THE IMI Sensors division of PCB Piezotronics, represented by Davidson Measurement , has released the Model 682A04 DIN-rail mountable, dual relay alarm module that is specifically designed to provide an early warning of deteriorating machinery condition.
Although capable of operation with any 4-20mA signal input, the unit is particularly well suited for vibration signal inputs due to its adjustable, 0 to 45 second time delay.
The time delay feature serves to eliminate false alarm trips due to momentary vibratory upsets, which may be caused by machinery start-ups, run downs, or vehicle drive-bys.
The unit operates with vibration sensors that directly output a 4-20mA signal or with vibration transmitters that provide a conditioned 4-20mA output signal from analog accelerometers.
The two alarm relays are Form C, can accommodate normally open or closed wiring schemes, and can handle up to 5 amps of power.
Each can be individually set for HI or LO threshold limits and employ a latching technique with a local reset button or remote reset capability.
The slim, DIN-rail mounted package supports high-density installations and features removable terminal blocks to simplify wiring.