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Can the HOBO MX2501 pH Logger be Used with the Total Hydrogen Scale (pHT)?

The Total Hydrogen Scale (pHT) requires custom buffers that are designed to mimic the activity of hydrogen ions in seawater.

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HOBO MX1101 & InTemp CX400 - Audible Alarm Sound Levels

The audible alarm outputs a tone measured at 75db with fresh batteries, and 65db with very low batteries.

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An alarm was tripped on my MX logger. How do I clear it?

Visual alarms are cleared based on the settings selected under “Maintain Visual Alarms Until” when configuring the logger.

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MX logger is listed in the wrong group. How can I change that?

  • Connect to the logger, tap Configure, and then tap Group.
  • Select a group for the logger or create a new group.
  • If you do not want the logger to be listed in any group, th
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Calibrating for pH at Temperatures Other than 25°C

The observed pH of the buffers (and samples) varies depending on temperature.

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Logging RH without Temp

The Bluetooth-enabled HOBO MX1101 and HOBO MX1102 loggers both use a Relative Humidity sensor that returns a temperature-compensated RH measurement.

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UX Logger Firmware Update Troubleshooting

If you are having trouble updating the firmware on your UX logger, try these steps:

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Why Do I Always Have to Calibrate in pH 7.00 and Then at Least One Other Buffer?

pH is considered an inferred value. This means that raw data (in this case potential as mV and temperature) are used to calculate pH with a known algorithm called the Nernst Equation.

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