12 July 2006 -- The IMI Sensors Division of PCB Piezotronics has introduced a range of electronic and mechanical vibration switches for protecting critical machinery from costly failure, by initiating an alarm or shut down when excessive vibration is detected. The electronic switches require power to operate and utilise an input signal from an on board or remote accelerometer, whereas the mechanical switches do not require power and utilise the resistive force and travel of a spring as a measure of vibration amplitude. Of particular interest is the model 686A, which is a two wire solid-state relay, electronic vibration switch that is microprocessor controlled, with no moving parts or mechanical adjustments.
This switch is supplied factory set to a selected threshold value and delay time, or can incorporate as an option a Magnetic Adjustable Vibration Threshold (MAVT) to enable adjustment of the threshold of the switch through a magnetically activated internal sensor, while it is installed on running machinery.
This switch installs using the same mounting techniques as a conventional vibration sensor and connects with a conventional two-pin connector or integral cable.
