A6140 Shaft Absolute Vibration Monitor for AMS 6500 Machinery Health Monitor
The Shaft Absolute Vibration Monitor is designed for high reliability for the plant’s mostcritical rotating machinery.This 1-slot monitor is used together with other AMS 6500 monitors to build a complete API 670 machinery protection monitor. Applications include steam, gas, compressors and hydro turbo machinery. The main functionality of the Shaft Absolute Vibration
monitoring module is to accurately monitor shaft absolute vibration and reliably protect machinery by comparing vibration parameters against alarm setpoints, driving alarms and relays.
The shaft absolute transducer system consists of a relative displacement sensor and acase-mounted vibration sensor located in the same external housing. The displacementsensor is a non-contact sensor measuring shaft position and movement relative to the case, and the case-mounted vibration sensor measures case absolute relative to
free space.
The two sensors are phase compensated for the different units and mathematically subtracted to get absolute displacement of the shaft relative to free space.
Shaft absolute vibration is an important measurement on all sleeve bearing machines for predictive and protection monitoring. Shaft absolute vibration should be selected when the bearing case and the rotor mass are closely matched, as the bearing case may have significant movement during machine operation.
The AMS 6500 is an integral part of PlantWeb® and AMS software. PlantWeb provides operations integrated machinery health combined with the Ovation® and DeltaV™
process control system. AMS software provides maintenance personnel advanced predictive and performance diagnostic tools to confidently and accurately determine machine malfunctions early.

· Two-channel, 3U size, 1-slot plugin module decreases cabinet spacerequirements in half from traditional four-channel 6U size cards
· API 670 compliant,hot swappable module
· Front and rear bufferedand proportional outputs,0/4-20 mA output, 0 – 10V output
·Self-checking facilitiesinclude monitoring hardware,power input, hardware temperature,sensor and cable
· For connecting one displacement sensor and one seismic, or piezoelectric sensor, so that the combined output isshaft absolute relative to free space
· Use with displacement sensor 6422,6423, 6424 and 6425 and driver CON011/91, 021/91, 041/91 and casemounted piezo electric velocity sensor

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