1. Instructions for use of ph controller
Acid-base (ph) adjustment is to stabilize the pH value of the process medium within the required range to meet the needs of the process, the ph control of the electroplating solution in the electroplating process, the ph control of the pulp in the metallurgical flotation process, and the process medium in the chemical process ph control of mother liquor, etc. In the water treatment process, the pH value of the water to be treated will greatly affect the use effect of various chemicals, and different types of wastewater may not be within the allowable pH range for discharge after various treatments.
ph controllers are widely used in water treatment in various industrial environments. In any aqueous solution, hydrogen ions and hydroxide ions have a certain fixed value, which is called the ion product constant of water. Adjusting the pH value is to achieve the ultimate goal of changing the water quality by adjusting the content of the two ions in the water. Application occasions of ph automatic adjustment dosing system: electroplating wastewater, pigment production, water treatment in printing and dyeing plants, cooling water, chemical process (reactor), etc.
The ph automatic adjustment dosing system automatically detects the ph value of the measured liquid through the ph controller, and converts it into a current signal by setting the control range and outputs it to the automatic dosing metering pump. The automatic dosing metering pump (set the receiving signal range and Output frequency range) Automatically adjust the dosing volume of the metering pump through the received signal.
2. PH automatic adjustment system equipment composition
The normal and stable operation of the pH automatic adjustment system depends mainly on the pH controller and the dosing pump. The selection of the dosing pump is very important according to the fluid medium, especially the pH automatic adjustment system often uses concentrated acid and alkali. It is very important to be able to accurately add the required dose when the key needs to be added. of.
1. Precision dosing metering pump:
The diaphragm type precisIon Metering pump is monitored by a microprocessor, safe and reliable, and has an exquisite structure. It can automatically adjust the dosage of the metering pump according to the feedback signal (mainly 4-20mA) detected by the pH analysis instrument, and add chemicals, acids or At the same time, it can automatically start and stop the pump according to the liquid level. Suggest American Milton Roy brand metering pump
2. PH analyzer:
The pH measurement and control unit demonstrates greater process stability in its wide range of applications, and has a variety of control characteristics (P, PI, PD, PID), which can accurately display the signal detected by the pH Detector and control Whether the precisIon Metering pump adds liquid medicine ensures that the pH value of the treated water is controlled at a constant set value. It can detect and display the pH value of water quality in real time, automatically compare it with the set value, and control the start and stop of the metering pump according to the feedback signal. The pH sensor can accurately measure the pH value of the treated water, and accurately input the detection signal value into the pH display control table.
3. Industrial pH meter electrode:
The pH sensor is refined by exquisite glass blowing technology, and this superb manufacturing process ensures the accuracy and reliability of its measurement. The glass used in the sensitive diaphragm of the pH Detector has the characteristics of small impedance, small deviation when the pH value is less than 1 and greater than 12, and the influence of temperature changes is small. It can accurately measure the pH value of the treated water, and accurately input the measured signal into the pH display control table.
4. Liquid level control.
It can detect whether the medicine in the chemical acid-base storage tank is exhausted, and send a signal alarm to notify the metering pump to stop working when the medicine liquid is insufficient.
5. Chemical dosing barrel storage tank:
The special medicine storage barrel for medicine dosing equipment has special installation positioning holes for precision medicine dosing metering pumps and other equipment on it, and the capacity varies from 100L to 5000L.
6. Automatic control system:
The self-control system is generally composed of PLC, frequency converter, touch screen and other components. According to the pH meter signal, the pH value can be stably controlled after PID operation.
3. System Features
One PH controller controls two metering pumps at the same time:
★Acid or alkali pump dosing selection: relay starts high-low PH value alarm signal
★Automatic adjustment of dosage: independent programming, on/off, proportional control of acid and alkali dosage
★Other controls: flow and liquid level switch output function
4. Precautions for PH automatic adjustment system
1. When the user selects the ph-adjusting dosing device, first determine the selection specifications according to the dosage required by the system: including metering pump flow, pressure, material, function and other parameters, the volume of the mixing tank and site conditions), and then according to the dosage , determine the dosing method (generally adopt the "one use and one standby" method)
2. Select the material of each part of the dosing device (PVC, PE, stainless steel SUS304, SS316, carbon steel), the type of metering pump (electromagnetic pump, mechanical pump, Diaphragm Pump) or provide our company with the parameters of the chemical ( name, concentration, temperature, density, viscosity, corrosiveness, etc.)
3. If there are other special requirements for the dosing device, it can be proposed separately.
