What are the technical characteristics of industrial acid-base concentration meters?
The acid-base concentration meter is a water quality online monitor with a microprocessor. The instrument is widely used in thermal power, chemical industry, steel pickling and other industries, such as the regeneration of ion exchange resin in power plants, chemical industry process, etc., to continuously detect and control the concentration of chemical acid or alkali in aqueous solution.
The working principle of the acid-base concentration 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.
Features:
1. The non-contact detection method fundamentally eliminates the corrosion, pollution and polarization effects of strong corrosive media on electrodes
2. Using variable frequency excitation power supply and resonant circuit and its unique signal sampling method to replace the single frequency excitation method, so that the detection transformer
3. The output voltage is increased several hundred times. The flow-through sensor adopts a low-temperature magnetic structure and ferromagnetic shielding, without zero drift phenomenon, which greatly improves the accuracy, sensitivity and stability of the instrument
4. Use the microcontroller (MCU) and interface integrated circuit to perform full digital sampling, calculation and display of the output voltage of the detection transformer and the output current of the temperature sensor, which can realize high-precision temperature compensation and local display and remote control of concentration values. transmit out.
