CSI A6125 Case Piezoelectric Vibration Monitor for CSI 6500 Machinery Health Monitor
The Case Piezoelectric Vibration Monitor is designed for high reliability for your plant’smost critical rotating machinery monitoring case vibration from accelerometer
sensors. This 1-slot monitor is used together with other CSI 6500 monitors to builda complete API 670 machinery protection monitor. Applications include steam, gas,
compressors and hydro turbo machinery.
The main functionality of the Case Peizoelectric Vibration Monitor is to accurately monitor case vibration and reliably protect machinery by comparing vibrationparameters against alarm setpoints, driving alarms and relays. Case piezoelectric vibration sensors, sometimes called case absolute (not to be
confused with shaft absolute), are accelerometers, or velometers, with the output inacceleration or velocity. The case vibration monitor provides vibration monitoring for the bearing case in g’s acceleration or velocity, mm/sec (in/sec). Since the sensor is mounted on the case, the resultant vibration of the case can be influenced by manydifferent sources including rotor movement, foundation and case stiffness, bladevibration, adjacent machines, etc.
When replacing field sensors, many seismic sensors are being replaced withpiezoelectric-type. The 6125 monitor is designed for the newer piezoelectric
style sensors.Case measurements are common in nuclear power applications. Case measurementswith piezoelectric sensors are also common for rolling element bearing machines and
gearboxes. Emerson recommends the piezoelectric sensor and piezoelectric sensormonitor for use when updating both field sensors and monitors.
The CSI 6500 is an integral part of PlantWeb® and AMS Suite. PlantWeb providesoperations integrated machinery health combined with the Ovation® and DeltaV™ process control system. AMS Suite provides maintenance personnel advanced predictive and performance diagnostic tools to confidently and accurately determinemachine 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
· Remote selectable limitmultiply and trip bypass
· Front and rear buffered and proportional outputs, 0/4-20 mA output, 0 – 10 V output
· Self-checking facilities include monitoring hardware, power input,hardware temperature, sensor and cable
· Use with piezoelectric accelerometers and velometer sensors

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