Emerson CSI A6120 Enclosure Seismic Vibration Monitor

CSI A6120 Enclosure Seismic Vibration Monitor for CSI 6500 Machinery Health Monitor

The Case Seismic Vibration Monitor for use with electromechanical seismic sensors is designed for high reliability on the plant's most critical rotating machinery.

This 1-slot monitor is used in conjunction with other CSI 6500 monitors to form a complete API 670 machinery protection monitor.

Applications include steam, gas, compressors and hydraulic turbines. Casing measurements are common in nuclear power applications.

The primary function of the casing seismic vibration monitor is to accurately monitor casing seismic vibration, the

and to reliably protect machinery by comparing vibration parameters with alarm set points, actuated alarms and relays.

A case seismic vibration sensor, sometimes referred to as a case absolute vibration sensor (not to be confused with a shaft absolute vibration sensor), is an electrodynamic, internally spring-loaded, and magnetically actuated vibration sensor.

It is an electrodynamic, internal spring and magnet, velocity output type sensor.

A housing seismic vibration monitor monitors the overall vibration of a bearing housing at millimetres per second (inches per second).

Since the sensor is mounted on the bearing housing, vibration in the housing can be affected by many different sources.

These include rotor motion, foundation and bearing box stiffness, blade vibration, adjacent machinery, etc.

When replacing ffeld sensors, many are being updated to piezoelectric sensors, which provide internal integration from acceleration to velocity.

Piezoelectric sensors are a new type of electronic sensor rather than the older electromechanical type.

Case Seismic Vibration Monitors are backward compatible with electromechanical sensors installed in the ffeld.

The CSI 6500 Machinery Health Monitor is an integral part of PlantWeb® and the AMS Suite.

PlantWeb combines Ovation® and DeltaV™ process control systems to provide operators with an integrated view of machinery health.

The AMS Suite provides maintenance personnel with advanced predictive and performance diagnostic tools to accurately determine machine failures at an early stage.

Features:

Dual-channel, 3U-sized, 1-slot plug-in module that cuts cabinet space requirements in half compared to traditional four-channel 6U cards

API 670-compliant hot-swappable modules

Remotely selectable limit multiplication and trip bypass

Pre- and post-buffered and proportional outputs, 0/4-20 mA outputs, 0 - 10 V outputs

Use with electric (electromechanical) sensors 9266. 9267. or 9268

Sensor Inputs

Number of inputs: two independent channels

Input Type: Electro-mechanical, Differential

Emerson sensor inputs: Part No. 9266. 9267. or 9268

Isolation: Galvanically isolated from power supply

Input resistance: >100 kΩ

Input voltage range: - 5 - +15 VDC

Input frequency range:

Lower cut-off frequency 1 or 5 Hz

Upper cut-off frequency 50 - 2000 Hz adjustable

Measuring range

Range: Continuously adjustable via configuration software

Vrms (metric) = 5 - 100 mm/s (±25 to ±500 µm)

Vrms (Imperial) = 0.197 in/sec to 3.937 in/sec (±0.984 mils to ±19.685 mils)

Frequency range: 10 - 1000 Hz (VDI 2056. DIN 4566. ISO 3945)

Selectable frequency ranges: 5 - 50 Hz, 10 - 50 Hz, 50 - 1000 Hz, or 50 - 1600 Hz

Lift coil current: 0 - 8 mA, adjustable in 40 μA steps

Lift coil current accuracy: ±0.5% of full scale range, ±0.5% of set value

Maximum allowable load: 3.4 kΩ at 2 mA

Minimum dynamic input voltage: 311 mV peak to peak

Maximum dynamic input voltage: 9500 mV peak to peak

Sensor power supply:

Individually buffered sensor power supply

Galvanically isolated from all system voltages and system supply voltages.

Protected against open and short circuits