Automatic Temperature Compensation (ATC). Let’s delve into what this means:

1. What does pH ATC do?

   • ATC enhances accuracy and ensures that the pH electrode remains calibrated regardless of temperature fluctuations.
   • During calibration, ATC reads the true temperature of the buffer solution and assigns the exact correct value.
   • During testing, ATC reads the true temperature of the sample and adjusts the slope to maintain accurate pH measurements.

2. Should I bother to use ATC for pH?

   • Yes, it’s generally worthwhile to use ATC for pH measurements.
   • ATC improves accuracy and reduces the need for strict temperature control of samples or buffers.
   • Without ATC, errors can occur due to temperature differences between buffers and samples.

3. Will ATC adjust the measured sample pH result to the result expected at 25°C?

   • No, ATC doesn’t work like conductivity temperature compensation.
   • We cannot directly adjust a measured sample pH value at one temperature to an expected value at another temperature.
   • pH values can change rapidly due to various factors, so pH is often reported alongside temperature measurements.

4. Do I need an ATC probe for temperature-compensated pH measurements?

   • No, an ATC probe is not required.
   • Using a Thermo ScientificTM OrionTM TriodeTM pH/ATC combination electrode or LogRTM technology meter provides automatic temperature-compensated pH measurements.