Common faults and solutions encountered in the use of ultrasonic flowmeters for sewage
Common faults and solutions encountered in the use of ultrasonic flowmeters for sewage
1. The instantaneous fluctuation of the ultrasonic flowmeter for sewage is large
Cause of failure: Large fluctuations in signal strength; The fluid it measures itself fluctuates greatly
Solution: Adjust the probe position properly, enhance the signal strength to ensure its stability. If the fluid itself fluctuates greatly, the position is not good. Select new points to ensure the working conditions for the first 10 days and the following 5 days are met.
2. The reading of the ultrasonic flowmeter for sewage is inaccurate
Cause of malfunction
1) The sediment installed at the top and bottom of the horizontal pipe interferes with the ultrasonic signal;
2) The sensor is installed on a pipe where water flows downward and the pipe is not filled with fluid
Countermeasures for handling
1) Install the sensors on both sides of the pipeline;
2) Install the sensor on the pipe section filled with fluid;
3. The ultrasonic flowmeter sensor for sewage is good, but the flow rate is low or there is no flow rate at all
Cause of malfunction
1) Due to the paint and rust on the outside of the pipeline not being removed thoroughly;
2) The surface of the pipe is uneven or it is installed at the welding joint;
3) The roundness of the pipe is poor, the inner surface is not smooth, and there is scale formation on the pipe lining. If the pipe material is cast iron pipe, this situation may occur.
4) The measured medium is a pure substance or the solid suspended matter is too low;
5) The sensor is installed on the fiberglass pipe.
6) If the sensor is installed on a sleeve, it will weaken the ultrasonic signal.
7) Poor coupling between the sensor and the pipeline, with gaps or bubbles on the coupling surface;
Countermeasures for handling
1) Clear the pipeline again and install the sensor;
2) Grind the pipe smooth or away from the weld seam;
3) Select pipe materials or linings with smooth inner surfaces such as steel pipes;
4) Select other suitable types of instruments;
5) Remove the glass fiber;
6) Move the sensor to the pipe section without a casing;
7) Reinstall the coupling agent;
4. There is no display when the ultrasonic flowmeter for sewage is turned on
Cause of failure: The power supply voltage does not correspond to the rated value of the instrument or the fuse has blown.
Solution: Check whether the power supply voltage corresponds to the rated value of the instrument and whether the fuse has blown. If it is not due to the above reasons, notify the professional personnel of the manufacturer to handle it.
5. After startup, the instrument is backlit without any character display. Cause of failure: Generally, it is due to the loss of the chip program.
Solution: Notify the professional personnel of the manufacturer to handle it.
6. The instrument cannot be used under strong interference on site.
The cause of the fault: The power supply fluctuates greatly, or there are frequency converters or strong magnetic field interferences around, or the grounding wire is incorrect.
Solution: Provide a stable power supply for the instrument; Or install the instrument away from frequency converters and strong magnetic field interference; Or set up grounding wires in a standardized manner.
