This involves interactions between a business and its customers. It's about meeting customers' needs and resolving their problems. Effective customer service is crucial.
This involves interactions between a business and its customers. It's about meeting customers' needs and resolving their problems. Effective customer service is crucial.
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
| Parameters | Index Description |
| Control accuracy | Normal temperature medium: 0.2%, high temperature medium (≤160℃): 0.5% |
| Measuring range | 0.001L-99999999L (customizable) |
| Medium adaptability | Water, oil, corrosive liquid, steam, etc. |
| Temperature range | Medium: -20℃～160℃; Environment: -20℃～60℃ |
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.
| Power Supply | AC220V/50HZ or DC12-24V 5W |
| Screen | 3.5 " LCD (480*320 pi) |
| Input Function | Frequency signal: Fr( range: 0.0-5000.0HZ, Vil: ≤1V, Vih:≥10V Analog signal: 4-20mA Flow serial port signal: 9,600 b i t s / s |
| Output Function | Relay output: Support up to 3 relay output, contact capacity 5A@ 220VAC / 5A@ 30VDC, can be configured upperlimit HH / upperlimit HI/ lowerlimit LO / lower limit LL |
| Interaction mode | Select 0-6 gear for 7 gear modes 4 switching value feedback start / pause, stop, reset and print |
| External power | One DC24V 0.2A, one DC24V 1A |
| Display mode | 3.5-inch Industrial Display screen (Fine Black and White), Chinese character display |
| Key structure | 16 setting keys and 5 function keys |
| Precision | Accuracy detection accuracy is related to the selected instrument The flowmeter with pulse signal output has no acquisition error Sampling error of flowmeter for analog signal output <0.1% The flowmeter with serial port signal output has no acquisition error Valve control quantitative accuracy 0.2% |
| Set quantity | 7 quantitative modes, fast switching of various batch, quantitative value and advance working modes |
| Error Precision | ±2 seconds / day |
| Communication Function | One way bill printing interface (optional) One channel RS485 communication supports Modbus RTU protocol |
| Working Environment | Working temperature:-2 0 ℃ 70 ℃ (avoid directsunlight) Relative humidity: 0 / 90%R.H (without condensation） |
| Size | Overall dimension: 164*102*75.5 Installation dimension: 156*92 |
