Prosonic 92F Low Flow Cutoff Setting Guide
Prosonic 92F is an ultrasonic flowmeter commonly used in industrial sites. Its low flow cutoff function can effectively suppress signal fluctuations caused by micro-flow in pipelines and ensure measurement stability. This article is intended for engineering technicians and procurement personnel, introducing the specific setting steps and key points.
What is Low Flow Cutoff?
Low Flow Cutoff means that when the flow rate is below a set threshold, the instrument automatically sets the output to zero or a fixed value, avoiding false flow readings caused by medium disturbance, bubbles, or vibration. This function is crucial for the stability of ultrasonic flowmeters under low-flow conditions.
Typical Application Scenarios
- Slow flow of residual liquid in the pipeline after the pump stops
- Micro-leakage caused by incomplete valve closure
- Signal fluctuations caused by bubbles or suspended solids
Setting Steps
Enter the parameter menu through the local display interface or debugging software, and follow the procedure below:
- Enter the main menu and select "Flow Parameters" or "Output Settings".
- Find the "Low Flow Cutoff" option.
- Enter the cutoff value, usually expressed in flow units (such as m³/h). It is recommended to set it to 1%~3% of the full scale.
- Confirm and save, then return to the measurement interface to observe whether the output is stable.
Parameter Recommendations and Comparison
The selection of the cutoff value under different working conditions requires a balance between sensitivity and stability. The table below provides a reference:
| Working Condition | Recommended Cutoff Value (% of Full Scale) | Description |
|---|---|---|
| Clean liquid, stable flow | 1% | Preserves the ability to detect micro-flow |
| Contains bubbles or suspended solids | 2%~3% | Suppresses fluctuations at the cost of some low-flow accuracy |
| Frequent pump start/stop | 3%~5% | Avoids false accumulation during start/stop transitions |
Precautions
- The cutoff value should not be too large; otherwise, real low-flow signals will be lost.
- After setting, perform zero calibration to ensure the output is zero when there is no flow.
- If the medium in the pipeline tends to generate bubbles, it is recommended to also enable the empty pipe detection function.
- After changing the cutoff value, it should be recorded and relevant process personnel should be notified.
Summary
Correctly setting the low flow cutoff of the Prosonic 92F can significantly improve the reliability of flow measurement. It is recommended to select a cutoff value of 1%~5% according to actual working conditions, and combine it with zero calibration and empty pipe detection to balance accuracy and stability.