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guide_to_troubleshooting [23/09/2019 07:02] pieter created |
guide_to_troubleshooting [23/09/2019 07:04] pieter |
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- | ====== Guide to troubleshooting ====== | + | ====== Guide to troubleshooting |
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 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: | ||
- | 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 (READINGS SLOWLY CHANGING) | + | ===== SLOW RESPONSE (READINGS SLOWLY CHANGING) ===== |
* 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 READING |
* 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 (READINGS RANDOMLY CHANGING) | + | ===== NOISY RESPONSE (READINGS RANDOMLY CHANGING) |
* 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 (READINGS CONTINUOUSLY CHANGING) | + | ===== DRIFTY RESPONSE (READINGS CONTINUOUSLY CHANGING) |
* 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 (BUT CALIBRATION IS OK) | + | ===== INACCURATE READINGS (BUT CALIBRATION IS OK) ===== |
* Are the standards incorrect? | * Are the standards incorrect? | ||
* Was the sample pH adjusted properly? | * Was the sample pH adjusted properly? |