The fault of the instrument should be judged from the following three aspects:

1、 Is the power supply to the instrument normal

Determine whether the power supply voltage is stable, current driving ability, whether the cable is disconnected, whether the wiring is correct, and whether the power supply is noisy

2、 Is there any malfunction in the instrument itself

(1). If there is no problem with the power supply and the instrument does not display or work, it indicates that there are damaged components inside, or there are other reasons for component damage, such as water ingress or lightning strikes inside the meter.

(2). If the instrument displays but does not work, and the echo receiving indicator symbol does not flash (towards the ground or wall), it indicates that there is a malfunction inside the instrument.

(3). If there is a display on the instrument, the echo reception indicator is flashing, but the distance indicator value is very small (i.e. the level value is large). If the distance value is equal to or close to the blind spot value, it indicates that the instrument is working in the blind spot

Internally, internal parameters should be modified to increase the cutoff distance value; It is also possible that the electromagnetic interference at the installation site is too strong.

3、 Installation issues

(1). The installation port is too small and the probe cannot be inserted; The flange connection is too long; The inner wall of the installation port is rough and uneven; Objects with reflected sound waves on the side walls of containers can cause the level measurement value to be too high, approaching full range

(2). The probe installation is not vertical and too inclined; Improper setting of installation height, level fullness, and other parameters can result in undetectable or low level values

4、 Application environment issues

(1). The liquid has large fluctuation, strong volatility and foam, which makes it impossible to detect normally

(2). Material level measurement, with high dust and steep material surface

(3). Electromagnetic interference (mainly split type instruments) causes the level measurement value to be too high and close to full range

(4). There is a significant difference in sound velocity between the gas inside the chemical tank and the sound velocity in the air

(5). The usage temperature is too high, causing drastic temperature changes