• Integral or remote mount electronics
• On-board microcontroller
• One-touch button calibration
• Built-in “self diagnostics”
• Built-in driven shield/guard
• Universal power supply 115, 230 Volts AC or 24 Volts DC
• Status Indication LED’s
• Adjustable sensitivity
• Adjustable time delay
• Field selectable Fail-Safe modes
• Built-in static suppression
• Explosion proof design
• 3/4” stainless steel N.P.T. and flange mounting

PURPOSE
Delavan’s Captrol 500 is a cost effective Microcontroller Based R.F. Capacitance On/Off Switch used in powder bulk solid and liquid applications.

”ONE-TOUCH” BUTTON CALIBRATION
With the utilization of our Microcontroller and Delavan’s unique Auto-Cal algorithm, calibration is accomplished with a momentary touch of a button. No special tools, complicated procedures or valuable time is needed.

PRINCIPLE OF OPERATION
The Captrol 500 Microcontroller Based Point Level Switch consists of solid state electronics mounted in a cast aluminum explosion proof enclosure. The rugged sensing element utilizes a driven guard designed to eliminate the effects of material build-up or coatings that may cause false signals.

The sensing element’s “active” 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. This change in frequency is compared to a preset value and after amplification the signal is used to actuate a relay