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Hobo MX2501 Manual

Hobo MX2501 Manual

Mx 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 installed and
submerged in storage
solution
• Extra electrode storage
solution
• Anti-biofouling copper guard
• Silicone-based O-ring grease
and foam swab
Required Items:
• HOBOconnect app
• Mobile device with
Bluetooth and iOS, iPadOS®,
or Android™, or a Windows
computer with a native BLE
adapter or supported BLE
dongle
• Deionized or distilled water
and squirt bottle
• Calibration solutions
Accessories:
• Replacement pH electrode
(MX2500-ELECTRODE)
• Calibration kit with three
bottles: pH 4.01, 7.00, and
10.00 calibration solution
(MX2500-CAL-KIT) and
calibration beakers
(MX2500-CAL-BKR)
• Maintenance kit with
calibration kit plus storage
solution (MX2500-MAINT-
KIT)
• pH 4.01 calibration solution
(MX2500-CAL-4)
• pH 7.00 calibration solution
(MX2500-CAL-7)
• pH 10.00 calibration solution
(MX2500-CAL-10)
• Electrode storage solution
(MX2500-STORE-SOLN)
• Replacement sensor end cap
(MX2500-END-CAP)
• Replacement anti-biofouling
copper guard (MX2500-
GUARD)
• Replacement clear storage
cap (MX2500-STORAGE-CAP)
22511-Q
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-biofouling copper guard, this
durable logger can be deployed in both fresh and salt water environments. This logger is
Bluetooth® Low Energy (BLE)-enabled for wireless communication with a mobile device or
computer. Using the HOBOconnect® app, you can easily calibrate and configure the logger,
download logged data to your phone, tablet, or computer, 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 sensor readings are logged
at a faster interval when the pH or temperature rises above or falls below certain limits.
Specifications
pH Sensor
Range
Accuracy
Resolution
Response Time
Sample Ionic Strength
Temperature Sensor
Range
Accuracy
Resolution
Response Time
Logger
Operating Range
Buoyancy
Waterproof
Water Detection
Radio Power
Transmission Range
Wireless Data Standard
Logging Rate
Logging Modes
Memory Modes
Start Modes
Stop Modes
Time Accuracy
Battery Type
in pH
2.00 to 12.00 pH
±0.10 pH units within ±10°C of
temperature at calibration
0.01 pH
1 minute typical to 90% at constant temperature in stirred water
≥ 100 µS/cm
-2° to 50°C (28.4° to 122°F)
±0.2°C (±0.36°F)
0.024°C at 25°C (0.04°F at 77°F)
7 minutes typical to 90% in stirred water
-2° to 50°C (28.4° to 122°F) — non-freezing
Fresh water: 13.6 g (0.48 oz) negative
Salt water: 19.6 g (0.69 oz) negative
To 40 m (131.2 ft)
Water conductivity level of 100 µS/cm or greater is 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 in air
Bluetooth Low Energy (Bluetooth Smart)
1 second to 18 hours
Fixed Interval or Burst
Never Stop (Overwrites Old Data) or Stop When Full
On Save (immediate), On Next Interval, On Push Button, On Date/Time
Never Stop (Overwrites Old Data), On Date/Time, After a specified
about of time, Stop When Memory Fills
±1 minute per month 0° to 50°C (32° to 122°F)
One AA 1.5 Volt, user-replaceable
in mV
-512 to 512 mV
±0.20 mV
0.02 mV

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Summary of Contents for Hobo MX2501

  • 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-biofouling copper guard, this durable logger can be deployed in both fresh and salt water environments. This logger is Bluetooth®...
  • Page 2 HOBO MX2501 MX pH and Temperature Logger Manual 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.
  • Page 3 HOBO MX pH and Temperature Logger (MX2501) Manual • If the logger appears in the app, but you cannot connect Reed Switch: This is used in conjunction with the magnetic switch on the mounting end cap. to it, close the app and then power down your device to force the previous Bluetooth connection to close.
  • Page 4 HOBO MX pH and Temperature Logger (MX2501) Manual sure you have the time to complete the 2. If you removed the clear storage cap, screw the closure cap entire update process, which requires that onto the logger. the logger remains connected to the device during the upgrade.
  • Page 5: Configuring The Logger

    HOBO MX pH and Temperature Logger (MX2501) Manual Temperature pH 4.01 pH 7.00 pH 10.00 Notes: °C °F Buffer Buffer Buffer • The date of the last calibration, the slope and offset 4.01 6.99 9.95 values, and the buffers used for the calibration are listed under the Deployment Information in the Configuration 4.02...
  • Page 6: Setting Up Alarms

    HOBO MX pH and Temperature Logger (MX2501) Manual 9. Tap Pause Options, then select Pause On Button Push to time during logging. For example, if the high alarm is set specify that you can pause the logger by pressing its switch to 85°F and the duration is set to 30 minutes, the alarm...
  • Page 7: Setting A Password

    HOBO MX pH and Temperature Logger (MX2501) Manual • The standard deviation from the average for all sampled 4. Set the burst logging interval, which must be faster than the logging interval. Keep in mind that the faster the burst...
  • Page 8 HOBO MX pH and Temperature Logger (MX2501) Manual Internal Event Name Definition Only the device used to set the password can then connect to the logger without entering a password; all other devices are New Interval The logger has switched to logging at the required to enter the password.
  • Page 9 HOBO MX pH and Temperature Logger (MX2501) Manual • There are two mounting options: in the previous bullet can help to extend its life. It is recommended that you replace the pH electrode after 6  Attach a nylon cord or other strong cable to the months of continuous use or when the slope and offset mounting hole to deploy the logger.
  • Page 10: Battery Information

    HOBO MX pH and Temperature Logger (MX2501) Manual 3. Use a foam swab dipped in water to clean the internal O- 8. If you will be calibrating the logger immediately: screw the rings. Use the foam swab to spread a small dot of silicone-...
  • Page 11 HOBO MX pH and Temperature Logger (MX2501) Manual To install or replace the battery: 4. Remove the battery strap. Insert a flat-head screwdriver into the hole on the strap to lift it off the battery. 1. Wipe the logger clean and dry it completely.
  • Page 12 The service related to human safety is not allowed because this device may have the possibility of the radio interference. © 2018–2022 Onset Computer Corporation. All rights reserved. Onset, HOBO, HOBOconnect, and HOBOlink are registered trademarks of Onset Computer Corporation. App Store, iPhone, iPad, and iPadOS are service marks or registered trademarks of Apple Inc.