What are the control methods for the water level protection control of hot water boilers?

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1. Visual water level gauges: Depending on the size of the boiler, there are generally two types of such gauges: one is monochromatic； Another red and green color combination. 2. Electrode-type water level controller. The feed water pump operates with the help of an electrode-based controller; the hot water boilers in Henan maintain the water level within a certain range, thereby enabling automatic feed water supply. If the boiler’s water level drops to the safe level, an alarm is triggered, and the feed water pump is activated automatically to top up the water level. Once the level continues to drop and reaches the critical level, the pump stops working immediately. In large-capacity boilers, a linked control system operates the electric feed water control valve to keep the water level stable. 3. Limit low water level cut-off gas: The WNSCQ type boiler is equipped with a limit low water level cut-off gas. Based on the principle of different electrical conductivities, when the water level drops to its limit value and the feed water pump fails to supply water, the burner stops operating immediately, the gas supply is cut off, and an alarm is issued.