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Hobo MX Series 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 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™
• 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-O
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-enabled for wireless communication with a mobile device. Using the
HOBOconnect™ 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 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 (normal, statistics) or burst
Wrap when full or stop when full
Immediate, push button, date & time, or next interval
When memory is 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
in mV
-512 to 512 mV
±0.20 mV
0.02 mV

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Summary of Contents for Hobo MX Series

  • 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. 2 years typical at 25°C (77°F) with logging interval of 1 minute and Bluetooth Off Water Detect enabled in software.
  • Page 3 HOBO MX pH and Temperature Logger (MX2501) Manual • Change the orientation of your phone or tablet to ensure when the Bluetooth Off Water Detect power-saving mode is selected. the antenna in your device is pointed toward the logger. Obstacles between the antenna in the device and the pH Electrode: This is the electrode that is plugged into the logger may result in intermittent connections.
  • Page 4 HOBO MX pH and Temperature Logger (MX2501) Manual logger if the pH electrode has never been calibrated, the last 4. If the logger was previously configured with Bluetooth calibration is more than seven days old, or the logger firmware Always Off, press the switch on the logger to wake it up. If was updated.

  • Page 5: Configuring The Logger

    HOBO MX pH and Temperature Logger (MX2501) Manual  Make sure the sensor is in the correct buffer solution or 1. If the logger was previously configured with Bluetooth try rinsing the sensor and restarting the calibration. If Always Off, press the switch on the logger to wake it up. If...

  • Page 6: Setting Up Alarms

    HOBO MX pH and Temperature Logger (MX2501) Manual d. Tap Save. 5. Select Low if you want an alarm to trip when the sensor reading falls below the low alarm value. Drag the slider or 9. Tap Logging Mode. Select either fixed interval logging or type a value to set the low alarm value.
  • Page 7 HOBO MX pH and Temperature Logger (MX2501) Manual 85°F, the logger will switch to the faster logging rate and record point, or 9:22 in this case. If burst logging had not data every 30 seconds until the temperature falls back to 85°F.

  • Page 8: Setting A Password

    You can view events in exported files or rate for the normal logging interval. plot events in the app. 7. Tap Save. To plot events, tap HOBO Files and select a file to open. 8. Tap and then tap . Select the events you want to plot and tap OK.
  • Page 9 HOBO MX pH and Temperature Logger (MX2501) Manual  Alternatively, secure the logger to a pipe or similar Deploying and Mounting the Logger surface using cable ties wrapped around the two large grooves in the logger housing. Important: The pH sensor must be kept in storage solution when not being calibrated or deployed in water.
  • Page 10 HOBO MX pH and Temperature Logger (MX2501) Manual finger, spread a small dot of grease along both outer O- will feel the pH electrode pause as it passes through two rings. internal O-rings inside the sensor end cap (shown with step 3).

  • Page 11: Battery Information

    HOBO MX pH and Temperature Logger (MX2501) Manual b. Carefully screw the cap with storage solution onto the 3. Pull the mounting end cap and attached battery holder logger. straight out from the logger body without twisting. Insert a screwdriver through the mounting hole if you need additional leverage for removing the mounting end cap from the logger.
  • Page 12 The service related to human safety is not allowed because this device may have the possibility of the radio interference. © 2018–2020 Onset Computer Corporation. All rights reserved. Onset, HOBO, HOBOlink, and HOBOconnect are trademarks or registered trademarks of Onset Computer Corporation. App Store and iPadOS are service marks or registered trademarks of Apple Inc.

This manual is also suitable for:

Mx2501