Application: Wiring and configuring the Classic 800 Series Flow / Level Switch for "Fail-Safe"
operation.
 
Product used: Kayden 800 Series Flow – Level – Interface – Temperature Switch
 
Description: The term "Fail-safe" refers to a method of wiring and programming control instrumentation
Problem: 
contacts, output(s) supplied by the instrument to the system) during normal system
operations, but "OFF" ( contact(s) open or de-energized, output(s) discontinued) in the
event of a power failure, cable break, self-test failure, or other loss of electrical power.
In a "Fail-safe" application the instrument is wired and configured to be "ON" (closed
commonly used in hazardous locations / applications such as a chemical plant, gas plant or
refinery.