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FU-TX 310 Clamp-on Ultrasonic Flowmeter Manual v2.
FU-TX 310 Clamp-on Ultrasonic Flowmeter Manual v2.
  • This instruction manual version is v2.1
  • 1. Product Introduction
    • 1.1 Specifications
    • 1.2 Important concepts
    • 1.3 Product features
    • 1.4 Product applications
    • 1.5 Measuring principle
    • 1.6 Product contents
    • 1.7 User interface
      • 1.7.1 Screen interfaces
      • 1.7.2 Buttons
      • 1.7.3 LED message
  • 2. Installation Method
    • 2.1 Power
    • 2.2 Ultrasonic probe
      • 2.2.1 Probe wiring
      • 2.2.2 Meter wiring
      • 2.2.3 Installation location
      • 2.2.4 Installation method
      • 2.2.5 ​Probe installation method
    • 2.3 Temperature sensor/Analog output
      • 2.3.1 Temperature sensor
      • 2.3.2 Analog output
      • 2.3.3 Wiring method
    • 2.4 Installation check
      • 2.4.1 RSSI (Signal Strength)
      • 2.4.2 Q value
      • 2.4.3 Flight time
  • 3. Output Interface
  • 4. Setting up the Interface
    • 4.1 Intial menu settings
    • 4.2 Units
    • 4.3 Meter (Measurement Settings)
    • 4.4 Communication
    • 4.5 Other
    • 4.6 Save
  • 5. Error Messages and Solutions
  • 6. Other Conditions
  • 7. MODBUS Communication Protocol
  • 8. Cautions
  • 9. Sound Speeds Data
  • LORRIC Integration and Application Center
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6. Other Conditions

Previous5. Error Messages and SolutionsNext7. MODBUS Communication Protocol

Last updated 5 years ago

A. The measured value jumps sharply Under some conditions, when the fluid flow rate is fast the measured value may jump sharply. This may be caused by a poor startup of the ultrasonic signal waveform as shown in the following figure:

The figure on the left shows poor signal waveform startup. The wave heights near the trigger level are all similar, a phenomenon which can easily lead to a trigger time point error, which in turn leads to a jump in the value due to the resulting time difference calculation error. The correct signal waveform should be as shown on the right, with sufficient drop height between waves. Possible causes of a poor initial waveform are shown below:

1. Z-type configuration : Probe axis is off-center. Adjust the probe position.

2. V type configuration : Probe distance error. Adjust the probe distance according to the signal strength.

3. V-type configuration: Probe axis and pipeline are not parallel. Adjust the position.

It is also possible that in the initial settings, the pipe’s outer diameter setting is larger than the actual diameter. If this is the case, re-measure and adjust the setting, then fine-tune the configuration according to the displayed probe distance. If there is still a jump after this operation is completed, then the Meter → 16.Anti-noise​ function in the setting options can be switched on to control the problem.