HOBO MX pH and Temperature Logger (MX2501) Manual
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the switch on the logger for 1 second to wake it up. If the
logger was configured with Bluetooth Off Water Detect and
it is deployed in water, remove it from the water.
3. Once connected, tap Readout. The data file from the logger
is saved to your device.
4. Tap the Data Files icon to view a mini-graph of the
downloaded data.
5. Tap the mini-graph to view a larger version of the graph or
to share the file. The graph shows the pH and temperature
series by default. To view the mV series, tap
in the
upper right corner and tap mV. For additional details on
viewing graphs and sharing data, see the
HOBOmobile
User’s Guide
.
Data can also be uploaded automatically to HOBOlink, Onset’s
web-based software. Tap the Settings icon in HOBOmobile to
enable the HOBOlink Upload Data option. See the
HOBOmobile
User’s Guide
for more details on this setting and see the
HOBOlink help for details on working with data in HOBOlink.
Logger Events
The logger records the following internal events to track logger
operation and status. To plot events in HOBOmobile, tap a
mini-graph and then tap
. Select the events you wish to plot
and then tap
again. You can also view events in shared or
exported data files.
Internal Event Name
Definition
Host Connect
The logger was connected to the mobile
device.
Started
The logger started logging.
Stopped
The logger stopped logging.
Calibration End
pH calibration ended while the logger was
logging.
Calibration Cancel
pH calibration was canceled while the
logger was logging.
Calibration Values
The slope and offset values that were set
during calibration while the logger was
logging.
Calibration Buffers
The buffers used during calibration while
the logger was logging.
Alarm
Tripped/Cleared
An alarm has occurred because the reading
was outside the alarm limits or back within
range.
Note:
Although the reading may
have returned to a normal range during
logging, an alarm cleared event will not be
logged if the logger was set up to maintain
alarms until reconfigured.
New Interval
The logger has switched to logging at the
burst logging rate or back to the normal
rate.
Water Detect
The logger has been placed in water or
removed from water.
Low Power
The battery level dropped below 0.8 V.
Safe Shutdown
The battery level dropped below a safe
operating voltage and the logger
Internal Event Name
Definition
performed a safe shutdown with all data
stored in memory.
Deploying and Mounting the Logger
Important:
The pH sensor must be kept in storage solution
when not being calibrated or deployed in water
.
Follow these guidelines when deploying the logger:
•
Remove the storage solution bottle and bottle cap from
the logger before deploying it.
•
If your water sample is prone to biofouling, insert the
optional copper anti-biofouling guard over the pH sensor
as shown. Gently twist the copper guard so that the holes
line up with the holes in the sensor end cap and pH
electrode. Do not use the copper guard when the pH
sensor is being calibrated, placed in the storage solution
bottle or similar-sized container with still water, or in
water where copper can affect the environment.
•
There are two mounting options:
Attach a nylon cord or other strong cable to the
mounting hole to deploy the logger.
Alternatively, secure the logger to a pipe or similar
surface using cable ties wrapped around the two large
grooves in the logger housing.
•
The logger should be appropriately secured and
protected depending on water conditions and desired
measurement location.
Optional copper guard
installed to protect
against biofouling
Line up holes in copper guard with holes
in sensor end cap and pH electrode
Use this hole for
mounting the logger
Use cable ties around these
grooves for mounting the logger
