Detection of anomalous movement in a reciprocating device

A system for identifying an anomalous movement of a reciprocating element in a reciprocating device, the system comprising:

• a first sensing device for sensing a first component of a vibration signal of the reciprocating element, the first component having a first frequency range;
• a second sensing device for sensing a second component of the vibration signal of the reciprocating element, the second component having a second frequency range different than the first frequency range;
• and
• a device for at least one of analyzing or displaying at least one of the first and the second components of the vibration signal, wherein the vibration signal includes positional data of the reciprocating element along at least one axis of the reciprocating element.

A reciprocating device comprising:

• a reciprocating element;
• at least one non-reciprocating element through which the reciprocating element passes;
• and
• at least one sensing device for sensing a vibration signal of the reciprocating element, wherein at least a portion of the at least one sensing device is located within the at least one non-reciprocating element and the vibration signal includes positional data of the reciprocating element along at least one axis of the reciprocating element.