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1575E Microprocessor Based Boiler Conductivity Controller


Lakewood Instruments [ 1229243 ] Model 1575e Boiler Controller with [ 4 ] output relays. [ SR2 Conductivity Sensor – PLKT 1/2 inch Plumbing Kit ] // Reference: [ 1575-SR2-PK ] (W)



  • Removable power cord and receptacles for simple conduit installations.
  • Scheduled feed, which can use three relays for biocides or other chemicals.
  • Two (2) water meter inputs, two (2) drum switch inputs, conductivity input, a flow switch input, a 4-20 mA output, and a 4-20 mA input are all standard features.
  • The 4-20 mA input can be used with a transmitter for one of the following: remote conductivity, makeup conductivity, pH, ORP, percent, pressure, milliamps, flow rates, or traced chemistry control. This transmitter can be added in the field.
  • Designed with a single circuit board for better reliability and lower cost.
  • Large open shallow enclosure for easy wiring.
  • Ball valve delay feature allows accurate control of motorized ball valves.
  • Heavy-duty stainless steel domed numeric keypad and illuminated graphical display allow for quick and easy programming. Steel domed switches improve the tactile sensing and life expectancy of the keypad.
  • LED indicators for power, alarm and relay status.


  • Easy to program with the Lakewood plain English, intuitive, and user friendly menu interface.
  • Controller can be used in boiler, cooling tower, or condensate applications when used with the appropriate conductivity sensor.
  • Single circuit board design improves reliability.
  • No add-on options. 4-20 mA output and feed schedule clock features are standard.


  • Conductivity range: 50-10,000 μS
  • Conductivity sensor: 2 electrode
  • Conductivity Resolution: ± 10 μS (conductivity <5000 μS) / ±100 μS(conductivity > 5000 μS)
  • Temperature comp.: 500NTC, NONE
  • Accuracy & repeatability: ± 1.0%
  • Deadband/Setpoint: Programmable
  • Auto/Manual outputs: Menu selectable
  • Keypad: 16 tactile push-buttons
  • Display: illuminated 128×64 pixel LCD
  • Drum Switch Inputs: 2 digital contact inputs
  • Water meter inputs (2): Contact head, paddle wheel, or turbine
  • Timers: Max. blowdown time exceeded and relay run time exceeded
  • Output Signal: One 4 – 20 mA, isolated or non-isolated optionally powered output for conductivity
  • Input Signal: One 4-20 mA, non- isolated internally powered input for conductivity
  • Output relays: 4, 3 selectable use, 1 blowdown
  • Relay ratings: 3A each, 10A total
  • Power: 120/240 VAC 50/60 Hz
  • Ambient: 32° – 120°F (0 – 49°C)
  • Enclosure: NEMA 4X, ETL
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