Non-Intrusive Clamp-On
External transducers clamp onto the pipe outside; zero line cutting, zero welding, and zero leak paths.
Flow Meters
Clamp-On Type Ultrasonic Flow Meter
Non-Intrusive Liquid Flow Measurement Without Pipe Modification
Precision Transit-Time Flow Sensing with External Transducers
The FlowDo Clamp-On Type Ultrasonic Flow Meter measures volumetric liquid flow from outside the pipeline. Utilizing high-frequency acoustic transit-time technology, it eliminates the need to cut pipes, depressurize systems, or interrupt critical operations. Available in portable Handheld Type for field audits and fixed Wall-Mount Type for permanent process monitoring.
NON-INTRUSIVE
Zero Pipe Cutting
TRANSIT-TIME
Acoustic Principle
DUAL FORMATS
Handheld & Wall-Mount
ZERO SHUTDOWN
Live Line Setup
Product Overview
External Clamp-On Measurement for Industrial Pipelines
FlowDo Clamp-On Type Ultrasonic Flow Meters determine process flow rate using external acoustic transducers clamped onto the pipe wall.
The FlowDo Clamp-On Ultrasonic Flow Meter operates by transmitting high-frequency sound pulses diagonally across the fluid stream. The difference in travel time between sound travelling downstream with the fluid versus upstream against the fluid is directly proportional to the flow velocity.
Because transducers are clamped to the pipe exterior, the meter never contacts the process fluid. This eliminates internal sensor corrosion, fluid contamination, and hydraulic pressure loss, making it ideal for clean water, cooling circuits, chemicals, and industrial monitoring.
Selection Guidance: Meter and transducer selection depends on pipe outer diameter, pipe material, wall thickness, pipe liner, fluid acoustic properties, process temperature, and whether portable or continuous monitoring is required.
Key Engineering Principles
- Non-invasive acoustic transit-time flow velocity measurement
- Zero pipe penetration — installation without line shutdown or pressure loss
- Dual product configurations: Handheld battery-powered and Wall-Mount continuous
- Adaptable to diverse pipe materials (Carbon steel, Stainless, Cast iron, PVC, HDPE)
- Digital display with signal quality indicator, instantaneous rate, and flow totalization
- Standard 4–20 mA current loop, pulse output, and RS485 Modbus RTU telemetry
FLOWDO • CLAMP-ON
124.6
m³/h • FLOW
Direct Reading
Instantaneous Flow Indication
High-contrast digital readout displays live volumetric flow rate, flow velocity (m/s), and signal quality on-site.
Accumulation
Forward & Net Totalization
Configurable totalizers accumulate positive, negative, and net volumetric flow for billing, auditing, and water balance.
Signal Output
Standard 4–20 mA & Modbus
Standard current output and RS485 serial communication integrate directly into PLCs, data loggers, and FlowDo IoT Cloud.
Product Configurations
Handheld Portable vs. Wall-Mount Fixed
Two distinct operational formats tailored for temporary field auditing or permanent process automation.
Portable Auditing
Handheld Type Clamp-On Flow Meter
Designed for field technicians, energy auditors, and maintenance teams requiring quick flow verification across multiple pipe locations.
- Rechargeable lithium battery operation with long field runtime
- Integrated SD card / internal memory data logging with USB export
- Lightweight ruggedized field enclosure with carry case
- Magnetic and chain mounting fixtures for fast setup
Fixed Installation
Wall-Mount Type Clamp-On Flow Meter
Designed for permanent plant installation requiring continuous flow monitoring, PLC integration, and cloud telemetry.
- Continuous AC mains (85–264 VAC) or 24 VDC industrial power
- Industrial IP65/IP67 wall/panel mount enclosure
- Standard 4–20 mA current output and RS485 Modbus RTU
- Pulse/relay totalization outputs and FlowDo IoT Cloud integration
Instrumentation Capabilities
Key Features
Engineered for dependable flow sensing across industrial utility and process piping systems.
Zero Pressure Loss
The pipe interior remains completely unrestricted, conserving pumping energy and maintaining line pressure.
Transit-Time Precision
Measures sound travel time differential with sub-nanosecond resolution across upstream and downstream paths.
Digital Display
Backlit LCD shows real-time flow rate, fluid velocity, positive/negative totalizers, and acoustic signal strength.
Battery or Mains Power
Available in rechargeable battery portable unit or continuous AC/DC industrial mains powered transmitter.
Industrial Outputs
Standard 4–20 mA DC analog current loop, OCT pulse, and RS485 Modbus RTU communication interfaces.
Multi-Mount Modes
Supports V-Method, Z-Method, and W-Method acoustic reflection paths to optimize signal for pipe size.
IoT Telemetry Ready
Seamlessly connects to FlowDo IoT Cloud for live dashboard monitoring, mobile alerts, and audit reporting.
Operational Advantages
Why Choose Clamp-On Ultrasonic Flow Measurement
Key operational and economic benefits delivered by FlowDo Clamp-On Flow Meters.
No Process Interruption
Install and commission in minutes while pipelines are fully pressurized and actively operating.
No Moving Parts
With no mechanical impellers or rotating turbines, the system experiences zero mechanical wear.
Zero Wetted Contact
Ideal for corrosive chemicals, ultra-pure water, and sanitary fluids because transducers never touch liquid.
Survey Multiple Lines
Use the Handheld unit to verify flow rates across dozens of pipeline locations with a single instrument.
Bidirectional Sensing
Measures both forward and reverse liquid flow with independent totalizers for each direction.
SCADA & IoT Connected
Integrates directly into plant automation skids or FlowDo IoT Cloud for 24/7 remote visibility.
Technical Configuration
Product Specifications
Comprehensive technical specification architecture for FlowDo Clamp-On Ultrasonic Flow Meters.
Brand / Manufacturer
FlowDo (Flowdo Process Instruments Pvt. Ltd.)
Product Name
FlowDo Clamp-On Type Ultrasonic Flow Meter
Primary Category
Flow Meters
Product Variants
Handheld Type (Portable) • Wall-Mount Type (Fixed)
Measurement Principle
Transit-Time Difference Ultrasonic Flow Measurement
Primary Measurement
Volumetric Liquid Flow Rate & Flow Velocity
Pipe Size Range
According to selected transducer pair / application
Flow Velocity Range
According to selected model (typically 0.1 to ±30 m/s bidirectional)
Accuracy
According to selected model / pipe and fluid conditions
Repeatability
According to selected model
Transducer Type
External Clamp-On Transducers (Zero pipe cutting)
Mounting Methods
V-Method, Z-Method, or W-Method (selected based on pipe size)
Acoustic Couplant
Acoustic silicone / grease / high-temperature paste
Compatible Pipe Materials
Carbon steel, Stainless steel, Cast iron, PVC, HDPE, Copper, Fiberglass
Supported Liquids
Clean liquids and compatible process fluids capable of transmitting acoustic sound
Suspended Solids / Bubbles
Low solid/bubble content recommended for transit-time acoustics
Process Liquid Temperature
According to selected transducer model (standard & high-temperature options)
Display Screen
Integrated backlit digital LCD (Flow rate, Velocity, Totalizers, Signal Quality)
Analog Output
4–20 mA DC (standard on Wall-Mount model)
Digital Communication
RS485 / Modbus RTU (available on selected configurations)
Totalization
Positive, Negative, and Net Volumetric Totalizers
Data Logging
Integrated logging / export supported on Handheld model
Power Supply (Handheld)
Rechargeable Lithium-ion battery pack with AC charger
Power Supply (Wall-Mount)
85–264 VAC mains or 24 VDC industrial power
Enclosure Rating
IP65 / IP67 / IP68 submersible transducer options
Cloud Telemetry
Compatible with FlowDo IoT Cloud via telemetry gateway
Final Technical Specifications Note: Final specifications depend on selected model (Handheld vs. Wall-Mount), line size, transducer frequency, and process application. Provide pipe diameter, wall thickness, pipe material, liquid name, and required outputs for engineering selection.
Industry Applications
Where FlowDo Clamp-On Flow Meters Excel
Widely deployed across utilities, manufacturing facilities, water distribution, and energy auditing.
Water Distribution
Potable water supply pipelines, pump stations, flow audits, and leak detection surveys.
HVAC Chilled & Hot Water
Thermal energy metering, cooling tower balance, and chiller plant efficiency monitoring.
Energy & Water Auditing
Temporary survey verification of existing inline meters, pumps, and heat exchangers.
Chemical & Corrosive Lines
Monitoring acids, alkalis, and solvents without risking sensor corrosion or leak hazards.
Ultra-Pure & Pharma Water
Zero-wetted measurement preserves sanitary purity in semiconductor and pharma loops.
Industrial Effluent & Reuse
Treated effluent discharge, process cooling, and recycled water monitoring across plants.
Frequently Asked Questions
Clamp-On Ultrasonic Flow Meter FAQs
Detailed technical answers regarding FlowDo Clamp-On Ultrasonic Flow Meters.
What is a Clamp-On Type Ultrasonic Flow Meter?
It is a non-intrusive flow measurement instrument that uses external acoustic transducers clamped to the pipe exterior to measure liquid flow without pipe modification or shutdown.
How does the transit-time principle work?
Acoustic signals travel faster when moving with liquid flow and slower when moving against it. The difference in travel time (Δt) is directly proportional to fluid velocity.
Is pipe cutting required for installation?
No. Transducers clamp securely to the outside of the pipe. There is zero welding, zero drilling, and zero process downtime.
What is the difference between Handheld and Wall-Mount?
The Handheld unit is battery-powered and portable for field surveys and logging across multiple lines. The Wall-Mount unit is permanently powered (AC/DC) with fixed analog/digital outputs for continuous process control.
What liquids can be measured?
Compatible with clean liquids and homogeneous fluids that transmit ultrasound, including raw water, chilled water, treated effluent, glycols, and compatible process chemicals.
Can it measure in pipes with internal liners?
Yes, provided the liner is acoustically bonded to the pipe wall without air gaps. Liner material and thickness are configured during meter setup.
What mounting methods are available?
Supports V-Method (transducers on same side, reflected beam for medium pipes), Z-Method (opposite sides, direct beam for larger pipes), and W-Method (multiple reflections for small lines).
Why is acoustic couplant gel required?
Couplant eliminates microscopic air pockets between the transducer face and pipe surface, ensuring efficient ultrasound transmission into the pipe wall.
Does it cause pipeline pressure loss?
No. Because no sensor or obstruction enters the pipe, hydraulic pressure loss is zero.
Can it connect to SCADA and FlowDo IoT Cloud?
Yes. The Wall-Mount unit provides standard 4–20 mA and RS485 Modbus RTU outputs compatible with PLCs, DCS systems, and FlowDo IoT Cloud telemetry.
Need Help Selecting a Clamp-On Flow Meter?
Choose the Right Handheld or Wall-Mount Configuration
Share your pipe size, pipe material, wall thickness, process fluid, flow range, and temperature with FlowDo to identify the appropriate Clamp-On Ultrasonic configuration.
For faster selection, provide: Handheld / Wall-Mount • Process Fluid • Pipe Outer Diameter • Pipe Material • Wall Thickness • Pipe Liner • Minimum Flow • Normal Flow • Maximum Flow • Process Temperature • Required Output