Wiring and configuring the CLASSIC 800 Series Flow, Level, Interface & Temperature Switch & Transmitter for "Fail-Safe" operation
Kayden CLASSIC 800 Series Thermal Dispersion Flow, Level, Interface & Temperature Switch & Transmitter
The term “Fail-safe” refers to a method of wiring and programming control instrumentation commonly used in hazardous locations / applications such as a chemical plant, gas plant or refinery.
In a “Fail-safe” application the instrument is wired and configured to be “ON” (closed 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.
A common “fail-safe” set up for No Flow Condition, Pump Protection:
Display Panel Indicators:
On steady when Relay 1 is energized
On steady when Relay 2 is energized
Indicates a self-test error or fault condition
Set Point 1
On steady when viewing Set Point 1
Set Point 2
On steady when viewing Set Point 2
Flashing when switch is operating
Flashing when the Start-up Bypass Timer is active
Displays Thermal Signal
The Thermal Signal increases as:
The flow rate increases
The sensor is submerged
The sensor is submerged by the second liquid of greater thermal conductivity
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