Troubleshooting of ultrasonic liquid level meter:
1. Instrument specifications (determine power supply form and range)
2. Use temperature and pressure
3. Measured substance (liquid, solid, name)
4. Installation site (indoor and outdoor)
5. Container structure (closed container, pool, bunker, height, width, container material)
6. Installation method and position (flange, support, opening size, flange nozzle length, whether to add pipe)
7. Fault symptoms (correct level value, incorrect value displayed, installation height, etc.)
