Promag 50 Low Flow Cutoff Function Overview
Low Flow Cutoff is an important function of the Promag 50 electromagnetic flowmeter. It is used to automatically cut the flow output signal to zero when the fluid in the pipe is stationary or the pipe is empty, avoiding false flow accumulation. Correctly setting this parameter can improve measurement accuracy, especially for applications with high zero-point stability requirements such as batch control and trade settlement.
The following operations are based on the local display interface of the Promag 50 and are applicable to most working conditions. Before setting, make sure the flowmeter has been installed correctly and is powered on.
Detailed Setup Steps
1. Enter the parameter setup menu
- On the measurement screen, press the "E" key to enter the main menu.
- Use the "+" or "-" key to select the "Setup" menu, then press the "E" key to confirm.
- Select the "Process Parameter" submenu and press the "E" key to enter.
2. Find the low flow cutoff parameter
In the "Process Parameter" menu, use the "+" or "-" key to find the "Low Flow Cutoff" option. This parameter is usually expressed as a percentage or in engineering units, depending on the instrument configuration.
3. Modify and save the setting
- Press the "E" key to enter edit mode, and the current value starts flashing.
- Use the "+" or "-" key to adjust the value. It is recommended to set it to 1% to 5% of the maximum range, depending on the process requirements.
- Press the "E" key to confirm the new value, then press the "ESC" key to return to the measurement screen.
Parameter Setting Reference and Precautions
| Parameter item | Recommended value | Description |
|---|---|---|
| Low Flow Cutoff | 1%~5% of Qmax | Determined according to pipe diameter and minimum flow |
| Response time | Default 1~3 seconds | Usually no modification needed |
| Cutoff direction | Bidirectional or unidirectional | Selected according to process flow direction |
Key Precautions
- Avoid setting it too high: If the cutoff value is too large, small flows may be mistakenly cut off, affecting measurement accuracy.
- Coordinate with empty pipe detection: If the pipe is often empty, it is recommended to also enable the empty pipe detection function.
- Record the original value: Record the original parameters before modification for easy restoration or comparison.
- Verify the effect: After setting, observe the zero-point stability and fine-tune if necessary.
Through the above steps, you can quickly complete the low flow cutoff setting of the Promag 50 and improve the reliability of flow measurement.