Automatic Temperature Compensation Principle of pH Meter
Measuring principle: the meter uses a conductivity electrode sensor for measurement (the concentration electrode material is platinum), in order to avoid electrode polarization, the meter generates a high-stability sine wave signal and adds it to the electrode, the current flowing through the electrode is related to the concentration of the measured solution In direct proportion, the current flowing through the electrode is measured by the preamplifier and converted into a voltage signal, and the voltage signal reflecting the concentration value is obtained after program-controlled amplification, phase-sensitive detection and filtering; the microprocessor switches the temperature signal and the concentration signal Alternate sampling, after operation and temperature compensation operation, converted and displayed as the measured concentration value and real-time temperature value at 25°C.
The principle of automatic temperature compensation: the concentration of the measured solution is non-linearly proportional to its conductivity, and the conductivity of the solution changes due to the temperature, and temperature compensation is required. The temperature characteristics of various solutions are different, and it is carried out by a microprocessor. The relevant processing becomes fast and accurate, realizing the function of automatic temperature compensation.
The acid-base concentration meter adopts the principle of electromagnetic induction, which avoids the corrosion, pollution and polarization effects of strong corrosive solutions such as acids and alkalis on the electrodes, and can effectively monitor the regeneration effect of the ion exchanger to avoid calcium formation on the positive bed and silica gel on the negative bed accidents, ensure the safe and economical operation of ion exchangers, and are suitable for the detection of various strong electrolytes such as HCI, H2SO4, NaOH, and NaCl.
