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Hobo MX series Manual

Ph and temperature data logger
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HOBO® MX pH and Temperature Logger (MX2501) Manual
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176 - TestEquipmentDepot.com
HOBO MX pH and
Temperature Logger
MX2501
Included Items:
• pH electrode in storage
solution
• Electrode storage solution
bottle and cap
• Anti-biofouling copper
guard
• Silicone-based O-ring
grease and foam swab
Required Items:
• HOBOmobile app
• Device with iOS and
Bluetooth
• 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 beaker
(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)
22511-B
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
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 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
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
Battery Life
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
-2° to 50°C (28.4° to 122°F)
±0.2°C (±0.36°F)
0.04°C (0.072°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
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.
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.
in mV
-512 to 512 mV
±0.20 mV
0.02 mV

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  • Page 1 Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176 - TestEquipmentDepot.com 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.
  • Page 2 HOBO MX2501 MX pH and Temperature Logger Manual Specifications (continued) pH Electrode Life 6 months 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)
  • Page 3 HOBO MX pH and Temperature Logger (MX2501) Manual Button Push” or with a delayed start. The blue LED blinks every 2. If this is the first time you’re installing a pH electrode, skip 4 seconds when an alarm is tripped (unless the Show LED to step 3.
  • Page 4 HOBO MX pH and Temperature Logger (MX2501) Manual the storage solution cap installed on the logger onto the device. This forces the previous Bluetooth connection to bottle as shown below. close. Once connected to the logger you can select one of the following actions: •...

  • Page 5: Calibrating The Logger

    HOBO MX pH and Temperature Logger (MX2501) Manual 9. Place the sensor end of the logger in either the pH 4.01 or Calibrating the Logger 10.00 solution as prompted, making sure the sensor end The logger needs to be calibrated using 7.00, 4.01 and/or 10.00 cap, temperature sensor, and closure cap are submerged in buffers to record accurate pH readings.

  • Page 6: Configuring The Logger

    HOBO MX pH and Temperature Logger (MX2501) Manual at different temperatures. HOBOmobile will automatically 6. Tap Logging Interval and choose how frequently the logger compensate for temperature variances from 25°C (77°F) will record data unless operating in burst logging mode (see based on the actual temperature-dependent pH value Burst Logging).

  • Page 7: Setting Up Alarms

    HOBO MX pH and Temperature Logger (MX2501) Manual choosing statistics options). In burst mode, logging occurs at 5. Enable the Low Alarm if you want an alarm to trip when the a different interval when a specified condition is met. See sensor reading falls below the low alarm value.

  • Page 8: Burst Logging

    HOBO MX pH and Temperature Logger (MX2501) Manual Limits in step 9. Otherwise, the alarm state will remain in place 6. Enable Low Limit if you want burst logging to occur when until the logger is reconfigured. the sensor reading falls below a specific reading. Drag the...

  • Page 9: Setting A Password

    HOBO MX pH and Temperature Logger (MX2501) Manual burst logging began at 9:06. Burst logging then continued 5. Select the statistics you want the logger to record at each until 9:12 when the sensor reading fell back below the logging interval: Maximum, Minimum, Average, and high limit.
  • Page 10 HOBO MX pH and Temperature Logger (MX2501) Manual the switch on the logger for 1 second to wake it up. If the Internal Event Name Definition logger was configured with Bluetooth Off Water Detect and performed a safe shutdown with all data it is deployed in water, remove it from the water.

  • Page 11: Battery Information

    HOBO MX pH and Temperature Logger (MX2501) Manual are not guaranteed due to uncertainties in initial battery Maintaining the Logger conditions and operating environment. • The pH sensor must be kept in storage solution when To install or replace the battery: not being calibrated or deployed in water.
  • Page 12 HOBO MX pH and Temperature Logger (MX2501) Manual 8. Reinstall the battery holder and attached mounting end cap. Use the alignment tab on the battery holder (shown in step 4) and the arrow on the logger housing as a guide as you fit the small tab in the mounting end cap into the small groove on the logger housing.
  • Page 13 HOBO MX pH and Temperature Logger (MX2501) Manual Federal Communication Commission Interference Statement This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation.

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Mx2501

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