How to control the automatic dosing of coagulant with streaming current meter?
Release time:2025.11.24
The streaming current meter is an instrument for online monitoring of the coagulation effect of adding alum, which is used to automatically adjust and control the addition of coagulants.
It mainly consists of two parts: a sensor and a controller.
The specific working method is as follows:
The piston of the streaming current meter sensor reciprocates up and down in the annular electrode. When the water sample with added coagulant passes through the streaming current meter sensor, the water in the annular space of the electrode also moves accordingly, the double electric layer of the colloidal particles is disturbed, and the water flow carries the counterions in the colloidal diffusion layer to move together, thus forming a streaming current. This streaming current is collected by the electrodes at both ends, amplified by the signal amplifier, and rectified into a DC signal output. When the concentration of colloidal particles in the water changes, the detection value collected by the streaming current meter will also change accordingly. In this way, real-time and reliable data basis can be provided for the coagulation effect of raw water.
After the streaming current meter controller reads the streaming current value detected by the sensor, it will convert the streaming current value and display the detection value intuitively. The controller is equipped with PID control function. After comparing and calculating the flowing current value with the set reference value, the controller will output a 4-10 mA signal for adjusting the opening of the metering pump or the dosing pump. The SCV response value of the raw water is detected by the flowing current meter to determine the amount of coagulant to be added, thereby reducing the consumption of chemicals and reducing costs on the basis of ensuring and improving water quality, thereby improving the economic and social benefits of the enterprise. At present, Bebur flowing current meters have been widely used in water plants and have achieved good results, effectively helping water plants achieve the goal of reducing costs and increasing efficiency.
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