Seismic vibration instrumentation is used to measure structural vibration on bearing housings, piping, machinery housings, and machine support structures. It is particularly suitable for machinery with rolling-element bearings. These types of bearings will generally transmit both shaft-and bearing-related vibration to the outside of the machine where it can be detected by seismic measurements.
Seismic sensors provide a dynamic AC signal output in mV/g or mV/in/sec. Devices with this type of output are generally intended for connection to a stand-alone vibration monitoring system rather than general automation and control instrumentation like a PLC or DCS. Metrix offers seismic sensors with a wide variety operating temperatures, frequency responses, scale factors, case materials, connector types, mounting options, and hazardous area approvals.
Seismic transmitters provide a 4-20mA DC signal output proportional to the vibration amplitude, and are ideal for applications where a PLC, DCS, or other automation system will be used instead of a stand-alone vibration monitor. Metrix offers seismic transmitters with a wide variety operating temperatures, frequency responses, scale factors, case materials, connector types, mounting options, and hazardous area approvals.
Seismic signal conditioners are designed to accept an input from (and provide power to) a seismic sensor. They convert the signal to a proportional 4-20mA DC signal that can be used as an input to process control instrumentation such as a PLC or DCS. They provide additional convenience features such as optional displays, BNC connectors for access to the dynamic sensor signal, and bandpass filtering. Metrix offers seismic signal conditioners that can accept either acceleration or velocity sensors, and are available with or without an integral display.
Seismic accessories include bushings, mounting adapters, junction boxes, conduit fittings, cable assemblies, and other items used when installing sensors, transmitters, and signal conditioners. These accessories provide environmental protection from dust, moisture, and corrosion, robust mechanical protection from the rigors of industrial use, and facilitate professional installation where wiring can be properly terminated, routed, and labeled.