Shanghai Bilang's method to improve the level of acidity meter and the accuracy of testing instruments.
The level of the acidity meter and the accuracy of the instrument are two different concepts. The instrument level and its accuracy are not completely consistent.
The level of the acidity meter is expressed according to the division value (resolution or minimum display value) of its indicator (referred to as the electrometer), for example: an instrument with a division of 0.1pH is called a 0.1 instrument; the minimum display value is 0.001pH The instruments are called 0.001 grade instruments, etc. The accuracy of the instrument is the comprehensive error of the standard solution of the electric meter and the electrode. It is not only related to the electric meter, but also related to the glass electrode and the reference electrode.
Starting from the actual use requirements, the current division value of the electricity meter is 0.1 ~ 0.001pH. If necessary, according to the current technological level, it is possible to make a more precise electricity meter. However, due to structural and manufacturing reasons, the performance of commonly used electrodes is currently not yet fully ideal. The repeatability error of the glass electrode and the stability of the solution junction potential of the reference electrode are not better than 0.01pH.
Therefore, no matter how high the resolution of the electric meter is, the accuracy of the instrument test is difficult to be better than 0.01pH. However, choosing a high-resolution instrument can overcome or eliminate the influence of the meter on the test error to the greatest extent. Since it is no longer a problem to achieve satisfactory accuracy of the electric meter, it is constantly innovating and improving in terms of the instrument's intelligence, humanization, reliability, easy operation and cost performance. The “+†series instruments such as pHS-4C + produced by Chengdu Ark Technology Development Company exemplify this trend.
It should also be noted that why the detection of the total error of the instrument indication value should be specified in the range of pH3 ~ pH10? Because the junction potential of the reference electrode is related to the pH of the solution, the junction potential in the range of pH3 ~ pH10 Can be stabilized within ± 0.01pH range, if 10
BILON brand, dedicated service
Garden Pegs,Plastic Garden Nails,Plastic Nails For Garden,String And Pegs For Garden
Changzhou MD International Trade Co., Ltd. , https://www.mdgarden.com