During the use of ultrasonic flowmeters, many users may encounter the situation where the screen shows no response after power-on. There is no need to rush to send it back for repair; you can troubleshoot step by step as follows:
Step 1: Check the power supply system. First, confirm whether the power adapter is plugged in tightly. If industrial power is used, a multimeter should be used to measure whether the input voltage is within the rated range of the equipment (usually AC 220V±10% or DC 24V±5%). If the voltage is abnormal, first check whether the circuit wiring is loose or if there is a short circuit, such as whether the power cord is crushed and damaged, or if the neutral wire and live wire are connected in reverse. If battery power is used, check whether the battery power is sufficient. Some devices will automatically cut off power for protection when the battery is low; in this case, just replace the battery with a new one.
Step 2: Check the hardware connection of the equipment. After turning off the power, open the equipment casing (note that power-off operation is required to avoid electric shock), and check whether the connecting wire between the internal main board and the display screen is loose and whether there are oxidation marks at the interface. If the connecting wire is loose, reinsert and fix it; if the interface is oxidized, wipe the interface with an alcohol pad before reconnecting. At the same time, check whether the fuse is blown. If it is blown, replace it with a fuse of the same specification (usually 2A/250V). Before replacement, ensure there is no short circuit to avoid re-blowing.
Step 3: Judge the status of the core components of the equipment. If the power supply and wiring are normal but there is still no display when powered on, the display screen or main board may be faulty. At this time, you can try to connect the computer software supporting the equipment. If the software can recognize the equipment, it indicates that the main board is normal, and the display screen is probably damaged, so you need to contact the manufacturer to replace the display screen; if the software cannot recognize the equipment, the main board may be faulty. You need to record the equipment model and fault phenomenon, and contact technical support for further maintenance.
Post time: Oct-21-2025