Ultrasonic Flowmeter

Ultrasonic Flowmeter

Feature Description
Non-intrusive Measurement Clamp-on installation, no pipe cutting required
No Pressure Loss No obstruction inside the pipeline
High Accuracy & Repeatability Up to ±0.5% for transit-time type
Working Principle Based on transit-time and Doppler effect
Low Maintenance No moving parts, long service life
Application Flexibility Suitable for large pipe sizes and wide range of liquids

Key Features

Non-Intrusive Technology
  • Clamp-on installation
  • No pipe cutting required
Advanced Measurement
  • Transit-Time & Doppler principles
  • Suitable for clean & dirty fluids
No Pressure Loss
  • No obstruction inside pipe
  • Maintains system efficiency
High Accuracy
  • Up to ±1.5% (transit-time)
  • Excellent repeatability
Wide Pipe Size Range
  • DN15 to DN6000+
  • Ideal for large pipelines
Bi-Directional Measurement
  • Measures forward & reverse flow
  • Suitable for complex systems
Fluid Compatibility
  • Water, oil, chemicals
  • Slurry & dirty liquids supported
Easy Installation
  • No shutdown required
  • Portable models available
Low Maintenance
  • No moving parts
  • Long service life
Digital Output Options
  • 4–20 mA, Pulse, Frequency
  • Modbus, HART, RS485
Data Logging & Diagnostics
  • Built-in memory
  • Self-diagnostic features
Wide Operating Range
  • Works in harsh conditions
  • Depends on sensor type
Energy Efficient
  • Low power consumption
  • Battery operation possible

Working Principle

  1. Sensor Arrangement

    • Two ultrasonic transducers are mounted on the pipe:

      • In clamp-on type → outside the pipe

      • In inline type → inside the pipe

    • Transducers act as both transmitter and receiver

2. Signal Transmission

  • Ultrasonic pulses are transmitted through the fluid

  • Signals travel:

o   Downstream (with flow)

o  Upstream (against flow)

3. Transit-Time Measurement (Clean Fluids)

  • Time taken for signals is measured in both directions

  • Due to flow:

    • Downstream signal → faster

    • Upstream signal → slower

  • The time difference (Δt) is calculated

Flow velocity ∝ Time difference

4. Doppler Measurement (Dirty Fluids)

  • Based on the Doppler Effect

  • Ultrasonic waves reflect from particles/bubbles in fluid

  • Frequency shift between transmitted and received signal is measured

Flow velocity ∝ Frequency shift

5. Signal Processing

  • Electronic unit converts:

    • Time difference / frequency shift → flow velocity

  • Using pipe diameter:

  • Velocity → Volumetric flow rate (m³/h, LPM, )

6. Output Generation

  • Output signals:

o    4–20 mA

  • Pulse / Frequency

  • Modbus / HART

  • Display shows:

    • Flow rate

    • Totalizer

7. Important Working Conditions

  • Pipe must be completely filled

  • Proper sensor alignment required

  • Avoid:

    • Air bubbles (Transit-Time)

    • No particles (for Doppler → particles required)

Industrial Applications

Water & Wastewater
  • Raw, treated & sewage water measurement
  • Used in treatment plants & distribution
Power Plants
  • Cooling water flow monitoring
  • Boiler feed water systems
  • Supports energy management
Oil & Gas Industry
  • Crude & refined product measurement
  • Pipeline monitoring
  • Clamp-on for temporary measurement
Chemical Industry
  • Chemicals & solvent measurement
  • Suitable for corrosive fluids
HVAC & Building Services
  • Chilled & hot water measurement
  • Used in central AC systems
Water Distribution
  • Leak detection in pipelines
  • Non-invasive flow monitoring
Food & Beverage
  • Milk, juice & liquid products
  • Hygienic non-contact measurement
Pharmaceutical Industry
  • Clean & sterile liquid systems
  • Accurate process control
General Industrial Use
  • Process automation systems
  • PLC / SCADA integration

Technical Specifications

Parameter Specification
Measurement Principle Ultrasonic Transit-Time / Doppler
Flow Range 0.1 to 10 m/s
Accuracy ±1.5% of reading
Repeatability ±0.2%
Pipe Size Range DN15 to DN6000
Fluid Type Clean liquids / Slurries (depending on model)
Temperature Range -40°C to 150°C
Pressure Range Up to 100 bar
Power Supply 24V DC / 230V AC
Output Signals 4-20 mA, Pulse, Modbus, HART
Protection Class IP65 / IP68
Installation Type Clamp-on / Inline
Display LCD with backlight
Communication RS485 / Ethernet (optional)

Type of Transducer

Flow Transducer Model Measuring Range Temperature
Clamp On TS-2 (Small) DN25–100 -30°C to 90°C
TM-1 (Medium) DN50–700
TL-1 (Large) DN300–6000
High Temp Clamp On TS-2-HT (Small) DN25–100 -30°C to 160°C
TM-1-HT (Medium) DN50–700
TL-1-HT (Large) DN300–6000
Insertion TC-1 (Standard) DN50–6000 -30°C to 160°C
TC-2 (Extended) DN50–6000
TP-1 (Parallel) DN200–6000
Inline Standard DN15–1000 -30°C to 160°C

External Clip Probe

Technical Parameters Standard Small Sensor Standard Medium Sensor Standard Large Sensor
Applicable Pipe Diameter DN15 – DN100 mm DN50 – DN700 mm DN300 – DN3000 mm
Material Polyurethane Alloy
Working Frequency 1 MHz
Installation Method V (N, W) V, Z Z
Calibration Machine Pairing Calibration
Magnetic Available
Operating Temperature 0 – 80°C
Protection Level IP68 (Water-immersible up to 3 meters)
Medium Water, sea water, sewage, alcohol, some oils, etc. Suitable for single, uniform and stable liquids that conduct ultrasonic waves.
Applicable Pipe Material Carbon steel, cast iron, copper, PVC, aluminum, fiberglass and lined pipes.
Signal Cable SV75-2 shielded cable extendable up to 300 meters. Use metal sleeve for anti-interference. Avoid parallel wiring with high-voltage cables and interference sources like inverters.

Model Selection Table

Parameter Options
Meter Power Supply 1. 230V AC
2. 24V DC
Operating Temperature 1. Up to 80°C
2. Up to 160°C
3. Please specify
Sensor Type 1. Clamp On
2. Insertion
Sensor Size 1. Small
2. Middle
3. Large
Cable Length 1. Up to 5 meter
2. Above 5 meter
Output 1. 4 to 20 mA
2. Relay
3. Others
Communication 1. RS485 Modbus RTU
2. HART
Ingress Protection 1. IP65
2. IP67
Enclosure Type 1. Flame Proof
2. Non-Flame Proof
Test Certificate 1. Factory Certificate
2. NABL Traceability