No. The "filament effect" suggesting that sensor amplifiers fail like a light bulb from repeated switching on and off is a myth. Piezoelectric accelerometer amplifiers are high reliability, low power [...]
Yes. Multiplexing provides a convenient, cost effective way to take trend data and reduce cabling costs on permanently installed systems. Sensor turn-on time should be considered and a delay programm [...]
Junction boxes provide a cost effective transition between walk-around data collection and permanent on-line monitoring systems. They also improve job safety by removing the data taker from dangerous [...]
When using two conductor shielded cable from the sensor and a single barrier strip, the cable shield should be tied to machine ground through the sensor housing and terminated before the hazardous si [...]
The barrier strip should be located outside the hazardous area and mounted near the junction box, multiplexer, or monitoring system. When using single barrier strips, the common signal carrier is gro [...]
At the sensor, the cable should be strain relieved with enough flex to allow full movement of the machine and ease removal during maintenance. When routing the cable, both conduit and cable tie downs [...]
Vibration signals from low impedance accelerometers do not crosstalk between cables in normal operation. In the rare application where very high amplitude signals are being carried next to very low a [...]
In general, the cable should not be routed alongside or parallel to high current carrying wires. If the installation requires that the low signal carrying sensor cable be routed alongside the high cu [...]
When using coaxial cables, the shield carries common and therefore, is grounded at the monitoring system. The shield must be isolated from the sensor housing to prevent ground loops. When using two c [...]
Two conductor shielded is preferred for four reasons. Unlike coaxial cable where the shield is a signal carrier, two conductor signal carriers are enclosed by the shield and not directly exposed to e [...]
