Circulation-type automatic-cleaning pH measurement control device and method

Abstract

The invention discloses a circulation-type automatic-cleaning pH measurement control device and method. The device comprises a pH value measurement washer, a signal matcher and a main control computer. The output end of a pH electrode is connected with the main control computer through the signal matcher; and an ultrasonic electrical signal of the main control computer is input to an ultrasonic transducer through a cable. The method comprises a cleaning step: an embedded computer periodically controls an ultrasonic signal generator to start so as to carry out cleaning on the pH electrode or controls the ultrasonic signal generator to start to carry out cleaning on the pH electrode based on voltage signals sent by the pH electrode. The problems of measurement data interruption in the cleaning process, no PID control function, unsatisfactory cleaning effect by adopting an air static pressure method, complex structure and many faults by adopting the cleaning method of a brush cooperating with cleaning fluid, damage to detected solution due to the need of adding chemical cleaning fluid in the cleaning process, and damage to the electrode due to exposure of the electrode in the air easily caused by cutoff of the detected solution and the like are solved.

Description

technical field [0001] The invention relates to a pH measurement and control device and method, more specifically a device and method for measuring and controlling the pH value in a solution and automatically cleaning a pH electrode. Background technique [0002] The flow-through pH measurement and control cleaning instrument is used in the non-ferrous metal hydrometallurgical process to measure the pH of the liquid in the pipeline. At present, the existing flow-through pH meters that can automatically clean the electrodes are cleaned by compressed air blowing, mechanical brush cleaning and chemical reagent cleaning. When cleaning with compressed air, the actuator will pull out the pH meter and compress The air passes through the cleaning nozzle and blows away the sensitive bulb of the glass electrode to achieve cleaning. This method has a certain effect on cleaning liquids such as scale, but for the dirt formed by metal salt crystals and ore pulp in the hydrometallurgical p...

AI Technical Summary

Problems solved by technology

At present, the existing flow-through pH meters that can automatically clean the electrodes are cleaned by compressed air blowing, mechanical brush cleaning and chemical reagent cleaning. When cleaning with compressed air, the actuator will pull out the pH meter and compress The air passes through the cleaning nozzle and blows away the sensitive bulb of the glass electrode to achieve cleaning. This method has a certain effect on cleaning liquids such as scale, but for the dirt formed by metal salt crystals and ore pulp in the hydrometallurgical process, The cleaning effect is not good. The second cleaning method uses mechanical brushes and chemical reagents to clean. When cleaning, use the actuator to pull out the motor, spray chemical reagents from the nozzle, and use mechanical brushes to clean the sensitive bulbs of the glass motor. Although this method can realize the cleaning of the electrode and the cleaning effect is relatively good, the mechanical structure of this method is complex, the failure rate, the measurement data interruption during the cleaning process, and the chemical cleaning solution destroys the components of the measured medium, resulting in a decline in product quality and a large amount of cleaning. In addition, the visible automatic cleaning pH meter can only measure and does not have automatic control. Automatic control needs to be realized, and the measurement signal needs to be sent to the regulating instrument and control system to realize automatic control.

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