Liquid mass flow metering control system is composed of secondary instruments (flow metering controller, PLC, touch screen, computer, electrical switch), and primary system includes (flow transmitter, liquid delivery pump, automatic valve, temperature transmitter). The metering control accuracy can reach within 0.2%.

1. System composition and principle

1. Core components

- Flow meter: measures liquid flow, commonly used turbine, electromagnetic flow meter, etc., the accuracy directly affects the control effect (need to be selected according to the properties of the medium and the pipe diameter).

- Controller: built-in intelligent algorithm (such as PID control), realizes quantitative setting, real-time monitoring and automatic start and stop, supports touch screen operation and remote communication (RS485/Internet of Things).

- Flow cut-off device: solenoid valve or electric valve (solenoid valve is preferred, which responds faster), combined with pump control to achieve precise flow cut-off.

- Typical configuration: flow meter → controller → solenoid valve/pump.

2. Working principle

The real-time flow data is fed back to the controller through the flow meter. When the accumulated flow reaches the preset value, the controller outputs a signal to close the valve or stop the pump. The error range is usually ≤±0.5% (normal temperature conditions).

2. Technical parameters

3. Application scenarios

Industrial filling: precise filling of oral liquid (error ≤ 0.5g), quantitative packaging of lubricating oil.

Food production: seasoning ratio, dairy bacteria addition (±0.1ml), baking filling.

Chemical metering: corrosive liquid ingredients, methanol quantitative control.

4. Selection and optimization suggestions

1. Flowmeter selection: electromagnetic flowmeter for acidic/high temperature media, volumetric flowmeter for viscous liquid.

2. Valve configuration: solenoid valve is better than electric valve (fast response), "large and small valve combination" control (coarse adjustment + fine adjustment) is recommended for large flow scenarios.

3. Function expansion:

Support multi-channel control (such as managing 4 production lines at the same time).

Bluetooth/mobile phone remote control,data traceability.