Onset HOBO MX Manual
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Onset HOBO MX Manual

Ph and temperature logger
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HOBO® MX pH and Temperature Logger (MX2501) Manual
HOBO MX pH and
Temperature Logger
MX2501
Included Items:
• pH electrode in solution
• Electrode storage solution
and cap
• Anti-fouling copper guard
Required Items:
• HOBOmobile app
• Device with iOS and
Bluetooth
Accessories:
• Calibration beaker
(MX2500-CAL-BKR)
• Calibration kit with three
250 mL bottles of pH 4.01,
7.01, and 10.01 solution
(MX2500-CAL-KIT)
• pH 4.01 calibration
solution, 250 mL (MX2500-
CAL-4)
• pH 7.01 calibration
solution, 250 mL (MX2500-
CAL-7)
• pH 10.01 calibration
solution, 250 mL (MX2500-
CAL-10)
• Electrode cleaning solution
(MX2500-CLEAN-SOLN)
• Replacement pH electrode
(MX2500-ELECTRODE)
• Replacement end cap
(MX2500-END-CAP)
• Replacement anti-fouling
copper guard (MX2500-
GUARD)
• Additional electrode
storage solution (MX2500-
STORE-SOLN) and cap
(MX2500-STORE-CAP)
22511-1
The HOBO MX pH and Temperature logger is designed for long-term monitoring of pH in
aquatic systems. With a replaceable pH electrode and anti-fouling copper guard, this durable
logger can be deployed in both fresh salt water environments. This logger is Bluetooth® Low
Energy-enabled logger for wireless communication with a mobile device. Using the
HOBOmobile® app, you can easily calibrate and configure the logger, download logged data to
your phone or tablet, or automatically upload the data to HOBOlink® for further analysis. You
can also configure the logger to calculate statistics, set up alarms to trip at specific thresholds,
or enable burst logging in which data is logged at a faster interval when sensor readings are
above or below certain limits.
Specifications
pH Sensor
Range
Accuracy
Resolution
Temperature Sensor
Range
Accuracy
Resolution
Logger
Operating Range
Waterproof
Water Detection
Radio Power
Transmission Range
Wireless Data Standard
Logging Rate
Logging Modes
Memory Modes
Start Modes
Stop Modes
Time Accuracy
Battery Type
Battery Life
pH Electrode Life
Memory
in pH
2.00 to 12.00 pH
±0.10 pH
0.01 pH
-2° to 50°C (28.4° to 122°F)
±0.2°C (±0.36°F)
0.04°C (0.072°F)
-2° to 50°C (28.4° to 122°F)
To 40 m (131.2 ft)
Water conductivity level of 100 µS/cm or greater necessary for reliable
detection of water. Deionized water or water below 100 µS/cm may not
be detected.
The water conductivity circuit may not reliably detect water that has
frozen around the electrodes, i.e. below 0°C (32°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 (normal, statistics) or burst
Wrap when full or stop when full
Immediate, push button, date & time, or next interval
When memory full, push button, date & time, or after a set logging
period
±1 minute per month 0° to 50°C (32° to 122°F)
One AA 1.5 Volt, user replaceable
1 year typical at 25°C (77°F) with logging interval of 1 minute and
Bluetooth Always Off disabled in software.
2 years typical at 25°C (77°F) with logging interval of 1 minute and
Bluetooth Off Water Detect enabled in software.
3 years typical at 25°C (77°F) with logging interval of 1 minute and
Bluetooth Always Off enabled in software.
Faster logging intervals and statistics sampling intervals, burst logging,
remaining connected with the app, excessive downloads, and paging may
impact battery life.
6 months
152 KB (43,300 measurements, maximum)
in mV
-1,000 to 1,000 mV
±0.2 mV
0.5 mV

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Summary of Contents for Onset HOBO MX

  • Page 1 HOBO® MX pH and Temperature Logger (MX2501) Manual The HOBO MX pH and Temperature logger is designed for long-term monitoring of pH in aquatic systems. With a replaceable pH electrode and anti-fouling copper guard, this durable logger can be deployed in both fresh salt water environments. This logger is Bluetooth® Low Energy-enabled logger for wireless communication with a mobile device.
  • Page 2 HOBO MX2501 MX pH and Temperature Logger Manual Specifications (continued) Full Memory Download Time Approximately 60 seconds; may take longer the further the device is from the logger Dimensions 22.86 x 4.27 cm (9.0 x 1.68 inches) Weight 268.2 g (9.46 oz) Wetted Materials PVC housing and sensor guard, polycarbonate end caps and mounting end with a TPE switch, plastic pH electrode...
  • Page 3 HOBO MX pH and Temperature Logger (MX2501) Manual To install the pH electrode in the logger: Do not twist or turn the sensor guard as you push the pH electrode straight into position. 1. Unscrew the end cap over the sensor end of the logger.
  • Page 4 HOBO MX pH and Temperature Logger (MX2501) Manual • Full Status Details. Check the battery level and view the 7. Keep the sensor in the storage solution as shown until you are ready to calibrate it and deploy the logger.

  • Page 5: Configuring The Logger

    HOBO MX pH and Temperature Logger (MX2501) Manual • On Date/Time. Logging will begin on a date and time you 4. Follow the instructions in the app. specify. Select the Date and time and tap Done. 5. Once calibrated, follow the instructions in the next section for Configuring the Logger.

  • Page 6: Setting Up Alarms

    HOBO MX pH and Temperature Logger (MX2501) Manual This will wake up the logger when you need to connect to it. This option uses the least battery power. • Bluetooth Off Water Detect. The logger will not advertise when the presence of water is detected. Once...
  • Page 7 HOBO MX pH and Temperature Logger (MX2501) Manual record is 84.990°F and the closest value to 32°F is slider to the reading that will trigger burst logging or tap the 32.043°F. In addition, alarms can trip or clear when the value field and type a specific reading.

  • Page 8: Setting A Password

    HOBO MX pH and Temperature Logger (MX2501) Manual logged and the burst condition is cleared, even if the sampling rate, then the logger will take 12 sample readings actual high or low condition has not cleared. between each logging interval (one sample every 5 seconds for a minute) and use the 12 samples to record the resulting statistics at each 1-minute logging interval.

  • Page 9: Battery Information

    HOBO MX pH and Temperature Logger (MX2501) Manual 6. Tap the mini-graph to view a larger version of the graph or Follow these guidelines when deploying the logger: to share the file. See the HOBOmobile User’s Guide for • Use the copper anti-fouling guard when deploying the details on viewing graphs and sharing data.
  • Page 10 HOBO MX pH and Temperature Logger (MX2501) Manual To install or replace the battery: Push the mounting tab until the notch is fully seated in the groove as shown. 1. Unscrew the end cap on the mounting end of the logger.
  • Page 11 © 2018 Onset Computer Corporation. All rights reserved. Onset, HOBO, and HOBOlink are registered trademarks of Onset Computer Corporation. App Store is a service mark of Apple Inc. Bluetooth and Bluetooth Smart are registered trademarks of Bluetooth SIG, Inc. All other trademarks are the property of their respective companies.

This manual is also suitable for:

Mx2501

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