Application of Ultrasonic Cleaning Function on PH Meter Electrode
While industrial online pH meter electrodes are widely used in the industrial field, due to different measurement media, the degree of contamination is also different, so the cleaning method used by the online pH meter electrodes is also different.
At present, most of the pH meter electrodes use glass electrodes as measuring electrodes and calomel electrodes as reference electrodes.
When the pH meter detects the medium, contaminants will adhere to the glass electrode, which will affect the potential generated by the glass electrode, which will affect the pH meter's display value, reduce sensitivity and measurement accuracy, and even fail. Therefore, the anti-pollution and cleaning methods of the pH meter in actual use have been continuously studied.
Commonly used cleaning methods for pH meters include mechanical brushing, ultrasonic cleaning, water jet cleaning, chemical solution jet cleaning and composite cleaning. The simplest cleaning convenience is manual cleaning, but manual cleaning has many disadvantages, such as troublesome electrode disassembly, easy damage to the electrode, and temporary suspension of measurement operations. However, when using ultrasonic cleaning, there are certain conveniences.
Ultrasonic cleaning is equipped with an ultrasonic cleaning head under the pH electrode. The ultrasonic generator provides an oscillation source with a frequency of about 80 kHz to the cleaning head, so that the cleaning head generates high-frequency vibration, and the high-frequency vibration of the cleaning head is transmitted to the solution to be tested. An air gap is generated in the solution and then disappears quickly. The cavitation effect of repeated generation and disappearance of the air gap can make the scaling of sensitive parts of the electrode peel off or prevent the adhesion of contaminants.
It is better to use ultrasonic cleaning in urban sewage and industrial sewage online monitoring instruments. It has been reported that the use of a pH sensor with ultrasonic cleaning function can ensure the detection accuracy under long-term operating conditions. The traditional ultrasonic cleaning machine uses an oscillator to generate ultrasonic waves. The disadvantage is that when the load (transducer) is replaced, the oscillation circuit must be redesigned, and the traditional ultrasonic instrument uses a tube, which works in the linear region, and Non-switching state, so the loss is large and the operating frequency is not high. The ultrasonic power supply of the ultrasonic cleaning device uses a new generation of power electronic devices. It works in the switching state, with low loss and high operating frequency, which can reach the megahertz level. When the load is different, the circuit can automatically track the load resonance frequency without redesigning the circuit An ultrasonic power supply with an operating frequency of up to 20kHz ~ 1MHz has a strong practicality.
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