HOBO MX pH and Temperature Logger (MX2501) Manual
U.S. and International Sales: 1-508-759-9500 8
www.onsetcomp.com
Only the device used to set the password can then connect to
the logger without entering a password; all other devices are
required to enter the password. For example, if you set the
password for the logger with your tablet and then try to
connect to the logger later with your phone, you must enter
the password on the phone but not with your tablet. Similarly,
if others attempt to connect to the logger with different
devices, they are also required to enter the password. To reset
a password, press the switch on the logger for 10 seconds or
connect to the logger and tap Manage Password and tap Reset.
Downloading Data From the Logger
To download data from the logger:
1.
Tap Devices.
2.
Tap Download Data. The logger downloads data to the
phone, tablet, or computer.
3.
Once the download is complete, tap Done to return to the
previous page or tap Export and Share to save the file in the
specified format.
4.
When the export file has successfully been created, tap
Done to return to the previous page or tap Share to use
your device’s usual modes of sharing.
You can also upload data automatically to HOBOlink, Onset’s
web-based software, using the app or the MX gateway. For
details, see the HOBOconnect User Guide and see the HOBOlink
help for details on working with data in HOBOlink.
Logger Events
The logger records the following events to track logger
operation and status. You can view events in exported files or
plot events in the app.
To plot events, tap Data and select a file to open.
Tap (if applicable) and then tap
. Select the events you
want to plot and tap OK.
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.
Internal Event Name
Definition
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
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:
•
If the logger is in storage solution, remove the clear
storage cap from the logger and replace it with a closure
cap as shown in the next diagram 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 or in storage solution, or if the
sensor is placed in a very small container with still water
or in water where copper can affect the environment.
Line up holes in copper guard with holes
in sensor end cap and pH electrode
Optional copper guard
installed to protect
against biofouling
Make sure the closure
cap is installed before
deploying the logger
