The valve monitoring system is a stand alone unit with network capabilities for integration into a higher level health
management system. The system is designed for aiding in failure predictions of high-geared ball valves and linearly
actuated valves. It performs data tracking and archiving for identifying degraded performance. The data collection
types are: cryogenic cycles, total cycles, inlet temperature, outlet temperature, body temperature, torsional strain, linear
bonnet strain, preload position, total travel, and total directional changes. Events are recorded and time stamped in
accordance with the IRIG B True Time. The monitoring system is designed for use in a Class 1 Division II explosive
environment. The basic configuration consists of several instrumentation sensor units and a base station. The sensor
units are self contained microprocessor controlled and remotely mountable in three by three by two inches. Each unit is
potted in a fire retardant substance without any cavities and limited to low operating power for maintaining safe
operation in a hydrogen environment. The units are temperature monitored to safeguard against operation outside
temperature limitations. Each contains 902-928 MHz band digital transmitters which meet Federal Communication
Commissions requirements and are limited to a 35 foot transmission radius for preserving data security. The base-station
controller correlates related data from the sensor units and generates data event logs on a compact flash memory
module for database uploading. The entries are also broadcast over an Ethernet network. Nitrogen purged National
Electrical Manufactures Association (NEMA) Class 4 Enclosures are used to house the base-station.
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