Emerson A6410 Dual Channel Valve and Enclosure Expansion Monitor

The Valve and Shell Expansion Monitor is designed to provide high reliability for the plant's most critical rotating machinery.

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

Applications

include steam, gas, compressors and water turbines.

The primary function of the Valve and Case Expansion Monitor is to accurately monitor valve position and case expansion.

The main function of the valve and case expansion monitor is to accurately monitor valve position

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

Valve position is a measurement of the position of the main steam inlet valve stem, usually displayed as a percentage of opening.

The valve position measurement provides the operator with an indication of the current load on the turbine.

Casing expansion monitoring typically consists of two inductive displacement

transducers (or LVDTs) mounted axially, parallel to the shaft, on either side of the turbine casing.

Unlike non-contact eddy current sensors, inductive sensors are contact sensors.

Casing expansion monitoring is important during startup so that the proper expansion rate

can be monitored on both sides of the turbine casing.

Because the turbine can slide on the guide rails as it expands, if neither side is free to expand,

 the turbine will "bend" (housing flex), causing the rotor to collide with the housing.

Channel 1 can be used to measure static values, such as case expansion, as well as dynamic quantities

such as displacement, angle, force, torsion or other physical quantities measured by inductive sensors.

Physical quantities measured by inductive sensors. Channel 2 is used for static

measurements and relative displacements (relative to channel 1).

The AMS 6500 Machinery Health Monitor is an integral part of PlantWeb® and AMS software.

PlantWeb provides integrated machine health operation in conjunction with

the Ovation® and DeltaV™ process control systems.

AMS software provides maintenance personnel with advanced predictive and

performance diagnostic tools to accurately determine machine failures at an early stage.