Fail-safe instrument system
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United States of America Patent
Stats
-
Dec 7, 1982
Grant Date -
N/A
app pub date -
Nov 30, 1979
filing date -
Nov 30, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In an instrument system consisting of a transmitter in one location and a receiver in another location connected by a transmission medium, fail-safe operation is obtained by restricting the output of the transmitter to well-defined levels and interpreting any substantial departure of the received signal from these well-defined levels as a failure. When a failure is detected, alarms or other equipment may be activated, including a control circuit which causes replacement of the defective transmitter or transmission medium, thereby restoring the system to service. An embodiment wherein the transmitter is an admittance-responsive transmitter in a two-wire current loop for monitoring the condition of materials is described.
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