HOBO MX2501 MX pH and Temperature Logger Manual
U.S. and International Sales: 1-508-759-9500 2
www.onsetcomp.com
Specifications (continued)
Battery Life
1 year typical at 25°C (77°F) with logging interval of 1 minute and
Bluetooth Always On selected in software.
3 years typical at 25°C (77°F) with logging interval of 1 minute and
Bluetooth Always Off selected in software.
Faster logging intervals and statistics sampling intervals, burst logging,
remaining connected with the app, excessive downloads, and paging
may impact battery life.
pH Electrode Typical
Minimum Life
6 months in sample with ionic strength
≥
100 µS/cm
Memory
152 KB (43,300 measurements, maximum)
Full Memory Download Time
Approximately 60 seconds; may take longer the further the mobile
device is from the logger
Dimensions
22.86 x 4.27 cm (9.0 x 1.68 inches); mounting hole 0.64 cm (0.25 inches)
Weight
268.2 g (9.46 oz)
Wetted Materials
Logger: PVC housing and sensor end cap, polycarbonate closure caps
and mounting end cap with a TPE switch
pH electrode: plastic-bodied with Pellon® junctions and gel electrolyte,
glass pH sensor bulb
Environmental Rating
IP68
The CE Marking identifies this product as complying with all relevant
directives in the European Union (EU).
See last page
Logger Components and Operation
Anti-Biofouling Copper Guard:
Use this guard to protect the pH
electrode when deploying the logger in water prone to
biofouling (see
Deploying and Mounting the Logger
).
Closure Caps:
These caps are screwed onto the sensor end and
the mounting end (or top end) of the logger.
Sensor End Cap:
This is the bottom end of the logger where the
pH electrode is installed, and the temperature sensor and
water detection screws are located.
Temperature Sensor:
The temperature sensor is located at the
base of the sensor end cap.
Water Detection Screws:
These two screws on the sensor end
cap can detect the presence of water.
pH Electrode:
This is the electrode that is plugged into the
logger. The clear plastic end houses a glass pH sensor bulb that
must always be placed in storage solution when not deployed
in water. See
Installing the pH Electrode
for details.
Logger Housing:
This is the main body of the logger.
Battery Holder:
This is where one AA battery is installed under
a battery strap (see
Battery Information
).
Battery Holder
Sensor
End Cap
Anti-Biofouling
Copper Guard
Closure Cap
Closure Cap
Logger Housing
Mounting
Hole
Switch
Reed Switch
LEDs (Not
Visible)
pH Electrode
Water Detection
Screw (one of two)
Temperature
Sensor
Disassembled logger
Assembled logger with copper guard installed
Assembled logger without copper guard installed
Mounting (or
Top) End Cap
