Factory Calibration; Configuring The Logger - Hobo MX Series Manual

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.
Plug this portion of the cable
with the longer housing into
the top end and screw to
tighten (hand tight)
Plug this portion of the cable with the
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.
1-508-759-9500 (U.S. and International)
1-800-LOGGERS (U.S. only)
HOBO MX Water Level Logger (MX2001-0x) Manual
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.
Logger
Setting Action
Name Enter a name for the logger (optional). If no name
is entered, the logger serial number is used.
Group Tap Group to add the logger to a group (optional).
Tap Save.
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