guide_to_troubleshooting
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guide_to_troubleshooting [23/09/2019 07:02] pieter created |
guide_to_troubleshooting [23/09/2019 07:05] pieter [Guide to troubleshooting for pH/ORP/Ion] |
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| - | ====== Guide to troubleshooting ====== | + | ====== Guide to troubleshooting |
| + | When a measurement problem 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? | ||
guide_to_troubleshooting.txt · Last modified: 18/10/2019 07:54 by pieter
