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Xinxiang Juxinglong Water Treatment Co.,Ltd. Contact：Mr. Xu Mobile：13653905177 Tel：0373-5651158、0373-5651855 Fax：0373-5651866、0373-5762666 Addrerss：Hongqi District, Dong Guan township government breakwater 500 meters,Xinxiang City, Henan Province
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Operation manual of automatic dosing control device
Operation manual of automatic dosing control device
1. Features of dosing device:
----The frequency conversion automatic dosing control device adopts the imported high-tech product - AC frequency converter to form an advanced AC speed regulation system to realize the best automatic control of dosing. The biggest advantages of the system are reliable performance, long service life, good starting characteristics and low energy consumption. The device can also be used as the speed control system of AC motors such as water pump, oil pump and fan to control the pressure and flow of liquid and steam in the infusion pipeline.
2. Structure of dosing device
----The automatic control device is mainly composed of automatic control cabinet, recorder, AC motor, dosing pump, etc. There are frequency converters, regulators, detectors, etc. in the automatic control cabinet, as shown in the table below. The selection of the detector is determined by the user's dosing type. For example, for ammonia dosing, conductivity meter or pH meter can be selected for the detector, rapid phosphate analyzer can be selected for phosphonate dosing, pH meter can be selected for neutralization tank, R meter is required for coordinated phosphate treatment, flow current meter is used for coagulation, residual chlorine meter is required for chlorination, etc.
3. Principle of dosing device
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----It can be seen from the figure that the dosing pump motor is driven by the AC frequency converter to inject the reagent into the liquid, and the drug concentration is detected by the detector. The detector inputs the electrical signal proportional to the concentration into the regulator and compares it with the set value to obtain the deviation signal. The regulator performs proportional and integral calculation on the deviation signal according to the process requirements, and the calculation result signal is transmitted to the frequency converter, The frequency converter changes the frequency of the motor working power supply according to the regulation signal output by the regulator, changes the motor speed, changes the concentration of traditional Chinese medicine liquid injected into the liquid, and controls the drug concentration within the optimal range.
4. Technical parameters of automatic dosing equipment
4.1 output signal of detector: 0 ~ Loma, 4 ~ 20mA, DC.
4.2 regulator
Input signal: 0 ~ 10mA, 4 ~ 20mA, DC.
Output signal: 0 ~ 10mA, 0 ~ 10V, 4 ~ 20mA.
Control accuracy: ± 5%.
PI function: used for fast adjustment process.
Intelligent adjustment function: for fast or large lag adjustment process.
4.3 frequency converter
Rated power of frequency converter ≥ 1.6 times of working motor power
Frequency range of frequency converter driven motor: 5 ~ 100Hz (4-pole motor).
4.4 control cabinet
Power supply: three-phase 380 ± 10% v and single-phase 220 ± 10% v,
Power frequency: 50 or 60Hz
Power supply power: related to the working motor power.
4.5 working environment conditions
Temperature < 40 ℃
Relative humidity ≤ 85%
Vibration frequency ≤ 25Hz
The fully automatic dosing equipment integrates the dosing tank, metering pump (diaphragm pump) and automatic control system, that is, it is installed on a base, connects the outlet of the metering pump (column plug pump) with the dosing pipeline, the inlet and outlet of the metering tank with the water inlet pipe, and sends the power supply and detector signal of the control cabinet to the control cabinet to start and put into operation. Automatic dosing equipment is widely used in electric power, petroleum, chemical industry, metallurgical industry, environmental engineering, water treatment and other fields. In order to achieve the best effect, under the condition of changing working conditions, the dosage of added chemicals is automatically tracked and adjusted to control the dosing speed. Therefore, in this dosing device, we adopt advanced automatic control mode to control the dosage. Except for some dosing pipelines, sampling pipelines and dosing concentration detection instruments, these dosing equipment are generally installed in one dosing room. Our company completes the purchase, manufacturing, assembly, commissioning and commissioning of dosing equipment. Users only need to place the combined automatic dosing device behind the dosing room. In this way, the on-site construction workload can be greatly reduced, the errors caused by various intermediate links and mutual wrangling can be avoided, the construction period and project quality can be effectively guaranteed, and the trouble and loss of users can be reduced.
2、 Components of automatic dosing equipment
----It mainly includes single pump, double pump and single control combined type, three pump and double control combined type, combined boiler water R-value automatic control device and other types. The structure of each type is somewhat different, which is described below.
1. Double pump single control combined automatic dosing device this device is composed of a metering box, two metering pumps (standby for each other), a set of AC frequency conversion automatic dosing control system, connecting pipeline, valve, base, etc., as shown in Figure 1. The volume of the measuring tank is 1m '(otherwise discussed if the user has special requirements). Whether it is equipped with agitator, remote liquid level gauge, liquid level high and low limit alarm and tank material selection are proposed by the user or the design department, or the user can directly consult our company. The tank body is made of steel, stainless steel and rubber lined tank, which is used for different liquid medicine. When ordering, the user must specify the following parameters of the metering pump: flow (1 / h), pump outlet pressure (MPA), pump flow path material (or name and concentration of conveying agent).
