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The flow quantitative control system is designed to work with various flow sensors and transmitters, enabling precise filling and batching operations. Its main technical features include compatibility with current and pulse output flow sensors, 3-point switch input for start-up and recovery, and 3-point control outputs for each accumulated value. It supports large and small valve grading control, as well as instantaneous flow lower limit alarms. The system can also output the instantaneous flow value in standard current or voltage signals for use by other devices.
The system operates based on the pulse flow signal provided by the flow meter to the quantitative controller. When the cumulative flow reaches the set value (quantitative value), the controller sends a switching signal to the solenoid valve or pump, allowing for valve and pump start/stop control. This enables both automatic and manual feeding control.
Currently, many companies are either using or looking to improve this type of system, especially those still relying on manual canning or feeding processes and aiming to reduce costs while improving efficiency. This system offers high accuracy, ease of operation, and on-site calibration capabilities.
The system consists of several key components:
1. **Flow Meter**: The foundation of the system, directly affecting control performance. It should have high measurement accuracy and reliable signal output. The choice of flow meter depends on factors like medium type, pipe diameter, and flow range.
2. **Temperature Sensor**: Measures the temperature of the medium and allows the quantitative controller to automatically compensate for errors due to temperature changes (optional).
3. **Quantitative Control Instrument**: Used for setting control parameters, displaying media flow, integration, and operation.
4. **Control Box**: Contains internal wiring and components, along with external buttons and indicators for user interaction (optional).
5. **Cut-off Equipment**: Can be existing pipeline equipment such as pumps or installed after a solenoid valve.
**Control Process**
After receiving the flow signal from the meter, the quantitative controller accumulates the flow and sets the required control value. When the displayed cumulative value matches the set point, the controller sends a switching signal to the cut-off device via a relay or contactor, achieving accurate flow control.
**Key Features**
- Customized control circuits and components tailored to the customer's flow meter and equipment, ensuring simple wiring and minimal on-site adjustments.
- Intuitive interface with start/stop buttons and status indicators for easy operation.
- Adjustable quantitative values that can be set directly within the controller.
- Real-time display of current accumulation, total accumulation, instantaneous flow, time, and sensor input values.
- Large and small valve control for precise flow regulation.
- Material query function to track batch numbers, feeding amounts, and quantities.
The flow quantitative controller is a modern instrument developed using advanced microcontroller technology. It offers compact size, lightweight design, simple operation, clear readings, and high reliability. Combined with pulse-output flow sensors and solenoid valves, it forms an efficient flow control system suitable for industries such as petroleum, chemical, pharmaceutical, and food processing.
Equipped with an 8-digit digital display and 5-line light column, the controller provides real-time feedback on the progress of each batch, making it easy to monitor. It features a user-friendly interface for quick parameter adjustment and control. Built-in relays with large contacts and power-off protection ensure long-term reliability and durability.
**Working Principle**
The calculation formula for a pulse-output flow sensor is:
**Q = N / K**
Where:
- Q = cumulative flow (in units)
- N = number of pulse signals
- K = meter constant (in pulses per liter)
The meter constant is pre-programmed into the controller. When the system starts, the built-in relay changes state, opening the control valve. The controller then counts the pulses from the flow sensor. When the set amount is reached, the relay returns to its original state, closing the valve and completing the quantitative control process.
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