Year
1984
Abstract
With the advent of system concepts to protect against sabotage by an insider, the capability to reliably provide, in a tampersafe way, information on the state of critical valves is gaining more attention. Several different technological types of valve monitors have been developed and have undergone testing in an operational environment. Some typical designs of monitors, which are based on microswitch, photoelectric, balanced magnetic switch, and magnetoresistive sensor techniques, are described, and the test results these monitors recorded are discussed.