A weak ultrasonic signal is a common problem during clamp-on ultrasonic flow meter installation. If the TF1100-DC displays a weak signal or unstable readings, the cause may be related to the pipe, transducer mounting, or liquid conditions.
Before replacing the instrument, check the following factors.
Incorrect Pipe Parameters
The ultrasonic flow meter needs accurate pipe information to calculate the correct transducer spacing. Check the pipe outside diameter, wall thickness, material, and liner details. Incorrect settings may result in poor signal reception or inaccurate flow measurement.
Poor Transducer Contact
The clamp-on ultrasonic transducers must have good acoustic contact with the pipe surface. Clean the mounting area, remove loose rust or dirt, and apply the recommended acoustic coupling compound. Ensure that the transducers are firmly secured.
Unsuitable Installation Location
Elbows, pumps, valves, and reducers can disturb the flow profile and affect measurement stability. Where possible, install the sensors on a suitable straight pipe section, following the manufacturer’s recommended upstream and downstream distances.
Air Bubbles or Suspended Solids
Transit-time ultrasonic flow meters work best with liquids that transmit ultrasonic signals effectively. Excessive air bubbles or suspended particles may weaken the signal. If the liquid contains substantial solids or gas bubbles, consult the manufacturer about whether a Doppler ultrasonic flow meter is more suitable.
Pipe Wall and Liner Conditions
Thick pipe walls, unsuitable pipe materials, or loose internal liners can interfere with ultrasonic transmission. Plastic pipes may also require careful transducer selection.
To improve TF1100-DC ultrasonic signal strength, verify the pipe parameters, transducer spacing, coupling compound, installation location, and liquid conditions.
For technical assistance, provide Lanry Instruments with the pipe material, diameter, wall thickness, liquid type, and operating temperature.
Post time: Oct-12-2026