ph_calibration_requirement
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ph_calibration_requirement [24/10/2018 07:02] pieter |
ph_calibration_requirement [24/10/2018 07:06] pieter |
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| * After measuring fluoride-containing solution and strong organic solution | * After measuring fluoride-containing solution and strong organic solution | ||
| * There is a big difference between the temperature of the test sample and the temperature of the buffer solution that is used in the last calibration. | * There is a big difference between the temperature of the test sample and the temperature of the buffer solution that is used in the last calibration. | ||
| - | |||
| - | === Simply check === | ||
| - | There is a simple way to quickly check if your pH meter needs a calibration at the moment. All you need to do is dip the pH probe into the calibration standard solutions such as pH 4.00 or pH 7.00, and see if the measurements have a big difference to the standard value. For most applications (if not for scientific research), if the difference is within 0.05 pH, for example the meter reads 6.97 in 7.00 solution or 4.03 in 4.00 solution, then it means the meter is in good condition and a calibration is not a must at the point. If the difference is over 0.05 pH, for example the meter reads 6.92 in 7.00 or 4.08 in 4.00, then a calibration is necessary and highly recommended before testing. | ||
| === Frequency === | === Frequency === | ||
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| * How the sensor is maintained by the operator between each measurement. | * How the sensor is maintained by the operator between each measurement. | ||
| * The customer experience in regard to samples and application. | * The customer experience in regard to samples and application. | ||
| + | |||
| + | === Simply check === | ||
| + | There is a simple way to quickly check if your pH meter needs a calibration at the moment. All you need to do is dip the pH probe into the calibration standard solutions such as pH 4.00 or pH 7.00, and see if the measurements have a big difference to the standard value. For most applications (if not for scientific research), if the difference is within 0.05 pH, for example the meter reads 6.97 in 7.00 solution or 4.03 in 4.00 solution, then it means the meter is in good condition and a calibration is not a must at the point. If the difference is over 0.05 pH, for example the meter reads 6.92 in 7.00 or 4.08 in 4.00, then a calibration is necessary and highly recommended before testing. | ||
| === General advice === | === General advice === | ||
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| * Prior to using the sensor, use a check standard. | * Prior to using the sensor, use a check standard. | ||
| - | * If the reading of the check standard is outside of the accuracy acceptance limits, then recalibrate | + | * If the reading of the check standard is outside of the accuracy acceptance limits, then re-calibrate |
| * If the calibration is outside of the acceptance limits, then clean/ | * If the calibration is outside of the acceptance limits, then clean/ | ||
ph_calibration_requirement.txt · Last modified: 24/10/2018 07:21 by pieter
