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LMI - DC4000 Conductivity Controller

LMI - DC4000 Conductivity Controller

Features & Specifications:

The DC4000 may be programmed as a bleed and feed cooling tower controller or boiler controller. Standard features include; four feed modes (Feed & Bleed, % of Time, % of Bleed, Flow meter Pulse), intermittent or continuous sampling, uS or PPM display, flow totalizer, and manual test modes. The boiler mode includes a time-trap sampling method that prevents the flashing problems that are so common in boilers. Programming is simple and is accomplished with only three keys. The backlit liquid crystal display and LEDs provide a visual indication of operating conditions and equipment status.


  • Continuous or timed boiler sampling
  • Multiple inhibitor feed modes
  • 0 - 20,000 ìS range
  • Solenoid or motorized valve control
  • Open- / closed-loop system programming
  • 4 - 20 mA output [programmable]
  • Built-in equipment test circuits
  • Backlit LCD display


BLEED or BLOWDOWN of system water by valve control can be based on several set point options:

    • Conductivity set point
    • Hysteresis delay (lower than set point) to avoid valve operation chattering
    • Rising or Falling conductivity trip points

FEED of chemical (inhibitor) can be based on four (4) different methods:

    • FEED at the same time system BLEEDS (lockout timer limits maximum FEED time)
    • FEED time calculated as a percentage of total BLEED time
    • FEED based on a timed cycle (pump is on for a percentage of this timed cycle)
    • FEED based on flow meter input

ALARM indicators and relay outputs are energized based on the following conditions:

    • HIGH conductivity set point is reached
    • LOW conductivity set point is reached
    • NO FLOW condition exists (flow switch must be installed)


  • Probes
  • Flow Switch Assemblies
  • Actuators
  • Extension Cable Assemblies
  • Replacement Parts

Product Information:

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Call Us Toll Free: (800) 370-0439 | Email
Download our Sales Catalog (PDF)