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Chapter 2
Meter Basics
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22
Orion Star A320 Series Portable Meter User Manual
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pH Electrode Condition Icon
Orion Star A321 pH meters, Orion Star A324 pH/ISE meters, Orion Star A325 pH/conductivity
meters, Orion Star A326 pH/RDO/DO meters and Orion Star A329 pH/ISE/conductivity/RDO/DO
meters include a pH electrode condition icon. In the measurement mode, the pH electrode
condition icon indicates the performance of the pH electrode, based on the last saved
calibration and electrode measurement stability.
Icon
Electrode condition is good. The electrode slope is in the range of 95.1% to 104.9%.
Electrode condition is fair. The electrode slope is 85.1% to 95% or 105% to 114.9%.
Electrode condition is bad. The electrode slope is 85% or lower or 115% or higher. Consult the
pH electrode manual for instructions on how to clean, condition and troubleshoot the electrode.
Note: This is a general indicator of overall electrode status – always refer to the pH electrode
user manual for specific information on the recommended slope range for each pH electrode.
pH Electrode Status
Thermo Scientific
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