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guide_to_troubleshooting [23/09/2019 07:04] pieter |
guide_to_troubleshooting [18/10/2019 07:54] (current) pieter |
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====== Guide to troubleshooting for pH/ORP/Ion ====== | ====== Guide to troubleshooting for pH/ORP/Ion ====== | ||
- | When an error arises, it is best to try to locate the cause first. Here's a list of all possible reasons that might cause measurement issues: | + | When a measurement problem |
- | ===== READINGS ARE NOT REPRODUCIBLE | + | ===== Readings are not reproducible |
* Is there sample carryover? | * Is there sample carryover? | ||
* Are there sample interferences or complexing agents present? | * Are there sample interferences or complexing agents present? | ||
* Is the reference electrode junction contaminated? | * Is the reference electrode junction contaminated? | ||
- | ===== SLOW RESPONSE | + | ===== Slow response |
* Was the electrode stored in the wrong solution? | * Was the electrode stored in the wrong solution? | ||
* Was the electrode poisoned by the sample? | * Was the electrode poisoned by the sample? | ||
- | ===== OUT OF RANGE READING | + | ===== Out of range ===== |
* Is the electrode plugged into the controller properly? | * Is the electrode plugged into the controller properly? | ||
* Is there a reference electrode present? | * Is there a reference electrode present? | ||
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* Is the electrode placed in the sample solution? | * Is the electrode placed in the sample solution? | ||
- | ===== LOW SLOPE OR NO SLOPE ===== | + | ===== Low slope or no slope ===== |
* Are the standards too old, contaminated, | * Are the standards too old, contaminated, | ||
* Has the sample pH been adjusted properly to the operating range of the electrode? | * Has the sample pH been adjusted properly to the operating range of the electrode? | ||
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* Is there enough fill solution left in the reference electrode? | * Is there enough fill solution left in the reference electrode? | ||
- | ===== NOISY RESPONSE | + | ===== Noisy response |
* Is the controller grounded? | * Is the controller grounded? | ||
* Is there an air bubble on electrode surface? | * Is there an air bubble on electrode surface? | ||
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* Is there enough fill solution left in the reference electrode? | * Is there enough fill solution left in the reference electrode? | ||
- | ===== DRIFTY RESPONSE | + | ===== Drifty response |
* Is there excessive leaking at the reference electrode junction? | * Is there excessive leaking at the reference electrode junction? | ||
* Is the reference electrode junction clogged? | * Is the reference electrode junction clogged? | ||
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* Does the sensing membrane need conditioning? | * Does the sensing membrane need conditioning? | ||
- | ===== INACCURATE READINGS | + | ===== Inaccurate readings |
* Are the standards incorrect? | * Are the standards incorrect? | ||
* Was the sample pH adjusted properly? | * Was the sample pH adjusted properly? |