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Level precision pH meter

2016-04-19 15:43:46

    Accuracy acidity levels and instruments are two different concepts, equipment level and its accuracy is not entirely consistent. Its acidity level is an indicator (the electric meter) scale value (minimum display resolution or value) represents, for example: indexing of 0.1pH instrument instrument called a 0.1; minimum display value 0.001pH the instrument is called 0.001 instruments, and so on. The accuracy of the instrument is the electric meter with integrated error test electrode supporting standard solution, it is not only with the electric meter, but also to be more related to the glass electrode and reference electrode. Starting from the actual use requirements, dividing the electricity meter is 0.1 ~ 0.001pH, if necessary, according to the current level of technology, can produce more sophisticated electric meter. However, due to the structure and other aspects of manufacturing, often with the electrode performance can not reach the desired level entirely. Repeatability error of the glass electrode and the reference electrode junction potential stability of the solution is not better than 0.01pH. Therefore, no matter how high the resolution of electricity meter, test instrument Accuracy immune than 0.01pH. However, choosing a high-resolution instrument can maximize the impact of electrical meter to overcome or eliminate the test error. To achieve satisfactory since the electricity meter accuracy is not a problem, so all the instrument's intelligent, humane, reliable, easy to operate and cost and other aspects of innovation and improvement. Relationship between the level of acidity test its accuracy specified in the acidity of national verification procedures (JJG119-84) as follows:
    
Dividing the value or the minimum display value (pH) 0.20.10.020.010.001
    
PH pH meter instrument level 0.2 0.1 0.02 0.01 0.001
    
Supporting test shows the total error value (pH) ± 0.2 ± 0.1 ± 0.02 ± 0.02 ± 0.01
    
Electricity meter indication error (pH) ± 0.1 ± 0.05 ± 0.01 ± 0.01 ± 0.002
    
Note: The test range matching test should be controlled within pH3 ~ pH10.
    
As can be seen from the table below for a 0.01 pH meter, showing the value of the total error value is equal to its level of acidity to 0.01, showing the value of the total error is 0.02pH, for 0.001 pH meter, which shows the value of the total error We can only achieve ± 0.01pH, but this case requires the use of a pH standard materials can be guaranteed. (Note: pH national standard points and two two kinds of a generally conventional pH meter is the second pH standard material.)

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