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The three most common faults of liquid level switches at present are: A: the instrument displays codes such as ERR01, ERR12, ERR14, etc.; B: the instrument gives false alarms; C: the instrument’s screen goes black. I. Main reasons for the ultrasonic external level switch displaying ERR01, ERR12, ERR14: ERR01: Incorrect parameters; ERR12: Fault in the transmitting sensor at position 1; ERR14: Fault in the receiving sensor at position 1. Solutions: ① If ERR01 is displayed, restore the factory settings and re-perform calibration; if the problem persists, contact Dinghua Electronics’ customer service. ②ERR12 and ERR14 are displayed; you may try restoring the factory settings or powering off and restarting the device. If the error persists, check whether there are any loose or disconnected connections in the three-way junction box and the terminal cables inside the main unit. ③If both ① and ② are confirmed to be normal, it is necessary to check the probe and the coupling condition. The level switch’s transmitting probe emits a \"beep beep beep\" sound when in operation; the other two probes can be interchanged, and their impedance is 0.4 mΩ ； If coupling is lost, the probe must be reinstalled to ensure a tight seal. II. Main reasons for the “false alarms” of ultrasonic external level switches: 1. Improper installation of the probe ； Handling method: ① Remove the probe to check whether the installation surface is clean; the paint on the tank wall must be sanded off to expose the metal surface, which should feel smooth with no rust spots, and the probe’s surface must be free of dirt, so that the probe can adhere tightly to the tank wall. ②If coupling fails or there is no coupling, reinstall the probe, apply coupling agent as required, install it properly, and ensure a tight seal. ③Explosion-proof flexible hoses must not be subjected to high torque forces, and they should be protected from being struck by external objects. 2. Coupling loss ； Solution: Check, re-apply coupling agent, and install the probe. 3. Loose or disconnected wiring. Solution: ① Check whether there are any loose or disconnected connections in the tee junction box and the terminal probe cables inside the main unit. ②The output cable can be used in conjunction with the meter relay to detect open or closed circuits, ensuring unobstructed wiring. 4. Incorrect settings for the relay’s normally open and normally closed states ； Solution: Check parameter 20#; set it to 0 for no liquid suction, and to a value other than 0 for normal operation with liquid present ； Let 1 denote normal closed with liquid suction, and normal open without liquid. 5. The energy value experiences drift. Handling method: Re-trigger and calibrate. Parameter No. 1: Trigger calibration for high liquid level at position No. 1; set it to 1 and confirm with a click ； ②Parameter No.: 1 indicates that calibration is triggered when the liquid level at position 1 is low; set to 1 for confirmation ； ③Parameter No. 1: Triggers calibration and reset at position 1; set to 1 for confirmation ； ④Parameter No. 2: Triggers high liquid level calibration at position 2; set to 1 for confirmation ； ⑤Parameter No. 2: Triggers low liquid level calibration at position 2; set to 1 for confirmation ； ⑥Parameter No. 2: Calibration and reset trigger at position 2; set to 1 for confirmation. 1) Single-point switch; set parameter 3# to 1, which corresponds to clearing the instrument calibration. When the actual liquid level is higher than the probe position, set parameter 1# to 0 and confirm by clicking ； The actual liquid level is below the probe position; set parameter 2# to 1 and confirm by clicking. 2) Two-point switch; set parameters 3# and 6# to 1, which is equivalent to clearing the calibration settings for the high and low level switches. When the actual liquid level is below the position of the low-level sensor, set parameters 2# and 5# from 0 to 1, then confirm by clicking ； The actual liquid level is above the low-level probe and below the high-level probe; set parameter 0 for 1# and 5# to 1, then confirm by clicking ； If the actual liquid level is higher than the position of the high-level probe, set parameter 0 for 1# and 4# to 1, then confirm. III. Main reasons for the “black screen” on ultrasonic external level switches; Solutions for power supply issues: ① Check the power supply – generally, instruments require DC24V for operation. ② Check whether the wiring is intact. 2. Hardware failures and other solutions: Contact Dinghua Electronics.