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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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Using a Three-Point pH Calibration versus a Two-Point pH Calibration

In order to guarantee the accuracy of your readings, it is necessary to bracket the expected pH values with at least two buffers.

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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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How to deploy a data logger in turbulent water

See image for a quick deployment idea for an underwater logger, such as the HOBO Water Temp Pro v2 or the HOBO U24 Conductivity logger.
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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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HOBO U20 Stainless Steel Data Logger - sensor location

See attached diagram for sensor location in HOBO U20 stainless steel data loggers.

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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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Proper Coupler Seating, BASE-U-4 (Optic Base station) and the U-DTW-1 (Waterproof Shuttle)

The attached image shows both the incorrect and correct assembly of a logger coupler to the BASE-U-4 (Optic Base station) and the U-DTW-1 (Waterproof Shuttle).

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Deploying water temp and water level loggers or developing a QAPP

For users looking for guidance on deploying temperature or water level loggers, or developing a QAPP (Quality Assurance Project Plan), here is a great reference from the EPA:

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