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TLU-D Ultrasonic Water Meter

TLU-D Ultrasonic Water Meter

The TLU-D ultrasonic water meter is based on the transit-time principle and is specially designed for bulk supply metering and district/sub- metering in municipal water networks. It is also suitable for a wide range of industrial applications.

The meter adopts multi-path ultrasonic measurement technology for excellent performance under complex flow conditions. Powered by a 3.6 V lithium battery, it is ideal for sites without external power. Optional NB-IoT, 4G and RS-485 communication interfaces support remote data collection and management.

Main Advantages

  • No mechanical moving parts, maintenance-free, stable and reliable
  • Excellent low-flow sensitivity compared with conventional water meters
  • Multi-path acoustic design improves adaptability and accuracy under complex flow conditions
  • lP68 protection for long-term underwater operation
  • Bi-directional flow measurement
  • Critical parameters are locked after factory calibration to protect data security
  • Built-in temperature sensor, optional pressure sensor for integrated flow, temperature, pressure monitoring
  • 0.5s measurement cycle with fast response
  • Integrated communication module, optional 4G, NB-IoT or RS-485
  • Bluetooth interface for on-site meter reading

Technical Specifications

Name TLU-D Ultrasonic Water Meter
Nominal Diameter DN40-300
Turndown Ratio (Q3/Q1) 160 / 250 / 400 / 500
Accuracy Class Class 1 / Class 2
Body Material Aluminum alloy, stainless steel, carbon steel
Nominal Pressure 1.0 MPa / 1.6 MPa
Acoustic Path Configuration Dual-path for DN50; Four-path for DN80 and above
Measured Medium Water and other homogeneous liquids with a fully filled measuring tube
Ambient Temperature -25 ℃ to +55 ℃
Temperature Class T50
Pressure Loss Class Δp25
Protection Class IP68, suitable for long-term underwater operation
Electromagnetic Environment Class Class E2
Environmental Class Class O
Data Storage EEPROM stores totalized flow and cumulative operating time; data is retained after power loss; Up to 6 years of monthly records, 2 years of daily records, and 2 months of hourly records
Power Supply 3.6 V lithium battery
Remote Communication Optional 4G, NB-IoT or RS-485
Bluetooth Communication Low-power Bluetooth, compatible with BLE 4.0 / 4.1 / 4.2 / 5.0
Display Items Instantaneous flow (m³/h), totalized flow (m³), flow velocity (m/s), medium pressure, date, clock, flow

direction, battery level, empty-pipe alarm, etc.
Keypad Magnetic key
Reference Standards ISO 4064 , OIML R 49

Metering Performance Parameters

DN

(mm)

 Turndown Ratio

Q3/Q1

 Minimum

Flow

Q1 (m³/h)

 Transitional

Flow

Q2 (m³/h)

 Permanent

Flow

Q3 (m³/h)

 Overload

Flow

Q4 (m³/h)

 Accuracy

Class
50  

 

160

200

250

400

500

 0.08 0.13 40 50  

 

 

 

Class 1

Class2
65 0.13 0.20 63 78.75
80 0.20 0.32 100 125
100 0.32 0.51 160 200
125 0.50 0.80 250 312.5
150 0.80 1.28 400 500
200 1.26 2.02 630 787.5
250 2.00 3.20 1000 1250
300 3.20 5.12 1600 2000

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