1. Please pay close attention to the change of water level in normal operation, regularly observe and regularly adjust the water level to make it always in the qualified range. 

2. Calibrate the alarm function of water level gauge before working and during working to ensure its work reliable; during operation, it is strictly forbidden to lift the water level alarm without authorization. 

3. When the outside load or water supply pressure changes or its combustion conditions fluctuate greatly, it is required to pay attention to the difference of the evaporation and the feed water flow, and to adjust the water level. It shall be avoided that the feed water a quantity increases or reduces greatly in order to maintain the stability of the water level as far as possible. 

4. When the main feed water is automatically adjusted, under the condition of unstable pressure and temperature, the manual regulation shall be switched in advance, in order to prevent that the digital water level gauge is influenced by the pressure temperature and fluctuates significantly, so the automatic adjusting system of feed water frequently acts to cause water level accidents.