVC end cap, nylon collar nut, Viton O-rings, polyurethane jacket
Sensor end: IP68
The CE Marking identifies this product as complying with all relevant directives in the European Union (EU).
See last page
The MX water level logger consists of a top end and a sensor end that is connected by a water level logger cable. The three components work together to allow for wireless transfer of data to the app on a mobile phone or tablet. This is an overview of each main component and the internal components in the
mounting hole
top end:
• Top end. This contains the Bluetooth wireless
communication and two AA batteries. This top end unit is suspended from the top of the well using the mounting hole in the end cap (see Deploying the Logger).
• Sensor end. This measures the pressure and temperature
in the water. The nose cone on the sensor end houses the pressure sensors and the body of the sensor end houses the temperature sensor.
• Water level logger cable. This is the cable that connects
the top end to the sensor end. Data measured by the sensor is transmitted through the cable to the top end where it is logged for later upload to a mobile phone or tablet (see Configuring the Logger).
• Battery holders. Two AA batteries are installed in the
battery holders in the top end (see Battery Information).
• Password reset button. Press the button between the two
batteries in the top end to reset the logger password to the factory default (see Setting a Logger Password).
Disassembled top end
• LED. Remove the end cap from the top end to view the
red LED below the top edge of the circuit board. This LED blinks every second while logging and every 8 seconds
1-800-LOGGERS 3 www.onsetcomp.com
HOBO MX Water Level Logger (MX2001-0x) Manual
Logger
Plug this portion of the cable Plug this portion of the cable with the
when the logger is configured to start on a specific date/time or on the next logging interval. The LED will also blink once when you press the password reset button and blink quickly multiple times when the batteries are installed.

When the three components are deployed together, you can then configure the logger or offload data to your mobile device without having to pull the logger up to the surface.

Factory Calibration

The pressure sensors in the sensor end are individually calibrated. During calibration, raw pressure sensor data is collected at multiple pressures and temperatures over the calibrated range of the logger (see Specifications). This data is used to generate calibration coefficients that are stored in the sensor end’s non-volatile memory. The calibration coefficients are then checked to be sure that the logger meets its stated accuracy over the calibrated range. The pressure sensor can be used at pressures and temperatures that are outside of the calibrated range, but the accuracy cannot be guaranteed.
Important: Never exceed the burst pressure of the sensor!
Configuring the Logger
Follow these steps to begin using the logger. After completing steps 1–4, it is recommended that you perform a trial run of steps 5 through 12 before deploying the logger.
Important: When assembling the logger or attaching the cable, make sure the O-rings and mating housing surfaces are clear of any debris. Any contamination of these surfaces can cause leaks that will lead to logger failure.
1. Install the batteries in the top end. See Battery Information for details.
2. Connect the logger components. Connect the top end to the sensor end with the water level logger cable as shown below. The end of the cable with the longer housing connects to the top end as shown below.
with the longer housing into the top end and screw to tighten (hand tight)
smaller housing into the sensor end and screw to tighten (hand tight)
3. Download the app. Go to the App Store® or Google Play™ and download HOBOconnect to your phone or tablet.
4. Open the app. Enable Bluetooth in your device settings if prompted.
5. Determine the logger is within range. Tap Devices. The logger should appear in the list of devices (note that the serial number shown in the app is for the top end of the logger). If the logger does not appear, make sure it is within
range of your device. Note that sensor readings are displayed as “--“ when the logger is stopped.
6. Deploy the logger if ready. If you are ready to deploy the
logger, place it in the deployment location (see Deploying the Logger for deployment guidelines). Otherwise, skip deployment and complete the following steps as a test.
7. Connect to the logger. Tap the logger in the app to connect to it. Tips for connecting:
• Make sure the top end of the logger is within range of
your mobile device. The range for successful wireless communication is approximately 30.5 m (100 ft) with full line-of-sight.
• If your device can connect to the logger intermittently or
loses its connection, move closer to the top end of the logger, within sight if possible.
• If the logger appears in the app, but you cannot connect
to it or if you are experiencing persistent connection problems, close the app and power cycle the mobile device (turn it off, wait a minute, and turn it back on). This forces the previous Bluetooth connection to close.
8. Configure the logger. Once connected to the logger,
tap to set up the logger.
9. Set the Reference Water Level and Water Density.
a. Under Deployment Information, tap Reference Water
Level and enter the current water level as the reference level in meters or feet. Water levels that are below the reference point should be entered as negative values. The reference water level entered will be associated with the first data point once logging begins to determine the correction factor to be used for water level data.
b. Tap water density and select one from the list for the
deployment or enter your own value under Manual Input.
c. Tap Save to return to the Configuration screen.
10. Enable the desired sensors. Scroll down in the Configuration screen to select the measurement parameters to be logged. Differential pressure must be enabled to calculate water level. Temperature must be enabled to log absolute pressure. Temperature must also be enabled if you selected the water density option “Fresh Water adjusted for Temp” because the temperature values are used to calculate the water density.
11. Finish configuring the logger. Select any of the following logger settings as desired. The following table provides an overview of the settings. For complete details, see the app user’s guide at www.onsetcomp.com/hoboconnect.
Setting Action
Name
Group Tap Group to add the logger to a group (optional).
Enter a name for the logger (optional). If no name is entered, the logger serial number is used.
Tap Save.
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