The installation of the Doppler clamp on ultrasonic flowmeter sensor needs to follow certain steps and precautions to ensure the accuracy and stability of the measurement. The following are the specific installation points:
Preparation before installation
Select the appropriate installation location
Select a straight pipe section, the length of the upstream and downstream straight pipe sections should meet the requirements of the flow meter, generally the length of the upstream straight pipe section is not less than 10 times the diameter of the pipe, the downstream straight pipe section length is not less than 5 times the diameter of the pipe, to ensure that the fluid flow at the measuring point is stable.
The installation position should be avoided near the pump, valve, elbow, reducer and other parts that may cause fluid disturbance, so as to reduce the impact on the measurement accuracy.
Choose a location that is easy to install and maintain, and leave enough space around it for easy operation and maintenance.
Try to avoid installation in places with strong vibration, so as not to affect the performance and service life of the sensor.
Clean pipe surface
Use sandpaper or a wire brush to remove impurities such as rust, oil, and paint from the surface of the pipe to ensure that the surface of the pipe is clean and smooth.
Wipe the surface of the pipe with a clean cloth or paper towel to remove dust and debris.
Check sensor
Check the appearance of the sensor for damage, cracks and other defects. If there is any problem, replace it in time.
Check that the sensor cable is in good condition and the plug socket is in good contact.
Sensor installation
Sensor mounting fixture
Place the fixture over the pipe, making sure the center of the fixture coincides with the center of the pipe.
Two transducers called A and B transducer, A is transmitting transducer and B is receiving transducer, they must be installed 180° symmetrically in order to have a more accurate measuring.
Use bolts or clamps to secure the fixture to the pipe and tighten the bolts or clamps to ensure the fixture is securely installed.
Installing a sensor
Evenly apply an appropriate layer of coupling agent, such as Vaseline, butter, etc., on the surface of the sensor to ensure good contact between the sensor and the pipe.
The sensor is installed on the fixture, so that the transmitting and receiving direction of the sensor is consistent with the flow direction of the fluid in the pipeline, and the Angle between the axis of the sensor and the axis of the pipeline should be within the range of ±45°.
Adjust the position of the sensor so that the sensor is tightly fitted to the surface of the pipe, and then fix the sensor firmly with the fixing device on the fixture.
Connecting Sensor Cables
Connect the sensor cable to the signal input end of the flow meter to ensure that the connection is correct and firm to avoid loosening or poor contact.
Bind and secure cables properly to prevent cables from being pulled or worn.
Post-installation inspection
Check installation
Check whether the sensor and fixture are firmly installed, and whether there is any loosening or displacement.
Check whether the sensor is tightly fitted to the surface of the pipe and whether the coupling agent is evenly applied.
Check whether the cables are connected correctly and securely, and whether the cables are damaged or short-circuited.
Perform debugging and calibration
Turn on the power supply of the flowmeter, debug and calibrate according to the operating instructions of the flowmeter to ensure that the flowmeter can work normally and the measurement data is accurate and reliable.
The actual flow rate can be measured on site to observe whether the display value of the flowmeter is consistent with the actual flow rate. If there is any deviation, it should be adjusted and calibrated in time.
Post time: Mar-04-2025