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The flow quantitative control system is designed to work with various flow sensors and transmitters, enabling precise filling and batching control. Its key technical features include compatibility with current and pulse output flow sensors, as well as 3-point switch inputs for start-up and recovery, and 3-point control outputs for each accumulated value. It is ideal for large and small valve grading control and can trigger an instantaneous flow lower limit alarm. The system can also output the instantaneous flow value in standard current or voltage form for use by other devices.
The system primarily relies on pulse flow signals sent back to the quantitative controller by the flow meter. When the cumulative flow reaches the set value (quantitative value), the control device 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 system, especially those still relying on manual canning or feeding processes and aiming to reduce costs while increasing efficiency. This system is highly accurate, user-friendly, and can be calibrated on-site.
The system consists of several components:
1. **Flow Meter**: This is the core of the control system and directly affects its performance. A high-accuracy flow meter with reliable signal output is essential. Different types of flow meters are available, and the choice should be based on factors such as the medium being measured, pipe diameter, and flow range.
2. **Temperature Sensor**: Measures the temperature of the medium on-site and allows the quantitative controller to automatically compensate for errors caused by 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 control buttons and indicators (optional).
5. **Cut-off Equipment**: Can be existing pipeline equipment like pumps, or a solenoid valve installed after the pipeline.
**Control Process**: After receiving the flow signal from the flow meter, the quantitative controller performs internal flow accumulation and sets the required control value. When the accumulated value matches the set point, the controller sends a switching signal to the interrupting device via a relay or contactor, achieving precise flow control.
**Product Features**:
1. The control circuit and components are customized according to the customer’s specific flow meter and equipment requirements, making installation simple and requiring minimal adjustment on-site.
2. The control panel includes "Start" and "Stop" buttons, along with a "Status Indicator" display, making the interface intuitive and easy to use.
3. Each quantitative control value can be adjusted as needed directly within the controller.
4. The controller displays current and total accumulation, instantaneous flow, time, and input signal values from the flow meter.
5. It supports large and small valve control, allowing precise control of both high and low flow rates.
6. It has a material query function, enabling users to check total material quantity, each batch, and individual amounts.
The flow quantitative controller is a new generation of flow measurement and control instrument developed using advanced microcontroller technology. It is compact, lightweight, easy to operate, and highly reliable. It works with pulse-output flow sensors and solenoid valves to create a complete flow control system suitable for industries such as petroleum, chemical, pharmaceutical, and food processing.
Equipped with an 8-digit digital display and 5-line LED indicators, it shows real-time progress during each batch, providing clear and direct feedback. The user interface is user-friendly, making it easy to adjust setpoints and perform control operations. The controller includes built-in relays with large contacts and power-off protection for enhanced reliability and longevity.
**Working Principle**:
The flow sensor calculates the flow rate using the formula:
**Q = N / K**, where:
- **Q** = Cumulative flow (in units)
- **N** = Number of flow signal pulses
- **K** = Meter constant (pulses per liter)
The meter constant is stored in the controller, which automatically calculates the corresponding pulse count. When the controller starts, the relay state changes, 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 control valve and completing the flow control process.
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