The pH measurement is the most common requirement of today's laboratory which is engaged in soil analysis, water, and wastewater analysis, industrial water, environmental analysis, food processing, agrochemical manufacturing, electroplating, pharmaceutical manufacturing and in bulk drug manufacturing necessitate to check the pH at different level of processes in different aspects like quality control, process monitoring, pollution control and finalize the product etc. Generally, on the scale of 0 to 14 pH units, pH is measured, but with the growth of technology and increasing needs of different industries and study, the pH measurement range is increased from pH 2.0 to pH 20.00.
The measurement of the pH of every aqueous solution provides the degree of alkalinity or acidity of the solution. Generally, pH is defined as the logarithm of the hydrogen ion concentration. The pH electrode measures a solution potentiometrically as the pH electrode is deep in the solution, the electrical signal develops in the sensing membrane of the electrode. The output of the electrode fluctuates with the change in pH value with the linear relationship of 59.16 mV / pH unit value. Electrode slope varies in temperature, therefore the requirement of temperature compensation; this slope can be compensated automatically or manually with modern pH meter. For accurate pH measurement, automatic temperature compensation with the different sensor is required. pH calibrates auto with measurement buffers, detection with ATC to read the PH value at 25 degrees. It scans, stores, prints and preserves data as per the GLP concept.
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