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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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Custom pH Buffers to Calibrate the HOBO MX2501 pH Logger

The HOBO MX2501 pH logger calibration procedure is only designed to work with National Bureau of Standards (NBS) pH buffers 4.01, 7.00, and 10.00.

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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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Required Tools for Weather Station Setup

Required tools for weather station setup:

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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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Wiring Multiple 4-20mA Loops with a Single Power Supply

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How to configure differential pressure for bidirectional scaling

Set the PXU sensor to Bidirectional mode by moving the jumper to BI, as described in the attached manual.

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Water Level Quick Test

Please see attached document

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Barometric Compensation Method

Barometric Compensation Method - Technical Details

This section presents the details of how the Pressure values are computed, and how Pressure and Temperature values

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Pendant Optics

Attached please find an image that shows the location of optic LEDs in Pendant (UA-series) loggers. All Pendant optics are located in the same location on all models.

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