ph_accuracy
Differences
This shows you the differences between two versions of the page.
| Both sides previous revision Previous revision Next revision | Previous revision | ||
|
ph_accuracy [27/02/2019 07:36] pieter [The pH buffers] |
ph_accuracy [13/03/2019 09:59] pieter [The pH meter] |
||
|---|---|---|---|
| Line 13: | Line 13: | ||
| * the measurement __linearity__ between and outside the calibration points. | * the measurement __linearity__ between and outside the calibration points. | ||
| - | As example, a pH meter with an accuracy given as (0.2%+1 digit) and a resolution of 0.01 pH. It depends on the reproducibility at the calibration points (± 0.01, 1 digit) and the linearity between and outside the calibration points (0.2%). When a calibration is done at pH 7.00 and pH 4.00, the device error at these same points is ±0.01 pH. For a measurement at 5.50 pH , the device error is (1.50 pH * 0.002) | + | As example, a pH meter with an accuracy given as (0.2%+1 digit) and a resolution of 0.01 pH. It depends on the reproducibility at the calibration points (± 0.01, 1 digit) and the linearity between and outside the calibration points (0.2%). When a calibration is done at pH 7.00 and pH 4.00, the device error at these same points is ±0.01 pH. For a measurement at 5.50 pH , the device error is ((1.50 * 0.002) |
| ==== The pH electrode ==== | ==== The pH electrode ==== | ||
| Line 31: | Line 31: | ||
| Check the accuracy of the pH buffers to know the possible measurement errors. Measuring between 2 buffers, used for the calibration, | Check the accuracy of the pH buffers to know the possible measurement errors. Measuring between 2 buffers, used for the calibration, | ||
| - | Also follow | + | ==== The user ==== |
| + | Follow | ||
ph_accuracy.txt · Last modified: 13/03/2019 09:59 by pieter
