The flow quantitative control system cooperates with various flow sensors and transmitters to realize quantitative filling and batching control. The main technical features are applicable to the current and pulse output flow sensor 3- point switch input for start-up, recovery, and 3- point control output for each accumulated value . It is used for large valve, small valve grading control and instantaneous flow lower limit alarm. The transmission output can output the instantaneous flow value as standard current and voltage for use by other devices.
The flow quantitative control system mainly responds to the pulse flow signal of the flow quantitative control according to the flow meter . When the flow cumulative flow reaches the set value ( quantitative value ) , the quantitative control device will give the electromagnetic valve or pump a switching signal, which has reached the valve, Pump start and stop control. Automatic and manual control of the feed is achieved.
   At present, many companies use or need to improve one of the projects, especially some companies that still use manual operation of canning / feeding, and do not want to invest too much cost, the company that wants to improve work efficiency is recommended. The system is highly accurate, easy to operate and can be calibrated on site.
First, the system consists of Â
1, quantitative flow control: This is the basis of the control, directly affects the control effect, so the basic requirement is the higher the better measurement accuracy, the signal output. At the same time, there are many types of flowmeters, and it is necessary to select the appropriate flowmeter according to the parameters such as measuring medium, pipe diameter and flow range.
2, quantitative flow control: temperature field may be measured medium, the error is automatically compensated by quantitative controller according to temperature change (optional)
3 , flow quantitative control : quantitative control parameter setting, media flow display, integrated calculation, operation, etc.
3 , control box: internal control lines and components, external control buttons and indicators. ( optional )
4 , cut-off equipment: can be the existing power equipment of the pipeline, such as pumps; it can also be installed behind the solenoid valve.
Second, the control process
   After receiving the flow signal of the flowmeter, the quantitative controller completes the flow accumulation inside, and sets the required quantitative control value inside the controller. When the cumulative value displayed by the quantitative controller reaches the set quantitative value When the value is controlled, the quantitative controller outputs a switching signal. At this time, the switching signal is used to control the current interrupting device installed on the pipeline through the matching relay or the contactor, thereby achieving the effect of quantitative control.
Third, product features
1. The control circuit and components in the control box are customized according to the flowmeter and equipment required by the customer. The signal line connection is simple, and generally no adjustment is needed after the scene;
2 , the control box panel has " start " , " stop " and other buttons, and has a " status indicator " display, so the display is intuitive, easy to operate, easy to learn;
3. Each quantitative control value can be arbitrarily changed as needed, and only needs to be completed in the quantitative controller;
4. The display parameters of the quantitative controller include the current accumulation, total accumulation, instantaneous flow, time, flow meter input signal value, etc.
5 , with large and small valve control, respectively control large flow and small flow, to achieve accurate quantitative control;
6 , with a material query function, you can query the total number of materials, each time of feeding, each amount of material.
Application characteristics and principle of flow quantitative controller
First, use and characteristics
The flow quantitative controller is a new type of flow measurement control instrument developed by advanced single-chip microcomputer technology. The flow quantitative controller has the advantages of small size, light weight, simple operation, intuitive display reading, clear and high reliability, and is matched with the flow sensor of the pulse output such as turbine and vortex street and the electric wq magnetic valve to form a flow control system, which is suitable for petroleum. Quantitative control of flow in industries such as chemical, pharmaceutical and food. Â The flow quantitative controller has an 8 -bit digital tube and a 51- line light column to display the progress of the current batch in real time, which is straightforward.
The flow quantitative controller has a good man-machine interface, and it is convenient and simple to modify the set value and control operation.
Flow quantitative control of relays with built-in large-capacity contacts, and power-off protection devices for high reliability and long life.
Second, the working principle
Calculation formula for flow sensor based on pulse output
Q=N/K
Wherein Q ---- cumulative flow (units Rise)
N ---- flow signal pulse number (times)
K ---- meter constant (times / liter)
The meter constant is placed in the controller, and the controller automatically calculates the corresponding pulse number according to the set value. When the flow rate controller starts, the built-in relay state is changed, so that the control valve is opened, and the controller performs the signal from the flow sensor. Counting, when the set amount is reached, the original state of the relay is restored, and the control valve will be closed, thereby achieving quantitative control of the flow in the pipeline.
Third, technical parameters
1 measuring medium   Determined by the flow sensor
2 input signal 1-400HZ , square wave low level < 1.5V high level > 4.5V
3 quantitative range 0.1-99999999 liters
4 can be placed into the meter constant maximum 999999 times / liter
5 provides 12DV , 50mA power supply for the sensor
6 environmental conditions 0-45 °C  Relative humidity less than 85 %
7 power supply 220V ( 187-242 ) AC 50HZ
8 8 -bit LED shows cumulative total value Light column shows batch progress
9 power-off protection for cumulative total, instrument constant and previous quantitative value, protection time is more than 10 years
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