Our economical vibration transmitters use the "industrial standard" two-wire, single-loop technology with a 4-20 MA ouput that is proportional to the vibration level. Our transmitters are used with either Model 1112 Vibration Monitors to provide alarm and shutdown capabilities, or wired directly into PLC's, DCS or most standard commercial and industrial control systems. Model 401 Monitor is a dual channel, continuous monitor with display that measures in velocity or displacement.