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Application Notes

Clamp-On Ultrasonic Flow Meter Applications

When Should You Use a Clamp-On Flow Meter Like the XFT Series?

Short Answer:

Use a clamp-on ultrasonic flow meter when you need accurate liquid flow measurement without cutting into the pipe, introducing pressure drop, risking contamination, or shutting down the system, especially in small-diameter piping (3/8” to 1.5”) and for flow rates up to 105 GPM.

The XFT Series Clamp-On Ultrasonic Flow Meter is designed specifically for these
conditions in cooling systems, utility circuits, OEM skids, and industrial process support lines.

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What Is a Clamp-On Ultrasonic Flow Meter?

A clamp-on ultrasonic flow meter measures liquid flow by transmitting ultrasonic signals through the pipe wall.

It:

  • Has no wetted parts
  • Does not contact the fluid
  • Does not create pressure drop
  • Does not require pipe cutting

This makes it ideal for:

  • Retrofit installations
  • Clean or sensitive fluids
  • Systems where downtime is unacceptable
  • Small-diameter cooling and utility lines

What Pipe Sizes and Flow Rates Does the XFT Support?

The XFT Series is optimized for:

  • Pipe diameters: 3/8” to 1.5”
  • Flow rates: Up to 105 GPM
  • Pipe materials: Stainless steel and common plastics
  • Fluids: Water, glycol mixtures, oils, DI water, and specialty liquids
  • Viscosity: Equal to or greater than typical motor oils

This range aligns with the most common pipe sizes found in:

Can a Clamp-On Flow Meter Be Used in Data Center Liquid Cooling?

Yes, particularly in CDUs and secondary loops.

Application Examples:

Why XFT Works Well:

  • Installs on live systems without draining coolant
  • Supports stainless steel and plastic piping
  • Measures flow and temperature simultaneously
  • Enables basic thermal performance monitoring

Why Engineers Choose Clamp-On in Data Centers:

  • Avoids downtime in uptime-critical facilities
  • Eliminates leak paths
  • Simplifies retrofits in existing racks
  • Reduces commissioning time

For small-diameter liquid cooling loops, clamp-on ultrasonic
measurement eliminates the risk associated with inline turbine or mechanical
meters.

How Do You Measure Flow in Equipment Cooling Systems Without Adding Leak Risk?

Use non-invasive ultrasonic measurement.

Common applications:

  • Motor cooling
  • Drive cabinets
  • Welding systems
  • Laser cooling loops
  • Automation cell utilities

Why XFT Fits:

  • No mechanical intrusion into the pipe
  • No added pressure drop
  • Real-time and totalized flow output
  • Supports preventative maintenance diagnostics

For OEMs and maintenance teams, this reduces mechanical
complexity and long-term failure points.

Is Clamp-On Flow Measurement Suitable for Semiconductor Manufacturing?

Yes, especially for ultra-clean utilities.

Typical fluids:

  • DI water
  • Cooling water
  • Specialty process fluids

Why It’s Preferred in Fabs:

  • No contamination risk (no wetted components)
  • Compatible with small-diameter tool piping
  • Digital configuration allows tuning for:
    • Pipematerial
    • Wall thickness
    • Fluid properties

In cleanroom environments, eliminating inline sensors reduces contamination and compliance concerns.

Can You Use a Clamp-On Flow Meter in Chemical Processing?

Yes, particularly when chemical compatibility is a
concern.

Common installations:

  • Chemical dosing systems
  • Transfer skids
  • Fluid handling packages

Why XFT Is Practical:

  • No wetted parts eliminate material compatibility challenges
  • Works with plastic and metal piping
  • Suitable for oils and higher-viscosity liquids

For corrosive or sensitive fluids, avoiding direct sensor
contact simplifies design and improves safety.

Is Clamp-On Flow Measurement Good for HVAC Systems?

Yes, especially in retrofit hydronic systems.

Typical uses:

  • Chilled water loops
  • Condenser water lines
  • Terminal unit branch circuits

Advantages:

  • No pipe cutting required
  • Minimal disruption to building operations
  • Flow totalization supports energy monitoring
  • Useful for balancing and diagnostics

In building mechanical systems, installation speed and minimal disruption are often more important than ultra-high precision.

Why Do OEM Skid Builders Choose Clamp-On Flow Meters?

Common in:

  • Cooling skids
  • Filtration systems
  • Fluid handling packages

Design Advantages:

  • Eliminates inline flow meter body
  • Reduces leak paths
  • Simplifies mechanical layout
  • Reduces SKU complexity
  • Supports Modbus RTU integration with PLCs

For packaged systems, fewer mechanical penetrations mean faster builds and improved reliability.

When Is a Clamp-On Ultrasonic Flow Meter the Best Choice?

Choose clamp-on ultrasonic measurement when:

  • You cannot shut down the system
  • You want zero pressure drop
  • Fluid contamination must be avoided
  • Chemical compatibility is uncertain
  • Pipe cutting is undesirable
  • You are working with 3/8” – 1.5” piping
  • Flow is under 105 GPM

Summary: Where the XFT Series Delivers the Most Value

The XFT Series Clamp-On Ultrasonic Flow Meter is optimized for small-diameter
liquid cooling and utility lines where:

  • Installation speed matters
  • Cleanliness matters
  • Uptime matters
  • Mechanical simplicity matters

By combining:

  • Non-invasive measurement
  • Flow and temperature sensing
  • Digital configuration
  • Modbus RTU communication

The XFT provides practical flow visibility without introducing risk into critical systems.

Learn More About the XFT Series