Prosonic Flow W 400 is a clamp-on ultrasonic flowmeter designed for continuous flow measurement of liquids such as water, wastewater, cooling water, and various industrial process fluids.

Its key advantage is that it does not require pipe cutting or direct contact with the medium. The measurement is carried out externally using ultrasonic signals, which makes installation simple, maintenance low-cost, and allows installation without process shutdown.

1. Working Principle

The flowmeter is installed outside the pipe and sends ultrasonic signals through the pipe wall.

By measuring the time difference of ultrasonic signals traveling in and against the flow direction, the system calculates flow velocity. Combined with pipe size, it determines the flow rate.

👉 Simply put:
It measures flow by “listening to sound inside the pipe.”

2. Differences Between 9W4BA0 / 9W4BA1 / 9W4BA2

These three models belong to the same product family. The measuring principle is identical. The difference lies in system configuration and application reliability.

① 9W4BA0 — Standard Basic Version (1 set system)

• Configuration: 1 set
• Single ultrasonic measurement system
• Designed for standard operating conditions

Features:

• Easy installation
• Lowest cost option
• Suitable for basic flow measurement
• Stable and reliable performance

Typical applications:

• Municipal water supply
• HVAC cooling water systems
• General industrial water circuits

👉 Best for: Standard applications

② 9W4BA1 — Engineering Optimized Version

• Configuration: 1 set (optimized version)

Features:

• Single system with improved signal processing
• Better adaptability to complex installation conditions
• More stable in unstable flow or poor pipe conditions
• Suitable for engineering and project-based applications

Typical applications:

• Complex piping conditions
• Limited installation space
• Unstable or fluctuating flow conditions

👉 Best for: Challenging field conditions

③ 9W4BA2 — Dual System Redundant Version (2 sets)

• Configuration: 2 sets

Features:

• Two independent measurement systems working simultaneously
• Cross-verification of data for higher accuracy
• Redundant operation (one system continues if the other fails)
• Highest level of reliability

Typical applications:

• Custody transfer / billing measurement
• Critical monitoring points in water treatment plants
• Energy management systems
• Applications where data interruption is not acceptable

👉 Best for: High-reliability critical applications

3. Quick Selection Summary

• 9W4BA0 → Standard economic version (basic applications)
• 9W4BA1 → Engineering optimized version (complex conditions)
• 9W4BA2 → High-reliability dual system (critical measurement)

👉 Contact Us

📩 Get technical support or quotation today

If you are not sure which model (9W4BA0 / 9W4BA1 / 9W4BA2) fits your application, feel free to contact us.
Our engineers will help you choose the most suitable configuration within 24 hours.

👉 Send your inquiry now to get pricing and technical solution
👉 Fast response via Email: info@antletstech.com or WhatsApp: +86 132 7933 7527 available.