Ocean Optics pH Sensor Patches, Probes and Cuvettes - Manual (Page 33)

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Appendix B
Troubleshooting
Overview
The following are common sources of error.
Transmissive pH Probes
Problem Possible Cause/Suggested Solution
Bubbles If there are bubbles present in the optical path, the signal will be disrupted
and reported values will not be correct. Perform a visual check to ensure
there are no bubbles.
Saturation If the spectrometer is still saturating after SpectraSuite auto-adjusts the
integration time, you may be using a spectrometer with too large a slit. An
attenuator will fix the issue.
Colored or turbid analyte If there is sediment or color in the solution being measured, this will disrupt
the quality of reading. Reflective pH Patches should be used in these cases.
Reflective pH Patches
Problem Possible Cause/Suggested Solution
Improper wetting The mesh must be fully wetted for proper sensor performance.
Insufficient scan time Reflective pH patches typically have a much lower optical signal, and
therefore a complete spectrometer scan occurs much slower than the
transmissive form factors. A scan may take up to 2 seconds to complete, and
improper references and readings will be made if the user takes an
acquisition before the electronics have sufficiently caught-up.