CXT/50P-(A) monitoring system applies to various level-jib tower cranes, which provides the operator with actual and correct information on working states of tower crane. When the load reaches the rated load or the specified moment force or the hook is near to the protected zone, it will give alarm and act correspondently. As one of our top products, it adds the functions of powerful zone protection and remote monitoring. It also supports telecommunication, which enhance the efficiency of in-service tower cranes. Parameters and functions are shown as follows: Parameter: Rated load, actual load, trolley amplitude, hook height, slewing angle and moment percentage Signal lamp & buzzer: Flickering yellow lamp and buzzers discontinuous response indicates early warning, whereas red lamp and buzzers continuous response indicates alarm and relay outputs. Other functions: Records downloading; Sensors' self-diagnosis; Remote control; Zone protection; Applicable to level-jib tower crane with variety of falls.