The SM type side mounted floating ball liquid level controller is suitable for controlling the liquid level in open or pressure vessels during industrial production processes. When the liquid level reaches the high and low limits, the relay contacts can be used as signal alarm devices or switches in circuits such as electric pumps. This controller is suitable for industries such as water treatment, petrochemicals, boilers, and ships. Due to its flexible structure and wider temperature and pressure range, it can fully replace UQK series products.