We are offering liquid level controller and liquid level switch. Applicationwhile primarily designed for ammonia, this control is also suitablefor r-22 and other non-corrosive liquidsthat have a specific gravity of 0.5 or more.The controller is ideal for the control of the operating level of liquidin liquid refrigerant accumulators and separators.Although this is normally done with a solenoid valve, the controllercan activate analarm or a pump or similar device. Safe working pressure : 300 psi