• Universal power supply Accepts 115, 230 Volts AC, or 24 Volts DC
• Built-in "coating rejection" designed to eliminate false signals caused by material build-up/coating
• Field selectable fail-safe modes
• Adjustable time delay
• Built-in status suppression
• Pump control with adjustable set-points over full length of sensing probe
• Status indication LED's
• General purpose and explosion proof design
• 3/4" N.P.T. and flange mounting
• Sensing probe lengths to 250 feet
• Many probe options/materials
• Independent set-point and differential adjustments

PURPOSE
Delavan's Captrol 510 is an Adjustable On/Off R.F. Capacitance Switch with up to 2 independently adjustable non-interacting set points. It may be used in powder bulk solids and liquid applications.

PRINCIPLE OF OPERATION
The Captrol 510 system consists of a solid state "fail-safe" electronics mounted in an explosion proof enclosure and a sensing probe. The probe is energized with a R.F. signal (approx. 2 MHZ). When the process level changes, a change of capacitance occurs resulting in a change in frequency. This change is compared with preset values and after amplification, is used to actuate up to 2 relays. Multi-turn potentiometers are used for set-point and dif­ferential calibration. An important feature of the Captrol 510 is the set-point and differential adjustments are non-interacting and are independent of each other.

PUMP CONTROL
Delavan's two set-point operation off of one relay allows our Captrol 510 to be used as pump control. One set-point turns off a pump and the second set-point (which is adjustable over the entire length of the sensing probe) is used to turn a pump on. Both function with only one relay.