RK Series™ Three Phase Simplex 4-20mA Control Panel

Three Phase, Simplex 4-20mA Continuous Level Control System for Pump Control and System Monitoring

rk series three phase simplex 4-20mA control panel diagram

The RK Series™ Three Phase Simplex 4-20 mA continuous level sensing panel is designed to control one 208/230/460 VAC three phase pump in water and sewage installations. The protective inner door features panel operating status indicators, LCD display, control buttons and provides access to the pump motor protection switch. Panel is designed for 4-20mA input and 2-float backup control.


  1. NEMA 4X enclosure rated for indoor or outdoor use
    1. Padlockable cover with quarter turn stainless steel set screw and (2) heavy duty latches that can be secured for added safety
    2. Drip shield
    3. Integral mounting flanges
  2. Motor protective switch provides the adjustable overload, branch circuit protection, and pump disconnect
  3. IEC motor contactor controls the pump motor load by switching the electrical lines
  4. Multitap transformer (208/230/460 VAC primary) provides 115 VAC control/alarm voltage
  5. Primary transformer voltage fuses provides transformer short circuit protection
  6. Terminal Strip field wiring of incoming power, backup floats, submersible level transmitter, and pump
  7. Ground lugs
  8. Molded inner door provides access to circuit breakers, and mounting location for indicators, display, and control buttons
    1. Digital 32-character backlit LCD display
    2. Green LEDs indicate control and alarm circuit power
    3. Red LEDs indicate when either control or alarm fuse is blown
    4. Backup Float Status LED indicator (green=low level redundant off, red=high level)
    5. Amber LED indicates backup float control mode activated
    6. Green Pump Run LED indicates when pump is called to rung. Pump Hand/Run button operates the pump manually
    7. Alarm Test/Silence reset button
  9. Red LED indicate high water alarm
  10. 360° red alarm beacon for visual alert
  11. Piezo audible alarm (not shown)
  12. Alarm silence touch pad (not shown)


  • 4-20mA input for continuous level sensing
  • High level backup float input with LED status indicator
  • High level backup float mode provides pump timer control activation
  • Low level redundant off float input with LED status indicator
  • Digital backlit LCD for easy setup and system monitoring
  • Timed dose or demand dose field programmable
  • Flashing red 360° alarm beacon with horn, includes innovative touch to silence pad, touch to test
  • Pump push to run with low level protection when activated manually
  • Includes easy access touch safe fuses
  • Five-year limited warranty on panel
  • Two-year limited warranty on 4-20mA transmitters



  • 208/230/460 VAC 60 Hz 3Ø


  • 12 x 10 x 6 inch (30.5 x 25.4 x 15.2 cm)NEMA 4X ultraviolet stabilized thermoplastic rated for indoor/outdoor use with integral mounting flange, padlockable cover with (2) heavy duty thermoplastic latches, and stainless steel 1/4 turn set screw


  • molded thermoplastic


  • 115 VAC


  • IEC motor protection switch and IEC motor contactor


  • 1-32 Amps


  • 2-16 character lines, backlight


  • 83-85 decibel rating


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