• On board Microcontroller
• Built-in system “Auto-Test”
• Built-in “Self Diagnostics”
• Easy to read 8 character Alpha Numeric LED display
• Removable terminal strip
• 4 independently selectable fail-safe modes
• 4 independently selectable time-delay modes
• Menu driven keypad user interface
• 4 independently adjustable set-points/differential set-points
• 4 set-point status LED’s
• 4 relay status LED’s

FUNCTION
Delavan’s Captrol 514 is a superior integral mount Microcontroller Based R.F. Capacitance “Multi-Point” Level Switch used in liquids and powder bulk solid applications.

PRINCIPLE OF OPERATION
The Captrol 514 Microcontroller Based Multi-Point Level Switch consists of solid state electronics mounted in a cast aluminum explosion proof enclosure. The integral unit utilizes a driven guard designed to eliminate the effects of material build-up or coatings that may cause false signals.

The sensing element section is energized with a R.F. (radio frequency) signal approximately 2mHz. When the process level changes, a change in capacitance occurs resulting in a change in frequency. The change in frequency is compared to each of the previously established user set-points. Depending upon the result of these comparisons, the microcontroller with adjust (on or off) each relay.